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Merge pull request #1772 from zero41120/feature/1540-cropping-with-multiple-polygons
Feature/1540 cropping with multiple polygons
This commit is contained in:
Ian Gilman
GitHub
commit
17cabdb923
@ -166,6 +166,41 @@ $.Drawer.prototype = {
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return this;
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},
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/**
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* This function converts the given point from to the drawer coordinate by
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* multiplying it with the pixel density.
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* This function does not take rotation into account, thus assuming provided
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* point is at 0 degree.
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* @param {OpenSeadragon.Point} point - the pixel point to convert
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*/
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viewportCoordToDrawerCoord: function(point) {
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var vpPoint = this.viewport.pixelFromPointNoRotate(point, true);
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return new $.Point(
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vpPoint.x * $.pixelDensityRatio,
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vpPoint.y * $.pixelDensityRatio
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);
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},
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/**
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* This function will create multiple polygon paths on the drawing context by provided polygons,
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* then clip the context to the paths.
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* @param {(OpenSeadragon.Point[])[]} polygons - an array of polygons. A polygon is an array of OpenSeadragon.Point
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* @param {Boolean} useSketch - Whether to use the sketch canvas or not.
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*/
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clipWithPolygons: function (polygons, useSketch) {
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if (!this.useCanvas) {
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return;
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}
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var context = this._getContext(useSketch);
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context.beginPath();
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polygons.forEach(function (polygon) {
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polygon.forEach(function (coord, i) {
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context[i === 0 ? 'moveTo' : 'lineTo'](coord.x, coord.y);
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});
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});
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context.clip();
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},
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/**
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* Set the opacity of the drawer.
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* @param {Number} opacity
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@ -674,6 +674,58 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
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this._setScale(height / this.normHeight, immediately);
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},
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/**
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* Sets an array of polygons to crop the TiledImage during draw tiles.
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* The render function will use the default non-zero winding rule.
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* @param Polygons represented in an array of point object in image coordinates.
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* Example format: [
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* [{x: 197, y:172}, {x: 226, y:172}, {x: 226, y:198}, {x: 197, y:198}], // First polygon
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* [{x: 328, y:200}, {x: 330, y:199}, {x: 332, y:201}, {x: 329, y:202}] // Second polygon
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* [{x: 321, y:201}, {x: 356, y:205}, {x: 341, y:250}] // Third polygon
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* ]
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*/
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setCroppingPolygons: function( polygons ) {
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var isXYObject = function(obj) {
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return obj instanceof $.Point || (typeof obj.x === 'number' && typeof obj.y === 'number');
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};
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var objectToSimpleXYObject = function(objs) {
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return objs.map(function(obj) {
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try {
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if (isXYObject(obj)) {
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return { x: obj.x, y: obj.y };
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} else {
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throw new Error();
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}
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} catch(e) {
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throw new Error('A Provided cropping polygon point is not supported');
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}
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});
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};
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try {
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if (!$.isArray(polygons)) {
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throw new Error('Provided cropping polygon is not an array');
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}
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this._croppingPolygons = polygons.map(function(polygon){
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return objectToSimpleXYObject(polygon);
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});
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} catch (e) {
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$.console.error('[TiledImage.setCroppingPolygons] Cropping polygon format not supported');
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$.console.error(e);
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this._croppingPolygons = null;
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}
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},
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/**
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* Resets the cropping polygons, thus next render will remove all cropping
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* polygon effects.
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*/
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resetCroppingPolygons: function() {
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this._croppingPolygons = null;
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},
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/**
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* Positions and scales the TiledImage to fit in the specified bounds.
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* Note: this method fires OpenSeadragon.TiledImage.event:bounds-change
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@ -1932,6 +1984,28 @@ function drawTiles( tiledImage, lastDrawn ) {
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usedClip = true;
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}
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if (tiledImage._croppingPolygons) {
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tiledImage._drawer.saveContext(useSketch);
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try {
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var polygons = tiledImage._croppingPolygons.map(function (polygon) {
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return polygon.map(function (coord) {
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var point = tiledImage
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.imageToViewportCoordinates(coord.x, coord.y, true)
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.rotate(-tiledImage.getRotation(true), tiledImage._getRotationPoint(true));
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var clipPoint = tiledImage._drawer.viewportCoordToDrawerCoord(point);
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if (sketchScale) {
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clipPoint = clipPoint.times(sketchScale);
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}
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return clipPoint;
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});
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});
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tiledImage._drawer.clipWithPolygons(polygons, useSketch);
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} catch (e) {
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$.console.error(e);
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}
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usedClip = true;
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}
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if ( tiledImage.placeholderFillStyle && tiledImage._hasOpaqueTile === false ) {
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var placeholderRect = tiledImage._drawer.viewportToDrawerRectangle(tiledImage.getBounds(true));
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if (sketchScale) {
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165
test/demo/cropping-polygons.html
Normal file
165
test/demo/cropping-polygons.html
Normal file
@ -0,0 +1,165 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>OpenSeadragon Cropping PolygonList Demo</title>
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<script type="text/javascript" src='../../build/openseadragon/openseadragon.js'></script>
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<script type="text/javascript" src='../lib/jquery-1.9.1.min.js'></script>
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<style type="text/css">
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.openseadragon1 {
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width: 800px;
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height: 600px;
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background: lightgreen;
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}
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textarea {
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width: 215px;
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height: 200px;
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}
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.box-with-title {
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padding-top: 1em;
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display: inline-block;
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text-align: center;
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}
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.buttons {
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width: 215px;
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}
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*:focus {
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outline: none;
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}
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</style>
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</head>
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<body>
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<h3>
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Simple demo page to show cropping with polygonList in a OpenSeadragon viewer.
