Merge pull request #446 from openseadragon/collections

Collections

.gitignore

@@ -2,3 +2,5 @@
 node_modules
 build/
 sftp-config.json
+coverage/
+temp/

Gruntfile.js

@@ -1,3 +1,5 @@
+/* global module */
+
 module.exports = function(grunt) {
 
     // ----------
@@ -5,7 +7,7 @@ module.exports = function(grunt) {
     grunt.loadNpmTasks("grunt-contrib-concat");
     grunt.loadNpmTasks("grunt-contrib-jshint");
     grunt.loadNpmTasks("grunt-contrib-uglify");
-    grunt.loadNpmTasks("grunt-contrib-qunit");
+    grunt.loadNpmTasks("grunt-qunit-istanbul");
     grunt.loadNpmTasks("grunt-contrib-connect");
     grunt.loadNpmTasks("grunt-contrib-watch");
     grunt.loadNpmTasks("grunt-contrib-clean");
@@ -44,11 +46,14 @@ module.exports = function(grunt) {
             "src/referencestrip.js",
             "src/displayrectangle.js",
             "src/spring.js",
-            "src/imageLoader.js",
+            "src/imageloader.js",
             "src/tile.js",
             "src/overlay.js",
             "src/drawer.js",
-            "src/viewport.js"
+            "src/viewport.js",
+            "src/tiledimage.js",
+            "src/tilecache.js",
+            "src/world.js"
         ];
 
     // ----------
@@ -69,6 +74,7 @@ module.exports = function(grunt) {
         clean: {
             build: ["build"],
             package: [packageDir],
+            coverage: ["coverage"],
             release: {
                 src: [releaseRoot],
                 options: {
@@ -134,10 +140,26 @@ module.exports = function(grunt) {
             }
         },
         qunit: {
+            normal: {
+                options: {
+                    urls: [ "http://localhost:8000/test/test.html" ]
+                }
+            },
+            coverage: {
+                options: {
+                    urls: [ "http://localhost:8000/test/coverage.html" ],
+                    coverage: {
+                        src: ['src/*.js'],
+                        htmlReport: 'coverage/html/',
+                        instrumentedFiles: 'temp/',
+                        baseUrl: '.',
+                        disposeCollector: true
+                    }
+                }
+            },
             all: {
                 options: {
-                    timeout: 10000,
-                    urls: [ "http://localhost:8000/test/test.html" ]
+                    timeout: 10000
                 }
             }
         },
@@ -151,7 +173,7 @@ module.exports = function(grunt) {
         },
         watch: {
             files: [ "Gruntfile.js", "src/*.js", "images/*" ],
-            tasks: "build"
+            tasks: "watchTask"
         },
         jshint: {
             options: {
@@ -206,6 +228,8 @@ module.exports = function(grunt) {
     });
 
     // ----------
+    // Bower task.
+    // Generates the Bower file for site-build.
     grunt.registerTask("bower", function() {
         var path = "../site-build/bower.json";
         var data = grunt.file.readJSON(path);
@@ -213,6 +237,18 @@ module.exports = function(grunt) {
         grunt.file.write(path, JSON.stringify(data, null, 2) + "\n");
     });
 
+    // ----------
+    // Watch task.
+    // Called from the watch feature; does a full build or a minbuild, depending on
+    // whether you used --min on the command line.
+    grunt.registerTask("watchTask", function() {
+        if (grunt.option('min')) {
+            grunt.task.run("minbuild");
+        } else {
+            grunt.task.run("build");
+        }
+    });
+
     // ----------
     // Build task.
     // Cleans out the build folder and builds the code and images into it, checking lint.
@@ -221,10 +257,22 @@ module.exports = function(grunt) {
         "uglify", "replace:cleanPaths", "copy:build"
     ]);
 
+    // ----------
+    // Minimal build task.
+    // For use during development as desired. Creates only the unminified version.
+    grunt.registerTask("minbuild", [
+        "git-describe", "concat", "copy:build"
+    ]);
+
     // ----------
     // Test task.
     // Builds and runs unit tests.
-    grunt.registerTask("test", ["build", "connect", "qunit"]);
+    grunt.registerTask("test", ["build", "connect", "qunit:normal"]);
+
+    // ----------
+    // Coverage task.
+    // Outputs unit test code coverage report.
+    grunt.registerTask("coverage", ["clean:coverage", "connect", "qunit:coverage"]);
 
     // ----------
     // Package task.

README.md

@@ -63,6 +63,12 @@ and open `http://localhost:8000/test/test.html` in your browser.
 
 Another good page, if you want to interactively test out your changes, is `http://localhost:8000/test/demo/basic.html`.
 
+You can also get a report of the tests' code coverage:
+
+    grunt coverage
+
+The report shows up at `coverage/html/index.html` viewable in a browser.
+
 ### Contributing
 
 OpenSeadragon is truly a community project; we welcome your involvement!

changelog.txt

@@ -1,6 +1,54 @@
 OPENSEADRAGON CHANGELOG
 =======================
 
+1.3.0: (in progress)
+
+* True multi-image mode (#450)
+    * BREAKING CHANGE: Passing an array for the tileSources option is no longer enough to trigger sequence mode; you have to set the sequenceMode option to true as well
+    * BREAKING CHANGE: Navigator no longer sends an open event when its viewer opens
+    * BREAKING CHANGE: Viewer.drawers and Viewer.drawersContainer no longer exist
+    * BREAKING CHANGE: A Viewer's Drawer and Viewport are now made once per Viewer and reused for every image that Viewer opens (rather than being recreated for every open); this means if you change Viewer options between opens, the behavior is different now.
+    * DEPRECATION: use Viewer.addTiledImage instead of Viewer.addLayer
+        * addTiledImage supports positioning config properties
+    * DEPRECATION: use World.getItemAt instead of Viewer.getLayerAtLevel
+    * DEPRECATION: use World.getIndexOfItem instead of Viewer.getLevelOfLayer
+    * DEPRECATION: use World.getItemCount instead of Viewer.getLayersCount
+    * DEPRECATION: use World.setItemIndex instead of Viewer.setLayerLevel
+    * DEPRECATION: use World.removeItem instead of Viewer.removeLayer
+    * DEPRECATION: use World.needsDraw instead of Drawer.needsUpdate
+    * DEPRECATION: use TileCache.numTilesLoaded instead of Drawer.numTilesLoaded
+    * DEPRECATION: use World.resetItems instead of Drawer.reset
+    * DEPRECATION: use Drawer.clear and World.draw instead of Drawer.update
+    * DEPRECATION: the layersAspectRatioEpsilon option is no longer necessary
+    * DEPRECATION: Viewer's add-layer event is now World's add-item event
+    * DEPRECATION: Viewer's layer-level-changed event is now World's item-index-change event
+    * DEPRECATION: Viewer's remove-layer event is now World's remove-item event
+    * DEPRECATION: Viewer's add-layer-failed event is now add-item-failed
+    * DEPRECATION: TileSourceCollection has been retired in favor of World
+    * DEPRECATION: collectionMode no longer draws outlines or reflections for items
+    * Drawer has been split into three classes:
+        * TiledImage, tile management and positioning for a single tiled image
+        * TileCache, tile caching for all images
+        * Drawer, tile drawing for all images
+    * New class: World, keeps track of multiple images in the scene
+    * Viewer now has world and tileCache properties
+    * Rect and Point now have clone functions
+    * New Viewport method for managing homeBounds as well as constraints: setHomeBounds
+    * Viewport.open supports positioning config properties
+* Margins option to push the home region in from the edges of the Viewer (#505)
+* Rect and Point toString() functions are now consistent: rounding values to nearest hundredth
+* Overlays appear in the DOM immediately on open or addOverlay (#507)
+* imageLoaderLimit now works (#544)
+* Turning off scrollToZoom in gestureSettings now allows scroll events to propagate
+* You can now set a minZoomLevel that's greater than the home zoom level
+* Added union() to OpenSeadragon.Rect
+* Fixed an error in fitBounds if the new and old bounds were extremely close in size
+* Added ajaxWithCredentials option (#543)
+* Added viewport-change event for after the viewport changes but before it's drawn
+* A spring's current value is now updated immediately on reset (#524)
+* Fixed an error in fitBounds that occurred sometimes with immediately = true
+* Added support for HDPI (retina) displays (#583)
+
 1.2.2: (in progress)
 
 * Corrected IIIF tile source to use canonical syntax (#586)

openseadragon.sublime-project

@@ -8,7 +8,8 @@
                 "*.sublime-workspace"
             ],
             "folder_exclude_patterns": [
-                "node_modules"
+                "node_modules",
+                "coverage"
             ]
         }
     ],

package.json

@@ -10,11 +10,11 @@
     "grunt-git-describe": "^2.3.2",
     "grunt-contrib-uglify": "^0.4.0",
     "grunt-contrib-watch": "^0.6.1",
-    "grunt-contrib-qunit": "^0.5.1",
     "grunt-contrib-jshint": "^0.10.0",
     "grunt-contrib-compress": "^0.9.1",
     "grunt-contrib-connect": "^0.7.1",
-    "qunitjs": "^1.14.0"
+    "qunitjs": "^1.14.0",
+    "grunt-qunit-istanbul": "^0.4.5"
   },
   "scripts": {
     "test": "grunt test"

src/imageloader.js

@@ -34,16 +34,7 @@
 
 (function( $ ){
 
-/**
- * @private
- * @class ImageJob
- * @classdesc Handles loading a single image for use in a single {@link OpenSeadragon.Tile}.
- *
- * @memberof OpenSeadragon
- * @param {String} source - URL of image to download.
- * @param {String} crossOriginPolicy - CORS policy to use for downloads
- * @param {Function} callback - Called once image has finished downloading.
- */
+// private class
 function ImageJob ( options ) {
 
     $.extend( true, this, {
@@ -60,11 +51,6 @@ function ImageJob ( options ) {
 }
 
 ImageJob.prototype = {
-
-    /**
-     * Initiates downloading of associated image.
-     * @method
-     */
     start: function(){
         var _this = this;
 
@@ -104,20 +90,24 @@ ImageJob.prototype = {
 };
 
 /**
- * @class
+ * @class ImageLoader
+ * @memberof OpenSeadragon
  * @classdesc Handles downloading of a set of images using asynchronous queue pattern.
+ * You generally won't have to interact with the ImageLoader directly.
+ * @param {Object} options - Options for this ImageLoader.
+ * @param {Number} [options.jobLimit] - The number of concurrent image requests. See imageLoaderLimit in {@link OpenSeadragon.Options} for details.
  */
-$.ImageLoader = function() {
+$.ImageLoader = function( options ) {
 
     $.extend( true, this, {
         jobLimit:       $.DEFAULT_SETTINGS.imageLoaderLimit,
         jobQueue:       [],
         jobsInProgress: 0
-    });
+    }, options );
 
 };
 
-$.ImageLoader.prototype = {
+$.ImageLoader.prototype = /** @lends OpenSeadragon.ImageLoader.prototype */{
 
     /**
      * Add an unloaded image to the loader queue.
@@ -172,10 +162,10 @@ function completeJob( loader, job, callback ) {
     if ( (!loader.jobLimit || loader.jobsInProgress < loader.jobLimit) && loader.jobQueue.length > 0) {
         nextJob = loader.jobQueue.shift();
         nextJob.start();
+        loader.jobsInProgress++;
     }
 
     callback( job.image );
 }
 
 }( OpenSeadragon ));
-

src/navigator.js

@@ -173,7 +173,10 @@ $.Navigator = function( options ){
         options.controlOptions
     );
 
-    if ( options.controlOptions.anchor != $.ControlAnchor.ABSOLUTE && options.controlOptions.anchor != $.ControlAnchor.NONE ) {
+    this._resizeWithViewer = options.controlOptions.anchor != $.ControlAnchor.ABSOLUTE &&
+        options.controlOptions.anchor != $.ControlAnchor.NONE;
+
+    if ( this._resizeWithViewer ) {
         if ( options.width && options.height ) {
             this.element.style.height = typeof ( options.height )  == "number" ? ( options.height + 'px' ) : options.height;
             this.element.style.width  = typeof ( options.width )  == "number" ? ( options.width + 'px' ) : options.width;
@@ -194,8 +197,7 @@ $.Navigator = function( options ){
     this.displayRegionContainer.appendChild(this.displayRegion);
     this.element.getElementsByTagName('div')[0].appendChild(this.displayRegionContainer);
 
-    if (options.navigatorRotate)
-    {
+    if (options.navigatorRotate) {
         options.viewer.addHandler("rotate", function (args) {
             _setTransformRotate(_this.displayRegionContainer, args.degrees);
             _setTransformRotate(_this.displayRegion, -args.degrees);
@@ -213,6 +215,32 @@ $.Navigator = function( options ){
         scrollHandler:   $.delegate( this, onCanvasScroll )
     });
 
+    this.addHandler("reset-size", function() {
+        if (_this.viewport) {
+            _this.viewport.goHome(true);
+        }
+    });
+
+    this.addHandler("reset-size", function() {
+        if (_this.viewport) {
+            _this.viewport.goHome(true);
+        }
+    });
+
+    viewer.world.addHandler("item-index-change", function(event) {
+        var item = _this.world.getItemAt(event.previousIndex);
+        _this.world.setItemIndex(item, event.newIndex);
+    });
+
+    viewer.world.addHandler("remove-item", function(event) {
+        var theirItem = event.item;
+        var myItem = _this._getMatchingItem(theirItem);
+        if (myItem) {
+            _this.world.removeItem(myItem);
+        }
+    });
+
+    this.update(viewer.viewport);
 };
 
 $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /** @lends OpenSeadragon.Navigator.prototype */{
@@ -228,23 +256,13 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
                     (this.container.clientWidth === 0 ? 1 : this.container.clientWidth),
                     (this.container.clientHeight === 0 ? 1 : this.container.clientHeight)
                 );
+
             if ( !containerSize.equals( this.oldContainerSize ) ) {
-                var oldBounds = this.viewport.getBounds();
-                var oldCenter = this.viewport.getCenter();
                 this.viewport.resize( containerSize, true );
-                var imageHeight = 1 / this.source.aspectRatio;
-                var newWidth = oldBounds.width <= 1 ? oldBounds.width : 1;
-                var newHeight = oldBounds.height <= imageHeight ?
-                    oldBounds.height : imageHeight;
-                var newBounds = new $.Rect(
-                    oldCenter.x - ( newWidth / 2.0 ),
-                    oldCenter.y - ( newHeight / 2.0 ),
-                    newWidth,
-                    newHeight
-                    );
-                this.viewport.fitBounds( newBounds, true );
+                this.viewport.goHome(true);
                 this.oldContainerSize = containerSize;
-                this.drawer.update();
+                this.drawer.clear();
+                this.world.draw();
             }
         }
     },
@@ -264,28 +282,36 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
             bottomright;
 
         viewerSize = $.getElementSize( this.viewer.element );
-        if ( !viewerSize.equals( this.oldViewerSize ) ) {
+        if ( this._resizeWithViewer && !viewerSize.equals( this.oldViewerSize ) ) {
             this.oldViewerSize = viewerSize;
-            if ( this.maintainSizeRatio ) {
+
+            if ( this.maintainSizeRatio || !this.elementArea) {
                 newWidth  = viewerSize.x * this.sizeRatio;
                 newHeight = viewerSize.y * this.sizeRatio;
-            }
-            else {
+            } else {
                 newWidth = Math.sqrt(this.elementArea * (viewerSize.x / viewerSize.y));
                 newHeight = this.elementArea / newWidth;
             }
+
             this.element.style.width  = Math.round( newWidth ) + 'px';
             this.element.style.height = Math.round( newHeight ) + 'px';
+
+            if (!this.elementArea) {
+                this.elementArea = newWidth * newHeight;
+            }
+
             this.updateSize();
         }
 
         if( viewport && this.viewport ) {
             bounds      = viewport.getBounds( true );
             topleft     = this.viewport.pixelFromPoint( bounds.getTopLeft(), false );
-            bottomright = this.viewport.pixelFromPoint( bounds.getBottomRight(), false ).minus( this.totalBorderWidths );
+            bottomright = this.viewport.pixelFromPoint( bounds.getBottomRight(), false )
+                .minus( this.totalBorderWidths );
 
             //update style for navigator-box
-            (function(style) {
+            var style = this.displayRegion.style;
+            style.display = this.world.getItemCount() ? 'block' : 'none';
 
             style.top    = Math.round( topleft.y ) + 'px';
             style.left   = Math.round( topleft.x ) + 'px';
@@ -295,24 +321,52 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
             // make sure width and height are non-negative so IE doesn't throw
             style.width  = Math.round( Math.max( width, 0 ) ) + 'px';
             style.height = Math.round( Math.max( height, 0 ) ) + 'px';
-
-            }( this.displayRegion.style ));
         }
 
     },
 
-    open: function( source ) {
-        this.updateSize();
-        var containerSize = this.viewer.viewport.containerSize.times( this.sizeRatio );
-        var ts = source.getTileSize(source.maxLevel);
-        if ( ts > containerSize.x || ts > containerSize.y ) {
-            this.minPixelRatio = Math.min( containerSize.x, containerSize.y ) / ts;
-        } else {
-            this.minPixelRatio = this.viewer.minPixelRatio;
+    // overrides Viewer.addTiledImage
+    addTiledImage: function(options) {
+        var _this = this;
+
+        var original = options.originalTiledImage;
+        delete options.original;
+
+        var optionsClone = $.extend({}, options, {
+            success: function(event) {
+                var myItem = event.item;
+                myItem._originalForNavigator = original;
+                _this._matchBounds(myItem, original, true);
+
+                original.addHandler('bounds-change', function() {
+                    _this._matchBounds(myItem, original);
+                });
+            }
+        });
+
+        return $.Viewer.prototype.addTiledImage.apply(this, [optionsClone]);
+    },
+
+    // private
+    _getMatchingItem: function(theirItem) {
+        var count = this.world.getItemCount();
+        var item;
+        for (var i = 0; i < count; i++) {
+            item = this.world.getItemAt(i);
+            if (item._originalForNavigator === theirItem) {
+                return item;
             }
-        return $.Viewer.prototype.open.apply( this, [ source ] );
         }
 
+        return null;
+    },
+
+    // private
+    _matchBounds: function(myItem, theirItem, immediately) {
+        var bounds = theirItem.getBounds();
+        myItem.setPosition(bounds.getTopLeft(), immediately);
+        myItem.setWidth(bounds.width, immediately);
+    }
 });
 
 /**

src/openseadragon.js

@@ -126,20 +126,14 @@
   *     The element to append the viewer's container element to. If not provided, the 'id' property must be provided.
   *     If both the element and id properties are specified, the viewer is appended to the element provided in the element property.
   *
+  * @property {Array|String|Function|Object} [tileSources=null]
+  *     Tile source(s) to open initially. This is a complex parameter; see
+  *     {@link OpenSeadragon.Viewer#open} for details.
+  *
   * @property {Number} [tabIndex=0]
   *     Tabbing order index to assign to the viewer element. Positive values are selected in increasing order. When tabIndex is 0
   *     source order is used. A negative value omits the viewer from the tabbing order.
   *
-  * @property {Array|String|Function|Object[]|Array[]|String[]|Function[]} [tileSources=null]
-  *     As an Array, the tileSource can hold either Objects or mixed
-  *     types of Arrays of Objects, Strings, or Functions. When a value is a String,
-  *     the tileSource is used to create a {@link OpenSeadragon.DziTileSource}.
-  *     When a value is a Function, the function is used to create a new
-  *     {@link OpenSeadragon.TileSource} whose abstract method
-  *     getUrl( level, x, y ) is implemented by the function. Finally, when it
-  *     is an Array of objects, it is used to create a
-  *     {@link OpenSeadragon.LegacyTileSource}.
-  *
   * @property {Array} overlays Array of objects defining permanent overlays of
   *     the viewer. The overlays added via this option and later removed with
   *     {@link OpenSeadragon.Viewer#removeOverlay} will be added back when a new
@@ -215,9 +209,6 @@
   * @property {Number} [opacity=1]
   *     Opacity of the drawer (1=opaque, 0=transparent)
   *
-  * @property {Number} [layersAspectRatioEpsilon=0.0001]
-  *     Maximum aspectRatio mismatch between 2 layers.
-  *
   * @property {Number} [degrees=0]
   *     Initial rotation.
   *
@@ -265,10 +256,14 @@
   * @property {Number} [visibilityRatio=0.5]
   *     The percentage ( as a number from 0 to 1 ) of the source image which
   *     must be kept within the viewport.  If the image is dragged beyond that
-  *     limit, it will 'bounce' back until the minimum visibility ration is
+  *     limit, it will 'bounce' back until the minimum visibility ratio is
   *     achieved.  Setting this to 0 and wrapHorizontal ( or wrapVertical ) to
   *     true will provide the effect of an infinitely scrolling viewport.
   *
+  * @property {Object} [viewportMargins={}]
+  *     Pushes the "home" region in from the sides by the specified amounts.
+  *     Possible subproperties (Numbers, in screen coordinates): left, top, right, bottom.
+  *
   * @property {Number} [imageLoaderLimit=0]
   *     The maximum number of image requests to make concurrently.  By default
   *     it is set to 0 allowing the browser to make the maximum number of
@@ -455,8 +450,8 @@
   *     this setting when set to false.
   *
   * @property {Boolean} [showSequenceControl=true]
-  *     If the viewer has been configured with a sequence of tile sources, then
-  *     provide buttons for navigating forward and backward through the images.
+  *     If sequenceMode is true, then provide buttons for navigating forward and
+  *     backward through the images.
   *
   * @property {OpenSeadragon.ControlAnchor} [sequenceControlAnchor=TOP_LEFT]
   *     Placement of the default sequence controls.
@@ -514,26 +509,29 @@
   *     To only change the button images, consider using
   *     {@link OpenSeadragon.Options.navImages}
   *
+  * @property {Boolean} [sequenceMode=false]
+  *     Set to true to have the viewer treat your tilesources as a sequence of images to
+  *     be opened one at a time rather than all at once.
+  *
   * @property {Number} [initialPage=0]
-  *     If the viewer has been configured with a sequence of tile sources, display this page initially.
+  *     If sequenceMode is true, display this page initially.
   *
   * @property {Boolean} [preserveViewport=false]
-  *     If the viewer has been configured with a sequence of tile sources, then
-  *     normally navigating through each image resets the viewport to 'home'
-  *     position.  If preserveViewport is set to true, then the viewport position
-  *     is preserved when navigating between images in the sequence.
+  *     If sequenceMode is true, then normally navigating to through each image resets the
+  *     viewport to 'home' position.  If preserveViewport is set to true, then the viewport
+  *     position is preserved when navigating between images in the sequence.
   *
   * @property {Boolean} [preserveOverlays=false]
-  *     If the viewer has been configured with a sequence of tile sources, then
-  *     normally navigating through each image resets the overlays.
+  *     If sequenceMode is true, then normally navigating to through each image
+  *     resets the overlays.
   *     If preserveOverlays is set to true, then the overlays
   *     are preserved when navigating between images in the sequence.
   *     Note: setting preserveOverlays overrides any overlays specified in the
   *     "overlays" property.
   *
   * @property {Boolean} [showReferenceStrip=false]
-  *     If the viewer has been configured with a sequence of tile sources, then
-  *     display a scrolling strip of image thumbnails for navigating through the images.
+  *     If sequenceMode is true, then display a scrolling strip of image thumbnails for
+  *     navigating through the images.
   *
   * @property {String} [referenceStripScroll='horizontal']
   *
@@ -548,17 +546,30 @@
   * @property {Number} [referenceStripSizeRatio=0.2]
   *
   * @property {Boolean} [collectionMode=false]
+  *     Set to true to have the viewer arrange your TiledImages in a grid or line.
   *
   * @property {Number} [collectionRows=3]
+  *     If collectionMode is true, specifies how many rows the grid should have. Use 1 to make a line.
+  *     If collectionLayout is 'vertical', specifies how many columns instead.
   *
   * @property {String} [collectionLayout='horizontal']
+  *     If collectionMode is true, specifies whether to arrange vertically or horizontally.
   *
   * @property {Number} [collectionTileSize=800]
+  *     If collectionMode is true, specifies the size, in viewport coordinates, for each TiledImage to fit into.
+  *     The TiledImage will be centered within a square of the specified size.
+  *
+  * @property {Number} [collectionTileMargin=80]
+  *     If collectionMode is true, specifies the margin, in viewport coordinates, between each TiledImage.
   *
   * @property {String|Boolean} [crossOriginPolicy=false]
   *     Valid values are 'Anonymous', 'use-credentials', and false. If false, canvas requests will
   *     not use CORS, and the canvas will be tainted.
   *
+  * @property {Boolean} [ajaxWithCredentials=false]
+  *     Whether to set the withCredentials XHR flag for AJAX requests (when loading tile sources).
+  *     Note that this can be overridden at the {@link OpenSeadragon.TileSource} level.
+  *
   */
 
