102 lines
2.3 KiB
JavaScript
102 lines
2.3 KiB
JavaScript
goog.provide('ol.source.ImageWMS');
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goog.require('goog.asserts');
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goog.require('goog.object');
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goog.require('ol.Image');
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goog.require('ol.ImageUrlFunction');
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goog.require('ol.extent');
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goog.require('ol.source.Image');
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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.Image}
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* @param {ol.source.ImageWMSOptions} options Options.
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* @todo stability experimental
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*/
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ol.source.ImageWMS = function(options) {
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/**
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* @private
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* @type {Object}
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*/
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this.params_ = options.params;
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var imageUrlFunction = goog.isDef(options.url) ?
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ol.ImageUrlFunction.createFromParamsFunction(
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options.url, this.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.ImageWMS, ol.source.Image);
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/**
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* Get the user-provided params, i.e. those passed to the constructor through
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* the "params" option, and possibly updated using the updateParams method.
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* @return {Object} Params.
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*/
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ol.source.ImageWMS.prototype.getParams = function() {
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return this.params_;
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};
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/**
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* @inheritDoc
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*/
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ol.source.ImageWMS.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[2] - extent[0]) / resolution;
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var height = (extent[3] - extent[1]) / resolution;
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var 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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/**
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* Update the user-provided params.
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* @param {Object} params Params.
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*/
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ol.source.ImageWMS.prototype.updateParams = function(params) {
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goog.object.extend(this.params_, params);
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this.image_ = null;
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this.dispatchChangeEvent();
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};
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