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Merge pull request #644 from avandecreme/opacity

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Add opacity support.
This commit is contained in:
Ian Gilman 2015-04-29 09:58:12 -07:00
commit 019d82a4d9
7 changed files with 299 additions and 112 deletions
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224
src/drawer.js
View File

@ -42,11 +42,9 @@
* @param {OpenSeadragon.Viewer} options.viewer - The Viewer that owns this Drawer.
* @param {OpenSeadragon.Viewport} options.viewport - Reference to Viewer viewport.
* @param {Element} options.element - Parent element.
* @param {Number} [options.opacity=1] - See opacity in {@link OpenSeadragon.Options} for details.
* @param {Number} [options.debugGridColor] - See debugGridColor in {@link OpenSeadragon.Options} for details.
*/
$.Drawer = function( options ) {
var _this = this;
$.console.assert( options.viewer, "[Drawer] options.viewer is required" );
@ -72,7 +70,9 @@ $.Drawer = function( options ) {
this.viewer = options.viewer;
this.viewport = options.viewport;
this.debugGridColor = options.debugGridColor || $.DEFAULT_SETTINGS.debugGridColor;
this.opacity = options.opacity === undefined ? $.DEFAULT_SETTINGS.opacity : options.opacity;
if (options.opacity) {
$.console.error( "[Drawer] options.opacity is no longer accepted; set the opacity on the TiledImage instead" );
}
this.useCanvas = $.supportsCanvas && ( this.viewer ? this.viewer.useCanvas : true );
/**
@ -96,6 +96,13 @@ $.Drawer = function( options ) {
*/
this.context = this.useCanvas ? this.canvas.getContext( "2d" ) : null;
/**
* Sketch canvas used to temporarily draw tiles which cannot be drawn directly
* to the main canvas due to opacity. Lazily initialized.
*/
this.sketchCanvas = null;
this.sketchContext = null;
/**
* @member {Element} element
* @memberof OpenSeadragon.Drawer#
@ -160,8 +167,11 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
* @return {OpenSeadragon.Drawer} Chainable.
*/
setOpacity: function( opacity ) {
this.opacity = opacity;
$.setElementOpacity( this.canvas, this.opacity, true );
$.console.error("drawer.setOpacity is deprecated. Use tiledImage.setOpacity instead.");
var world = this.viewer.world;
for (var i = 0; i < world.getItemCount(); i++) {
world.getItemAt( i ).setOpacity( opacity );
}
return this;
},
@ -170,7 +180,16 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
* @returns {Number}
*/
getOpacity: function() {
return this.opacity;
$.console.error("drawer.getOpacity is deprecated. Use tiledImage.getOpacity instead.");
var world = this.viewer.world;
var maxOpacity = 0;
for (var i = 0; i < world.getItemCount(); i++) {
var opacity = world.getItemAt( i ).getOpacity();
if ( opacity > maxOpacity ) {
maxOpacity = opacity;
}
}
return maxOpacity;
},
// deprecated
@ -214,6 +233,8 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
//force unloading of current canvas (1x1 will be gc later, trick not necessarily needed)
this.canvas.width = 1;
this.canvas.height = 1;
this.sketchCanvas = null;
this.sketchContext = null;
},
/**
@ -227,11 +248,24 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
this.canvas.height != viewportSize.y ) {
this.canvas.width = viewportSize.x;
this.canvas.height = viewportSize.y;
if ( this.sketchCanvas !== null ) {
this.sketchCanvas.width = this.canvas.width;
this.sketchCanvas.height = this.canvas.height;
}
}
this.context.clearRect( 0, 0, viewportSize.x, viewportSize.y );
this._clear();
}
},
_clear: function ( useSketch ) {
if ( !this.useCanvas ) {
return;
}
var context = this._getContext( useSketch );
var canvas = context.canvas;
context.clearRect( 0, 0, canvas.width, canvas.height );
},
/**
* Translates from OpenSeadragon viewer rectangle to drawer rectangle.
* @param {OpenSeadragon.Rect} rectangle - The rectangle in viewport coordinate system.