  /**
@@ -809,6 +820,25 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
                     canvasElement.getContext( '2d' ) );
     }());
 
+    /**
+     * A ratio comparing the device screen's pixel density to the canvas's backing store pixel density. Defaults to 1 if canvas isn't supported by the browser.
+     * @member {Number} pixelDensityRatio
+     * @memberof OpenSeadragon
+     */
+    $.pixelDensityRatio = (function () {
+        if ( $.supportsCanvas ) {
+            var context = document.createElement('canvas').getContext('2d');
+            var devicePixelRatio = window.devicePixelRatio || 1;
+            var backingStoreRatio = context.webkitBackingStorePixelRatio ||
+                                    context.mozBackingStorePixelRatio ||
+                                    context.msBackingStorePixelRatio ||
+                                    context.oBackingStorePixelRatio ||
+                                    context.backingStorePixelRatio || 1;
+            return devicePixelRatio / backingStoreRatio;
+        } else {
+            return 1;
+        }
+    }());
 
 }( OpenSeadragon ));
 
@@ -916,6 +946,7 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
             tileHost:               null,
             initialPage:            0,
             crossOriginPolicy:      false,
+            ajaxWithCredentials:    false,
 
             //PAN AND ZOOM SETTINGS AND CONSTRAINTS
             panHorizontal:          true,
@@ -988,9 +1019,6 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
             // APPEARANCE
             opacity:                1,
 
-            // LAYERS SETTINGS
-            layersAspectRatioEpsilon:   0.0001,
-
             //REFERENCE STRIP SETTINGS
             showReferenceStrip:          false,
             referenceStripScroll:       'horizontal',
@@ -1005,6 +1033,7 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
             collectionLayout:       'horizontal', //vertical
             collectionMode:         false,
             collectionTileSize:     800,
+            collectionTileMargin:   80,
 
             //PERFORMANCE SETTINGS
             imageLoaderLimit:       0,
@@ -1924,13 +1953,25 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
 
         /**
          * Makes an AJAX request.
-         * @function
-         * @param {String} url - the url to request
-         * @param {Function} onSuccess - a function to call on a successful response
-         * @param {Function} onError - a function to call on when an error occurs
+         * @param {Object} options
+         * @param {String} options.url - the url to request
+         * @param {Function} options.success - a function to call on a successful response
+         * @param {Function} options.error - a function to call on when an error occurs
+         * @param {Boolean} [options.withCredentials=false] - whether to set the XHR's withCredentials
          * @throws {Error}
          */
         makeAjaxRequest: function( url, onSuccess, onError ) {
+            var withCredentials;
+
+            // Note that our preferred API is that you pass in a single object; the named
+            // arguments are for legacy support.
+            if( $.isPlainObject( url ) ){
+                onSuccess = url.success;
+                onError = url.error;
+                withCredentials = url.withCredentials;
+                url = url.url;
+            }
+
             var protocol = $.getUrlProtocol( url );
             var request = $.createAjaxRequest( protocol === "file:" );
 
@@ -1957,6 +1998,10 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
                 }
             };
 
+            if (withCredentials) {
+                request.withCredentials = true;
+            }
+
             try {
                 request.open( "GET", url, true );
                 request.send( null );
@@ -2271,7 +2316,8 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
         debug:  nullfunction,
         info:   nullfunction,
         warn:   nullfunction,
-        error:  nullfunction
+        error:  nullfunction,
+        assert: nullfunction
     };
 
 

src/point.js

@@ -60,6 +60,13 @@ $.Point = function( x, y ) {
 };
 
 $.Point.prototype = /** @lends OpenSeadragon.Point.prototype */{
+    /**
+     * @function
+     * @returns {OpenSeadragon.Point} a duplicate of this Point
+     */
+    clone: function() {
+        return new $.Point(this.x, this.y);
+    },
 
     /**
      * Add another Point to this point and return a new Point.
@@ -189,7 +196,7 @@ $.Point.prototype = /** @lends OpenSeadragon.Point.prototype */{
      * @returns {String} A string representation of this point.
      */
     toString: function() {
-        return "(" + Math.round(this.x) + "," + Math.round(this.y) + ")";
+        return "(" + (Math.round(this.x * 100) / 100) + "," + (Math.round(this.y * 100) / 100) + ")";
     }
 };
 

src/rectangle.js

@@ -75,6 +75,13 @@ $.Rect = function( x, y, width, height ) {
 };
 
 $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
+    /**
+     * @function
+     * @returns {OpenSeadragon.Rect} a duplicate of this Rect
+     */
+    clone: function() {
+        return new $.Rect(this.x, this.y, this.width, this.height);
+    },
 
     /**
      * The aspect ratio is simply the ratio of width to height.
@@ -194,6 +201,21 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
         );
     },
 
+    /**
+     * Returns the smallest rectangle that will contain this and the given rectangle.
+     * @param {OpenSeadragon.Rect} rect
+     * @return {OpenSeadragon.Rect} The new rectangle.
+     */
+    // ----------
+    union: function(rect) {
+        var left = Math.min(this.x, rect.x);
+        var top = Math.min(this.y, rect.y);
+        var right = Math.max(this.x + this.width, rect.x + rect.width);
+        var bottom = Math.max(this.y + this.height, rect.y + rect.height);
+
+        return new OpenSeadragon.Rect(left, top, right - left, bottom - top);
+    },
+
     /**
      * Rotates a rectangle around a point. Currently only 90, 180, and 270
      * degrees are supported.
@@ -257,10 +279,10 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
      */
     toString: function() {
         return "[" +
-            Math.round(this.x*100) + "," +
-            Math.round(this.y*100) + "," +
-            Math.round(this.width*100) + "x" +
-            Math.round(this.height*100) +
+            (Math.round(this.x*100) / 100) + "," +
+            (Math.round(this.y*100) / 100) + "," +
+            (Math.round(this.width*100) / 100) + "x" +
+            (Math.round(this.height*100) / 100) +
         "]";
     }
 };

src/referencestrip.js

@@ -290,6 +290,13 @@ $.extend( $.ReferenceStrip.prototype, $.EventSource.prototype, $.Viewer.prototyp
             return true;
         }
         return false;
+    },
+
+    // Overrides Viewer.destroy
+    destroy: function() {
+        if (this.element) {
+            this.element.parentNode.removeChild(this.element);
+        }
     }
 
 } );

src/spring.js

@@ -117,10 +117,8 @@ $.Spring.prototype = /** @lends OpenSeadragon.Spring.prototype */{
      * @param {Number} target
      */
     resetTo: function( target ) {
-        this.target.value = target;
-        this.target.time  = this.current.time;
-        this.start.value  = this.target.value;
-        this.start.time   = this.target.time;
+        this.start.value = this.target.value = this.current.value = target;
+        this.start.time = this.target.time = this.current.time = $.now();
     },
 
     /**

src/tile.js

@@ -33,7 +33,7 @@
  */
 
 (function( $ ){
-    var TILE_CACHE       = {};
+
 /**
  * @class Tile
  * @memberof OpenSeadragon
@@ -231,7 +231,8 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
      * Renders the tile in a canvas-based context.
      * @function
      * @param {Canvas} context
-     * @param {Function} method for firing the drawing event. drawingHandler({context, tile, rendered})
+     * @param {Function} drawingHandler - Method for firing the drawing event.
+     * drawingHandler({context, tile, rendered})
      * where <code>rendered</code> is the context with the pre-drawn image.
      */
     drawCanvas: function( context, drawingHandler ) {
@@ -241,16 +242,23 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
             rendered,
             canvas;
 
-        if ( !this.loaded || !( this.image || TILE_CACHE[ this.url ] ) ){
+        if (!this.cacheImageRecord) {
+            $.console.warn('[Tile.drawCanvas] attempting to draw tile %s when it\'s not cached', this.toString());
+            return;
+        }
+
+        rendered = this.cacheImageRecord.getRenderedContext();
+
+        if ( !this.loaded || !( this.image || rendered) ){
             $.console.warn(
                 "Attempting to draw tile %s when it's not yet loaded.",
                 this.toString()
             );
+
             return;
         }
-        context.globalAlpha = this.opacity;
 
-        //context.save();
+        context.globalAlpha = this.opacity;
 
         //if we are supposed to be rendering fully opaque rectangle,
         //ie its done fading or fading is turned off, and if we are drawing
@@ -260,46 +268,40 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
             //clearing only the inside of the rectangle occupied
             //by the png prevents edge flikering
             context.clearRect(
-                position.x+1,
-                position.y+1,
-                size.x-2,
-                size.y-2
+                (position.x * $.pixelDensityRatio)+1,
+                (position.y * $.pixelDensityRatio)+1,
+                (size.x * $.pixelDensityRatio)-2,
+                (size.y * $.pixelDensityRatio)-2
             );
 
         }
 
-        if( !TILE_CACHE[ this.url ] ){
+        if(!rendered){
             canvas = document.createElement( 'canvas' );
             canvas.width = this.image.width;
             canvas.height = this.image.height;
             rendered = canvas.getContext('2d');
             rendered.drawImage( this.image, 0, 0 );
-            TILE_CACHE[ this.url ] = rendered;
+            this.cacheImageRecord.setRenderedContext(rendered);
             //since we are caching the prerendered image on a canvas
             //allow the image to not be held in memory
             this.image = null;
         }
 
-        rendered = TILE_CACHE[ this.url ];
-
         // This gives the application a chance to make image manipulation changes as we are rendering the image
         drawingHandler({context: context, tile: this, rendered: rendered});
 
-        //rendered.save();
         context.drawImage(
             rendered.canvas,
             0,
             0,
             rendered.canvas.width,
             rendered.canvas.height,
-            position.x,
-            position.y,
-            size.x,
-            size.y
+            position.x * $.pixelDensityRatio,
+            position.y * $.pixelDensityRatio,
+            size.x * $.pixelDensityRatio,
+            size.y * $.pixelDensityRatio
         );
-        //rendered.restore();
-
-        //context.restore();
     },
 
     /**
@@ -313,9 +315,6 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
         if ( this.element && this.element.parentNode ) {
             this.element.parentNode.removeChild( this.element );
         }
-        if ( TILE_CACHE[ this.url ]){
-            delete TILE_CACHE[ this.url ];
-        }
 
         this.element    = null;
         this.imgElement = null;

src/tilecache.js

@@ -0,0 +1,238 @@
+/*
+ * OpenSeadragon - TileCache
+ *
+ * Copyright (C) 2009 CodePlex Foundation
+ * Copyright (C) 2010-2013 OpenSeadragon contributors
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of CodePlex Foundation nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+(function( $ ){
+
+// private class
+var TileRecord = function( options ) {
+    $.console.assert( options, "[TileCache.cacheTile] options is required" );
+    $.console.assert( options.tile, "[TileCache.cacheTile] options.tile is required" );
+    $.console.assert( options.tiledImage, "[TileCache.cacheTile] options.tiledImage is required" );
+    this.tile = options.tile;
+    this.tiledImage = options.tiledImage;
+};
+
+// private class
+var ImageRecord = function(options) {
+    $.console.assert( options, "[ImageRecord] options is required" );
+    $.console.assert( options.image, "[ImageRecord] options.image is required" );
+    this._image = options.image;
+    this._tiles = [];
+};
+
+ImageRecord.prototype = {
+    destroy: function() {
+        this._image = null;
+        this._renderedContext = null;
+        this._tiles = null;
+    },
+
+    getImage: function() {
+        return this._image;
+    },
+
+    getRenderedContext: function() {
+        return this._renderedContext;
+    },
+
+    setRenderedContext: function(renderedContext) {
+        this._renderedContext = renderedContext;
+    },
+
+    addTile: function(tile) {
+        $.console.assert(tile, '[ImageRecord.addTile] tile is required');
+        this._tiles.push(tile);
+    },
+
+    removeTile: function(tile) {
+        for (var i = 0; i < this._tiles.length; i++) {
+            if (this._tiles[i] === tile) {
+                this._tiles.splice(i, 1);
+                return;
+            }
+        }
+
+        $.console.warn('[ImageRecord.removeTile] trying to remove unknown tile', tile);
+    },
+
+    getTileCount: function() {
+        return this._tiles.length;
+    }
+};
+
+/**
+ * @class TileCache
+ * @memberof OpenSeadragon
+ * @classdesc Stores all the tiles displayed in a {@link OpenSeadragon.Viewer}.
+ * You generally won't have to interact with the TileCache directly.
+ * @param {Object} options - Configuration for this TileCache.
+ * @param {Number} [options.maxImageCacheCount] - See maxImageCacheCount in
+ * {@link OpenSeadragon.Options} for details.
+ */
+$.TileCache = function( options ) {
+    options = options || {};
+
+    this._maxImageCacheCount = options.maxImageCacheCount || $.DEFAULT_SETTINGS.maxImageCacheCount;
+    this._tilesLoaded = [];
+    this._imagesLoaded = [];
+    this._imagesLoadedCount = 0;
+};
+
+$.TileCache.prototype = /** @lends OpenSeadragon.TileCache.prototype */{
+    /**
+     * @returns {Number} The total number of tiles that have been loaded by
+     * this TileCache.
+     */
+    numTilesLoaded: function() {
+        return this._tilesLoaded.length;
+    },
+
+    /**
+     * Caches the specified tile, removing an old tile if necessary to stay under the
+     * maxImageCacheCount specified on construction. Note that if multiple tiles reference
+     * the same image, there may be more tiles than maxImageCacheCount; the goal is to keep
+     * the number of images below that number. Note, as well, that even the number of images
+     * may temporarily surpass that number, but should eventually come back down to the max specified.
+     * @param {Object} options - Tile info.
+     * @param {OpenSeadragon.Tile} options.tile - The tile to cache.
+     * @param {OpenSeadragon.TiledImage} options.tiledImage - The TiledImage that owns that tile.
+     * @param {Number} [options.cutoff=0] - If adding this tile goes over the cache max count, this
+     * function will release an old tile. The cutoff option specifies a tile level at or below which
+     * tiles will not be released.
+     */
+    cacheTile: function( options ) {
+        $.console.assert( options, "[TileCache.cacheTile] options is required" );
+        $.console.assert( options.tile, "[TileCache.cacheTile] options.tile is required" );
+        $.console.assert( options.tile.url, "[TileCache.cacheTile] options.tile.url is required" );
+        $.console.assert( options.tile.image, "[TileCache.cacheTile] options.tile.image is required" );
+        $.console.assert( options.tiledImage, "[TileCache.cacheTile] options.tiledImage is required" );
+
+        var cutoff = options.cutoff || 0;
+        var insertionIndex = this._tilesLoaded.length;
+
+        var imageRecord = this._imagesLoaded[options.tile.url];
+        if (!imageRecord) {
+            imageRecord = this._imagesLoaded[options.tile.url] = new ImageRecord({
+                image: options.tile.image
+            });
+
+            this._imagesLoadedCount++;
+        }
+
+        imageRecord.addTile(options.tile);
+        options.tile.cacheImageRecord = imageRecord;
+
+        // Note that just because we're unloading a tile doesn't necessarily mean
+        // we're unloading an image. With repeated calls it should sort itself out, though.
+        if ( this._imagesLoadedCount > this._maxImageCacheCount ) {
+            var worstTile       = null;
+            var worstTileIndex  = -1;
+            var prevTile, worstTime, worstLevel, prevTime, prevLevel, prevTileRecord;
+
+            for ( var i = this._tilesLoaded.length - 1; i >= 0; i-- ) {
+                prevTileRecord = this._tilesLoaded[ i ];
+                prevTile = prevTileRecord.tile;
+
+                if ( prevTile.level <= cutoff || prevTile.beingDrawn ) {
+                    continue;
+                } else if ( !worstTile ) {
+                    worstTile       = prevTile;
+                    worstTileIndex  = i;
+                    continue;
+                }
+
+                prevTime    = prevTile.lastTouchTime;
+                worstTime   = worstTile.lastTouchTime;
+                prevLevel   = prevTile.level;
+                worstLevel  = worstTile.level;
+
+                if ( prevTime < worstTime ||
+                   ( prevTime == worstTime && prevLevel > worstLevel ) ) {
+                    worstTile       = prevTile;
+                    worstTileIndex  = i;
+                }
+            }
+
+            if ( worstTile && worstTileIndex >= 0 ) {
+                this._unloadTile(worstTile);
+                insertionIndex = worstTileIndex;
+            }
+        }
+
+        this._tilesLoaded[ insertionIndex ] = new TileRecord({
+            tile: options.tile,
+            tiledImage: options.tiledImage
+        });
+    },
+
+    /**
+     * Clears all tiles associated with the specified tiledImage.
+     * @param {OpenSeadragon.TiledImage} tiledImage
+     */
+    clearTilesFor: function( tiledImage ) {
+        $.console.assert(tiledImage, '[TileCache.clearTilesFor] tiledImage is required');
+        var tileRecord;
+        for ( var i = 0; i < this._tilesLoaded.length; ++i ) {
+            tileRecord = this._tilesLoaded[ i ];
+            if ( tileRecord.tiledImage === tiledImage ) {
+                this._unloadTile(tileRecord.tile);
+                this._tilesLoaded.splice( i, 1 );
+                i--;
+            }
+        }
+    },
+
+    // private
+    getImageRecord: function(url) {
+        $.console.assert(url, '[TileCache.getImageRecord] url is required');
+        return this._imagesLoaded[url];
+    },
+
+    // private
+    _unloadTile: function(tile) {
+        $.console.assert(tile, '[TileCache._unloadTile] tile is required');
+        tile.unload();
+        tile.cacheImageRecord = null;
+
+        var imageRecord = this._imagesLoaded[tile.url];
+        imageRecord.removeTile(tile);
+        if (!imageRecord.getTileCount()) {
+            imageRecord.destroy();
+            delete this._imagesLoaded[tile.url];
+            this._imagesLoadedCount--;
+        }
+    }
+};
+
+}( OpenSeadragon ));

src/tilesource.js

@@ -38,44 +38,52 @@
 /**
  * @class TileSource
  * @classdesc The TileSource contains the most basic implementation required to create a
- * smooth transition between layer in an image pyramid. It has only a single key
- * interface that must be implemented to complete it key functionality:
+ * smooth transition between layers in an image pyramid. It has only a single key
+ * interface that must be implemented to complete its key functionality:
  * 'getTileUrl'.  It also has several optional interfaces that can be
  * implemented if a new TileSource wishes to support configuration via a simple
  * object or array ('configure') and if the tile source supports or requires
- * configuration via retreival of a document on the network ala AJAX or JSONP,
+ * configuration via retrieval of a document on the network ala AJAX or JSONP,
  * ('getImageInfo').
  * <br/>
- * By default the image pyramid is split into N layers where the images longest
+ * By default the image pyramid is split into N layers where the image's longest
  * side in M (in pixels), where N is the smallest integer which satisfies
  *      <strong>2^(N+1) >= M</strong>.
  *
  * @memberof OpenSeadragon
  * @extends OpenSeadragon.EventSource
- * @param {Number|Object|Array|String} width
- *      If more than a single argument is supplied, the traditional use of
- *      positional parameters is supplied and width is expected to be the width
- *      source image at its max resolution in pixels.  If a single argument is supplied and
- *      it is an Object or Array, the construction is assumed to occur through
- *      the extending classes implementation of 'configure'.  Finally if only a
- *      single argument is supplied and it is a String, the extending class is
- *      expected to implement 'getImageInfo' and 'configure'.
- * @param {Number} height
+ * @param {Object} options
+ *      You can either specify a URL, or literally define the TileSource (by specifying
+ *      width, height, tileSize, tileOverlap, minLevel, and maxLevel). For the former,
+ *      the extending class is expected to implement 'getImageInfo' and 'configure'.
+ *      For the latter, the construction is assumed to occur through
+ *      the extending classes implementation of 'configure'.
+ * @param {String} [options.url]
+ *      The URL for the data necessary for this TileSource.
+ * @param {Function} [options.success]
+ *      A function to be called upon successful creation.
+ * @param {Boolean} [options.ajaxWithCredentials]
+ *      If this TileSource needs to make an AJAX call, this specifies whether to set
+ *      the XHR's withCredentials (for accessing secure data).
+ * @param {Number} [options.width]
  *      Width of the source image at max resolution in pixels.
- * @param {Number} tileSize
+ * @param {Number} [options.height]
+ *      Height of the source image at max resolution in pixels.
+ * @param {Number} [options.tileSize]
  *      The size of the tiles to assumed to make up each pyramid layer in pixels.
  *      Tile size determines the point at which the image pyramid must be
  *      divided into a matrix of smaller images.
- * @param {Number} tileOverlap
+ * @param {Number} [options.tileOverlap]
  *      The number of pixels each tile is expected to overlap touching tiles.
- * @param {Number} minLevel
+ * @param {Number} [options.minLevel]
  *      The minimum level to attempt to load.
- * @param {Number} maxLevel
+ * @param {Number} [options.maxLevel]
  *      The maximum level to attempt to load.
  */
 $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLevel ) {
-    var callback = null,
-        args = arguments,
+    var _this = this;
+
+    var args = arguments,
         options,
         i;
 
@@ -102,18 +110,22 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
     //source
     $.extend( true, this, options );
 
+    if (!this.success) {
         //Any functions that are passed as arguments are bound to the ready callback
-    /*jshint loopfunc:true*/
         for ( i = 0; i < arguments.length; i++ ) {
             if ( $.isFunction( arguments[ i ] ) ) {
-            callback = arguments[ i ];
-            this.addHandler( 'ready', function ( event ) {
-                callback( event );
-            } );
+                this.success = arguments[ i ];
                 //only one callback per constructor
                 break;
             }
         }
+    }
+
+    if (this.success) {
+        this.addHandler( 'ready', function ( event ) {
+            _this.success( event );
+        } );
+    }
 
     /**
      * Ratio of width to height
@@ -154,6 +166,10 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
      */
 
     if( 'string' == $.type( arguments[ 0 ] ) ){
+        this.url = arguments[0];
+    }
+
+    if (this.url) {
         //in case the getImageInfo method is overriden and/or implies an
         //async mechanism set some safe defaults first
         this.aspectRatio = 1;
@@ -165,7 +181,7 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
         this.ready       = false;
         //configuration via url implies the extending class
         //implements and 'configure'
-        this.getImageInfo( arguments[ 0 ] );
+        this.getImageInfo( this.url );
 
     } else {
 
@@ -185,8 +201,8 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
                     Math.log( 2 )
                 ) : 0
             );
-        if( callback && $.isFunction( callback ) ){
-            callback( this );
+        if( this.success && $.isFunction( this.success ) ){
+            this.success( this );
         }
     }
 
@@ -355,6 +371,10 @@ $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
             }
 
             options = $TileSource.prototype.configure.apply( _this, [ data, url ]);
+            if (options.ajaxWithCredentials === undefined) {
+                options.ajaxWithCredentials = _this.ajaxWithCredentials;
+            }
+
             readySource = new $TileSource( options );
             _this.ready = true;
             /**
@@ -383,10 +403,14 @@ $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
             });
         } else {
             // request info via xhr asynchronously.
-            $.makeAjaxRequest( url, function( xhr ) {
+            $.makeAjaxRequest( {
+                url: url,
+                withCredentials: this.ajaxWithCredentials,
+                success: function( xhr ) {
                     var data = processResponse( xhr );
                     callback( data );
-            }, function ( xhr, exc ) {
+                },
+                error: function ( xhr, exc ) {
                     var msg;
 
