3f2d79b7fe
This also removes goog.events.listen, goog.events.unlisten, goog.events.unlistenByKey and goog.events.BrowserEvent.
103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
goog.provide('ol.source.ImageStatic');
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goog.require('ol.events');
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goog.require('ol.events.EventType');
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goog.require('ol.Image');
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goog.require('ol.ImageLoadFunctionType');
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goog.require('ol.ImageState');
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goog.require('ol.extent');
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goog.require('ol.proj');
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goog.require('ol.source.Image');
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/**
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* @classdesc
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* A layer source for displaying a single, static image.
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*
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* @constructor
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* @extends {ol.source.Image}
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* @param {olx.source.ImageStaticOptions} options Options.
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* @api stable
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*/
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ol.source.ImageStatic = function(options) {
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var attributions = options.attributions !== undefined ?
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options.attributions : null;
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var imageExtent = options.imageExtent;
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var crossOrigin = options.crossOrigin !== undefined ?
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options.crossOrigin : null;
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var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
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options.imageLoadFunction !== undefined ?
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options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
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goog.base(this, {
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attributions: attributions,
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logo: options.logo,
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projection: ol.proj.get(options.projection)
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});
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/**
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* @private
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* @type {ol.Image}
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*/
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this.image_ = new ol.Image(imageExtent, undefined, 1, attributions,
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options.url, crossOrigin, imageLoadFunction);
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/**
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* @private
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* @type {ol.Size}
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*/
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this.imageSize_ = options.imageSize ? options.imageSize : null;
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ol.events.listen(this.image_, ol.events.EventType.CHANGE,
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this.handleImageChange, false, this);
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};
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goog.inherits(ol.source.ImageStatic, ol.source.Image);
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/**
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* @inheritDoc
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*/
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ol.source.ImageStatic.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {
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if (ol.extent.intersects(extent, this.image_.getExtent())) {
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return this.image_;
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}
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return null;
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};
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/**
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* @inheritDoc
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*/
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ol.source.ImageStatic.prototype.handleImageChange = function(evt) {
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if (this.image_.getState() == ol.ImageState.LOADED) {
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var imageExtent = this.image_.getExtent();
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var image = this.image_.getImage();
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var imageWidth, imageHeight;
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if (this.imageSize_) {
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imageWidth = this.imageSize_[0];
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imageHeight = this.imageSize_[1];
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} else {
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imageWidth = image.width;
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imageHeight = image.height;
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}
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var resolution = ol.extent.getHeight(imageExtent) / imageHeight;
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var targetWidth = Math.ceil(ol.extent.getWidth(imageExtent) / resolution);
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if (targetWidth != imageWidth) {
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var canvas = /** @type {HTMLCanvasElement} */
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(document.createElement('canvas'));
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canvas.width = targetWidth;
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canvas.height = /** @type {number} */ (imageHeight);
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var context = canvas.getContext('2d');
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context.drawImage(image, 0, 0, imageWidth, imageHeight,
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0, 0, canvas.width, canvas.height);
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this.image_.setImage(canvas);
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}
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}
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goog.base(this, 'handleImageChange', evt);
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};
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