@ -254,65 +288,99 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
* @param {OpenSeadragon.Tile} tile - The tile to draw.
* @param {Function} drawingHandler - Method for firing the drawing event if using canvas.
* drawingHandler({context, tile, rendered})
* @param {Boolean} useSketch - Whether to use the sketch canvas or not.
* where <code>rendered</code> is the context with the pre-drawn image.
*/
drawTile: function( tile, drawingHandler ) {
drawTile: function( tile, drawingHandler, useSketch ) {
$.console.assert(tile, '[Drawer.drawTile] tile is required');
$.console.assert(drawingHandler, '[Drawer.drawTile] drawingHandler is required');
if ( this.useCanvas ) {
var context = this._getContext( useSketch );
// TODO do this in a more performant way
// specifically, don't save,rotate,restore every time we draw a tile
if( this.viewport.degrees !== 0 ) {
this._offsetForRotation( tile, this.viewport.degrees );
tile.drawCanvas( this.context, drawingHandler );
this._restoreRotationChanges( tile );
this._offsetForRotation( tile, this.viewport.degrees, useSketch );
tile.drawCanvas( context, drawingHandler );
this._restoreRotationChanges( tile, useSketch );
} else {
tile.drawCanvas( this.context, drawingHandler );
tile.drawCanvas( context, drawingHandler );
}
} else {
tile.drawHTML( this.canvas );
}
},
_getContext: function( useSketch ) {
var context = this.context;
if ( useSketch ) {
if (this.sketchCanvas === null) {
this.sketchCanvas = document.createElement( "canvas" );
this.sketchCanvas.width = this.canvas.width;
this.sketchCanvas.height = this.canvas.height;
this.sketchContext = this.sketchCanvas.getContext( "2d" );
}
context = this.sketchContext;
}
return context;
},
// private
saveContext: function() {
saveContext: function( useSketch ) {
if (!this.useCanvas) {
return;
}
this._getContext( useSketch ).save();
},
// private
restoreContext: function( useSketch ) {
if (!this.useCanvas) {
return;
}
this._getContext( useSketch ).restore();
},
// private
setClip: function(rect, useSketch) {
if (!this.useCanvas) {
return;
}
var context = this._getContext( useSketch );
context.beginPath();
context.rect(rect.x, rect.y, rect.width, rect.height);
context.clip();
},
// private
drawRectangle: function(rect, fillStyle, useSketch) {
if (!this.useCanvas) {
return;
}
var context = this._getContext( useSketch );
context.save();
context.fillStyle = fillStyle;
context.fillRect(rect.x, rect.y, rect.width, rect.height);
context.restore();
},
/**
* Blends the sketch canvas in the main canvas.
* @param {Float} opacity The opacity of the blending.
* @returns {undefined}
*/
blendSketch: function(opacity) {
if (!this.useCanvas || !this.sketchCanvas) {
return;
}
this.context.save();
},
// private
restoreContext: function() {
if (!this.useCanvas) {
return;
}
this.context.restore();
},
// private
setClip: function(rect) {
if (!this.useCanvas) {
return;
}
this.context.beginPath();
this.context.rect(rect.x, rect.y, rect.width, rect.height);
this.context.clip();
},
// private
drawRectangle: function(rect, fillStyle) {
if (!this.useCanvas) {
return;
}
this.context.save();
this.context.fillStyle = fillStyle;
this.context.fillRect(rect.x, rect.y, rect.width, rect.height);
this.context.globalAlpha = opacity;
this.context.drawImage(this.sketchCanvas, 0, 0);
this.context.restore();
},
@ -322,17 +390,18 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
return;
}
this.context.save();
this.context.lineWidth = 2 * $.pixelDensityRatio;
this.context.font = 'small-caps bold ' + (13 * $.pixelDensityRatio) + 'px arial';
this.context.strokeStyle = this.debugGridColor;
this.context.fillStyle = this.debugGridColor;
var context = this.context;
context.save();
context.lineWidth = 2 * $.pixelDensityRatio;
context.font = 'small-caps bold ' + (13 * $.pixelDensityRatio) + 'px arial';
context.strokeStyle = this.debugGridColor;