                     /*
@@ -422,6 +446,7 @@ $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
                         message: msg,
                         source: url
                     });
+                }
             });
         }
 

src/tilesourcecollection.js

@@ -34,110 +34,9 @@
 
 (function( $ ){
 
-/**
- * @class TileSourceCollection
- * @memberof OpenSeadragon
- * @extends OpenSeadragon.TileSource
- */
+// deprecated
 $.TileSourceCollection = function( tileSize, tileSources, rows, layout  ) {
-    var options;
-
-    if( $.isPlainObject( tileSize ) ){
-        options = tileSize;
-    }else{
-        options = {
-            tileSize: arguments[ 0 ],
-            tileSources: arguments[ 1 ],
-            rows: arguments[ 2 ],
-            layout: arguments[ 3 ]
+    $.console.error('TileSourceCollection is deprecated; use World instead');
 };
-    }
-
-    if( !options.layout ){
-        options.layout = 'horizontal';
-    }
-
-    var minLevel = 0,
-        levelSize = 1.0,
-        tilesPerRow = Math.ceil( options.tileSources.length / options.rows ),
-        longSide = tilesPerRow >= options.rows ?
-            tilesPerRow :
-            options.rows;
-
-    if( 'horizontal' == options.layout ){
-        options.width = ( options.tileSize ) * tilesPerRow;
-        options.height = ( options.tileSize ) * options.rows;
-    } else {
-        options.height = ( options.tileSize ) * tilesPerRow;
-        options.width = ( options.tileSize ) * options.rows;
-    }
-
-    options.tileOverlap = -options.tileMargin;
-    options.tilesPerRow = tilesPerRow;
-
-    //Set min level to avoid loading sublevels since collection is a
-    //different kind of abstraction
-
-    while( levelSize  <  ( options.tileSize ) * longSide ){
-        //$.console.log( '%s levelSize %s minLevel %s', options.tileSize * longSide, levelSize, minLevel );
-        levelSize = levelSize * 2.0;
-        minLevel++;
-    }
-    options.minLevel = minLevel;
-
-    //for( var name in options ){
-    //    $.console.log( 'Collection %s %s', name, options[ name ] );
-    //}
-
-    $.TileSource.apply( this, [ options ] );
-
-};
-
-$.extend( $.TileSourceCollection.prototype, $.TileSource.prototype, /** @lends OpenSeadragon.TileSourceCollection.prototype */{
-
-    /**
-     * @function
-     * @param {Number} level
-     * @param {Number} x
-     * @param {Number} y
-     */
-    getTileBounds: function( level, x, y ) {
-        var dimensionsScaled = this.dimensions.times( this.getLevelScale( level ) ),
-            px = this.tileSize * x - this.tileOverlap,
-            py = this.tileSize * y - this.tileOverlap,
-            sx = this.tileSize + 1 * this.tileOverlap,
-            sy = this.tileSize + 1 * this.tileOverlap,
-            scale = 1.0 / dimensionsScaled.x;
-
-        sx = Math.min( sx, dimensionsScaled.x - px );
-        sy = Math.min( sy, dimensionsScaled.y - py );
-
-        return new $.Rect( px * scale, py * scale, sx * scale, sy * scale );
-    },
-
-    /**
-     *
-     * @function
-     */
-    configure: function( data, url ){
-        return;
-    },
-
-
-    /**
-     * @function
-     * @param {Number} level
-     * @param {Number} x
-     * @param {Number} y
-     */
-    getTileUrl: function( level, x, y ) {
-        //$.console.log([  level, '/', x, '_', y ].join( '' ));
-        return null;
-    }
-
-
-
-});
-
 
 }( OpenSeadragon ));

src/viewport.js

@@ -37,10 +37,23 @@
 
 /**
  * @class Viewport
- * @classdesc Handles coordinate-related functionality (zoom, pan, rotation, etc.) for an {@link OpenSeadragon.Viewer}.
- * A new instance is created for each TileSource opened (see {@link OpenSeadragon.Viewer#viewport}).
- *
  * @memberof OpenSeadragon
+ * @classdesc Handles coordinate-related functionality (zoom, pan, rotation, etc.)
+ * for an {@link OpenSeadragon.Viewer}.
+ * @param {Object} options - Options for this Viewport.
+ * @param {Object} [options.margins] - See viewportMargins in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.springStiffness] - See springStiffness in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.animationTime] - See animationTime in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.minZoomImageRatio] - See minZoomImageRatio in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.maxZoomPixelRatio] - See maxZoomPixelRatio in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.visibilityRatio] - See visibilityRatio in {@link OpenSeadragon.Options}.
+ * @param {Boolean} [options.wrapHorizontal] - See wrapHorizontal in {@link OpenSeadragon.Options}.
+ * @param {Boolean} [options.wrapVertical] - See wrapVertical in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.defaultZoomLevel] - See defaultZoomLevel in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.minZoomLevel] - See minZoomLevel in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.maxZoomLevel] - See maxZoomLevel in {@link OpenSeadragon.Options}.
+ * @param {Number} [options.degrees] - See degrees in {@link OpenSeadragon.Options}.
+ * @param {Boolean} [options.homeFillsViewer] - See homeFillsViewer in {@link OpenSeadragon.Options}.
  */
 $.Viewport = function( options ) {
 
@@ -63,6 +76,15 @@ $.Viewport = function( options ) {
         delete options.config;
     }
 
+    this._margins = $.extend({
+        left: 0,
+        top: 0,
+        right: 0,
+        bottom: 0
+    }, options.margins || {});
+
+    delete options.margins;
+
     $.extend( true, this, {
 
         //required settings
@@ -89,6 +111,11 @@ $.Viewport = function( options ) {
 
     }, options );
 
+    this._containerInnerSize = new $.Point(
+        Math.max(1, this.containerSize.x - (this._margins.left + this._margins.right)),
+        Math.max(1, this.containerSize.y - (this._margins.top + this._margins.bottom))
+    );
+
     this.centerSpringX = new $.Spring({
         initial: 0,
         springStiffness: this.springStiffness,
@@ -105,44 +132,77 @@ $.Viewport = function( options ) {
         animationTime:   this.animationTime
     });
 
+    this._oldCenterX = this.centerSpringX.current.value;
+    this._oldCenterY = this.centerSpringY.current.value;
+    this._oldZoom    = this.zoomSpring.current.value;
+
+    if (this.contentSize) {
         this.resetContentSize( this.contentSize );
+    } else {
+        this.setHomeBounds(new $.Rect(0, 0, 1, 1), 1);
+    }
+
     this.goHome( true );
     this.update();
 };
 
 $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
-
     /**
+     * Updates the viewport's home bounds and constraints for the given content size.
      * @function
+     * @param {OpenSeadragon.Point} contentSize - size of the content in content units
      * @return {OpenSeadragon.Viewport} Chainable.
      * @fires OpenSeadragon.Viewer.event:reset-size
      */
     resetContentSize: function( contentSize ){
-        this.contentSize    = contentSize;
+        $.console.assert(contentSize, "[Viewport.resetContentSize] contentSize is required");
+        $.console.assert(contentSize instanceof $.Point, "[Viewport.resetContentSize] contentSize must be an OpenSeadragon.Point");
+        $.console.assert(contentSize.x > 0, "[Viewport.resetContentSize] contentSize.x must be greater than 0");
+        $.console.assert(contentSize.y > 0, "[Viewport.resetContentSize] contentSize.y must be greater than 0");
+
+        this.setHomeBounds(new $.Rect(0, 0, 1, contentSize.y / contentSize.x), contentSize.x);
+        return this;
+    },
+
+    /**
+     * Updates the viewport's home bounds and constraints.
+     * @function
+     * @param {OpenSeadragon.Rect} bounds - the new bounds in viewport coordinates
+     * @param {Number} contentFactor - how many content units per viewport unit
+     * @fires OpenSeadragon.Viewer.event:reset-size
+     */
+    setHomeBounds: function(bounds, contentFactor) {
+        $.console.assert(bounds, "[Viewport.setHomeBounds] bounds is required");
+        $.console.assert(bounds instanceof $.Rect, "[Viewport.setHomeBounds] bounds must be an OpenSeadragon.Rect");
+        $.console.assert(bounds.width > 0, "[Viewport.setHomeBounds] bounds.width must be greater than 0");
+        $.console.assert(bounds.height > 0, "[Viewport.setHomeBounds] bounds.height must be greater than 0");
+
+        this.homeBounds = bounds.clone();
+        this.contentSize = this.homeBounds.getSize().times(contentFactor);
         this.contentAspectX = this.contentSize.x / this.contentSize.y;
         this.contentAspectY = this.contentSize.y / this.contentSize.x;
-        this.fitWidthBounds = new $.Rect( 0, 0, 1, this.contentAspectY );
-        this.fitHeightBounds = new $.Rect( 0, 0, this.contentAspectY, this.contentAspectY);
-
-        this.homeBounds = new $.Rect( 0, 0, 1, this.contentAspectY );
 
         if( this.viewer ){
             /**
-             * Raised when the viewer's content size is reset (see {@link OpenSeadragon.Viewport#resetContentSize}).
+             * Raised when the viewer's content size or home bounds are reset
+             * (see {@link OpenSeadragon.Viewport#resetContentSize},
+             * {@link OpenSeadragon.Viewport#setHomeBounds}).
              *
              * @event reset-size
              * @memberof OpenSeadragon.Viewer
              * @type {object}
              * @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised this event.
              * @property {OpenSeadragon.Point} contentSize
+             * @property {OpenSeadragon.Rect} homeBounds
+             * @property {Number} contentFactor
              * @property {?Object} userData - Arbitrary subscriber-defined object.
              */
             this.viewer.raiseEvent( 'reset-size', {
-                contentSize: contentSize
+                contentSize: this.contentSize.clone(),
+                contentFactor: contentFactor,
+                homeBounds: this.homeBounds.clone()
             });
         }
-
-        return this;
     },
 
     /**
@@ -155,15 +215,18 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             var aspectFactor =
                 this.contentAspectX / this.getAspectRatio();
 
+            var output;
             if( this.homeFillsViewer ){ // fill the viewer and clip the image
-                return ( aspectFactor >= 1) ?
+                output = ( aspectFactor >= 1) ?
                     aspectFactor :
                     1;
             } else {
-                return ( aspectFactor >= 1 ) ?
+                output = ( aspectFactor >= 1 ) ?
                     1 :
                     aspectFactor;
             }
+
+            return output / this.homeBounds.width;
         }
     },
 
@@ -216,16 +279,18 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             this.minZoomLevel :
                 this.minZoomImageRatio * homeZoom;
 
-        return Math.min( zoom, homeZoom );
+        return zoom;
     },
 
     /**
      * @function
      */
     getMaxZoom: function() {
-        var zoom = this.maxZoomLevel ?
-            this.maxZoomLevel :
-                ( this.contentSize.x * this.maxZoomPixelRatio / this.containerSize.x );
+        var zoom = this.maxZoomLevel;
+        if (!zoom) {
+            zoom = this.contentSize.x * this.maxZoomPixelRatio / this._containerInnerSize.x;
+            zoom /= this.homeBounds.width;
+        }
 
         return Math.max( zoom, this.getHomeZoom() );
     },
@@ -234,11 +299,12 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * @function
      */
     getAspectRatio: function() {
-        return this.containerSize.x / this.containerSize.y;
+        return this._containerInnerSize.x / this._containerInnerSize.y;
     },
 
     /**
      * @function
+     * @returns {OpenSeadragon.Point} The size of the container, in screen coordinates.
      */
     getContainerSize: function() {
         return new $.Point(
@@ -250,6 +316,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     /**
      * @function
      * @param {Boolean} current - Pass true for the current location; defaults to false (target location).
+     * @returns {OpenSeadragon.Rect} The location you are zoomed/panned to, in viewport coordinates.
      */
     getBounds: function( current ) {
         var center = this.getCenter( current ),
@@ -264,6 +331,22 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
         );
     },
 
+    /**
+     * @function
+     * @param {Boolean} current - Pass true for the current location; defaults to false (target location).
+     * @returns {OpenSeadragon.Rect} The location you are zoomed/panned to,
+     * including the space taken by margins, in viewport coordinates.
+     */
+    getBoundsWithMargins: function( current ) {
+        var bounds = this.getBounds(current);
+        var factor = this._containerInnerSize.x * this.getZoom(current);
+        bounds.x -= this._margins.left / factor;
+        bounds.y -= this._margins.top / factor;
+        bounds.width += (this._margins.left + this._margins.right) / factor;
+        bounds.height += (this._margins.top + this._margins.bottom) / factor;
+        return bounds;
+    },
+
     /**
      * @function
      * @param {Boolean} current - Pass true for the current location; defaults to false (target location).
@@ -304,13 +387,9 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             height
         );
 
-        newZoomPixel    = this.zoomPoint.minus(
-            bounds.getTopLeft()
-        ).times(
-            this.containerSize.x / bounds.width
-        );
+        newZoomPixel = this._pixelFromPoint(this.zoomPoint, bounds);
         deltaZoomPixels = newZoomPixel.minus( oldZoomPixel );
-        deltaZoomPoints = deltaZoomPixels.divide( this.containerSize.x * zoom );
+        deltaZoomPoints = deltaZoomPixels.divide( this._containerInnerSize.x * zoom );
 
         return centerTarget.plus( deltaZoomPoints );
     },
@@ -335,13 +414,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * @return {OpenSeadragon.Rect} constrained bounds.
      */
     _applyBoundaryConstraints: function( bounds, immediately ) {
-        var horizontalThreshold,
-            verticalThreshold,
-            left,
-            right,
-            top,
-            bottom,
-            dx = 0,
+        var dx = 0,
             dy = 0,
             newBounds = new $.Rect(
                 bounds.x,
@@ -350,49 +423,52 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
                 bounds.height
             );
 
-        horizontalThreshold = this.visibilityRatio * newBounds.width;
-        verticalThreshold   = this.visibilityRatio * newBounds.height;
-
-        left   = newBounds.x + newBounds.width;
-        right  = 1 - newBounds.x;
-        top    = newBounds.y + newBounds.height;
-        bottom = this.contentAspectY - newBounds.y;
+        var horizontalThreshold = this.visibilityRatio * newBounds.width;
+        var verticalThreshold   = this.visibilityRatio * newBounds.height;
 
         if ( this.wrapHorizontal ) {
             //do nothing
         } else {
-            if ( left < horizontalThreshold ) {
-                dx = horizontalThreshold - left;
+            var thresholdLeft = newBounds.x + (newBounds.width - horizontalThreshold);
+            if (this.homeBounds.x > thresholdLeft) {
+                dx = this.homeBounds.x - thresholdLeft;
+            }
+
+            var homeRight = this.homeBounds.x + this.homeBounds.width;
+            var thresholdRight = newBounds.x + horizontalThreshold;
+            if (homeRight < thresholdRight) {
+                var newDx = homeRight - thresholdRight;
+                if (dx) {
+                    dx = (dx + newDx) / 2;
+                } else {
+                    dx = newDx;
                 }
-            if ( right < horizontalThreshold ) {
-                dx = dx ?
-                    ( dx + right - horizontalThreshold ) / 2 :
-                    ( right - horizontalThreshold );
             }
         }
 
         if ( this.wrapVertical ) {
             //do nothing
         } else {
-            if ( top < verticalThreshold ) {
-                dy = ( verticalThreshold - top );
+            var thresholdTop = newBounds.y + (newBounds.height - verticalThreshold);
+            if (this.homeBounds.y > thresholdTop) {
+                dy = this.homeBounds.y - thresholdTop;
+            }
+
+            var homeBottom = this.homeBounds.y + this.homeBounds.height;
+            var thresholdBottom = newBounds.y + verticalThreshold;
+            if (homeBottom < thresholdBottom) {
+                var newDy = homeBottom - thresholdBottom;
+                if (dy) {
+                    dy = (dy + newDy) / 2;
+                } else {
+                    dy = newDy;
                 }
-            if ( bottom < verticalThreshold ) {
-                dy =  dy ?
-                    ( dy + bottom - verticalThreshold ) / 2 :
-                    ( bottom - verticalThreshold );
             }
         }
 
-        if ( dx || dy || immediately ) {
+        if ( dx || dy ) {
             newBounds.x += dx;
             newBounds.y += dy;
-            if( newBounds.width > 1  ){
-                newBounds.x = 0.5 - newBounds.width/2;
-            }
-            if( newBounds.height > this.contentAspectY ){
-                newBounds.y = this.contentAspectY/2 - newBounds.height/2;
-            }
         }
 
         if( this.viewer ){
@@ -512,21 +588,28 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             }
 
             newBounds = this._applyBoundaryConstraints( newBounds, immediately );
+            center = newBounds.getCenter();
         }
 
-        if ( newZoom == oldZoom || newBounds.width == oldBounds.width ) {
-            return this.panTo( constraints ? newBounds.getCenter() : center, immediately );
+        if (immediately) {
+            this.panTo( center, true );
+            return this.zoomTo(newZoom, null, true);
+        }
+
+        if (Math.abs(newZoom - oldZoom) < 0.00000000001 ||
+                Math.abs(newBounds.width - oldBounds.width) < 0.00000000001) {
+            return this.panTo( center, immediately );
         }
 
         referencePoint = oldBounds.getTopLeft().times(
-            this.containerSize.x / oldBounds.width
+            this._containerInnerSize.x / oldBounds.width
         ).minus(
             newBounds.getTopLeft().times(
-                this.containerSize.x / newBounds.width
+                this._containerInnerSize.x / newBounds.width
             )
         ).divide(
-            this.containerSize.x / oldBounds.width -
-            this.containerSize.x / newBounds.width
+            this._containerInnerSize.x / oldBounds.width -
+            this._containerInnerSize.x / newBounds.width
         );
 
         return this.zoomTo( newZoom, referencePoint, immediately );
@@ -559,53 +642,27 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     },
 
     /**
-     * @function
+     * Zooms so the image just fills the viewer vertically.
      * @param {Boolean} immediately
      * @return {OpenSeadragon.Viewport} Chainable.
      */
     fitVertically: function( immediately ) {
-        var center = this.getCenter();
+        var box = new $.Rect(this.homeBounds.x + (this.homeBounds.width / 2), this.homeBounds.y,
+            0, this.homeBounds.height);
 
-        if ( this.wrapHorizontal ) {
-            center.x = ( 1 + ( center.x % 1 ) ) % 1;
-            this.centerSpringX.resetTo( center.x );
-            this.centerSpringX.update();
-        }
-
-        if ( this.wrapVertical ) {
-            center.y = (
-                this.contentAspectY + ( center.y % this.contentAspectY )
-            ) % this.contentAspectY;
-            this.centerSpringY.resetTo( center.y );
-            this.centerSpringY.update();
-        }
-
-        return this.fitBounds( this.fitHeightBounds, immediately );
+        return this.fitBounds( box, immediately );
     },
 
     /**
-     * @function
+     * Zooms so the image just fills the viewer horizontally.
      * @param {Boolean} immediately
      * @return {OpenSeadragon.Viewport} Chainable.
      */
     fitHorizontally: function( immediately ) {
-        var center = this.getCenter();
+        var box = new $.Rect(this.homeBounds.x, this.homeBounds.y + (this.homeBounds.height / 2),
+            this.homeBounds.width, 0);
 
-        if ( this.wrapHorizontal ) {
-            center.x = (
-                this.contentAspectX + ( center.x % this.contentAspectX )
-            ) % this.contentAspectX;
-            this.centerSpringX.resetTo( center.x );
-            this.centerSpringX.update();
-        }
-
-        if ( this.wrapVertical ) {
-            center.y = ( 1 + ( center.y % 1 ) ) % 1;
-            this.centerSpringY.resetTo( center.y );
-            this.centerSpringY.update();
-        }
-
-        return this.fitBounds( this.fitWidthBounds, immediately );
+        return this.fitBounds( box, immediately );
     },
 
 
@@ -736,7 +793,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
         /**
          * Raised when rotation has been changed.
          *
-         * @event update-viewport
+         * @event rotate
          * @memberof OpenSeadragon.Viewer
          * @type {object}
          * @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
@@ -769,12 +826,16 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             newBounds = oldBounds,
             widthDeltaFactor;
 
-        this.containerSize = new $.Point(
-            newContainerSize.x,
-            newContainerSize.y
+        this.containerSize.x = newContainerSize.x;
+        this.containerSize.y = newContainerSize.y;
+
+        this._containerInnerSize = new $.Point(
+            Math.max(1, newContainerSize.x - (this._margins.left + this._margins.right)),
+            Math.max(1, newContainerSize.y - (this._margins.top + this._margins.bottom))
         );
 
         if ( maintain ) {
+            // TODO: widthDeltaFactor will always be 1; probably not what's intended
             widthDeltaFactor = newContainerSize.x / this.containerSize.x;
             newBounds.width  = oldBounds.width * widthDeltaFactor;
             newBounds.height = newBounds.width / this.getAspectRatio();
@@ -805,10 +866,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * @function
      */
     update: function() {
-        var oldCenterX = this.centerSpringX.current.value,
-            oldCenterY = this.centerSpringY.current.value,
-            oldZoom    = this.zoomSpring.current.value,
-            oldZoomPixel,
+        var oldZoomPixel,
             newZoomPixel,
             deltaZoomPixels,
             deltaZoomPoints;
@@ -819,7 +877,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
 
         this.zoomSpring.update();
 
-        if (this.zoomPoint && this.zoomSpring.current.value != oldZoom) {
+        if (this.zoomPoint && this.zoomSpring.current.value != this._oldZoom) {
             newZoomPixel    = this.pixelFromPoint( this.zoomPoint, true );
             deltaZoomPixels = newZoomPixel.minus( oldZoomPixel );
             deltaZoomPoints = this.deltaPointsFromPixels( deltaZoomPixels, true );
@@ -833,9 +891,15 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
         this.centerSpringX.update();
         this.centerSpringY.update();
 
-        return this.centerSpringX.current.value != oldCenterX ||
-            this.centerSpringY.current.value != oldCenterY ||
-            this.zoomSpring.current.value != oldZoom;
+        var changed = this.centerSpringX.current.value != this._oldCenterX ||
+            this.centerSpringY.current.value != this._oldCenterY ||
+            this.zoomSpring.current.value != this._oldZoom;
+
+        this._oldCenterX = this.centerSpringX.current.value;
+        this._oldCenterY = this.centerSpringY.current.value;
+        this._oldZoom    = this.zoomSpring.current.value;
+
+        return changed;
     },
 
 
@@ -846,7 +910,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      */
     deltaPixelsFromPoints: function( deltaPoints, current ) {
         return deltaPoints.times(
-            this.containerSize.x * this.getZoom( current )
+            this._containerInnerSize.x * this.getZoom( current )
         );
     },
 
@@ -857,7 +921,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      */
     deltaPointsFromPixels: function( deltaPixels, current ) {
         return deltaPixels.divide(
-            this.containerSize.x * this.getZoom( current )
+            this._containerInnerSize.x * this.getZoom( current )
         );
     },
 
@@ -867,11 +931,17 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * @param {Boolean} current - Pass true for the current location; defaults to false (target location).
      */
     pixelFromPoint: function( point, current ) {
-        var bounds = this.getBounds( current );
+        return this._pixelFromPoint(point, this.getBounds( current ));
+    },
+
+    // private
+    _pixelFromPoint: function( point, bounds ) {
         return point.minus(
             bounds.getTopLeft()
         ).times(
-            this.containerSize.x / bounds.width
+            this._containerInnerSize.x / bounds.width
+        ).plus(
+            new $.Point(this._margins.left, this._margins.top)
         );
     },
 
