96 lines
2.6 KiB
JavaScript
96 lines
2.6 KiB
JavaScript
goog.provide('ol.source.ImageStatic');
|
|
|
|
goog.require('ol');
|
|
goog.require('ol.Image');
|
|
goog.require('ol.ImageState');
|
|
goog.require('ol.dom');
|
|
goog.require('ol.events');
|
|
goog.require('ol.events.EventType');
|
|
goog.require('ol.extent');
|
|
goog.require('ol.proj');
|
|
goog.require('ol.source.Image');
|
|
|
|
|
|
/**
|
|
* @classdesc
|
|
* A layer source for displaying a single, static image.
|
|
*
|
|
* @constructor
|
|
* @extends {ol.source.Image}
|
|
* @param {olx.source.ImageStaticOptions} options Options.
|
|
* @api
|
|
*/
|
|
ol.source.ImageStatic = function(options) {
|
|
var imageExtent = options.imageExtent;
|
|
|
|
var crossOrigin = options.crossOrigin !== undefined ?
|
|
options.crossOrigin : null;
|
|
|
|
var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
|
|
options.imageLoadFunction !== undefined ?
|
|
options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
|
|
|
|
ol.source.Image.call(this, {
|
|
attributions: options.attributions,
|
|
logo: options.logo,
|
|
projection: ol.proj.get(options.projection)
|
|
});
|
|
|
|
/**
|
|
* @private
|
|
* @type {ol.Image}
|
|
*/
|
|
this.image_ = new ol.Image(imageExtent, undefined, 1, options.url, crossOrigin, imageLoadFunction);
|
|
|
|
/**
|
|
* @private
|
|
* @type {ol.Size}
|
|
*/
|
|
this.imageSize_ = options.imageSize ? options.imageSize : null;
|
|
|
|
ol.events.listen(this.image_, ol.events.EventType.CHANGE,
|
|
this.handleImageChange, this);
|
|
|
|
};
|
|
ol.inherits(ol.source.ImageStatic, ol.source.Image);
|
|
|
|
|
|
/**
|
|
* @inheritDoc
|
|
*/
|
|
ol.source.ImageStatic.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {
|
|
if (ol.extent.intersects(extent, this.image_.getExtent())) {
|
|
return this.image_;
|
|
}
|
|
return null;
|
|
};
|
|
|
|
|
|
/**
|
|
* @inheritDoc
|
|
*/
|
|
ol.source.ImageStatic.prototype.handleImageChange = function(evt) {
|
|
if (this.image_.getState() == ol.ImageState.LOADED) {
|
|
var imageExtent = this.image_.getExtent();
|
|
var image = this.image_.getImage();
|
|
var imageWidth, imageHeight;
|
|
if (this.imageSize_) {
|
|
imageWidth = this.imageSize_[0];
|
|
imageHeight = this.imageSize_[1];
|
|
} else {
|
|
imageWidth = image.width;
|
|
imageHeight = image.height;
|
|
}
|
|
var resolution = ol.extent.getHeight(imageExtent) / imageHeight;
|
|
var targetWidth = Math.ceil(ol.extent.getWidth(imageExtent) / resolution);
|
|
if (targetWidth != imageWidth) {
|
|
var context = ol.dom.createCanvasContext2D(targetWidth, imageHeight);
|
|
var canvas = context.canvas;
|
|
context.drawImage(image, 0, 0, imageWidth, imageHeight,
|
|
0, 0, canvas.width, canvas.height);
|
|
this.image_.setImage(canvas);
|
|
}
|
|
}
|
|
ol.source.Image.prototype.handleImageChange.call(this, evt);
|
|
};
|