context.fillStyle = this.debugGridColor;
if ( this.viewport.degrees !== 0 ) {
this._offsetForRotation( tile, this.canvas, this.context, this.viewport.degrees );
this._offsetForRotation( tile, this.viewport.degrees );
}
this.context.strokeRect(
context.strokeRect(
tile.position.x * $.pixelDensityRatio,
tile.position.y * $.pixelDensityRatio,
tile.size.x * $.pixelDensityRatio,
@ -343,95 +412,97 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
var tileCenterY = (tile.position.y + (tile.size.y / 2)) * $.pixelDensityRatio;
// Rotate the text the right way around.
this.context.translate( tileCenterX, tileCenterY );
this.context.rotate( Math.PI / 180 * -this.viewport.degrees );
this.context.translate( -tileCenterX, -tileCenterY );
context.translate( tileCenterX, tileCenterY );
context.rotate( Math.PI / 180 * -this.viewport.degrees );
context.translate( -tileCenterX, -tileCenterY );
if( tile.x === 0 && tile.y === 0 ){
this.context.fillText(
context.fillText(
"Zoom: " + this.viewport.getZoom(),
tile.position.x * $.pixelDensityRatio,
(tile.position.y - 30) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Pan: " + this.viewport.getBounds().toString(),
tile.position.x * $.pixelDensityRatio,
(tile.position.y - 20) * $.pixelDensityRatio
);
}
this.context.fillText(
context.fillText(
"Level: " + tile.level,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 20) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Column: " + tile.x,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 30) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Row: " + tile.y,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 40) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Order: " + i + " of " + count,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 50) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Size: " + tile.size.toString(),
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 60) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Position: " + tile.position.toString(),
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 70) * $.pixelDensityRatio
);
if ( this.viewport.degrees !== 0 ) {
this._restoreRotationChanges( tile, this.canvas, this.context );
this._restoreRotationChanges( tile );
}
this.context.restore();
context.restore();
},
// private
debugRect: function(rect) {
if ( this.useCanvas ) {
this.context.save();
this.context.lineWidth = 2 * $.pixelDensityRatio;
this.context.strokeStyle = this.debugGridColor;
this.context.fillStyle = this.debugGridColor;
var context = this.context;
context.save();
context.lineWidth = 2 * $.pixelDensityRatio;
context.strokeStyle = this.debugGridColor;
context.fillStyle = this.debugGridColor;
this.context.strokeRect(
context.strokeRect(
rect.x * $.pixelDensityRatio,
rect.y * $.pixelDensityRatio,
rect.width * $.pixelDensityRatio,
rect.height * $.pixelDensityRatio
);
this.context.restore();
context.restore();
}
},
// private
_offsetForRotation: function( tile, degrees ){
_offsetForRotation: function( tile, degrees, useSketch ){
var cx = this.canvas.width / 2,
cy = this.canvas.height / 2,
px = tile.position.x - cx,
py = tile.position.y - cy;
this.context.save();
var context = this._getContext( useSketch );
context.save();
this.context.translate(cx, cy);
this.context.rotate( Math.PI / 180 * degrees);
context.translate(cx, cy);
context.rotate( Math.PI / 180 * degrees);
tile.position.x = px;
tile.position.y = py;
},
// private
_restoreRotationChanges: function( tile ){
_restoreRotationChanges: function( tile, useSketch ){
var cx = this.canvas.width / 2,
cy = this.canvas.height / 2,
px = tile.position.x + cx,
@ -440,7 +511,8 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
tile.position.x = px;
tile.position.y = py;
this.context.restore();
var context = this._getContext( useSketch );
context.restore();
},
// private