@@ -882,17 +952,27 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      */
     pointFromPixel: function( pixel, current ) {
         var bounds = this.getBounds( current );
-        return pixel.divide(
-            this.containerSize.x / bounds.width
+        return pixel.minus(
+            new $.Point(this._margins.left, this._margins.top)
+        ).divide(
+            this._containerInnerSize.x / bounds.width
         ).plus(
             bounds.getTopLeft()
         );
     },
 
+    // private
+    _viewportToImageDelta: function( viewerX, viewerY ) {
+        var scale = this.homeBounds.width;
+        return new $.Point(viewerX * (this.contentSize.x / scale),
+            viewerY * ((this.contentSize.y * this.contentAspectX) / scale));
+    },
+
     /**
      * Translates from OpenSeadragon viewer coordinate system to image coordinate system.
      * This method can be called either by passing X,Y coordinates or an
      * OpenSeadragon.Point
+     * Note: not accurate with multi-image; use TiledImage.viewportToImageCoordinates instead.
      * @function
      * @param {OpenSeadragon.Point} viewerX the point in viewport coordinate system.
      * @param {Number} viewerX X coordinate in viewport coordinate system.
@@ -904,13 +984,26 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             //they passed a point instead of individual components
             return this.viewportToImageCoordinates( viewerX.x, viewerX.y );
         }
-        return new $.Point( viewerX * this.contentSize.x, viewerY * this.contentSize.y * this.contentAspectX );
+
+        if (this.viewer && this.viewer.world.getItemCount() > 1) {
+            $.console.error('[Viewport.viewportToImageCoordinates] is not accurate with multi-image; use TiledImage.viewportToImageCoordinates instead.');
+        }
+
+        return this._viewportToImageDelta(viewerX - this.homeBounds.x, viewerY - this.homeBounds.y);
+    },
+
+    // private
+    _imageToViewportDelta: function( imageX, imageY ) {
+        var scale = this.homeBounds.width;
+        return new $.Point((imageX / this.contentSize.x) * scale,
+            (imageY / this.contentSize.y / this.contentAspectX) * scale);
     },
 
     /**
      * Translates from image coordinate system to OpenSeadragon viewer coordinate system
      * This method can be called either by passing X,Y coordinates or an
      * OpenSeadragon.Point
+     * Note: not accurate with multi-image; use TiledImage.imageToViewportCoordinates instead.
      * @function
      * @param {OpenSeadragon.Point} imageX the point in image coordinate system.
      * @param {Number} imageX X coordinate in image coordinate system.
@@ -922,7 +1015,15 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             //they passed a point instead of individual components
             return this.imageToViewportCoordinates( imageX.x, imageX.y );
         }
-        return new $.Point( imageX / this.contentSize.x, imageY / this.contentSize.y / this.contentAspectX );
+
+        if (this.viewer && this.viewer.world.getItemCount() > 1) {
+            $.console.error('[Viewport.imageToViewportCoordinates] is not accurate with multi-image; use TiledImage.imageToViewportCoordinates instead.');
+        }
+
+        var point = this._imageToViewportDelta(imageX, imageY);
+        point.x += this.homeBounds.x;
+        point.y += this.homeBounds.y;
+        return point;
     },
 
     /**
@@ -930,6 +1031,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * pixel coordinates to OpenSeadragon viewport rectangle coordinates.
      * This method can be called either by passing X,Y,width,height or an
      * OpenSeadragon.Rect
+     * Note: not accurate with multi-image; use TiledImage.imageToViewportRectangle instead.
      * @function
      * @param {OpenSeadragon.Rect} imageX the rectangle in image coordinate system.
      * @param {Number} imageX the X coordinate of the top left corner of the rectangle
@@ -950,10 +1052,11 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
                 rect.x, rect.y, rect.width, rect.height
             );
         }
+
         coordA = this.imageToViewportCoordinates(
             imageX, imageY
         );
-        coordB = this.imageToViewportCoordinates(
+        coordB = this._imageToViewportDelta(
             pixelWidth, pixelHeight
         );
         return new $.Rect(
@@ -969,6 +1072,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * the viewport in point coordinates to image rectangle coordinates.
      * This method can be called either by passing X,Y,width,height or an
      * OpenSeadragon.Rect
+     * Note: not accurate with multi-image; use TiledImage.viewportToImageRectangle instead.
      * @function
      * @param {OpenSeadragon.Rect} viewerX the rectangle in viewport coordinate system.
      * @param {Number} viewerX the X coordinate of the top left corner of the rectangle
@@ -989,8 +1093,9 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
                 rect.x, rect.y, rect.width, rect.height
             );
         }
+
         coordA = this.viewportToImageCoordinates( viewerX, viewerY );
-        coordB = this.viewportToImageCoordinates( pointWidth, pointHeight );
+        coordB = this._viewportToImageDelta(pointWidth, pointHeight);
         return new $.Rect(
             coordA.x,
             coordA.y,
@@ -1002,6 +1107,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     /**
      * Convert pixel coordinates relative to the viewer element to image
      * coordinates.
+     * Note: not accurate with multi-image.
      * @param {OpenSeadragon.Point} pixel
      * @returns {OpenSeadragon.Point}
      */
@@ -1013,6 +1119,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     /**
      * Convert pixel coordinates relative to the image to
      * viewer element coordinates.
+     * Note: not accurate with multi-image.
      * @param {OpenSeadragon.Point} pixel
      * @returns {OpenSeadragon.Point}
      */
@@ -1023,6 +1130,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
 
     /**
      * Convert pixel coordinates relative to the window to image coordinates.
+     * Note: not accurate with multi-image.
      * @param {OpenSeadragon.Point} pixel
      * @returns {OpenSeadragon.Point}
      */
@@ -1034,6 +1142,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
 
     /**
      * Convert image coordinates to pixel coordinates relative to the window.
+     * Note: not accurate with multi-image.
      * @param {OpenSeadragon.Point} pixel
      * @returns {OpenSeadragon.Point}
      */
@@ -1091,15 +1200,21 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * 1 means original image size, 0.5 half size...
      * Viewport zoom: ratio of the displayed image's width to viewport's width.
      * 1 means identical width, 2 means image's width is twice the viewport's width...
+     * Note: not accurate with multi-image.
      * @function
      * @param {Number} viewportZoom The viewport zoom
      * target zoom.
      * @returns {Number} imageZoom The image zoom
      */
     viewportToImageZoom: function( viewportZoom ) {
-        var imageWidth = this.viewer.source.dimensions.x;
-        var containerWidth = this.getContainerSize().x;
-        var viewportToImageZoomRatio = containerWidth / imageWidth;
+        if (this.viewer && this.viewer.world.getItemCount() > 1) {
+            $.console.error('[Viewport.viewportToImageZoom] is not accurate with multi-image.');
+        }
+
+        var imageWidth = this.contentSize.x;
+        var containerWidth = this._containerInnerSize.x;
+        var scale = this.homeBounds.width;
+        var viewportToImageZoomRatio = (containerWidth / imageWidth) * scale;
         return viewportZoom * viewportToImageZoomRatio;
     },
 
@@ -1109,15 +1224,21 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      * 1 means original image size, 0.5 half size...
      * Viewport zoom: ratio of the displayed image's width to viewport's width.
      * 1 means identical width, 2 means image's width is twice the viewport's width...
+     * Note: not accurate with multi-image.
      * @function
      * @param {Number} imageZoom The image zoom
      * target zoom.
      * @returns {Number} viewportZoom The viewport zoom
      */
     imageToViewportZoom: function( imageZoom ) {
-        var imageWidth = this.viewer.source.dimensions.x;
-        var containerWidth = this.getContainerSize().x;
-        var viewportToImageZoomRatio = imageWidth / containerWidth;
+        if (this.viewer && this.viewer.world.getItemCount() > 1) {
+            $.console.error('[Viewport.imageToViewportZoom] is not accurate with multi-image.');
+        }
+
+        var imageWidth = this.contentSize.x;
+        var containerWidth = this._containerInnerSize.x;
+        var scale = this.homeBounds.width;
+        var viewportToImageZoomRatio = (imageWidth / containerWidth) / scale;
         return imageZoom * viewportToImageZoomRatio;
     }
 };

src/world.js

@@ -0,0 +1,393 @@
+/*
+ * OpenSeadragon - World
+ *
+ * Copyright (C) 2009 CodePlex Foundation
+ * Copyright (C) 2010-2013 OpenSeadragon contributors
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of CodePlex Foundation nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+(function( $ ){
+
+/**
+ * @class World
+ * @memberof OpenSeadragon
+ * @extends OpenSeadragon.EventSource
+ * @classdesc Keeps track of all of the tiled images in the scene.
+ * @param {Object} options - World options.
+ * @param {OpenSeadragon.Viewer} options.viewer - The Viewer that owns this World.
+ **/
+$.World = function( options ) {
+    var _this = this;
+
+    $.console.assert( options.viewer, "[World] options.viewer is required" );
+
+    $.EventSource.call( this );
+
+    this.viewer = options.viewer;
+    this._items = [];
+    this._needsDraw = false;
+    this._delegatedFigureSizes = function(event) {
+        _this._figureSizes();
+    };
+
+    this._figureSizes();
+};
+
+$.extend( $.World.prototype, $.EventSource.prototype, /** @lends OpenSeadragon.World.prototype */{
+    /**
+     * Add the specified item.
+     * @param {OpenSeadragon.TiledImage} item - The item to add.
+     * @param {Number} [options.index] - Index for the item. If not specified, goes at the top.
+     * @fires OpenSeadragon.World.event:add-item
+     * @fires OpenSeadragon.World.event:metrics-change
+     */
+    addItem: function( item, options ) {
+        $.console.assert(item, "[World.addItem] item is required");
+        $.console.assert(item instanceof $.TiledImage, "[World.addItem] only TiledImages supported at this time");
+
+        options = options || {};
+        if (options.index !== undefined) {
+            var index = Math.max(0, Math.min(this._items.length, options.index));
+            this._items.splice(index, 0, item);
+        } else {
+            this._items.push( item );
+        }
+
+        this._figureSizes();
+        this._needsDraw = true;
+
+        item.addHandler('bounds-change', this._delegatedFigureSizes);
+
+        /**
+         * Raised when an item is added to the World.
+         * @event add-item
+         * @memberOf OpenSeadragon.World
+         * @type {object}
+         * @property {OpenSeadragon.Viewer} eventSource - A reference to the World which raised the event.
+         * @property {OpenSeadragon.TiledImage} item - The item that has been added.
+         * @property {?Object} userData - Arbitrary subscriber-defined object.
+         */
+        this.raiseEvent( 'add-item', {
+            item: item
+        } );
+    },
+
+    /**
+     * Get the item at the specified index.
+     * @param {Number} index - The item's index.
+     * @returns {OpenSeadragon.TiledImage} The item at the specified index.
+     */
+    getItemAt: function( index ) {
+        $.console.assert(index !== undefined, "[World.getItemAt] index is required");
+        return this._items[ index ];
+    },
+
+    /**
+     * Get the index of the given item or -1 if not present.
+     * @param {OpenSeadragon.TiledImage} item - The item.
+     * @returns {Number} The index of the item or -1 if not present.
+     */
+    getIndexOfItem: function( item ) {
+        $.console.assert(item, "[World.getIndexOfItem] item is required");
+        return $.indexOf( this._items, item );
+    },
+
+    /**
+     * @returns {Number} The number of items used.
+     */
+    getItemCount: function() {
+        return this._items.length;
+    },
+
+    /**
+     * Change the index of a item so that it appears over or under others.
+     * @param {OpenSeadragon.TiledImage} item - The item to move.
+     * @param {Number} index - The new index.
+     * @fires OpenSeadragon.World.event:item-index-change
+     */
+    setItemIndex: function( item, index ) {
+        $.console.assert(item, "[World.setItemIndex] item is required");
+        $.console.assert(index !== undefined, "[World.setItemIndex] index is required");
+
+        var oldIndex = this.getIndexOfItem( item );
+
+        if ( index >= this._items.length ) {
+            throw new Error( "Index bigger than number of layers." );
+        }
+
+        if ( index === oldIndex || oldIndex === -1 ) {
+            return;
+        }
+
+        this._items.splice( oldIndex, 1 );
+        this._items.splice( index, 0, item );
+        this._needsDraw = true;
+
+        /**
+         * Raised when the order of the indexes has been changed.
+         * @event item-index-change
+         * @memberOf OpenSeadragon.World
+         * @type {object}
+         * @property {OpenSeadragon.World} eventSource - A reference to the World which raised the event.
+         * @property {OpenSeadragon.TiledImage} item - The item whose index has
+         * been changed
+         * @property {Number} previousIndex - The previous index of the item
+         * @property {Number} newIndex - The new index of the item
+         * @property {?Object} userData - Arbitrary subscriber-defined object.
+         */
+        this.raiseEvent( 'item-index-change', {
+            item: item,
+            previousIndex: oldIndex,
+            newIndex: index
+        } );
+    },
+
+    /**
+     * Remove an item.
+     * @param {OpenSeadragon.TiledImage} item - The item to remove.
+     * @fires OpenSeadragon.World.event:remove-item
+     * @fires OpenSeadragon.World.event:metrics-change
+     */
+    removeItem: function( item ) {
+        $.console.assert(item, "[World.removeItem] item is required");
+
+        var index = $.indexOf(this._items, item );
+        if ( index === -1 ) {
+            return;
+        }
+
+        item.removeHandler('bounds-change', this._delegatedFigureSizes);
+        this._items.splice( index, 1 );
+        this._figureSizes();
+        this._needsDraw = true;
+        this._raiseRemoveItem(item);
+    },
+
+    /**
+     * Remove all items.
+     * @fires OpenSeadragon.World.event:remove-item
+     * @fires OpenSeadragon.World.event:metrics-change
+     */
+    removeAll: function() {
+        var item;
+        for (var i = 0; i < this._items.length; i++) {
+            item = this._items[i];
+            item.removeHandler('bounds-change', this._delegatedFigureSizes);
+        }
+
+        var removedItems = this._items;
+        this._items = [];
+        this._figureSizes();
+        this._needsDraw = true;
+
+        for (i = 0; i < removedItems.length; i++) {
+            item = removedItems[i];
+            this._raiseRemoveItem(item);
+        }
+    },
+
+    /**
+     * Clears all tiles and triggers updates for all items.
+     */
+    resetItems: function() {
+        for ( var i = 0; i < this._items.length; i++ ) {
+            this._items[i].reset();
+        }
+    },
+
+    /**
+     * Updates (i.e. animates bounds of) all items.
+     */
+    update: function() {
+        var animated = false;
+        for ( var i = 0; i < this._items.length; i++ ) {
+            animated = this._items[i].update() || animated;
+        }
+
+        return animated;
+    },
+
+    /**
+     * Draws all items.
+     */
+    draw: function() {
+        for ( var i = 0; i < this._items.length; i++ ) {
+            this._items[i].draw();
+        }
+
+        this._needsDraw = false;
+    },
+
+    /**
+     * @returns {Boolean} true if any items need updating.
+     */
+    needsDraw: function() {
+        for ( var i = 0; i < this._items.length; i++ ) {
+            if ( this._items[i].needsDraw() ) {
+                return true;
+            }
+        }
+        return this._needsDraw;
+    },
+
+    /**
+     * @returns {OpenSeadragon.Rect} The smallest rectangle that encloses all items, in viewport coordinates.
+     */
+    getHomeBounds: function() {
+        return this._homeBounds.clone();
+    },
+
+    /**
+     * To facilitate zoom constraints, we keep track of the pixel density of the
+     * densest item in the World (i.e. the item whose content size to viewport size
+     * ratio is the highest) and save it as this "content factor".
+     * @returns {Number} the number of content units per viewport unit.
+     */
+    getContentFactor: function() {
+        return this._contentFactor;
+    },
+
+    /**
+     * Arranges all of the TiledImages with the specified settings.
+     * @param {Object} options - Specifies how to arrange.
+     * @param {Boolean} [options.immediately=false] - Whether to animate to the new arrangement.
+     * @param {String} [options.layout] - See collectionLayout in {@link OpenSeadragon.Options}.
+     * @param {Number} [options.rows] - See collectionRows in {@link OpenSeadragon.Options}.
+     * @param {Number} [options.tileSize] - See collectionTileSize in {@link OpenSeadragon.Options}.
+     * @param {Number} [options.tileMargin] - See collectionTileMargin in {@link OpenSeadragon.Options}.
+     * @fires OpenSeadragon.World.event:metrics-change
+     */
+    arrange: function(options) {
+        options = options || {};
+        var immediately = options.immediately || false;
+        var layout = options.layout || $.DEFAULT_SETTINGS.collectionLayout;
+        var rows = options.rows || $.DEFAULT_SETTINGS.collectionRows;
+        var tileSize = options.tileSize || $.DEFAULT_SETTINGS.collectionTileSize;
+        var tileMargin = options.tileMargin || $.DEFAULT_SETTINGS.collectionTileMargin;
+        var increment = tileSize + tileMargin;
+        var wrap = Math.ceil(this._items.length / rows);
+        var x = 0;
+        var y = 0;
+        var item, box, width, height, position;
+        for (var i = 0; i < this._items.length; i++) {
+            if (i && (i % wrap) === 0) {
+                if (layout === 'horizontal') {
+                    y += increment;
+                    x = 0;
+                } else {
+                    x += increment;
+                    y = 0;
+                }
+            }
+
+            item = this._items[i];
+            box = item.getBounds();
+            if (box.width > box.height) {
+                width = tileSize;
+            } else {
+                width = tileSize * (box.width / box.height);
+            }
+
+            height = width * (box.height / box.width);
+            position = new $.Point(x + ((tileSize - width) / 2),
+                y + ((tileSize - height) / 2));
+
+            item.setPosition(position, immediately);
+            item.setWidth(width, immediately);
+
+            if (layout === 'horizontal') {
+                x += increment;
+            } else {
+                y += increment;
+            }
+        }
+    },
+
+    // private
+    _figureSizes: function() {
+        var oldHomeBounds = this._homeBounds ? this._homeBounds.clone() : null;
+        var oldContentSize = this._contentSize ? this._contentSize.clone() : null;
+        var oldContentFactor = this._contentFactor || 0;
+
+        if ( !this._items.length ) {
+            this._homeBounds = new $.Rect(0, 0, 1, 1);
+            this._contentSize = new $.Point(1, 1);
+            this._contentFactor = 1;
+        } else {
+            var bounds = this._items[0].getBounds();
+            this._contentFactor = this._items[0].getContentSize().x / bounds.width;
+            var left = bounds.x;
+            var top = bounds.y;
+            var right = bounds.x + bounds.width;
+            var bottom = bounds.y + bounds.height;
+            var box;
+            for ( var i = 1; i < this._items.length; i++ ) {
+                box = this._items[i].getBounds();
+                this._contentFactor = Math.max(this._contentFactor, this._items[i].getContentSize().x / box.width);
+                left = Math.min( left, box.x );
+                top = Math.min( top, box.y );
+                right = Math.max( right, box.x + box.width );
+                bottom = Math.max( bottom, box.y + box.height );
+            }
+
+            this._homeBounds = new $.Rect( left, top, right - left, bottom - top );
+            this._contentSize = new $.Point(this._homeBounds.width * this._contentFactor,
+                this._homeBounds.height * this._contentFactor);
+        }
+
+        if (this._contentFactor !== oldContentFactor || !this._homeBounds.equals(oldHomeBounds) ||
+                !this._contentSize.equals(oldContentSize)) {
+            /**
+             * Raised when the home bounds or content factor change.
+             * @event metrics-change
+             * @memberOf OpenSeadragon.World
+             * @type {object}
+             * @property {OpenSeadragon.World} eventSource - A reference to the World which raised the event.
+             * @property {?Object} userData - Arbitrary subscriber-defined object.
+             */
+            this.raiseEvent('metrics-change', {});
+        }
+    },
+
+    // private
+    _raiseRemoveItem: function(item) {
+        /**
+         * Raised when an item is removed.
+         * @event remove-item
+         * @memberOf OpenSeadragon.World
+         * @type {object}
+         * @property {OpenSeadragon.World} eventSource - A reference to the World which raised the event.
+         * @property {OpenSeadragon.TiledImage} item - The item's underlying item.
+         * @property {?Object} userData - Arbitrary subscriber-defined object.
+         */
+        this.raiseEvent( 'remove-item', { item: item } );
+    }
+});
+
+}( OpenSeadragon ));

test/coverage.html

@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>OpenSeadragon QUnit</title>
+    <link rel="stylesheet" href="/node_modules/qunitjs/qunit/qunit.css">
+    <link rel="stylesheet" href="/test/lib/jquery-ui-1.10.2/css/smoothness/jquery-ui-1.10.2.min.css">
+    <link rel="stylesheet" href="/test/helpers/test.css">
+</head>
+<body>
+    <div id="qunit"></div>
+    <div id="qunit-fixture"></div>
+    <script src="/node_modules/qunitjs/qunit/qunit.js"></script>
+    <script src="/test/lib/jquery-1.9.1.min.js"></script>
+    <script src="/test/lib/jquery-ui-1.10.2/js/jquery-ui-1.10.2.min.js"></script>
+    <script src="/test/lib/jquery.simulate.js"></script>
+
+    <!-- OpenSeadragon sources -->
+    <script src="/src/openseadragon.js"></script>
+    <script src="/src/fullscreen.js"></script>
+    <script src="/src/eventsource.js"></script>
+    <script src="/src/mousetracker.js"></script>
+    <script src="/src/control.js"></script>
+    <script src="/src/controldock.js"></script>
+    <script src="/src/viewer.js"></script>
+    <script src="/src/navigator.js"></script>
+    <script src="/src/strings.js"></script>
+    <script src="/src/point.js"></script>
+    <script src="/src/tilesource.js"></script>
+    <script src="/src/dzitilesource.js"></script>
+    <script src="/src/iiiftilesource.js"></script>
+    <script src="/src/osmtilesource.js"></script>
+    <script src="/src/tmstilesource.js"></script>
+    <script src="/src/legacytilesource.js"></script>
+    <script src="/src/tilesourcecollection.js"></script>
+    <script src="/src/button.js"></script>
+    <script src="/src/buttongroup.js"></script>
+    <script src="/src/rectangle.js"></script>
+    <script src="/src/referencestrip.js"></script>
+    <script src="/src/displayrectangle.js"></script>
+    <script src="/src/spring.js"></script>
+    <script src="/src/imageLoader.js"></script>
+    <script src="/src/tile.js"></script>
+    <script src="/src/overlay.js"></script>
+    <script src="/src/drawer.js"></script>
+    <script src="/src/viewport.js"></script>
+    <script src="/src/tiledimage.js"></script>
+    <script src="/src/tilecache.js"></script>
+    <script src="/src/world.js"></script>
+
+    <!-- Helpers -->
+    <script src="/test/helpers/legacy.mouse.shim.js"></script>
+    <script src="/test/helpers/test.js"></script>
+
+    <!-- Modules -->
+    <!-- Polyfill must be inserted first because it is testing functions
+         reassignments which could be done by other test. -->
+    <script src="/test/modules/polyfills.js"></script>
+    <script src="/test/modules/basic.js"></script>
+    <script src="/test/modules/strings.js"></script>
+    <script src="/test/modules/formats.js"></script>
+    <script src="/test/modules/utils.js"></script>
+    <script src="/test/modules/events.js"></script>
+    <script src="/test/modules/units.js"></script>
+    <script src="/test/modules/multi-image.js"></script>
+    <script src="/test/modules/overlays.js"></script>
+    <script src="/test/modules/controls.js"></script>
+    <script src="/test/modules/viewport.js"></script>
+    <script src="/test/modules/world.js"></script>
+    <script src="/test/modules/drawer.js"></script>
+    <script src="/test/modules/tiledimage.js"></script>
+    <script src="/test/modules/tilecache.js"></script>
+    <script src="/test/modules/referencestrip.js"></script>
+    <script src="/test/modules/tilesourcecollection.js"></script>
+    <!-- The navigator tests are the slowest (for now; hopefully they can be sped up)
+    so we put them last. -->
+    <script src="/test/modules/navigator.js"></script>
+</body>
+</html>