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</h3>
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<div id="contentDiv" class="openseadragon1"></div>
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<span>Click on Viewer to save polygon points</span>
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<div>
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<button id='resetBtn'>Reset</button>
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<button id='exampleBtn'>Load Example</button>
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</div>
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<div class='box-with-title'>
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<div class="buttons">
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<button id="addPointBtn">Add Points as Polygon</button>
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<button onclick="emptyElement('polygonPointEl')">Clear</button>
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</div>
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<textarea id="polygonPointEl"></textarea>
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</div>
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<div class='box-with-title'>
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<div class="buttons">
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<button id="cropBtn">Crop With Polygon</button>
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<button onclick="emptyElement('previewEl')">Clear</button>
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</div>
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<textarea id='previewEl'></textarea>
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</div>
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<!-- Setup Viewer -->
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<script type="text/javascript">
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var viewer = OpenSeadragon({
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// debugMode: true,
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id: "contentDiv",
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prefixUrl: "../../build/openseadragon/images/",
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tileSources: "../data/testpattern.dzi",
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showNavigator: false,
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gestureSettingsMouse: {
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clickToZoom: false
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}
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});
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</script>
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<script>
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// Global Variables
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var previewEl = document.getElementById('previewEl');
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var polygonPointEl = document.getElementById('polygonPointEl');
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var examples = [
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[{x: 480, y: 300},{x: 300, y: 420},{x: 600, y: 420}], // Triangle
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[{x: 300, y: 550},{x: 300, y: 750},{x: 600, y: 750},{x: 600, y: 550}] // Rectangle
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];
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// Load default examples
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function loadExample(){
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previewEl.value = JSON.stringify(examples);
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}
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loadExample();
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// Set a given element's value to empty string
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function emptyElement(elementId) {
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document.getElementById(elementId).value = '';
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}
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// JSON parse a given object, then insert object assuming parsed value is array.
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function insertObjectToElement(object, element) {
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var parsed = []; // Default to empty array
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try {
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parsed = JSON.parse(element.value);
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} catch(error) { }
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parsed.push(object);
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element.value = JSON.stringify(parsed)
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}
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// Add click handler to clicked point tracker
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viewer.addHandler('canvas-click', function(event) {
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var viewportPoint = viewer.viewport.pointFromPixel(event.position);
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var p = viewer.viewport.viewportToImageCoordinates(viewportPoint);
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p.x = Math.round((p.x + Number.EPSILON) * 100) / 100
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p.y = Math.round((p.y + Number.EPSILON) * 100) / 100
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insertObjectToElement({x:p.x, y:p.y}, polygonPointEl);
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});
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// Evaluate give element in JavaScript variable, default to empty array.
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function readElementValueDefaultToEmptyArray(elementId) {
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try {
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var val = document.getElementById(elementId).value;
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if (val === '') { return []; }
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return eval(val); // If using JSON.parse, user must put quotes [{"x": 123, "y":12}]
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} catch (e) {
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return [];
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}
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}
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// Insert value from given element into preview element
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function insertValueFromElementToPreviewElement(element) {
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try {
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if (element.value === '') { return; }
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var polygon = eval(element.value);
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var polygonList = readElementValueDefaultToEmptyArray('previewEl');
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polygonList.push(polygon);
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element.value = '';
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previewEl.value = JSON.stringify(polygonList);
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} catch(error) {
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console.log(error);
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}
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}
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// Add clicked points to polygon tracker variable as point objects
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document.getElementById('addPointBtn').onclick = function(){
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insertValueFromElementToPreviewElement(polygonPointEl);
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};
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// Crop image with value in the preview element
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document.getElementById('cropBtn').onclick = function(){
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var polygonList = eval(previewEl.value);
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var tiledImage = viewer.world.getItemAt(0);
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tiledImage.setCroppingPolygons(polygonList);
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viewer.forceRedraw();
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emptyElement('previewEl');
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};
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document.getElementById('resetBtn').onclick = function(){
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emptyElement('polygonPointEl');
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emptyElement('previewEl');
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var tiledImage = viewer.world.getItemAt(0);
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tiledImage.resetCroppingPolygons();
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viewer.forceRedraw();
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};
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document.getElementById('exampleBtn').onclick = loadExample;
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</script>
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</body>
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</html>
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