2
src/openseadragon.js
View File

@ -204,7 +204,7 @@
* If 0, adjusts to fit viewer.
*
* @property {Number} [opacity=1]
* Opacity of the drawer (1=opaque, 0=transparent)
* Default opacity of the tiled images (1=opaque, 0=transparent)
*
* @property {String|CanvasGradient|CanvasPattern|Function} [placeholderFillStyle=null]
* Draws a colored rectangle behind the tile if it is not loaded yet.

2
src/tile.js
View File

@ -67,7 +67,7 @@ $.Tile = function(level, x, y, bounds, exists, url) {
this.y = y;
/**
* Where this tile fits, in normalized coordinates
* @member {OpenSeadragon.Point} bounds
* @member {OpenSeadragon.Rect} bounds
* @memberof OpenSeadragon.Tile#
*/
this.bounds = bounds;

71
src/tiledimage.js
View File

@ -64,6 +64,7 @@
* @param {Number} [options.blendTime] - See {@link OpenSeadragon.Options}.
* @param {Boolean} [options.alwaysBlend] - See {@link OpenSeadragon.Options}.
* @param {Number} [options.minPixelRatio] - See {@link OpenSeadragon.Options}.
* @param {Number} [options.opacity=1] - Opacity the tiled image should be drawn at.
* @param {Boolean} [options.debugMode] - See {@link OpenSeadragon.Options}.
* @param {String|CanvasGradient|CanvasPattern|Function} [options.placeholderFillStyle] - See {@link OpenSeadragon.Options}.
* @param {String|Boolean} [options.crossOriginPolicy] - See {@link OpenSeadragon.Options}.
@ -142,7 +143,8 @@ $.TiledImage = function( options ) {
minPixelRatio: $.DEFAULT_SETTINGS.minPixelRatio,
debugMode: $.DEFAULT_SETTINGS.debugMode,
crossOriginPolicy: $.DEFAULT_SETTINGS.crossOriginPolicy,
placeholderFillStyle: $.DEFAULT_SETTINGS.placeholderFillStyle
placeholderFillStyle: $.DEFAULT_SETTINGS.placeholderFillStyle,
opacity: $.DEFAULT_SETTINGS.opacity
}, options );
@ -486,6 +488,21 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
this._needsDraw = true;
},
/**
* @returns {Number} The TiledImage's current opacity.
*/
getOpacity: function() {
return this.opacity;
},
/**
* @param {Number} opacity Opacity the tiled image should be drawn at.
*/
setOpacity: function(opacity) {
this.opacity = opacity;
this._needsDraw = true;
},
// private
_setScale: function(scale, immediately) {
var sameTarget = (this._scaleSpring.target.value === scale);
@ -1152,20 +1169,24 @@ function compareTiles( previousBest, tile ) {
function drawTiles( tiledImage, lastDrawn ) {
var i,
tile,
tileKey,
viewer,
viewport,
position,
tileSource;
tile;
if ( tiledImage.opacity <= 0 ) {
drawDebugInfo( tiledImage, lastDrawn );
return;
}
var useSketch = tiledImage.opacity < 1;
if ( useSketch ) {
tiledImage._drawer._clear( true );
}
var usedClip = false;
if ( tiledImage._clip ) {
tiledImage._drawer.saveContext();
tiledImage._drawer.saveContext(useSketch);
var box = tiledImage.imageToViewportRectangle(tiledImage._clip, true);
var clipRect = tiledImage._drawer.viewportToDrawerRectangle(box);
tiledImage._drawer.setClip(clipRect);
tiledImage._drawer.setClip(clipRect, useSketch);
usedClip = true;
}
@ -1181,22 +1202,14 @@ function drawTiles( tiledImage, lastDrawn ) {
fillStyle = tiledImage.placeholderFillStyle;
}
tiledImage._drawer.drawRectangle(placeholderRect, fillStyle);
tiledImage._drawer.drawRectangle(placeholderRect, fillStyle, useSketch);
}
for ( i = lastDrawn.length - 1; i >= 0; i-- ) {
tile = lastDrawn[ i ];
tiledImage._drawer.drawTile( tile, tiledImage._drawingHandler );
tiledImage._drawer.drawTile( tile, tiledImage._drawingHandler, useSketch );
tile.beingDrawn = true;
if( tiledImage.debugMode ) {
try {
tiledImage._drawer.drawDebugInfo( tile, lastDrawn.length, i );
} catch(e) {
$.console.error(e);
}
}
if( tiledImage.viewer ){
/**
* <em>- Needs documentation -</em>
@ -1217,7 +1230,25 @@ function drawTiles( tiledImage, lastDrawn ) {
}
if ( usedClip ) {
tiledImage._drawer.restoreContext();
tiledImage._drawer.restoreContext( useSketch );
}
if ( useSketch ) {
tiledImage._drawer.blendSketch( tiledImage.opacity );
}
drawDebugInfo( tiledImage, lastDrawn );
}
function drawDebugInfo( tiledImage, lastDrawn ) {
if( tiledImage.debugMode ) {
for ( var i = lastDrawn.length - 1; i >= 0; i-- ) {
var tile = lastDrawn[ i ];
try {
tiledImage._drawer.drawDebugInfo( tile, lastDrawn.length, i );
} catch(e) {
$.console.error(e);
}
}
}
}