test/demo/collections/index.html

@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>OpenSeadragon Collections Demo</title>
+        <script type="text/javascript" src='../../../build/openseadragon/openseadragon.js'></script>
+        <script type="text/javascript" src='../../lib/jquery-1.9.1.min.js'></script>
+        <script type="text/javascript" src='main.js'></script>
+        <style type="text/css">
+
+            html,
+            body,
+            .openseadragon1 {
+                width: 100%;
+                height: 100%;
+                margin: 0;
+            }
+
+            .openseadragon1.small {
+                width: 50%;
+            }
+
+            .openseadragon-overlay {
+                background-color: rgba(255, 0, 0, 0.3);
+            }
+
+        </style>
+    </head>
+    <body>
+        <div id="contentDiv" class="openseadragon1"></div>
+    </body>
+</html>

test/demo/collections/main.js

@@ -0,0 +1,381 @@
+/* globals $, App */
+
+(function() {
+
+    window.App = {
+        init: function() {
+            var self = this;
+
+            var testInitialOpen = true;
+            var testOverlays = false;
+            var testMargins = false;
+            var testNavigator = false;
+            var margins;
+
+            var config = {
+                // debugMode: true,
+                zoomPerScroll: 1.02,
+                showNavigator: testNavigator,
+                useCanvas: true,
+                // defaultZoomLevel: 2,
+                // homeFillsViewer: true,
+                // sequenceMode: true,
+                // showReferenceStrip: true,
+                // referenceStripScroll: 'vertical',
+                navPrevNextWrap: false,
+                preserveViewport: false,
+                // collectionMode: true,
+                // collectionRows: 1,
+                // collectionLayout: 'vertical',
+                // collectionTileSize: 10,
+                // collectionTileMargin: 10,
+                // wrapHorizontal: true,
+                // wrapVertical: true,
+                id: "contentDiv",
+                prefixUrl: "../../../build/openseadragon/images/"
+            };
+
+            var highsmith = {
+                Image: {
+                    xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                    Url: "http://openseadragon.github.io/example-images/highsmith/highsmith_files/",
+                    Format: "jpg",
+                    Overlap: "2",
+                    TileSize: "256",
+                    Size: {
+                        Height: "9221",
+                        Width:  "7026"
+                    }
+                }
+            };
+
+            if (testInitialOpen) {
+                config.tileSources = [
+                    {
+                        tileSource: "../../data/testpattern.dzi",
+                        x: 4,
+                        y: 2,
+                        width: 2
+                    },
+                    {
+                        tileSource: "../../data/tall.dzi",
+                        x: 1.5,
+                        y: 0,
+                        width: 1
+                    },
+                    {
+                        tileSource: '../../data/wide.dzi',
+                        opacity: 1,
+                        x: 0,
+                        y: 1.5,
+                        height: 1
+                    }
+                ];
+
+                // config.tileSources = {
+                //     tileSource: highsmith,
+                //     width: 1
+                // };
+            }
+
+            if (testOverlays) {
+                config.overlays = [
+                    {
+                        id: "overlay1",
+                        x: 2,
+                        y: 0,
+                        width: 0.25,
+                        height: 0.25
+                    },
+                    {
+                        px: 13,
+                        py: 120,
+                        width: 124,
+                        height: 132,
+                        id: "overlay"
+                    },
+                    {
+                        px: 400,
+                        py: 500,
+                        width: 400,
+                        height: 400,
+                        id: "fixed-overlay",
+                        placement: "TOP_LEFT"
+                    }
+                ];
+            }
+
+            if (testMargins) {
+                margins = {
+                    top: 250,
+                    left: 250,
+                    right: 250,
+                    bottom: 250
+                };
+
+                config.viewportMargins = margins;
+            }
+
+            this.viewer = OpenSeadragon(config);
+
+            if (testInitialOpen) {
+                function openHandler() {
+                    self.viewer.removeHandler('open', openHandler);
+                }
+
+                this.viewer.addHandler( "open", openHandler);
+            }
+
+            if (testMargins) {
+                this.viewer.addHandler('animation', function() {
+                    var box = new OpenSeadragon.Rect(margins.left, margins.top,
+                        $('#contentDiv').width() - (margins.left + margins.right),
+                        $('#contentDiv').height() - (margins.top + margins.bottom));
+
+                    self.viewer.drawer.debugRect(box);
+                });
+            }
+
+            if (!testInitialOpen) {
+                this.basicTest();
+            }
+        },
+
+        // ----------
+        shrink: function(index) {
+            index = index || 0;
+            var image = this.viewer.world.getItemAt(index);
+            image.setWidth(image.getBounds().width * 0.3);
+        },
+
+        // ----------
+        move: function(index) {
+            index = index || 0;
+            var image = this.viewer.world.getItemAt(index);
+            var point = image.getBounds().getTopLeft();
+            point.x += image.getBounds().width * 0.3;
+            image.setPosition(point);
+        },
+
+        // ----------
+        add: function() {
+            var self = this;
+
+            this.viewer.addTiledImage({
+                tileSource: "../../data/testpattern.dzi",
+                width: 1,
+                success: function() {
+                    self.viewer.viewport.goHome();
+                }
+            });
+        },
+
+        // ----------
+        toggle: function() {
+            var $el = $(this.viewer.element);
+            $el.toggleClass('small');
+        },
+
+        // ----------
+        basicTest: function() {
+            var self = this;
+
+            this.viewer.addHandler('open', function() {
+            });
+
+            this.viewer.open({
+                tileSource: "../../data/testpattern.dzi",
+                width: 1
+            });
+        },
+
+        // ----------
+        crossTest: function() {
+            var self = this;
+
+            this.viewer.addHandler( "open", function() {
+                var options = {
+                    tileSource: '../../data/wide.dzi',
+                    opacity: 1,
+                    x: 0,
+                    y: 1.5,
+                    height: 1
+                };
+
+                var addItemHandler = function( event ) {
+                    if ( event.options === options ) {
+                        self.viewer.world.removeHandler( "add-item", addItemHandler );
+                        self.viewer.viewport.goHome();
+                    }
+                };
+                self.viewer.world.addHandler( "add-item", addItemHandler );
+                self.viewer.addTiledImage( options );
+            });
+
+            this.viewer.open({
+                tileSource: "../../data/tall.dzi",
+                x: 1.5,
+                y: 0,
+                width: 1
+            });
+        },
+
+        // ----------
+        crossTest2: function() {
+            this.viewer.open([
+                {
+                    tileSource: "../../data/tall.dzi",
+                    x: 1.5,
+                    y: 0,
+                    width: 1
+                },
+                {
+                    tileSource: '../../data/wide.dzi',
+                    x: 0,
+                    y: 1.5,
+                    height: 1
+                }
+            ]);
+        },
+
+        // ----------
+        crossTest3: function() {
+            var self = this;
+            var expected = 2;
+            var loaded = 0;
+
+            this.viewer.world.addHandler('add-item', function() {
+                loaded++;
+                if (loaded === expected) {
+                    // self.viewer.viewport.goHome();
+                }
+            });
+
+            this.viewer.addTiledImage({
+                tileSource: "../../data/tall.dzi",
+                x: 1.5,
+                y: 0,
+                width: 1
+            });
+
+            this.viewer.addTiledImage({
+                tileSource: '../../data/wide.dzi',
+                opacity: 1,
+                x: 0,
+                y: 1.5,
+                height: 1
+            });
+        },
+
+        // ----------
+        collectionTest: function() {
+            var tileSources = [];
+            var random;
+            for (var i = 0; i < 10; i++) {
+                random = Math.random();
+                if (random < 0.33) {
+                    tileSources.push('../../data/testpattern.dzi');
+                } else if (random < 0.66) {
+                    tileSources.push('../../data/tall.dzi');
+                } else {
+                    tileSources.push('../../data/wide.dzi');
+                }
+            }
+
+            this.viewer.open(tileSources);
+        },
+
+        // ----------
+        gridTest: function() {
+            var self = this;
+            var startX = -3;
+            var expected = 0;
+            var loaded = 0;
+
+            this.viewer.addHandler( "open", function() {
+                self.viewer.world.addHandler('add-item', function() {
+                    loaded++;
+                    if (loaded === expected) {
+                        self.viewer.viewport.goHome(true);
+                    }
+                });
+
+                var x, y;
+                for (y = 0; y < 6; y++) {
+                    for (x = 0; x < 6; x++) {
+                        if (!x && !y) {
+                            continue;
+                        }
+
+                        var options = {
+                            tileSource: '../../data/testpattern.dzi',
+                            x: startX + x,
+                            y: y,
+                            width: 1
+                        };
+
+                        expected++;
+                        self.viewer.addTiledImage( options );
+                    }
+                }
+            });
+
+            this.viewer.open({
+                tileSource: "../../data/testpattern.dzi",
+                x: startX,
+                y: 0,
+                width: 1
+            });
+        },
+
+        // ----------
+        bigTest: function() {
+            this.viewer.open({
+                tileSource: "../../data/testpattern.dzi",
+                x: -2,
+                y: -2,
+                width: 6
+            });
+        },
+
+        // ----------
+        cjTest: function() {
+            var imageKey = "e-pluribus-unum";
+            var imageXML = '<?xml version="1.0" encoding="UTF-8"?><Image TileSize="254" Overlap="1" Format="png" xmlns="http://schemas.microsoft.com/deepzoom/2008"><Size Width="88560" Height="88560"/></Image>';
+            var $xml = $($.parseXML(imageXML));
+            var $image = $xml.find('Image');
+            var $size = $xml.find('Size');
+
+            var dzi = {
+                Image: {
+                    xmlns: $image.attr('xmlns'),
+                    Url: "http://chrisjordan.com/dzi/" + imageKey + '_files/',
+                    Format: $image.attr('Format'),
+                    Overlap: $image.attr('Overlap'),
+                    TileSize: $image.attr('TileSize'),
+                    Size: {
+                        Height: $size.attr('Height'),
+                        Width: $size.attr('Width')
+                    }
+                }
+            };
+
+            this.viewer.open({
+                tileSource: dzi,
+                width: 100
+            });
+        },
+
+        // ----------
+        stanfordTest: function() {
+            var info = {"@context":"http://library.stanford.edu/iiif/image-api/1.1/context.json","@id":"http://ids.lib.harvard.edu/ids/iiif/48530377","width":6251,"height":109517,"scale_factors":[1,2,4,8,16,32],"tile_width":256,"tile_height":256,"formats":["jpg"],"qualities":["native"],"profile":"http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level1"};
+
+            this.viewer.open(info);
+        }
+    };
+
+    $(document).ready(function() {
+        App.init();
+    });
+
+})();

test/demo/item-animation.html

@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>OpenSeadragon Collections Demo</title>
+        <script type="text/javascript" src='../../build/openseadragon/openseadragon.js'></script>
+        <script type="text/javascript" src='../lib/jquery-1.9.1.min.js'></script>
+        <style type="text/css">
+
+            html,
+            body,
+            .openseadragon1 {
+                width: 100%;
+                height: 100%;
+                margin: 0;
+            }
+
+            .controls {
+                position: absolute;
+                right: 10px;
+                top: 10px;
+            }
+
+        </style>
+        <script>
+
+            // ----------
+            App = {
+                itemCount: 5,
+                positionRange: 100,
+                sizeRange: 30,
+                delay: 100,
+
+                // ----------
+                init: function() {
+                    var self = this;
+
+                    this.index = 0;
+                    this.paused = false;
+
+                    var tileSource = {
+                        Image: {
+                            xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                            Url: "http://openseadragon.github.io/example-images/highsmith/highsmith_files/",
+                            Format: "jpg",
+                            Overlap: "2",
+                            TileSize: "256",
+                            Size: {
+                                Height: "9221",
+                                Width:  "7026"
+                            }
+                        }
+                    };
+
+                    var tileSources = [];
+                    for (var i = 0; i < this.itemCount; i++) {
+                        tileSources.push(tileSource);
+                    }
+
+                    this.viewer = OpenSeadragon({
+                        id: "contentDiv",
+                        prefixUrl: "../../build/openseadragon/images/",
+                        tileSources: tileSources
+                    });
+
+                    this.viewer.addHandler('open', function() {
+                        self.updateCount();
+
+                        self.viewer.viewport.fitBounds(new OpenSeadragon.Rect(0, 0,
+                            self.positionRange + self.sizeRange,
+                            self.positionRange + self.sizeRange));
+
+                        self.animate();
+                    });
+
+                    var $pause = $('.toggle-pause').click(function() {
+                        self.paused = !self.paused;
+                        $pause.text(self.paused ? 'Play' : 'Pause');
+                    });
+
+                    $('.add').click(function() {
+                        for (var i = 0; i < self.itemCount; i++) {
+                            self.viewer.addTiledImage({
+                                tileSource: tileSource,
+                                x: Math.random() * self.positionRange,
+                                y: Math.random() * self.positionRange,
+                                width: Math.random() * self.sizeRange,
+                                success: function() {
+                                    self.updateCount();
+                                }
+                            });
+                        }
+                    });
+                },
+
+                // ----------
+                animate: function() {
+                    var self = this;
+
+                    if (!this.paused) {
+                        var item = this.viewer.world.getItemAt(this.index);
+                        item.setPosition(new OpenSeadragon.Point(Math.random() * this.positionRange,
+                            Math.random() * this.positionRange));
+
+                        item.setWidth(Math.random() * this.sizeRange);
+
+                        this.index = (this.index + 1) % this.viewer.world.getItemCount();
+                    }
+
+                    setTimeout(function() {
+                        self.animate();
+                    }, this.delay);
+                },
+
+                // ----------
+                updateCount: function() {
+                    $('.count').text(this.viewer.world.getItemCount());
+                }
+            };
+
+            // ----------
+            $(document).ready(function() {
+                App.init();
+            });
+
+        </script>
+    </head>
+    <body>
+        <div id="contentDiv" class="openseadragon1"></div>
+        <div class="controls">
+            <button class="toggle-pause">Pause</button>
+            <button class="add">Add More</button>
+            Image Count: <span class="count"></span>
+        </div>
+    </body>
+</html>

test/demo/m2/README.md

@@ -0,0 +1,20 @@
+# M2 Demo
+
+This is an advanced demo/testbed, for proposed improvements to the new version of the Mirador project:
+
+https://github.com/IIIF/m2/
+
+You can see a previous version of Mirador here:
+
+http://showcase.iiif.io/viewer/mirador/
+
+## To Do
+
+* Choosing between multiple versions of a page
+* Detail images overlaid on the page
+* Cropped images
+
+### Maybe
+
+* Show/hide pages?
+* Lazyloading tilesources?

test/demo/m2/index.html

@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>Mirador POC</title>
+        <script type="text/javascript" src='../../../build/openseadragon/openseadragon.js'></script>
+        <script type="text/javascript" src='../../lib/jquery-1.9.1.min.js'></script>
+        <script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
+        <script src="js/main.js"></script>
+        <!-- <script src="js/harvard-tilesources.js"></script> -->
+        <script src="js/openseadragon-svg-overlay.js"></script>
+        <style type="text/css">
+
+            html,
+            body {
+                width: 100%;
+                height: 100%;
+                margin: 0;
+            }
+
+            body {
+                background: #eee;
+                overflow: scroll;
+            }
+
+            .header {
+                height: 30px;
+            }
+
+            .nav {
+                display: inline-block;
+                margin-left: 50px;
+            }
+
+            .active {
+                background: #ddf;
+            }
+
+            .hidden {
+                visibility: hidden;
+            }
+
+            .openseadragon1 {
+                background: white;
+            }
+
+            .viewer-position {
+                position: absolute;
+                left: 0;
+                top: 30px;
+                right: 0;
+                bottom: 0;
+            }
+
+            .scroll-cover {
+                display: none;
+                overflow: scroll;
+                z-index: 100;
+            }
+
+        </style>
+    </head>
+    <body>
+        <div class="header">
+            <button class="thumbs">Thumbnails</button>
+            <button class="scroll">Scroll</button>
+            <button class="book">Book</button>
+            <button class="page">Page</button>
+            <div class="nav">
+                <button class="previous">Previous</button>
+                <button class="next">Next</button>
+            </div>
+        </div>
+        <div id="contentDiv" class="openseadragon1 viewer-position"></div>
+        <div class="scroll-cover viewer-position">
+            <div class="scroll-inner"></div>
+        </div>
+    </body>
+</html>

