72 lines
1.8 KiB
JavaScript
72 lines
1.8 KiB
JavaScript
goog.provide('ol.source.SingleImageWMS');
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goog.require('ol.Image');
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goog.require('ol.ImageUrlFunction');
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goog.require('ol.Size');
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goog.require('ol.extent');
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goog.require('ol.source.ImageSource');
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goog.require('ol.source.wms');
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/**
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* @constructor
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* @extends {ol.source.ImageSource}
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* @param {ol.source.SingleImageWMSOptions} options Options.
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*/
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ol.source.SingleImageWMS = function(options) {
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var imageUrlFunction = goog.isDef(options.url) ?
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ol.ImageUrlFunction.createFromParamsFunction(
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options.url, options.params, ol.source.wms.getUrl) :
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ol.ImageUrlFunction.nullImageUrlFunction;
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goog.base(this, {
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attributions: options.attributions,
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crossOrigin: options.crossOrigin,
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extent: options.extent,
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projection: options.projection,
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resolutions: options.resolutions,
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imageUrlFunction: imageUrlFunction
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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_ = null;
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/**
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* @private
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* @type {number}
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*/
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this.ratio_ = goog.isDef(options.ratio) ?
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options.ratio : 1.5;
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};
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goog.inherits(ol.source.SingleImageWMS, ol.source.ImageSource);
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/**
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* @inheritDoc
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*/
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ol.source.SingleImageWMS.prototype.getImage =
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function(extent, resolution, projection) {
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resolution = this.findNearestResolution(resolution);
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var image = this.image_;
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if (!goog.isNull(image) &&
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image.getResolution() == resolution &&
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ol.extent.containsExtent(image.getExtent(), extent)) {
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return image;
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}
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extent = extent.slice();
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ol.extent.scaleFromCenter(extent, this.ratio_);
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var width = (extent[1] - extent[0]) / resolution;
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var height = (extent[3] - extent[2]) / resolution;
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var size = new ol.Size(width, height);
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this.image_ = this.createImage(extent, resolution, size, projection);
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return this.image_;
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};
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