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openlayers

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Build tools and sources for developing OpenLayers based mapping applications

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goog.provide('ol.source.ImageArcGISRest'); goog.require('ol'); goog.require('ol.Image'); goog.require('ol.asserts'); goog.require('ol.events'); goog.require('ol.events.EventType'); goog.require('ol.extent'); goog.require('ol.obj'); goog.require('ol.source.Image'); goog.require('ol.uri'); /** * @classdesc * Source for data from ArcGIS Rest services providing single, untiled images. * Useful when underlying map service has labels. * * If underlying map service is not using labels, * take advantage of ol image caching and use * {@link ol.source.TileArcGISRest} data source. * * @constructor * @fires ol.source.Image.Event * @extends {ol.source.Image} * @param {olx.source.ImageArcGISRestOptions=} opt_options Image ArcGIS Rest Options. * @api */ ol.source.ImageArcGISRest = function(opt_options) { var options = opt_options || {}; ol.source.Image.call(this, { attributions: options.attributions, logo: options.logo, projection: options.projection, resolutions: options.resolutions }); /** * @private * @type {?string} */ this.crossOrigin_ = options.crossOrigin !== undefined ? options.crossOrigin : null; /** * @private * @type {string|undefined} */ this.url_ = options.url; /** * @private * @type {ol.ImageLoadFunctionType} */ this.imageLoadFunction_ = options.imageLoadFunction !== undefined ? options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction; /** * @private * @type {!Object} */ this.params_ = options.params || {}; /** * @private * @type {ol.Image} */ this.image_ = null; /** * @private * @type {ol.Size} */ this.imageSize_ = [0, 0]; /** * @private * @type {number} */ this.renderedRevision_ = 0; /** * @private * @type {number} */ this.ratio_ = options.ratio !== undefined ? options.ratio : 1.5; }; ol.inherits(ol.source.ImageArcGISRest, ol.source.Image); /** * Get the user-provided params, i.e. those passed to the constructor through * the "params" option, and possibly updated using the updateParams method. * @return {Object} Params. * @api stable */ ol.source.ImageArcGISRest.prototype.getParams = function() { return this.params_; }; /** * @inheritDoc */ ol.source.ImageArcGISRest.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) { if (this.url_ === undefined) { return null; } resolution = this.findNearestResolution(resolution); var image = this.image_; if (image && this.renderedRevision_ == this.getRevision() && image.getResolution() == resolution && image.getPixelRatio() == pixelRatio && ol.extent.containsExtent(image.getExtent(), extent)) { return image; } var params = { 'F': 'image', 'FORMAT': 'PNG32', 'TRANSPARENT': true }; ol.obj.assign(params, this.params_); extent = extent.slice(); var centerX = (extent[0] + extent[2]) / 2; var centerY = (extent[1] + extent[3]) / 2; if (this.ratio_ != 1) { var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2; var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2; extent[0] = centerX - halfWidth; extent[1] = centerY - halfHeight; extent[2] = centerX + halfWidth; extent[3] = centerY + halfHeight; } var imageResolution = resolution / pixelRatio; // Compute an integer width and height. var width = Math.ceil(ol.extent.getWidth(extent) / imageResolution); var height = Math.ceil(ol.extent.getHeight(extent) / imageResolution); // Modify the extent to match the integer width and height. extent[0] = centerX - imageResolution * width / 2; extent[2] = centerX + imageResolution * width / 2; extent[1] = centerY - imageResolution * height / 2; extent[3] = centerY + imageResolution * height / 2; this.imageSize_[0] = width; this.imageSize_[1] = height; var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio, projection, params); this.image_ = new ol.Image(extent, resolution, pixelRatio, this.getAttributions(), url, this.crossOrigin_, this.imageLoadFunction_); this.renderedRevision_ = this.getRevision(); ol.events.listen(this.image_, ol.events.EventType.CHANGE, this.handleImageChange, this); return this.image_; }; /** * Return the image load function of the source. * @return {ol.ImageLoadFunctionType} The image load function. * @api */ ol.source.ImageArcGISRest.prototype.getImageLoadFunction = function() { return this.imageLoadFunction_; }; /** * @param {ol.Extent} extent Extent. * @param {ol.Size} size Size. * @param {number} pixelRatio Pixel ratio. * @param {ol.proj.Projection} projection Projection. * @param {Object} params Params. * @return {string} Request URL. * @private */ ol.source.ImageArcGISRest.prototype.getRequestUrl_ = function(extent, size, pixelRatio, projection, params) { ol.DEBUG && console.assert(this.url_ !== undefined, 'url is defined'); // ArcGIS Server only wants the numeric portion of the projection ID. var srid = projection.getCode().split(':').pop(); params['SIZE'] = size[0] + ',' + size[1]; params['BBOX'] = extent.join(','); params['BBOXSR'] = srid; params['IMAGESR'] = srid; params['DPI'] = 90 * pixelRatio; var url = this.url_; var modifiedUrl = url .replace(/MapServer\/?$/, 'MapServer/export') .replace(/ImageServer\/?$/, 'ImageServer/exportImage'); if (modifiedUrl == url) { ol.asserts.assert(false, 50); // `options.featureTypes` should be an Array } return ol.uri.appendParams(modifiedUrl, params); }; /** * Return the URL used for this ArcGIS source. * @return {string|undefined} URL. * @api stable */ ol.source.ImageArcGISRest.prototype.getUrl = function() { return this.url_; }; /** * Set the image load function of the source. * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function. * @api */ ol.source.ImageArcGISRest.prototype.setImageLoadFunction = function(imageLoadFunction) { this.image_ = null; this.imageLoadFunction_ = imageLoadFunction; this.changed(); }; /** * Set the URL to use for requests. * @param {string|undefined} url URL. * @api stable */ ol.source.ImageArcGISRest.prototype.setUrl = function(url) { if (url != this.url_) { this.url_ = url; this.image_ = null; this.changed(); } }; /** * Update the user-provided params. * @param {Object} params Params. * @api stable */ ol.source.ImageArcGISRest.prototype.updateParams = function(params) { ol.obj.assign(this.params_, params); this.image_ = null; this.changed(); };