test/demo/m2/js/.gitignore

@@ -0,0 +1 @@
+harvard-tilesources.js

test/demo/m2/js/main.js

@@ -0,0 +1,670 @@
+/* globals $, App, d3 */
+
+(function() {
+    // ----------
+    window.App = {
+        // ----------
+        init: function() {
+            var self = this;
+
+            this.maxImages = 500;
+            this.mode = 'none';
+            this.pageBuffer = 0.05;
+            this.bigBuffer = 0.2;
+            this.page = 0;
+            this.modeNames = [
+                'thumbs',
+                'scroll',
+                'book',
+                'page'
+            ];
+
+            this.viewer = OpenSeadragon({
+                id: "contentDiv",
+                prefixUrl: "../../../build/openseadragon/images/",
+                autoResize: false,
+                showHomeControl: false,
+                tileSources: this.getTileSources()
+            });
+
+            this.viewer.addHandler('open', function() {
+                self.$el = $(self.viewer.element);
+                self.setMode({
+                    mode: 'thumbs',
+                    immediately: true
+                });
+            });
+
+            this.viewer.addHandler('canvas-drag', function() {
+                if (self.mode === 'scroll') {
+                    var result = self.hitTest(self.viewer.viewport.getCenter());
+                    if (result) {
+                        self.page = result.index;
+                    }
+                }
+            });
+
+            this.viewer.addHandler('viewport-change', function(event) {
+                self.applyConstraints();
+            });
+
+            $.each(this.modeNames, function(i, v) {
+                $('.' + v).click(function() {
+                    self.setMode({
+                        mode: v
+                    });
+                });
+            });
+
+            $('.next').click(function() {
+                self.next();
+            });
+
+            $('.previous').click(function() {
+                self.previous();
+            });
+
+            $(window).keyup(function(event) {
+                if (self.mode === 'thumbs') {
+                    return;
+                }
+
+                if (event.which === 39) { // Right arrow
+                    self.next();
+                } else if (event.which === 37) { // Left arrow
+                    self.previous();
+                }
+            });
+
+            this.$scrollInner = $('.scroll-inner');
+
+            this.$scrollCover = $('.scroll-cover')
+                .scroll(function(event) {
+                    var info = self.getScrollInfo();
+                    if (!info || self.ignoreScroll) {
+                        return;
+                    }
+
+                    var pos = new OpenSeadragon.Point(info.thumbBounds.getCenter().x,
+                        info.thumbBounds.y + (info.viewportHeight / 2) +
+                        (info.viewportMax * info.scrollFactor));
+
+                    self.viewer.viewport.panTo(pos, true);
+                })
+                .mousemove(function(event) {
+                    var pixel = new OpenSeadragon.Point(event.clientX, event.clientY);
+                    var result = self.hitTest(self.viewer.viewport.pointFromPixel(pixel));
+                    self.updateHover(result ? result.index : -1);
+                })
+                .click(function(event) {
+                    var pixel = new OpenSeadragon.Point(event.clientX, event.clientY);
+                    var result = self.hitTest(self.viewer.viewport.pointFromPixel(pixel));
+                    if (result) {
+                        self.setMode({
+                            mode: 'page',
+                            page: result.index
+                        });
+                    }
+                });
+
+            var svgNode = this.viewer.svgOverlay();
+
+            this.highlight = d3.select(svgNode).append("rect")
+                .style('fill', 'none')
+                .style('stroke', '#08f')
+                .style('opacity', 0)
+                .style('stroke-width', 0.05)
+                .attr("pointer-events", "none");
+
+            this.hover = d3.select(svgNode).append("rect")
+                .style('fill', 'none')
+                .style('stroke', '#08f')
+                .style('opacity', 0)
+                .style('stroke-width', 0.05)
+                .attr("pointer-events", "none");
+
+            $(window).resize(function() {
+                var newSize = new OpenSeadragon.Point(self.$el.width(), self.$el.height());
+                self.viewer.viewport.resize(newSize, false);
+                self.setMode({
+                    mode: self.mode,
+                    immediately: true
+                });
+
+                self.viewer.forceRedraw();
+
+                self.viewer.svgOverlay('resize');
+            });
+
+            this.update();
+        },
+
+        // ----------
+        next: function() {
+            var page = this.page + (this.mode === 'book' ? 2 : 1);
+            if (this.mode === 'book' && page % 2 === 0 && page !== 0) {
+                page --;
+            }
+
+            this.goToPage({
+                page: page
+            });
+        },
+
+        // ----------
+        previous: function() {
+            var page = this.page - (this.mode === 'book' ? 2 : 1);
+            if (this.mode === 'book' && page % 2 === 0 && page !== 0) {
+                page --;
+            }
+
+            this.goToPage({
+                page: page
+            });
+        },
+
+        // ----------
+        hitTest: function(pos) {
+            var count = this.viewer.world.getItemCount();
+            var item, box;
+
+            for (var i = 0; i < count; i++) {
+                item = this.viewer.world.getItemAt(i);
+                box = item.getBounds();
+                if (pos.x > box.x && pos.y > box.y && pos.x < box.x + box.width &&
+                        pos.y < box.y + box.height) {
+                    return {
+                        item: item,
+                        index: i
+                    };
+                }
+            }
+
+            return null;
+        },
+
+        // ----------
+        getScrollInfo: function() {
+            if (!this.thumbBounds) {
+                return null;
+            }
+
+            var output = {};
+
+            var viewerWidth = this.$el.width();
+            var viewerHeight = this.$el.height();
+            var scrollTop = this.$scrollCover.scrollTop();
+            output.scrollMax = this.$scrollInner.height() - this.$scrollCover.height();
+            output.scrollFactor = (output.scrollMax > 0 ? scrollTop / output.scrollMax : 0);
+
+            output.thumbBounds = this.thumbBounds;
+            output.viewportHeight = output.thumbBounds.width * (viewerHeight / viewerWidth);
+            output.viewportMax = Math.max(0, output.thumbBounds.height - output.viewportHeight);
+            return output;
+        },
+
+        // ----------
+        update: function() {
+            var self = this;
+
+            $('.nav').toggle(this.mode === 'scroll' || this.mode === 'book' || this.mode === 'page');
+            $('.previous').toggleClass('hidden', this.page <= 0);
+            $('.next').toggleClass('hidden', this.page >= this.viewer.world.getItemCount() - 1);
+
+            $.each(this.modeNames, function(i, v) {
+                $('.' + v).toggleClass('active', v === self.mode);
+            });
+        },
+
+        // ----------
+        applyConstraints: function() {
+            if (this.mode === 'thumbs') {
+                return;
+            }
+
+            if (this.panBounds) {
+                var center = this.viewer.viewport.getCenter(true);
+                var viewBounds = this.viewer.viewport.getBounds(true);
+                var bounds = this.panBounds.clone();
+                var left = bounds.x + (viewBounds.width / 2);
+                var top = bounds.y + (viewBounds.height / 2);
+                var right = (bounds.x + bounds.width) - (viewBounds.width / 2);
+                var bottom = (bounds.y + bounds.height) - (viewBounds.height / 2);
+
+                var x;
+                if (left <= right) {
+                    x = Math.max(left, Math.min(right, center.x));
+                } else {
+                    x = bounds.x + (bounds.width / 2);
+                }
+
+                var y;
+                if (top <= bottom) {
+                    y = Math.max(top, Math.min(bottom, center.y));
+                } else {
+                    y = bounds.y + (bounds.height / 2);
+                }
+
+                if (x !== center.x || y !== center.y) {
+                    this.viewer.viewport.centerSpringX.current.value = x;
+                    this.viewer.viewport.centerSpringY.current.value = y;
+                }
+            }
+        },
+
+        // ----------
+        setMode: function(config) {
+            var self = this;
+
+            this.mode = config.mode;
+
+            if (config.page !== undefined) {
+                this.page = config.page; // Need to do this before layout
+            }
+
+            this.ignoreScroll = true;
+            this.thumbBounds = null;
+
+            var layout = this.createLayout();
+
+            if (this.mode === 'thumbs') {
+                this.viewer.gestureSettingsMouse.scrollToZoom = false;
+                this.viewer.zoomPerClick = 1;
+                this.viewer.panHorizontal = false;
+                this.viewer.panVertical = false;
+                var viewerWidth = this.$el.width();
+                var width = layout.bounds.width + (this.bigBuffer * 2);
+                var height = layout.bounds.height + (this.bigBuffer * 2);
+                var newHeight = viewerWidth * (height / width);
+                this.$scrollCover.show();
+                this.$scrollInner
+                    .css({
+                        height: newHeight
+                    });
+            } else {
+                this.viewer.gestureSettingsMouse.scrollToZoom = true;
+                this.viewer.zoomPerClick = 2;
+                this.viewer.panHorizontal = true;
+                this.viewer.panVertical = true;
+                this.$scrollCover.hide();
+            }
+
+            this.setLayout({
+                layout: layout,
+                immediately: config.immediately
+            });
+
+            if (this.mode === 'thumbs') {
+                // Set up thumbBounds
+                this.thumbBounds = this.viewer.world.getHomeBounds();
+                this.thumbBounds.x -= this.bigBuffer;
+                this.thumbBounds.y -= this.bigBuffer;
+                this.thumbBounds.width += (this.bigBuffer * 2);
+                this.thumbBounds.height += (this.bigBuffer * 2);
+
+                // Scroll to the appropriate location
+                var info = this.getScrollInfo();
+
+                var viewportBounds = this.thumbBounds.clone();
+                viewportBounds.y += info.viewportMax * info.scrollFactor;
+                viewportBounds.height = info.viewportHeight;
+
+                var itemBounds = this.viewer.world.getItemAt(this.page).getBounds();
+                var top = itemBounds.y - this.bigBuffer;
+                var bottom = top + itemBounds.height + (this.bigBuffer * 2);
+
+                var normalY;
+                if (top < viewportBounds.y) {
+                    normalY = top - this.thumbBounds.y;
+                } else if (bottom > viewportBounds.y + viewportBounds.height) {
+                    normalY = (bottom - info.viewportHeight) - this.thumbBounds.y;
+                }
+
+                if (normalY !== undefined) {
+                    var viewportFactor = normalY / info.viewportMax;
+                    this.$scrollCover.scrollTop(info.scrollMax * viewportFactor);
+                }
+            }
+
+            this.goHome({
+                immediately: config.immediately
+            });
+
+            this.viewer.viewport.minZoomLevel = this.viewer.viewport.getZoom();
+
+            this.update();
+            this.updateHighlight();
+            this.updateHover(-1);
+
+            clearTimeout(this.scrollTimeout);
+            this.scrollTimeout = setTimeout(function() {
+                self.ignoreScroll = false;
+            }, this.viewer.animationTime * 1000);
+        },
+
+        // ----------
+        updateHighlight: function() {
+            if (this.mode !== 'thumbs') {
+                this.highlight.style('opacity', 0);
+                return;
+            }
+
+            var item = this.viewer.world.getItemAt(this.page);
+            var box = item.getBounds();
+
+            this.highlight
+                .style('opacity', 1)
+                .attr("x", box.x)
+                .attr("width", box.width)
+                .attr("y", box.y)
+                .attr("height", box.height);
+        },
+
+        // ----------
+        updateHover: function(page) {
+            if (page === -1 || this.mode !== 'thumbs') {
+                this.hover.style('opacity', 0);
+                this.$scrollCover.css({
+                    'cursor': 'default'
+                });
+
+                return;
+            }
+
+            this.$scrollCover.css({
+                'cursor': 'pointer'
+            });
+
+            var item = this.viewer.world.getItemAt(page);
+            var box = item.getBounds();
+
+            this.hover
+                .style('opacity', 0.3)
+                .attr("x", box.x)
+                .attr("width", box.width)
+                .attr("y", box.y)
+                .attr("height", box.height);
+        },
+
+        // ----------
+        goToPage: function(config) {
+            var self = this;
+
+            var itemCount = this.viewer.world.getItemCount();
+            this.page = Math.max(0, Math.min(itemCount - 1, config.page));
+
+            var viewerWidth = this.$el.width();
+            var viewerHeight = this.$el.height();
+            var bounds = this.viewer.world.getItemAt(this.page).getBounds();
+            var x = bounds.x;
+            var y = bounds.y;
+            var width = bounds.width;
+            var height = bounds.height;
+            var box;
+
+            if (this.mode === 'book') {
+                var item;
+                if (this.page % 2) { // First in a pair
+                    item = this.viewer.world.getItemAt(this.page + 1);
+                    if (item) {
+                        width += item.getBounds().width;
+                    }
+                } else {
+                    item = this.viewer.world.getItemAt(this.page - 1);
+                    if (item) {
+                        box = item.getBounds();
+                        x -= width;
+                        width += box.width;
+                    }
+                }
+            }
+
+            x -= this.pageBuffer;
+            y -= this.pageBuffer;
+            width += (this.pageBuffer * 2);
+            height += (this.pageBuffer * 2);
+
+            if (this.mode === 'scroll') {
+                if (this.page === 0) {
+                    x = bounds.x - this.pageBuffer;
+                    width = height * (viewerWidth / viewerHeight);
+                } else if (this.page === this.viewer.world.getItemCount() - 1) {
+                    width = height * (viewerWidth / viewerHeight);
+                    x = (bounds.x + bounds.width + this.pageBuffer) - width;
+                }
+            }
+
+            box = new OpenSeadragon.Rect(x, y, width, height);
+            this.viewer.viewport.fitBounds(box, config.immediately);
+
+            this.panBounds = null;
+
+            var setPanBounds = function() {
+                if (self.mode === 'page' || self.mode === 'book') {
+                    self.panBounds = box;
+                } else if (self.mode === 'scroll') {
+                    self.panBounds = self.viewer.world.getItemAt(0).getBounds()
+                        .union(self.viewer.world.getItemAt(itemCount - 1).getBounds());
+
+                    self.panBounds.x -= self.pageBuffer;
+                    self.panBounds.y -= self.pageBuffer;
+                    self.panBounds.width += (self.pageBuffer * 2);
+                    self.panBounds.height += (self.pageBuffer * 2);
+                }
+            };
+
+            clearTimeout(this.panBoundsTimeout);
+            if (config.immediately) {
+                setPanBounds();
+            } else {
+                this.panBoundsTimeout = setTimeout(setPanBounds, this.viewer.animationTime * 1000);
+            }
+
+            this.viewer.viewport.minZoomLevel = this.viewer.viewport.getZoom();
+
+            this.update();
+        },
+
+        // ----------
+        createLayout: function() {
+            var viewerWidth = this.$el.width();
+            var viewerHeight = this.$el.height();
+            var layoutConfig = {};
+
+            if (this.mode === 'thumbs') {
+                layoutConfig.columns = Math.floor(viewerWidth / 150);
+                layoutConfig.buffer = this.bigBuffer;
+                layoutConfig.sameWidth = true;
+            } else if (this.mode === 'scroll') {
+                layoutConfig.buffer = this.pageBuffer;
+            } else if (this.mode === 'book' || this.mode === 'page') {
+                layoutConfig.book = (this.mode === 'book');
+                var height = 1 + (this.pageBuffer * 2);
+                // Note that using window here is approximate, but that's close enough.
+                // We can't use viewer, because it may be stretched for the thumbs view.
+                layoutConfig.buffer = (height * ($(window).width() / $(window).height())) / 2;
+            }
+
+            var layout = {
+                bounds: null,
+                specs: []
+            };
+
+            var count = this.viewer.world.getItemCount();
+            var x = 0;
+            var y = 0;
+            var offset = new OpenSeadragon.Point();
+            var rowHeight = 0;
+            var item, box;
+            for (var i = 0; i < count; i++) {
+                item = this.viewer.world.getItemAt(i);
+                box = item.getBounds();
+
+                if (i === this.page) {
+                    offset = box.getTopLeft().minus(new OpenSeadragon.Point(x, y));
+                }
+
+                box.x = x;
+                box.y = y;
+                if (layoutConfig.sameWidth) {
+                    box.height = box.height / box.width;
+                    box.width = 1;
+                } else {
+                    box.width = box.width / box.height;
+                    box.height = 1;
+                }
+
+                rowHeight = Math.max(rowHeight, box.height);
+
+                layout.specs.push({
+                    item: item,
+                    bounds: box
+                });
+
+                if (layoutConfig.columns && i % layoutConfig.columns === layoutConfig.columns - 1) {
+                    x = 0;
+                    y += rowHeight + layoutConfig.buffer;
+                    rowHeight = 0;
+                } else {
+                    if (!layoutConfig.book || i % 2 === 0) {
+                        x += layoutConfig.buffer;
+                    }
+
+                    x += box.width;
+                }
+            }
+
+            var pos, spec;
+            for (i = 0; i < count; i++) {
+                spec = layout.specs[i];
+                pos = spec.bounds.getTopLeft().plus(offset);
+                spec.bounds.x = pos.x;
+                spec.bounds.y = pos.y;
+
+                if (layout.bounds) {
+                    layout.bounds = layout.bounds.union(spec.bounds);
+                } else {
+                    layout.bounds = spec.bounds.clone();
+                }
+            }
+
+            return layout;
+        },
+
+        // ----------
+        setLayout: function(config) {
+            var spec;
+
+            for (var i = 0; i < config.layout.specs.length; i++) {
+                spec = config.layout.specs[i];
+                spec.item.setPosition(spec.bounds.getTopLeft(), config.immediately);
+                spec.item.setWidth(spec.bounds.width, config.immediately);
+            }
+        },
+
+        // ----------
+        goHome: function(config) {
+            var viewerWidth = this.$el.width();
+            var viewerHeight = this.$el.height();
+            var layoutConfig = {};
+
+            if (this.mode === 'thumbs') {
+                var info = this.getScrollInfo();
+                var box = this.thumbBounds.clone();
+                box.height = box.width * (viewerHeight / viewerWidth);
+                box.y += info.viewportMax * info.scrollFactor;
+                this.viewer.viewport.fitBounds(box, config.immediately);
+            } else {
+                this.goToPage({
+                    page: this.page,
+                    immediately: config.immediately
+                });
+            }
+        },
+
+        // ----------
+        getTileSources: function() {
+            if (this.tileSources) {
+                return $.map(this.tileSources.slice(0, this.maxImages), function(v, i) {
+                    return new OpenSeadragon.IIIFTileSource(v);
+                });
+            }
+
+            var inputs = [
+                {
+                    Image: {
+                        xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                        Url: "http://openseadragon.github.io/example-images/highsmith/highsmith_files/",
+                        Format: "jpg",
+                        Overlap: "2",
+                        TileSize: "256",
+                        Size: {
+                            Width:  "7026",
+                            Height: "9221"
+                        }
+                    }
+                }, {
+                    Image: {
+                        xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                        Url: "http://openseadragon.github.io/example-images/duomo/duomo_files/",
+                        Format: "jpg",
+                        Overlap: "2",
+                        TileSize: "256",
+                        Size: {
+                            Width:  "13920",
+                            Height: "10200"
+                        }
+                    }
+                }, {
+                //     Image: {
+                //         xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                //         Url: "../../data/tall_files/",
+                //         Format: "jpg",
+                //         Overlap: "1",
+                //         TileSize: "254",
+                //         Size: {
+                //             Width:  "500",
+                //             Height: "2000"
+                //         }
+                //     }
+                // }, {
+                //     Image: {
+                //         xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                //         Url: "../../data/wide_files/",
+                //         Format: "jpg",
+                //         Overlap: "1",
+                //         TileSize: "254",
+                //         Size: {
+                //             Width:  "2000",
+                //             Height: "500"
+                //         }
+                //     }
+                // }, {
+                    Image: {
+                        xmlns: "http://schemas.microsoft.com/deepzoom/2008",
+                        Url: "../../data/testpattern_files/",
+                        Format: "jpg",
+                        Overlap: "1",
+                        TileSize: "254",
+                        Size: {
+                            Width:  "1000",
+                            Height: "1000"
+                        }
+                    }
+                }
+            ];
+
+            var outputs = [];
+            for (var i = 0; i < this.maxImages; i++) {
+                outputs.push(inputs[Math.floor(Math.random() * inputs.length)]);
+            }
+
+            return outputs;
+        }
+    };
+
+    // ----------
+    $(document).ready(function() {
+        App.init();
+    });
+})();

test/demo/m2/js/openseadragon-svg-overlay.js

@@ -0,0 +1,73 @@
+(function() {
+
+    if (!window.OpenSeadragon) {
+        console.error('[openseadragon-svg-overlay] requires OpenSeadragon');
+        return;
+    }
+
+    var svgNS = 'http://www.w3.org/2000/svg';
+
+    var update = function(viewer) {
+        var info = viewer._svgOverlayInfo;
+
+        if (info.containerWidth !== viewer.container.clientWidth) {
+            info.containerWidth = viewer.container.clientWidth;
+            info.svg.setAttribute('width', info.containerWidth);
+        }
+
+        if (info.containerHeight !== viewer.container.clientHeight) {
+            info.containerHeight = viewer.container.clientHeight;
+            info.svg.setAttribute('height', info.containerHeight);
+        }
+
+        var p = viewer.viewport.pixelFromPoint(new OpenSeadragon.Point(0, 0), true);
+        var zoom = viewer.viewport.getZoom(true);
+        var scale = viewer.container.clientWidth * zoom;
+        info.node.setAttribute('transform',
+            'translate(' + p.x + ',' + p.y + ') scale(' + scale + ')');
+    };
+
+    OpenSeadragon.Viewer.prototype.svgOverlay = function(command) {
+        var self = this;
+
+        if (command === undefined) {
+            if (this._svgOverlayInfo) {
+                console.error('[openseadragon-svg-overlay] already initialized on this viewer');
+                return;
+            }
+
+            var info = this._svgOverlayInfo = {
+                containerWidth: 0,
+                containerHeight: 0
+            };
+
+            info.svg = document.createElementNS(svgNS, 'svg');
+            info.svg.setAttribute('pointer-events', 'none');
+            info.svg.style.position = 'absolute';
+            info.svg.style.left = 0;
+            info.svg.style.top = 0;
+            info.svg.style.width = '100%';
+            info.svg.style.height = '100%';
+            this.container.insertBefore(info.svg, this.canvas.nextSibling);
+
+            info.node = document.createElementNS(svgNS, 'g');
+            info.svg.appendChild(info.node);
+
+            this.addHandler('animation', function() {
+                update(self);
+            });
+
+            this.addHandler('open', function() {
+                update(self);
+            });
+
+            update(this);
+            return info.node;
+        } else if (command === 'resize') {
+            update(this);
+        } else {
+            console.error('[openseadragon-svg-overlay] unknown command: ' + command);
+        }
+    };
+
+})();

test/helpers/test.js

@@ -50,6 +50,7 @@
                 .simulate( OpenSeadragon.MouseTracker.haveMouseEnter ? 'mouseleave' : 'mouseout', event );
         },
 
+        // ----------
         initializeTestDOM: function () {
             $( "#qunit-fixture" )
                 .append( '<div><div id="example"></div><div id="exampleNavigator"></div></div>' )
@@ -57,14 +58,17 @@
                 .append( '<div id="tallexample"></div>' );
         },
 
+        // ----------
         equalsWithVariance: function ( value1, value2, variance ) {
             return Math.abs( value1 - value2 ) <= variance;
         },
 
+        // ----------
         assessNumericValue: function ( value1, value2, variance, message ) {
             ok( Util.equalsWithVariance( value1, value2, variance ), message + " Expected:" + value1 + " Found: " + value2 + " Variance: " + variance );
         },
 
+        // ----------
         timeWatcher: function ( time ) {
             time = time || 2000;
             var finished = false;
@@ -85,8 +89,46 @@
                     }
                 }
             };
+        },
+
+        // ----------
+        spyOnce: function(obj, functionName, callback) {
+            var original = obj[functionName];
+            obj[functionName] = function() {
+                obj[functionName] = original;
+                var result = callback.apply(this, arguments);
+                if (result === undefined) {
+                    result = original.apply(this, arguments);
                 }
 
+                return result;
+            };
+        },
+
+        // ----------
+        testDeprecation: function(obj0, member0, obj1, member1) {
+            var called = false;
+            var errored = false;
+
+            if (obj1 && member1) {
+                this.spyOnce(obj1, member1, function() {
+                    called = true;
+                    return false;
+                });
+            } else {
+                called = true;
+            }
+
+            this.spyOnce(OpenSeadragon.console, 'error', function(message) {
+                if (/deprecated/.test(message)) {
+                    errored = true;
+                }
+            });
+
+            obj0[member0]();
+            equal(called, true, 'called through for ' + member0);
+            equal(errored, true, 'errored for ' + member0);
+        }
     };
 
     /*
@@ -134,6 +176,12 @@
         }
     }
 
+    testConsole.assert = function(condition, message) {
+        if (condition) {
+            testConsole.error(message);
+        }
+    };
+
     OpenSeadragon.console = testConsole;
 } )();
 

test/layers.js

@@ -1,278 +0,0 @@
-/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
-
-( function() {
-    var viewer;
-
-    module( 'Layers', {
-        setup: function() {
-            $( '<div id="layersexample"></div>' ).appendTo( "#qunit-fixture" );
-
-            testLog.reset();
-
-            viewer = OpenSeadragon( {
-                id: 'layersexample',
-                prefixUrl: '/build/openseadragon/images/',
-                springStiffness: 100 // Faster animation = faster tests
-            });
-        },
-        teardown: function() {
-            if ( viewer && viewer.close ) {
-                viewer.close();
-            }
-
-            viewer = null;
-            $( "#layersexample" ).remove();
-        }
-    } );
-
-    // ----------
-    asyncTest( 'Layers operations', function() {
-        expect( 23 );
-        viewer.addHandler( "open", function( ) {
-            equal( 1, viewer.getLayersCount( ),
-                "One layer should be present after opening." );
-            var options = {
-                tileSource: {
-                    type: 'legacy-image-pyramid',
-                    levels: [ {
-                            url: "data/A.png",
-                            width: 1000,
-                            height: 1000
-                        } ]
-                }
-            };
-            viewer.addLayer( options );
-            viewer.addHandler( "add-layer", function addFirstLayerHandler( event ) {
-                viewer.removeHandler( "add-layer", addFirstLayerHandler );
-                var layer1 = event.drawer;
-                equal( viewer.getLayersCount( ), 2,
-                    "2 layers should be present after adding a layer." );
-                equal( options, event.options,
-                    "The options should be transmitted via the event." );
-                equal( viewer.getLevelOfLayer( layer1 ), 1,
-                    "The first added layer should have a level of 1" );
-                equal( viewer.getLayerAtLevel( 1 ), layer1,
-                    "The layer at level 1 should be the first added layer." );
-
-                viewer.addLayer( options );
-                viewer.addHandler( "add-layer", function addSecondLayerHandler( event ) {
-                    viewer.removeHandler( "add-layer", addSecondLayerHandler );
-                    var layer2 = event.drawer;
-                    equal( viewer.getLayersCount( ), 3,
-                        "3 layers should be present after adding a second layer." );
-                    equal( viewer.getLevelOfLayer( layer2 ), 2,
-                        "If not specified, a layer should be added with the highest level." );
-                    equal( viewer.getLayerAtLevel( 2 ), layer2,
-                        "The layer at level 2 should be the second added layer." );
-
-                    viewer.addHandler( "layer-level-changed",
-                        function layerLevelChangedHandler( event ) {
-                            viewer.removeHandler( "layer-level-changed",
-                                layerLevelChangedHandler );
-                            equal( event.drawer, layer2,
-                                "The layer which changed level should be layer2" );
-                            equal( event.previousLevel, 2, "Previous level should be 2." );
-                            equal( event.newLevel, 1, "New level should be 1." );
-                        });
-                    viewer.setLayerLevel( layer2, 1 );
-                    equal( viewer.getLevelOfLayer( layer2 ), 1,
-                        "Layer2 level should be 1 after setLayerLevel." );
-                    equal( viewer.getLevelOfLayer( layer1 ), 2,
-                        "Layer1 level should be 2 after setLayerLevel." );
-                    equal( viewer.getLayerAtLevel( 1 ), layer2,
-                        "The layer at level 1 should be layer2." );
-                    equal( viewer.getLayerAtLevel( 2 ), layer1,
-                        "The layer at level 2 should be layer1." );
-
-                    options.level = 2;
-                    options.tileSource.levels[0].url = "data/CCyan.png";
-                    options.opacity = 0.5;
-                    viewer.addLayer( options );
-                    viewer.addHandler( "add-layer", function addThirdLayerHandler( event ) {
-                        viewer.removeHandler( "add-layer", addThirdLayerHandler );
-                        var layer3 = event.drawer;
-                        equal( viewer.getLayersCount( ), 4,
-                            "4 layers should be present after adding a third layer." );
-                        equal( viewer.getLevelOfLayer( layer3 ), 2,
-                            "Layer 3 should be added with level 2." );
-                        equal( viewer.getLevelOfLayer( layer2 ), 1,
-                            "Layer 2 should stay at level 1." );
-
-                        viewer.addHandler( "remove-layer", function removeLayerHandler( event ) {
-                            viewer.removeHandler( "remove-layer", removeLayerHandler );
-
-                            equal( layer2, event.drawer, "Removed layer should be layer2." );
-
-                            equal( viewer.getLevelOfLayer( layer1 ), 2,
-                                "Layer 1 should be at level 2." );
-                            equal( viewer.getLevelOfLayer( layer2 ), -1,
-                                "Layer 2 should be at level -1." );
-                            equal( viewer.getLevelOfLayer( layer3 ), 1,
-                                "Layer 3 should be at level 1." );
-
-                        });
-                        viewer.removeLayer( layer2 );
-
-                        options.tileSource.levels[0].width = 500;
-                        viewer.addHandler( "add-layer-failed", function addLayerFailed( event ) {
-                            viewer.removeHandler( "add-layer-failed", addLayerFailed );
-
-                            equal( viewer.getLayersCount(), 3 );
-
-                            start();
-                        });
-                        viewer.addLayer( options );
-                    });
-                });
-            });
-        });
-        viewer.open( '/test/data/testpattern.dzi' );
-    });
-
-    asyncTest( 'Sequences as layers', function() {
-
-        var options = {
-            tileSource: [{
-                    type: 'legacy-image-pyramid',
-                    levels: [{
-                            url: "data/A.png",
-                            width: 1000,
-                            height: 1000
-                        }]
-                }, {
-                    type: 'legacy-image-pyramid',
-                    levels: [{
-                            url: "data/BBlue.png",
-                            width: 1000,
-                            height: 1000
-                        }]
-                }]
-        };
-
-        viewer.addHandler( "open", function openHandler() {
-            viewer.removeHandler( "open", openHandler );
-
-            viewer.addHandler( "add-layer-failed",
-                function addLayerFailedHandler( event ) {
-                    viewer.removeHandler( "add-layer-failed", addLayerFailedHandler );
-                    equal( event.message, "Sequences can not be added as layers." );
-                    equal( event.options, options, "Layer failed event should give the options." );
-                    start();
-                } );
-            viewer.addLayer( options );
-
-        });
-        viewer.open( '/test/data/testpattern.dzi' );
-    });
-
-
-    asyncTest( 'Reassign base layer', function() {
-
-        var options = {
-            tileSource: {
-                type: 'legacy-image-pyramid',
-                levels: [{
-                        url: "data/A.png",
-                        width: 1000,
-                        height: 1000
-                    }]
-            },
-            level: 0
-        };
-        viewer.addHandler( "open", function openHandler( ) {
-            viewer.removeHandler( "open", openHandler );
-            var testPatternDrawer = viewer.drawer;
-            equal( viewer.drawer, testPatternDrawer, "Viewer.drawer should be set to testPatternDrawer." );
-            viewer.addHandler( "add-layer", function addLayerHandler( event ) {
-                viewer.removeHandler( "add-layer", addLayerHandler );
-                var aDrawer = event.drawer;
-                equal( viewer.drawer, aDrawer, "Viewer.drawer should be set to aDrawer." );
-                viewer.setLayerLevel( aDrawer, 1 );
-                equal( viewer.drawer, testPatternDrawer, "Viewer.drawer should be set back to testPatternDrawer." );
-
-                viewer.removeLayer( viewer.drawer );
-                equal( viewer.drawer, aDrawer, "Viewer.drawer must be reassigned when removing base layer." );
-
-                viewer.removeLayer( viewer.drawer );
-                ok( !viewer.isOpen(), "Viewer should be closed when removing last layer." );
-
-                start();
-            });
-            viewer.addLayer( options );
-        });
-        viewer.open( '/test/data/testpattern.dzi' );
-    });
-
-    asyncTest( 'Layers and sequences', function() {
-        expect( 1 );
-
-// TODO: Remove workaround when issue #321 is fixed.
-// https://github.com/openseadragon/openseadragon/issues/321
-//    viewer.open( [{
-//            type: 'legacy-image-pyramid',
-//                levels: [ {
-//                url: "data/A.png",
-//                    width: 1000,
-//                    height: 1000
-//                }]
-//            },
-//            {
-//            type: 'legacy-image-pyramid',
-//                levels: [ {
-//                url: "data/BBlue.png",
-//                    width: 1000,
-//                    height: 1000
-//                }]}] );
-
-        viewer.close();
-        viewer = OpenSeadragon({
-            id: 'layersexample',
-            prefixUrl: '/build/openseadragon/images/',
-            springStiffness: 100, // Faster animation = faster tests
-            tileSources: [{
-                    type: 'legacy-image-pyramid',
-                    levels: [{
-                            url: "data/A.png",
-                            width: 1000,
-                            height: 1000
-                        }]
-                },
-                {
-                    type: 'legacy-image-pyramid',
-                    levels: [{
-                            url: "data/BBlue.png",
-                            width: 1000,
-                            height: 1000
-                        }]
-                }]
-        });
-// End workaround
-
-        var options = {
-            tileSource: {
-                type: 'legacy-image-pyramid',
-                levels: [{
-                        url: "data/CCyan.png",
-                        width: 1000,
-                        height: 1000
-                    }]
-            }
-        };
-
-        viewer.addHandler( "open", function openHandler() {
-            viewer.addHandler( "add-layer", function addLayerHandler( event ) {
-                viewer.removeHandler( "add-layer", addLayerHandler );
-
-                var layer = event.drawer;
-                try {
-                    viewer.setLayerLevel( layer, 0 );
-                } catch (e) {
-                    ok( true );
-                }
-                start();
-            } );
-            viewer.addLayer( options );
-        });
-
-    });
-})();

test/modules/basic.js

@@ -95,7 +95,8 @@
             var panHandler = function() {
                 viewer.removeHandler('animation-finish', panHandler);
                 center = viewport.getCenter();
-                ok(center.x === 0.1 && center.y === 0.1, 'Panned correctly');
+                Util.assessNumericValue(center.x, 0.1, 0.00001, 'panned horizontally');
+                Util.assessNumericValue(center.y, 0.1, 0.00001, 'panned vertically');
                 start();
             };
 
