97 lines
2.7 KiB
JavaScript
97 lines
2.7 KiB
JavaScript
/**
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* @module ol/source/ImageStatic
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*/
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import {inherits} from '../index.js';
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import _ol_Image_ from '../Image.js';
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import ImageState from '../ImageState.js';
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import {createCanvasContext2D} from '../dom.js';
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import _ol_events_ from '../events.js';
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import EventType from '../events/EventType.js';
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import {intersects, getHeight, getWidth} from '../extent.js';
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import {get as getProjection} from '../proj.js';
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import _ol_source_Image_ from '../source/Image.js';
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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
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*/
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var _ol_source_ImageStatic_ = function(options) {
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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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_ol_source_Image_.call(this, {
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attributions: options.attributions,
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projection: getProjection(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, 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_, EventType.CHANGE,
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this.handleImageChange, this);
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};
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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 (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() == 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 = getHeight(imageExtent) / imageHeight;
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var targetWidth = Math.ceil(getWidth(imageExtent) / resolution);
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if (targetWidth != imageWidth) {
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var context = createCanvasContext2D(targetWidth, imageHeight);
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var canvas = context.canvas;
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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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_ol_source_Image_.prototype.handleImageChange.call(this, evt);
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};
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export default _ol_source_ImageStatic_;
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