157 lines
4.1 KiB
JavaScript
157 lines
4.1 KiB
JavaScript
goog.provide('ol.source.MapGuide');
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goog.require('goog.object');
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goog.require('goog.uri.utils');
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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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/**
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* @constructor
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* @extends {ol.source.Image}
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* @param {olx.source.MapGuideOptions} options Options.
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*/
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ol.source.MapGuide = function(options) {
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var imageUrlFunction;
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if (goog.isDef(options.url)) {
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var params = goog.isDef(options.params) ? options.params : {};
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imageUrlFunction = ol.ImageUrlFunction.createFromParamsFunction(
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options.url, params, goog.bind(this.getUrl, this));
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} else {
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imageUrlFunction = ol.ImageUrlFunction.nullImageUrlFunction;
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}
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goog.base(this, {
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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 {boolean}
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*/
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this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
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/**
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* @private
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* @type {number}
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*/
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this.displayDpi_ = goog.isDef(options.displayDpi) ?
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options.displayDpi : 96;
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/**
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* @private
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* @type {number}
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*/
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this.metersPerUnit_ = goog.isDef(options.metersPerUnit) ?
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options.metersPerUnit : 1;
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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) ? options.ratio : 1;
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/**
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* @private
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* @type {boolean}
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*/
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this.useOverlay_ = goog.isDef(options.useOverlay) ?
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options.useOverlay : false;
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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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goog.inherits(ol.source.MapGuide, ol.source.Image);
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/**
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* @inheritDoc
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*/
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ol.source.MapGuide.prototype.getImage =
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function(extent, resolution, pixelRatio, projection) {
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resolution = this.findNearestResolution(resolution);
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pixelRatio = this.hidpi_ ? pixelRatio : 1;
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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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image.getPixelRatio() == pixelRatio &&
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ol.extent.containsExtent(image.getExtent(), extent)) {
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return image;
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}
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if (this.ratio_ != 1) {
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extent = extent.slice();
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ol.extent.scaleFromCenter(extent, this.ratio_);
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}
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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 * pixelRatio, height * pixelRatio];
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this.image_ = this.createImage(
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extent, resolution, pixelRatio, size, projection);
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return this.image_;
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};
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/**
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* @param {ol.Extent} extent The map extents.
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* @param {ol.Size} size the viewport size.
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* @param {number} metersPerUnit The meters-per-unit value.
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* @param {number} dpi The display resolution.
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* @return {number} The computed map scale.
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*/
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ol.source.MapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
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var mcsW = ol.extent.getWidth(extent);
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var mcsH = ol.extent.getHeight(extent);
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var devW = size[0];
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var devH = size[1];
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var mpp = 0.0254 / dpi;
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if (devH * mcsW > devW * mcsH) {
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return mcsW * metersPerUnit / (devW * mpp); // width limited
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} else {
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return mcsH * metersPerUnit / (devH * mpp); // height limited
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}
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};
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/**
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* @param {string} baseUrl The mapagent url.
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* @param {Object.<string, string|number>} params Request parameters.
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* @param {ol.Extent} extent Extent.
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* @param {ol.Size} size Size.
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* @param {ol.proj.Projection} projection Projection.
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* @return {string} The mapagent map image request URL.
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*/
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ol.source.MapGuide.prototype.getUrl =
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function(baseUrl, params, extent, size, projection) {
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var scale = ol.source.MapGuide.getScale(extent, size,
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this.metersPerUnit_, this.displayDpi_);
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var center = ol.extent.getCenter(extent);
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var baseParams = {
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'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',
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'VERSION': '2.0.0',
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'LOCALE': 'en',
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'CLIENTAGENT': 'ol.source.MapGuide source',
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'CLIP': '1',
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'SETDISPLAYDPI': this.displayDpi_,
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'SETDISPLAYWIDTH': Math.round(size[0]),
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'SETDISPLAYHEIGHT': Math.round(size[1]),
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'SETVIEWSCALE': scale,
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'SETVIEWCENTERX': center[0],
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'SETVIEWCENTERY': center[1]
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};
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goog.object.extend(baseParams, params);
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return goog.uri.utils.appendParamsFromMap(baseUrl, baseParams);
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};
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