@@ -133,7 +134,7 @@
             };
 
             viewer.addHandler('animation-finish', homeHandler);
-            viewport.goHome(true);
+            viewer.viewport.goHome(true);
         }
 
         viewer.addHandler("open", opener);
@@ -260,9 +261,8 @@
                 viewer.removeHandler('close', closeHandler);
                 ok(!viewer.source, 'no source');
                 ok(true, 'Close event was sent');
-                ok(!viewer._updateRequestId, 'timer is off');
                 setTimeout(function() {
-                    ok(!viewer._updateRequestId, 'timer is still off');
+                    ok(!viewer._updateRequestId, 'timer is off');
                     start();
                 }, 100);
             };

test/modules/controls.js

@@ -5,7 +5,12 @@
 
     module('Controls', {
         setup: function () {
-            var example = $('<div id="controlsTests"></div>').appendTo("#qunit-fixture");
+            var example = $('<div id="controlsTests"></div>')
+                .css({
+                    width: 1000,
+                    height: 1000
+                })
+                .appendTo("#qunit-fixture");
 
             testLog.reset();
 
@@ -324,6 +329,7 @@
             ],
             springStiffness: 100, // Faster animation = faster tests
             showSequenceControl: true,
+            sequenceMode: true,
             navPrevNextWrap: false
         });
         viewer.addHandler('open', openHandler);
@@ -375,6 +381,7 @@
             ],
             springStiffness: 100, // Faster animation = faster tests
             showSequenceControl: true,
+            sequenceMode: true,
             navPrevNextWrap: true
         });
         viewer.addHandler('open', openHandler);

test/modules/drawer.js

@@ -0,0 +1,84 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
+
+(function() {
+    var viewer;
+
+    module('Drawer', {
+        setup: function () {
+            var example = $('<div id="example"></div>').appendTo("#qunit-fixture");
+
+            testLog.reset();
+        },
+        teardown: function () {
+            if (viewer && viewer.close) {
+                viewer.close();
+            }
+
+            viewer = null;
+        }
+    });
+
+    // ----------
+    var createViewer = function(options) {
+        options = options || {};
+        viewer = OpenSeadragon(OpenSeadragon.extend({
+            id:            'example',
+            prefixUrl:     '/build/openseadragon/images/',
+            springStiffness: 100 // Faster animation = faster tests
+        }, options));
+    };
+
+    // ----------
+    asyncTest('basics', function() {
+        createViewer();
+        ok(viewer.drawer, 'Drawer exists');
+        equal(viewer.drawer.canRotate(), OpenSeadragon.supportsCanvas, 'we can rotate if we have canvas');
+        equal(viewer.drawer.getOpacity(), 1, 'starts with full opacity');
+        viewer.drawer.setOpacity(0.4);
+        equal(viewer.drawer.getOpacity(), 0.4, 'setting opacity works');
+        start();
+    });
+
+    // ----------
+    asyncTest('rotation', function() {
+        createViewer({
+            tileSources: '/test/data/testpattern.dzi'
+        });
+
+        viewer.addHandler('open', function handler(event) {
+            viewer.viewport.setRotation(30);
+            Util.spyOnce(viewer.drawer.context, 'rotate', function() {
+                ok(true, 'drawing with new rotation');
+                start();
+            });
+        });
+    });
+
+    // ----------
+    asyncTest('debug', function() {
+        createViewer({
+            tileSources: '/test/data/testpattern.dzi',
+            debugMode: true
+        });
+
+        Util.spyOnce(viewer.drawer, 'drawDebugInfo', function() {
+            ok(true, 'drawDebugInfo is called');
+            start();
+        });
+    });
+
+    // ----------
+    asyncTest('deprecations', function() {
+        createViewer();
+        Util.testDeprecation(viewer.drawer, 'addOverlay', viewer, 'addOverlay');
+        Util.testDeprecation(viewer.drawer, 'updateOverlay', viewer, 'updateOverlay');
+        Util.testDeprecation(viewer.drawer, 'removeOverlay', viewer, 'removeOverlay');
+        Util.testDeprecation(viewer.drawer, 'clearOverlays', viewer, 'clearOverlays');
+        Util.testDeprecation(viewer.drawer, 'needsUpdate', viewer.world, 'needsDraw');
+        Util.testDeprecation(viewer.drawer, 'numTilesLoaded', viewer.tileCache, 'numTilesLoaded');
+        Util.testDeprecation(viewer.drawer, 'reset', viewer.world, 'resetItems');
+        Util.testDeprecation(viewer.drawer, 'update', viewer.world, 'draw');
+        start();
+    });
+
+})();

test/modules/multi-image.js

@@ -0,0 +1,178 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog, expect */
+
+( function() {
+    var viewer;
+
+    module( 'Multi-Image', {
+        setup: function() {
+            $( '<div id="itemsexample"></div>' ).appendTo( "#qunit-fixture" );
+
+            testLog.reset();
+
+            viewer = OpenSeadragon( {
+                id: 'itemsexample',
+                prefixUrl: '/build/openseadragon/images/',
+                springStiffness: 100 // Faster animation = faster tests
+            });
+        },
+        teardown: function() {
+            if ( viewer && viewer.close ) {
+                viewer.close();
+            }
+
+            viewer = null;
+            $( "#itemsexample" ).remove();
+        }
+    } );
+
+    // ----------
+    asyncTest( 'Multi-image operations', function() {
+        expect( 21 );
+        viewer.addHandler( "open", function( ) {
+            equal( 1, viewer.world.getItemCount( ),
+                "One item should be present after opening." );
+            var options = {
+                tileSource: {
+                    type: 'legacy-image-pyramid',
+                    levels: [ {
+                            url: "data/A.png",
+                            width: 1000,
+                            height: 1000
+                        } ]
+                }
+            };
+            viewer.addTiledImage( options );
+            viewer.world.addHandler( "add-item", function addFirstItemHandler( event ) {
+                viewer.world.removeHandler( "add-item", addFirstItemHandler );
+                var item1 = event.item;
+                equal( viewer.world.getItemCount( ), 2,
+                    "2 items should be present after adding a item." );
+                equal( viewer.world.getIndexOfItem( item1 ), 1,
+                    "The first added item should have a index of 1" );
+                equal( viewer.world.getItemAt( 1 ), item1,
+                    "The item at index 1 should be the first added item." );
+
+                viewer.addTiledImage( options );
+                viewer.world.addHandler( "add-item", function addSecondItemHandler( event ) {
+                    viewer.world.removeHandler( "add-item", addSecondItemHandler );
+                    var item2 = event.item;
+                    equal( viewer.world.getItemCount( ), 3,
+                        "3 items should be present after adding a second item." );
+                    equal( viewer.world.getIndexOfItem( item2 ), 2,
+                        "If not specified, a item should be added with the highest index." );
+                    equal( viewer.world.getItemAt( 2 ), item2,
+                        "The item at index 2 should be the second added item." );
+
+                    viewer.world.addHandler( "item-index-change",
+                        function itemIndexChangedHandler( event ) {
+                            viewer.world.removeHandler( "item-index-change",
+                                itemIndexChangedHandler );
+                            equal( event.item, item2,
+                                "The item which changed index should be item2" );
+                            equal( event.previousIndex, 2, "Previous index should be 2." );
+                            equal( event.newIndex, 1, "New index should be 1." );
+                        });
+                    viewer.world.setItemIndex( item2, 1 );
+                    equal( viewer.world.getIndexOfItem( item2 ), 1,
+                        "Item2 index should be 1 after setItemIndex." );
+                    equal( viewer.world.getIndexOfItem( item1 ), 2,
+                        "Item1 index should be 2 after setItemIndex." );
+                    equal( viewer.world.getItemAt( 1 ), item2,
+                        "The item at index 1 should be item2." );
+                    equal( viewer.world.getItemAt( 2 ), item1,
+                        "The item at index 2 should be item1." );
+
+                    options.index = 2;
+                    options.tileSource.levels[0].url = "data/CCyan.png";
+                    viewer.addTiledImage( options );
+                    viewer.world.addHandler( "add-item", function addThirdItemHandler( event ) {
+                        viewer.world.removeHandler( "add-item", addThirdItemHandler );
+                        var item3 = event.item;
+                        equal( viewer.world.getItemCount( ), 4,
+                            "4 items should be present after adding a third item." );
+                        equal( viewer.world.getIndexOfItem( item3 ), 2,
+                            "Item 3 should be added with index 2." );
+                        equal( viewer.world.getIndexOfItem( item2 ), 1,
+                            "Item 2 should stay at index 1." );
+
+                        viewer.world.addHandler( "remove-item", function removeItemHandler( event ) {
+                            viewer.world.removeHandler( "remove-item", removeItemHandler );
+
+                            equal( item2, event.item, "Removed item should be item2." );
+
+                            equal( viewer.world.getIndexOfItem( item1 ), 2,
+                                "Item 1 should be at index 2." );
+                            equal( viewer.world.getIndexOfItem( item2 ), -1,
+                                "Item 2 should be at index -1." );
+                            equal( viewer.world.getIndexOfItem( item3 ), 1,
+                                "Item 3 should be at index 1." );
+
+                            start();
+                        });
+
+                        viewer.world.removeItem( item2 );
+                    });
+                });
+            });
+        });
+        viewer.open( '/test/data/testpattern.dzi' );
+    });
+
+    // ----------
+    asyncTest( 'Sequences as items', function() {
+        var options = {
+            tileSource: [{
+                    type: 'legacy-image-pyramid',
+                    levels: [{
+                            url: "data/A.png",
+                            width: 1000,
+                            height: 1000
+                        }]
+                }, {
+                    type: 'legacy-image-pyramid',
+                    levels: [{
+                            url: "data/BBlue.png",
+                            width: 1000,
+                            height: 1000
+                        }]
+                }]
+        };
+
+        viewer.addHandler( "open", function openHandler() {
+            viewer.removeHandler( "open", openHandler );
+
+            viewer.addHandler( "add-item-failed",
+                function addItemFailedHandler( event ) {
+                    viewer.removeHandler( "add-item-failed", addItemFailedHandler );
+                    equal( event.message, "[Viewer.addTiledImage] Sequences can not be added; add them one at a time instead." );
+                    equal( event.options, options, "Item failed event should give the options." );
+                    start();
+                } );
+            viewer.addTiledImage( options );
+
+        });
+        viewer.open( '/test/data/testpattern.dzi' );
+    });
+
+    // ----------
+    asyncTest('items are added in order', function() {
+        viewer.addHandler('open', function(event) {
+            equal(viewer.world.getItemAt(0).getContentSize().y, 2000, 'first image is tall');
+            equal(viewer.world.getItemAt(0).getBounds().width, 4, 'first image has 4 width');
+            equal(viewer.world.getItemAt(1).getContentSize().x, 2000, 'second image is wide');
+            equal(viewer.world.getItemAt(1).getBounds().width, 2, 'second image has 2 width');
+            start();
+        });
+
+        viewer.open([
+            {
+                tileSource: '/test/data/tall.dzi',
+                width: 4
+            }, {
+                tileSource: '/test/data/wide.dzi',
+                width: 2
+            }
+        ]);
+    });
+
+})();

test/modules/navigator.js

@@ -1,6 +1,4 @@
-/* global QUnit, module, Util, $, console, test, asyncTest, start, ok, equal */
-
-QUnit.config.autostart = false;
+/* global QUnit, module, Util, $, console, test, asyncTest, start, ok, equal, propEqual */
 
 (function () {
     var debug = false,
@@ -31,10 +29,6 @@ QUnit.config.autostart = false;
         }
     });
 
-    $(document).ready(function () {
-        start();
-    });
-
     var resetTestVariables = function () {
         if (viewer) {
             viewer.close();
@@ -146,7 +140,7 @@ QUnit.config.autostart = false;
                 currentDisplayRegionLeft = displayRegion.position().left;
                 currentDisplayWidth = displayRegion.width();
                 viewerAndNavigatorDisplayReady = viewer.drawer !== null &&
-                    !viewer.drawer.needsUpdate() &&
+                    !viewer.world.needsDraw() &&
                     currentDisplayWidth > 0 &&
                     Util.equalsWithVariance(lastDisplayRegionLeft, currentDisplayRegionLeft, 0.0001) &&
                     Util.equalsWithVariance(lastDisplayWidth, currentDisplayWidth, 0.0001) &&
@@ -166,7 +160,7 @@ QUnit.config.autostart = false;
             else {
                 if (count === 40) {
                     console.log("waitForViewer:" +
-                        viewer.drawer + ":" + viewer.drawer.needsUpdate() + ":" +
+                        viewer.drawer + ":" + viewer.world.needsDraw() + ":" +
                         viewerAndNavigatorDisplayReady + ":" +
                         lastDisplayRegionLeft + ":" + currentDisplayRegionLeft + ":" +
                         lastDisplayWidth + ":" + currentDisplayWidth + ":" +
@@ -765,11 +759,11 @@ QUnit.config.autostart = false;
         var openHandler1 = function(event) {
             viewer.removeHandler('open', openHandler1);
             ok(viewer.navigator, 'navigator exists');
-            viewer.navigator.addHandler('open', navOpenHandler1);
+            viewer.navigator.world.addHandler('add-item', navOpenHandler1);
         };
 
         var navOpenHandler1 = function(event) {
-            viewer.navigator.removeHandler('open', navOpenHandler1);
+            viewer.navigator.world.removeHandler('add-item', navOpenHandler1);
             equal(viewer.navigator.source, viewer.source, 'viewer and navigator have the same source');
             ok(viewer.navigator._updateRequestId, 'navigator timer is on');
             viewer.addHandler('close', closeHandler1);
@@ -785,11 +779,11 @@ QUnit.config.autostart = false;
 
         var openHandler2 = function(event) {
             viewer.removeHandler('open', openHandler2);
-            viewer.navigator.addHandler('open', navOpenHandler2);
+            viewer.navigator.world.addHandler('add-item', navOpenHandler2);
         };
 
         var navOpenHandler2 = function(event) {
-            viewer.navigator.removeHandler('open', navOpenHandler2);
+            viewer.navigator.world.removeHandler('add-item', navOpenHandler2);
             equal(viewer.navigator.source, viewer.source, 'viewer and navigator have the same source');
             viewer.addHandler('close', closeHandler2);
             viewer.close();
@@ -797,13 +791,56 @@ QUnit.config.autostart = false;
 
         var closeHandler2 = function(event) {
             viewer.removeHandler('close', closeHandler2);
-            ok(!viewer.navigator._updateRequestId, 'navigator timer is off');
             setTimeout(function() {
-                ok(!viewer.navigator._updateRequestId, 'navigator timer is still off');
+                ok(!viewer.navigator._updateRequestId, 'navigator timer is off');
                 timeWatcher.done();
             }, 100);
         };
 
         viewer.addHandler('open', openHandler1);
     });
+
+    asyncTest('Item positions including collection mode', function() {
+        var navAddCount = 0;
+
+        viewer = OpenSeadragon({
+            id:            'example',
+            prefixUrl:     '/build/openseadragon/images/',
+            tileSources:   ['/test/data/testpattern.dzi', '/test/data/testpattern.dzi'],
+            springStiffness: 100, // Faster animation = faster tests
+            showNavigator:  true,
+            collectionMode: true
+        });
+
+        var openHandler = function() {
+            viewer.removeHandler('open', openHandler);
+            viewer.navigator.world.addHandler('add-item', navOpenHandler);
+        };
+
+        var navOpenHandler = function(event) {
+            navAddCount++;
+            if (navAddCount === 2) {
+                viewer.navigator.world.removeHandler('add-item', navOpenHandler);
+
+                setTimeout(function() {
+                    // Test initial formation
+                    equal(viewer.navigator.world.getItemCount(), 2, 'navigator has both items');
+                    for (var i = 0; i < 2; i++) {
+                        propEqual(viewer.navigator.world.getItemAt(i).getBounds(),
+                            viewer.world.getItemAt(i).getBounds(), 'bounds are the same');
+                    }
+
+                    // Try moving one
+                    viewer.world.getItemAt(0).setPosition(new OpenSeadragon.Point(-200, -200));
+                    propEqual(viewer.navigator.world.getItemAt(0).getBounds(),
+                        viewer.world.getItemAt(0).getBounds(), 'bounds are the same after move');
+
+                    start();
+                }, 1);
+            }
+        };
+
+        viewer.addHandler('open', openHandler);
+    });
+
 })();

test/modules/overlays.js

@@ -1,4 +1,4 @@
-/* global QUnit, module, Util, $, console, test, asyncTest, start, ok, equal */
+/* global QUnit, module, Util, $, console, test, asyncTest, start, ok, equal, testLog */
 
 ( function() {
     var viewer;
@@ -29,7 +29,7 @@
         }
         var ready = viewer.isOpen() &&
             viewer.drawer !== null &&
-            !viewer.drawer.needsUpdate() &&
+            !viewer.world.needsDraw() &&
             Util.equalsWithVariance( viewer.viewport.getBounds( true ).x,
                 viewer.viewport.getBounds().x, 0.000 ) &&
             Util.equalsWithVariance( viewer.viewport.getBounds( true ).y,
@@ -46,7 +46,7 @@
             }, 100 );
         } else {
             console.log( "waitForViewer:" + viewer.isOpen( ) + ":" + viewer.drawer +
-                ":" + viewer.drawer.needsUpdate() );
+                ":" + viewer.world.needsDraw() );
             handler();
         }
     }
@@ -532,4 +532,35 @@
 
     } );
 
