goog.provide('ol.source.ImageStatic');
goog.require('goog.events');
goog.require('goog.events.EventType');
goog.require('ol.Image');
goog.require('ol.ImageLoadFunctionType');
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 stable
*/
ol.source.ImageStatic = function(options) {
var attributions = options.attributions !== undefined ?
options.attributions : null;
var imageExtent = options.imageExtent;
var xResolution, yResolution, resolutions, imgResolution;
if (options.imageSize !== undefined) {
xResolution = ol.extent.getWidth(imageExtent) / options.imageSize[0];
yResolution = ol.extent.getHeight(imageExtent) / options.imageSize[1];
imgResolution = [xResolution, yResolution];
resolutions = [yResolution];
}
var crossOrigin = options.crossOrigin !== undefined ?
options.crossOrigin : null;
var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
options.imageLoadFunction !== undefined ?
options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
goog.base(this, {
attributions: attributions,
logo: options.logo,
projection: ol.proj.get(options.projection),
resolutions: resolutions
});
/**
* @private
* @type {ol.Image}
*/
this.image_ = new ol.Image(imageExtent, imgResolution, 1,
attributions, options.url, crossOrigin, imageLoadFunction);
goog.events.listen(this.image_, goog.events.EventType.CHANGE,
this.handleImageChange, false, this);
};
goog.inherits(ol.source.ImageStatic, ol.source.Image);
/**
* @inheritDoc
*/
ol.source.ImageStatic.prototype.getImageInternal =
function(extent, resolution, pixelRatio, projection) {
Eif (ol.extent.intersects(extent, this.image_.getExtent())) {
return this.image_;
}
return null;
};
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