6
src/viewer.js
View File

@ -374,7 +374,6 @@ $.Viewer = function( options ) {
viewer: this,
viewport: this.viewport,
element: this.canvas,
opacity: this.opacity,
debugGridColor: this.debugGridColor
});
@ -1198,6 +1197,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
* @param {OpenSeadragon.Rect} [options.clip] - An area, in image pixels, to clip to
* (portions of the image outside of this area will not be visible). Only works on
* browsers that support the HTML5 canvas.
* @param {Number} [options.opacity] Opacity the tiled image should be drawn at by default.
* @param {Function} [options.success] A function that gets called when the image is
* successfully added. It's passed the event object which contains a single property:
* "item", the resulting TiledImage.
@ -1221,6 +1221,9 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
if (options.placeholderFillStyle === undefined) {
options.placeholderFillStyle = this.placeholderFillStyle;
}
if (options.opacity === undefined) {
options.opacity = this.opacity;
}
var myQueueItem = {
options: options
@ -1290,6 +1293,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
height: queueItem.options.height,
clip: queueItem.options.clip,
placeholderFillStyle: queueItem.options.placeholderFillStyle,
opacity: queueItem.options.opacity,
springStiffness: _this.springStiffness,
animationTime: _this.animationTime,
minZoomImageRatio: _this.minZoomImageRatio,

69
test/modules/drawer.js
View File

@ -33,9 +33,6 @@
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();
});
@ -67,18 +64,64 @@
});
});
// ----------
asyncTest('sketchCanvas', function() {
createViewer({
tileSources: '/test/data/testpattern.dzi'
});
var drawer = viewer.drawer;
viewer.addHandler('tile-drawn', function noOpacityHandler() {
viewer.removeHandler('tile-drawn', noOpacityHandler);
equal(drawer.sketchCanvas, null,
'The sketch canvas should be null if no decimal opacity is used.');
equal(drawer.sketchContext, null,
'The sketch context should be null if no decimal opacity is used.');
testOpacityDecimal();
});
function testOpacityDecimal() {
var tiledImage;
viewer.addTiledImage({
tileSource: '/test/data/testpattern.dzi',
opacity: 0.5,
success: function(event) {
tiledImage = event.item;
}
});
viewer.addHandler('tile-drawn', function opacityDecimalHandler(event) {
if (tiledImage !== event.tiledImage) {
return;
}
viewer.removeHandler('tile-drawn', opacityDecimalHandler);
notEqual(drawer.sketchCanvas, null,
'The sketch canvas should not be null once a decimal opacity has been used.');
notEqual(drawer.sketchContext, null,
'The sketch context should not be null once a decimal opacity has been used.');
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();
createViewer({
tileSources: '/test/data/testpattern.dzi'
});
viewer.world.addHandler('add-item', function() {
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');
Util.testDeprecation(viewer.drawer, 'setOpacity', viewer.world.getItemAt(0), 'setOpacity');
Util.testDeprecation(viewer.drawer, 'getOpacity', viewer.world.getItemAt(0), 'getOpacity');
start();
});
});
})();

37
test/modules/tiledimage.js
View File

@ -220,4 +220,41 @@
});
});
// ----------
asyncTest('opacity', function() {
function testDefaultOpacity() {
viewer.removeHandler('open', testDefaultOpacity);
var image = viewer.world.getItemAt(0);
strictEqual(image.getOpacity(), 0.5, 'image has default opacity');
image.setOpacity(1);
strictEqual(image.getOpacity(), 1, 'opacity is set correctly');
viewer.addHandler('open', testTileSourceOpacity);
viewer.open({
tileSource: '/test/data/testpattern.dzi',
opacity: 0.25
});
}
function testTileSourceOpacity() {
viewer.removeHandler('open', testTileSourceOpacity);
var image = viewer.world.getItemAt(0);
strictEqual(image.getOpacity(), 0.25, 'image has correct opacity');
image.setOpacity(0);
strictEqual(image.getOpacity(), 0, 'opacity is set correctly');
start();
}
viewer.addHandler('open', testDefaultOpacity);
viewer.opacity = 0.5;
viewer.open({
tileSource: '/test/data/testpattern.dzi',
});
});
})();