+    // ----------
+    asyncTest('overlays appear immediately', function() {
+        equal($('#immediate-overlay0').length, 0, 'overlay 0 does not exist');
+        equal($('#immediate-overlay1').length, 0, 'overlay 1 does not exist');
+
+        viewer = OpenSeadragon( {
+            id: 'example-overlays',
+            prefixUrl: '/build/openseadragon/images/',
+            tileSources: '/test/data/testpattern.dzi',
+            springStiffness: 100, // Faster animation = faster tests
+            overlays: [ {
+                    x: 0,
+                    y: 0,
+                    id: "immediate-overlay0"
+                } ]
+        } );
+
+        viewer.addHandler('open', function() {
+            equal($('#immediate-overlay0').length, 1, 'overlay 0 exists');
+
+            viewer.addOverlay( {
+                x: 0,
+                y: 0,
+                id: "immediate-overlay1"
+            } );
+
+            equal($('#immediate-overlay1').length, 1, 'overlay 1 exists');
+            start();
+        });
+    });
+
 } )( );

test/modules/referencestrip.js

@@ -0,0 +1,46 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
+
+(function() {
+    var viewer;
+
+    module('ReferenceStrip', {
+        setup: function () {
+            var example = $('<div id="example"></div>').appendTo("#qunit-fixture");
+
+            testLog.reset();
+        },
+        teardown: function () {
+            if (viewer && viewer.close) {
+                viewer.close();
+            }
+
+            viewer = null;
+        }
+    });
+
+    // ----------
+    var createViewer = function(options) {
+        options = options || {};
+        viewer = OpenSeadragon(OpenSeadragon.extend({
+            id:            'example',
+            prefixUrl:     '/build/openseadragon/images/',
+            springStiffness: 100 // Faster animation = faster tests
+        }, options));
+    };
+
+    // ----------
+    asyncTest('basics', function() {
+        createViewer({
+            sequenceMode: true,
+            showReferenceStrip: true,
+            tileSources: [
+                '/test/data/tall.dzi',
+                '/test/data/wide.dzi',
+            ]
+        });
+
+        ok(viewer.referenceStrip, 'referenceStrip exists');
+        start();
+    });
+
+})();

test/modules/tilecache.js

@@ -0,0 +1,111 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
+
+(function() {
+
+    // ----------
+    module('TileCache', {
+        setup: function () {
+            testLog.reset();
+        },
+        teardown: function () {
+        }
+    });
+
+    // ----------
+    asyncTest('basics', function() {
+        var fakeTiledImage0 = {};
+        var fakeTiledImage1 = {};
+
+        var fakeTile0 = {
+            url: 'foo.jpg',
+            image: {},
+            unload: function() {}
+        };
+
+        var fakeTile1 = {
+            url: 'foo.jpg',
+            image: {},
+            unload: function() {}
+        };
+
+        var cache = new OpenSeadragon.TileCache();
+        equal(cache.numTilesLoaded(), 0, 'no tiles to begin with');
+
+        cache.cacheTile({
+            tile: fakeTile0,
+            tiledImage: fakeTiledImage0
+        });
+
+        equal(cache.numTilesLoaded(), 1, 'tile count after cache');
+
+        cache.cacheTile({
+            tile: fakeTile1,
+            tiledImage: fakeTiledImage1
+        });
+
+        equal(cache.numTilesLoaded(), 2, 'tile count after second cache');
+
+        cache.clearTilesFor(fakeTiledImage0);
+
+        equal(cache.numTilesLoaded(), 1, 'tile count after first clear');
+
+        cache.clearTilesFor(fakeTiledImage1);
+
+        equal(cache.numTilesLoaded(), 0, 'tile count after second clear');
+
+        start();
+    });
+
+    // ----------
+    asyncTest('maxImageCacheCount', function() {
+        var fakeTiledImage0 = {};
+
+        var fakeTile0 = {
+            url: 'different.jpg',
+            image: {},
+            unload: function() {}
+        };
+
+        var fakeTile1 = {
+            url: 'same.jpg',
+            image: {},
+            unload: function() {}
+        };
+
+        var fakeTile2 = {
+            url: 'same.jpg',
+            image: {},
+            unload: function() {}
+        };
+
+        var cache = new OpenSeadragon.TileCache({
+            maxImageCacheCount: 1
+        });
+
+        equal(cache.numTilesLoaded(), 0, 'no tiles to begin with');
+
+        cache.cacheTile({
+            tile: fakeTile0,
+            tiledImage: fakeTiledImage0
+        });
+
+        equal(cache.numTilesLoaded(), 1, 'tile count after add');
+
+        cache.cacheTile({
+            tile: fakeTile1,
+            tiledImage: fakeTiledImage0
+        });
+
+        equal(cache.numTilesLoaded(), 1, 'tile count after add of second image');
+
+        cache.cacheTile({
+            tile: fakeTile2,
+            tiledImage: fakeTiledImage0
+        });
+
+        equal(cache.numTilesLoaded(), 2, 'tile count after additional same image');
+
+        start();
+    });
+
+})();

test/modules/tiledimage.js

@@ -0,0 +1,194 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog, propEqual */
+
+(function() {
+    var viewer;
+
+    module('TiledImage', {
+        setup: function () {
+            var example = $('<div id="example"></div>').appendTo("#qunit-fixture");
+
+            testLog.reset();
+
+            viewer = OpenSeadragon({
+                id:            'example',
+                prefixUrl:     '/build/openseadragon/images/',
+                springStiffness: 100 // Faster animation = faster tests
+            });
+        },
+        teardown: function () {
+            if (viewer && viewer.close) {
+                viewer.close();
+            }
+
+            viewer = null;
+        }
+    });
+
+    // ----------
+    var checkBounds = function(image, expected, message) {
+        var bounds = image.getBounds();
+        equal(bounds.x, expected.x, message + ' x');
+        equal(bounds.y, expected.y, message + ' y');
+        equal(bounds.width, expected.width, message + ' width');
+        equal(bounds.height, expected.height, message + ' height');
+    };
+
+    // ----------
+    asyncTest('metrics', function() {
+        var handlerCount = 0;
+
+        viewer.addHandler('open', function(event) {
+            var image = viewer.world.getItemAt(0);
+            var contentSize = image.getContentSize();
+            equal(contentSize.x, 500, 'contentSize.x');
+            equal(contentSize.y, 2000, 'contentSize.y');
+
+            checkBounds(image, new OpenSeadragon.Rect(5, 6, 10, 40), 'initial bounds');
+
+            var scale = image.getContentSize().x / image.getBounds().width;
+            var viewportPoint = new OpenSeadragon.Point(10, 11);
+            var imagePoint = viewportPoint.minus(image.getBounds().getTopLeft()).times(scale);
+
+            propEqual(image.viewportToImageCoordinates(viewportPoint), imagePoint, 'viewportToImageCoordinates');
+            propEqual(image.imageToViewportCoordinates(imagePoint), viewportPoint, 'imageToViewportCoordinates');
+
+            var viewportRect = new OpenSeadragon.Rect(viewportPoint.x, viewportPoint.y, 6, 7);
+            var imageRect = new OpenSeadragon.Rect(imagePoint.x, imagePoint.y,
+                viewportRect.width * scale, viewportRect.height * scale);
+
+            propEqual(image.viewportToImageRectangle(viewportRect), imageRect, 'viewportToImageRectangle');
+            propEqual(image.imageToViewportRectangle(imageRect), viewportRect, 'imageToViewportRectangle');
+
+            image.addHandler('bounds-change', function boundsChangeHandler(event) {
+                image.removeHandler('bounds-change', boundsChangeHandler);
+                handlerCount++;
+            });
+
+            image.setPosition(new OpenSeadragon.Point(7, 8));
+            checkBounds(image, new OpenSeadragon.Rect(7, 8, 10, 40), 'bounds after position');
+
+            image.setWidth(5);
+            checkBounds(image, new OpenSeadragon.Rect(7, 8, 5, 20), 'bounds after width');
+
+            image.setHeight(4);
+            checkBounds(image, new OpenSeadragon.Rect(7, 8, 1, 4), 'bounds after width');
+
+            equal(handlerCount, 1, 'correct number of handlers called');
+            start();
+        });
+
+        viewer.open({
+            tileSource: '/test/data/tall.dzi',
+            x: 5,
+            y: 6,
+            width: 10
+        });
+    });
+
+    // ----------
+    asyncTest('animation', function() {
+        viewer.addHandler("open", function () {
+            var image = viewer.world.getItemAt(0);
+            propEqual(image.getBounds(), new OpenSeadragon.Rect(0, 0, 1, 1), 'target bounds on open');
+            propEqual(image.getBounds(true), new OpenSeadragon.Rect(0, 0, 1, 1), 'current bounds on open');
+
+            image.setPosition(new OpenSeadragon.Point(1, 2));
+            propEqual(image.getBounds(), new OpenSeadragon.Rect(1, 2, 1, 1), 'target bounds after position');
+            propEqual(image.getBounds(true), new OpenSeadragon.Rect(0, 0, 1, 1), 'current bounds after position');
+
+            image.setWidth(3);
+            propEqual(image.getBounds(), new OpenSeadragon.Rect(1, 2, 3, 3), 'target bounds after width');
+            propEqual(image.getBounds(true), new OpenSeadragon.Rect(0, 0, 1, 1), 'current bounds after width');
+
+            viewer.addHandler('animation-finish', function animationHandler() {
+                viewer.removeHandler('animation-finish', animationHandler);
+                propEqual(image.getBounds(), new OpenSeadragon.Rect(1, 2, 3, 3), 'target bounds after animation');
+                propEqual(image.getBounds(true), new OpenSeadragon.Rect(1, 2, 3, 3), 'current bounds after animation');
+                start();
+            });
+        });
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+    // ----------
+    asyncTest('update', function() {
+        var handlerCount = 0;
+
+        viewer.addHandler('open', function(event) {
+            var image = viewer.world.getItemAt(0);
+            equal(image.needsDraw(), true, 'needs draw after open');
+
+            viewer.addHandler('update-level', function updateLevelHandler(event) {
+                viewer.removeHandler('update-level', updateLevelHandler);
+                handlerCount++;
+                equal(event.eventSource, viewer, 'sender of update-level event was viewer');
+                equal(event.tiledImage, image, 'tiledImage of update-level event is correct');
+                ok('havedrawn' in event, 'update-level event includes havedrawn');
+                ok('level' in event, 'update-level event includes level');
+                ok('opacity' in event, 'update-level event includes opacity');
+                ok('visibility' in event, 'update-level event includes visibility');
+                ok('topleft' in event, 'update-level event includes topleft');
+                ok('bottomright' in event, 'update-level event includes bottomright');
+                ok('currenttime' in event, 'update-level event includes currenttime');
+                ok('best' in event, 'update-level event includes best');
+            });
+
+            viewer.addHandler('update-tile', function updateTileHandler(event) {
+                viewer.removeHandler('update-tile', updateTileHandler);
+                handlerCount++;
+                equal(event.eventSource, viewer, 'sender of update-tile event was viewer');
+                equal(event.tiledImage, image, 'tiledImage of update-level event is correct');
+                ok(event.tile, 'update-tile event includes tile');
+            });
+
+            viewer.addHandler('tile-drawing', function tileDrawingHandler(event) {
+                viewer.removeHandler('tile-drawing', tileDrawingHandler);
+                handlerCount++;
+                equal(event.eventSource, viewer, 'sender of tile-drawing event was viewer');
+                equal(event.tiledImage, image, 'tiledImage of update-level event is correct');
+                ok(event.tile, 'tile-drawing event includes a tile');
+                ok(event.context, 'tile-drawing event includes a context');
+                ok(event.rendered, 'tile-drawing event includes a rendered');
+            });
+
+            viewer.addHandler('tile-drawn', function tileDrawnHandler(event) {
+                viewer.removeHandler('tile-drawn', tileDrawnHandler);
+                handlerCount++;
+                equal(event.eventSource, viewer, 'sender of tile-drawn event was viewer');
+                equal(event.tiledImage, image, 'tiledImage of update-level event is correct');
+                ok(event.tile, 'tile-drawn event includes tile');
+
+                equal(handlerCount, 4, 'correct number of handlers called');
+                start();
+            });
+
+            image.draw();
+        });
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+    // ----------
+    asyncTest('reset', function() {
+        viewer.addHandler('tile-drawn', function updateHandler() {
+            viewer.removeHandler('tile-drawn', updateHandler);
+            ok(viewer.tileCache.numTilesLoaded() > 0, 'we have tiles after tile-drawn');
+            viewer.world.getItemAt(0).reset();
+            equal(viewer.tileCache.numTilesLoaded(), 0, 'no tiles after reset');
+
+            viewer.addHandler('tile-drawn', function updateHandler2() {
+                viewer.removeHandler('tile-drawn', updateHandler2);
+                ok(viewer.tileCache.numTilesLoaded() > 0, 'more tiles load');
+                viewer.world.getItemAt(0).destroy();
+                equal(viewer.tileCache.numTilesLoaded(), 0, 'no tiles after destroy');
+                start();
+            });
+        });
+
+        equal(viewer.tileCache.numTilesLoaded(), 0, 'no tiles at start');
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+})();

test/modules/tilesourcecollection.js

@@ -0,0 +1,20 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
+
+(function() {
+    var viewer;
+
+    module('TileSourceCollection', {
+        setup: function () {
+            testLog.reset();
+        },
+        teardown: function () {
+        }
+    });
+
+    // ----------
+    asyncTest('deprecation', function() {
+        Util.testDeprecation(OpenSeadragon, 'TileSourceCollection');
+        start();
+    });
+
+})();

test/modules/viewport.js

@@ -3,7 +3,7 @@
 (function () {
     var viewer;
     var VIEWER_ID = "example";
-    var PREFIX_URL = "/build/openseadragon/images";
+    var PREFIX_URL = "/build/openseadragon/images/";
     var SPRING_STIFFNESS = 100; // Faster animation = faster tests
 
      module("viewport", {
@@ -209,7 +209,7 @@
             method: 'getHomeBounds',
             processExpected: function(level, expected) {
                 // Have to special case this to avoid dividing by 0
-                if(level === 0){
+                if(level === -1 || level === 0){
                     expected = new OpenSeadragon.Rect(0, 0, 1, 1);
                 } else {
                     var sideLength = 1.0 / viewer.defaultZoomLevel;  // it's a square in this case
@@ -245,8 +245,10 @@
             viewport.zoomTo(ZOOM_FACTOR, null, true);
             viewport.update(); // need to call this even with immediately=true
 
-            // If the default zoom level is set to 0, then we expect the home zoom to be 1.
-            if(level === 0){
+            // Special cases for oddball levels
+            if (level === -1) {
+                expected = 0.25;
+            } else if(level === 0){
                 expected = 1;
             }
 
@@ -285,11 +287,11 @@
 
             for(var i = 0; i < testRects.length; i++){
                 var rect = testRects[i].times(viewport.getContainerSize());
-                viewport.resetContentSize(rect);
+                viewport.resetContentSize(rect.getSize());
                 viewport.update();
                 propEqual(
                     viewport.contentSize,
-                    rect,
+                    rect.getSize(),
                     "Reset content size correctly."
                 );
             }
@@ -407,7 +409,7 @@
             viewport.update();
             propEqual(
                 viewport.getBounds(),
-                new OpenSeadragon.Rect(-1.5,0,4,4),
+                new OpenSeadragon.Rect(0, 1.5, 1, 1),
                 "Viewport fit a tall image horizontally."
             );
             start();
@@ -424,7 +426,7 @@
             viewport.update();
             propEqual(
                 viewport.getBounds(),
-                new OpenSeadragon.Rect(0,0,0.25,0.25),
+                new OpenSeadragon.Rect(0.375, 0, 0.25, 0.25),
                 "Viewport fit a wide image vertically."
             );
             start();
@@ -719,9 +721,7 @@
                 return el.times(window_boundary);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(pos_point).divide(viewport.getContainerSize().x * ZOOM_FACTOR).plus(VIEWER_PADDING);
             },
             method: 'windowToViewportCoordinates'
@@ -735,9 +735,7 @@
                 return el.times(viewer.source.dimensions.x);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.plus(pos_point).minus(VIEWER_PADDING.times(viewport.getContainerSize().x * ZOOM_FACTOR));
             },
             method: 'imageToWindowCoordinates'
@@ -752,9 +750,7 @@
                 return el.times(window_boundary);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(pos_point).divide(viewport.getContainerSize().x * ZOOM_FACTOR).plus(VIEWER_PADDING);
             },
             method: 'windowToViewportCoordinates'
@@ -768,9 +764,7 @@
                 return el.times(viewer.source.dimensions.x);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(VIEWER_PADDING).times(viewport.getContainerSize().x * ZOOM_FACTOR).plus(pos_point);
             },
             method: 'viewportToWindowCoordinates'

test/modules/world.js

@@ -0,0 +1,226 @@
+/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
+
+(function() {
+    var viewer;
+
+    module('World', {
+        setup: function () {
+            var example = $('<div id="example"></div>').appendTo("#qunit-fixture");
+
+            testLog.reset();
+
+            viewer = OpenSeadragon({
+                id:            'example',
+                prefixUrl:     '/build/openseadragon/images/',
+                springStiffness: 100 // Faster animation = faster tests
+            });
+        },
+        teardown: function () {
+            if (viewer && viewer.close) {
+                viewer.close();
+            }
+
+            viewer = null;
+        }
+    });
+
+    // ----------
+    var checkBounds = function(expected, message) {
+        var bounds = viewer.world.getHomeBounds();
+        ok(bounds.equals(expected), message + ' ' + bounds.toString());
+    };
+
+    // ----------
+    asyncTest('adding a tiled image', function() {
+        ok(viewer.world, 'World exists');
+
+        viewer.world.addHandler('add-item', function(event) {
+            ok(event, 'add-item handler received event data');
+            equal(event.eventSource, viewer.world, 'sender of add-item event was world');
+            ok(event.item, 'add-item event includes item');
+            equal(viewer.world.getItemCount(), 1, 'there is now 1 item');
+            equal(event.item, viewer.world.getItemAt(0), 'item is accessible via getItemAt');
+            equal(viewer.world.getIndexOfItem(event.item), 0, 'item index is 0');
+            start();
+        });
+
+        equal(viewer.world.getItemCount(), 0, 'no items to start with');
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+    // ----------
+    asyncTest('metrics', function() {
+        viewer.addHandler('open', function(event) {
+            checkBounds(new OpenSeadragon.Rect(0, 0, 4, 4), 'bounds after open');
+
+            var expectedContentFactor = viewer.world.getItemAt(1).getContentSize().x / 2;
+            equal(viewer.world.getContentFactor(), expectedContentFactor, 'content factor has changed');
+
+            viewer.world.addHandler('metrics-change', function metricsChangeHandler(event) {
+                viewer.world.removeHandler('metrics-change', metricsChangeHandler);
+                ok(event, 'metrics-change handler received event data');
+                equal(event.eventSource, viewer.world, 'sender of metrics-change event was world');
+                checkBounds(new OpenSeadragon.Rect(0, 0, 7, 12), 'bounds after position');
+                viewer.world.getItemAt(0).setWidth(20);
+                checkBounds(new OpenSeadragon.Rect(0, 0, 20, 20), 'bounds after size');
+
+                start();
+            });
+
+            viewer.world.getItemAt(1).setPosition(new OpenSeadragon.Point(5, 10));
+        });
+
+        checkBounds(new OpenSeadragon.Rect(0, 0, 1, 1), 'default bounds');
+        equal(viewer.world.getContentFactor(), 1, 'default content factor');
+
+        viewer.open([
+            {
+                tileSource: '/test/data/testpattern.dzi',
+                width: 4
+            }, {
+                tileSource: '/test/data/testpattern.dzi',
+                width: 2
+            }
+        ]);
+    });
+
+    // ----------
+    asyncTest('remove/reorder tiled images', function() {
+        var handlerCount = 0;
+
+        viewer.addHandler('open', function(event) {
+            equal(viewer.world.getItemCount(), 3, 'there are now 3 items');
+            var item0 = viewer.world.getItemAt(0);
+            var item1 = viewer.world.getItemAt(1);
+
+            viewer.world.addHandler('item-index-change', function(event) {
+                handlerCount++;
+                ok(event, 'item-index-change handler received event data');
+                equal(event.eventSource, viewer.world, 'sender of item-index-change event was world');
+                equal(event.item, item0, 'item-index-change event includes correct item');
+                equal(event.newIndex, 1, 'item-index-change event includes correct newIndex');
+                equal(event.previousIndex, 0, 'item-index-change event includes correct previousIndex');
+                equal(viewer.world.getItemAt(0), item1, 'item1 is now at index 0');
+                equal(viewer.world.getItemAt(1), item0, 'item0 is now at index 1');
+            });
+
+            viewer.world.setItemIndex(item0, 1);
+
+            viewer.world.addHandler('remove-item', function removeHandler(event) {
+                viewer.world.removeHandler('remove-item', removeHandler);
+                handlerCount++;
+                ok(event, 'remove-item handler received event data');
+                equal(event.eventSource, viewer.world, 'sender of remove-item event was world');
+                equal(event.item, item1, 'remove-item event includes correct item');
+                equal(viewer.world.getItemCount(), 2, 'after removal, only two items remain');
+                equal(viewer.world.getItemAt(0), item0, 'item0 is now at index 0');
+            });
+
+            viewer.world.removeItem(item1);
+
+            var removeCount = 0;
+            viewer.world.addHandler('remove-item', function() {
+                removeCount++;
+                if (removeCount === 2) {
+                    handlerCount++;
+                    equal(viewer.world.getItemCount(), 0, 'after removeAll, no items remain');
+                }
+            });
+
+            viewer.world.removeAll();
+
+            equal(handlerCount, 3, 'correct number of handlers called');
+            start();
+        });
+
+        equal(viewer.world.getItemCount(), 0, 'no items to start with');
+
+        viewer.open([
+            '/test/data/testpattern.dzi',
+            '/test/data/testpattern.dzi',
+            '/test/data/testpattern.dzi'
+        ]);
+    });
+
+    // ----------
+    asyncTest('draw', function() {
+        var handlerCount = 0;
+
+        viewer.addHandler('open', function(event) {
+            equal(viewer.world.needsDraw(), true, 'needs draw after open');
+
+            viewer.addHandler('update-level', function updateHandler() {
+                viewer.removeHandler('update-level', updateHandler);
+                handlerCount++;
+            });
+
+            viewer.world.draw();
+
+            equal(handlerCount, 1, 'correct number of handlers called');
+            start();
+        });
+
+        equal(viewer.world.needsDraw(), false, 'needs no draw at first');
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+    // ----------
+    asyncTest('resetItems', function() {
+        viewer.addHandler('tile-drawn', function updateHandler() {
+            viewer.removeHandler('tile-drawn', updateHandler);
+            ok(viewer.tileCache.numTilesLoaded() > 0, 'we have tiles after tile-drawn');
+            viewer.world.resetItems();
+            equal(viewer.tileCache.numTilesLoaded(), 0, 'no tiles after reset');
+            start();
+        });
+
+        equal(viewer.tileCache.numTilesLoaded(), 0, 'no tiles at start');
+
+        viewer.open('/test/data/testpattern.dzi');
+    });
+
+    // ----------
+    asyncTest('arrange', function() {
+        viewer.addHandler('open', function(event) {
+            checkBounds(new OpenSeadragon.Rect(0, 0, 1, 1), 'all stacked');
+
+            viewer.world.arrange({
+                layout: 'horizontal',
+                rows: 1,
+                tileSize: 1,
+                tileMargin: 0.5
+            });
+
+            checkBounds(new OpenSeadragon.Rect(0, 0, 4, 1), 'one horizontal row');
+
+            viewer.world.arrange({
+                layout: 'horizontal',
+                rows: 2,
+                tileSize: 1,
+                tileMargin: 0.5
+            });
+
+            checkBounds(new OpenSeadragon.Rect(0, 0, 2.5, 2.5), 'grid');
+
+            viewer.world.arrange({
+                layout: 'vertical',
+                rows: 1,
+                tileSize: 1,
+                tileMargin: 0.5
+            });
+
+            checkBounds(new OpenSeadragon.Rect(0, 0, 1, 4), 'one vertical column');
+
+            start();
+        });
+
+        viewer.open([
+            '/test/data/testpattern.dzi',
+            '/test/data/testpattern.dzi',
+            '/test/data/testpattern.dzi'
+        ]);
+    });
+
+})();

test/test.html

@@ -5,7 +5,7 @@
     <title>OpenSeadragon QUnit</title>
     <link rel="stylesheet" href="/node_modules/qunitjs/qunit/qunit.css">
     <link rel="stylesheet" href="/test/lib/jquery-ui-1.10.2/css/smoothness/jquery-ui-1.10.2.min.css">
-    <link rel="stylesheet" href="/test/test.css">
+    <link rel="stylesheet" href="/test/helpers/test.css">
 </head>
 <body>
     <div id="qunit"></div>
@@ -14,23 +14,31 @@
     <script src="/test/lib/jquery-1.9.1.min.js"></script>
     <script src="/test/lib/jquery-ui-1.10.2/js/jquery-ui-1.10.2.min.js"></script>
     <script src="/test/lib/jquery.simulate.js"></script>
-    <script src="/build/openseadragon/openseadragon.min.js"></script>
-    <script src="/test/legacy.mouse.shim.js"></script>
-    <script src="/test/test.js"></script>
+    <script src="/build/openseadragon/openseadragon.js"></script>
+    <script src="/test/helpers/legacy.mouse.shim.js"></script>
+    <script src="/test/helpers/test.js"></script>
 
     <!-- Polyfill must be inserted first because it is testing functions
          reassignments which could be done by other test. -->
-    <script src="/test/polyfills.js"></script>
-    <script src="/test/basic.js"></script>
-    <script src="/test/navigator.js"></script>
-    <script src="/test/strings.js"></script>
-    <script src="/test/formats.js"></script>
-    <script src="/test/utils.js"></script>
-    <script src="/test/events.js"></script>
-    <script src="/test/units.js"></script>
-    <script src="/test/layers.js"></script>
-    <script src="/test/overlays.js"></script>
-    <script src="/test/controls.js"></script>
-    <script src="/test/viewport.js"></script>
+    <script src="/test/modules/polyfills.js"></script>
+    <script src="/test/modules/basic.js"></script>
+    <script src="/test/modules/strings.js"></script>
+    <script src="/test/modules/formats.js"></script>
+    <script src="/test/modules/utils.js"></script>
+    <script src="/test/modules/events.js"></script>
+    <script src="/test/modules/units.js"></script>
+    <script src="/test/modules/multi-image.js"></script>
+    <script src="/test/modules/overlays.js"></script>
+    <script src="/test/modules/controls.js"></script>
+    <script src="/test/modules/viewport.js"></script>
+    <script src="/test/modules/world.js"></script>
+    <script src="/test/modules/drawer.js"></script>
+    <script src="/test/modules/tiledimage.js"></script>
+    <script src="/test/modules/tilecache.js"></script>
+    <script src="/test/modules/referencestrip.js"></script>
+    <script src="/test/modules/tilesourcecollection.js"></script>
+    <!-- The navigator tests are the slowest (for now; hopefully they can be sped up)
+    so we put them last. -->
+    <script src="/test/modules/navigator.js"></script>
 </body>
 </html>