UNPKG

openlayers

Version:

Build tools and sources for developing OpenLayers based mapping applications

166 lines (141 loc) 4.05 kB
goog.provide('ol.source.CartoDB'); goog.require('ol'); goog.require('ol.obj'); goog.require('ol.source.State'); goog.require('ol.source.XYZ'); /** * @classdesc * Layer source for the CartoDB tiles. * * @constructor * @extends {ol.source.XYZ} * @param {olx.source.CartoDBOptions} options CartoDB options. * @api */ ol.source.CartoDB = function(options) { /** * @type {string} * @private */ this.account_ = options.account; /** * @type {string} * @private */ this.mapId_ = options.map || ''; /** * @type {!Object} * @private */ this.config_ = options.config || {}; /** * @type {!Object.<string, CartoDBLayerInfo>} * @private */ this.templateCache_ = {}; ol.source.XYZ.call(this, { attributions: options.attributions, cacheSize: options.cacheSize, crossOrigin: options.crossOrigin, logo: options.logo, maxZoom: options.maxZoom !== undefined ? options.maxZoom : 18, minZoom: options.minZoom, projection: options.projection, state: ol.source.State.LOADING, wrapX: options.wrapX }); this.initializeMap_(); }; ol.inherits(ol.source.CartoDB, ol.source.XYZ); /** * Returns the current config. * @return {!Object} The current configuration. * @api */ ol.source.CartoDB.prototype.getConfig = function() { return this.config_; }; /** * Updates the carto db config. * @param {Object} config a key-value lookup. Values will replace current values * in the config. * @api */ ol.source.CartoDB.prototype.updateConfig = function(config) { ol.obj.assign(this.config_, config); this.initializeMap_(); }; /** * Sets the CartoDB config * @param {Object} config In the case of anonymous maps, a CartoDB configuration * object. * If using named maps, a key-value lookup with the template parameters. * @api */ ol.source.CartoDB.prototype.setConfig = function(config) { this.config_ = config || {}; this.initializeMap_(); }; /** * Issue a request to initialize the CartoDB map. * @private */ ol.source.CartoDB.prototype.initializeMap_ = function() { var paramHash = JSON.stringify(this.config_); if (this.templateCache_[paramHash]) { this.applyTemplate_(this.templateCache_[paramHash]); return; } var mapUrl = 'https://' + this.account_ + '.cartodb.com/api/v1/map'; if (this.mapId_) { mapUrl += '/named/' + this.mapId_; } var client = new XMLHttpRequest(); client.addEventListener('load', this.handleInitResponse_.bind(this, paramHash)); client.addEventListener('error', this.handleInitError_.bind(this)); client.open('POST', mapUrl); client.setRequestHeader('Content-type', 'application/json'); client.send(JSON.stringify(this.config_)); }; /** * Handle map initialization response. * @param {string} paramHash a hash representing the parameter set that was used * for the request * @param {Event} event Event. * @private */ ol.source.CartoDB.prototype.handleInitResponse_ = function(paramHash, event) { var client = /** @type {XMLHttpRequest} */ (event.target); // status will be 0 for file:// urls if (!client.status || client.status >= 200 && client.status < 300) { var response; try { response = /** @type {CartoDBLayerInfo} */(JSON.parse(client.responseText)); } catch (err) { this.setState(ol.source.State.ERROR); return; } this.applyTemplate_(response); this.templateCache_[paramHash] = response; this.setState(ol.source.State.READY); } else { this.setState(ol.source.State.ERROR); } }; /** * @private * @param {Event} event Event. */ ol.source.CartoDB.prototype.handleInitError_ = function(event) { this.setState(ol.source.State.ERROR); }; /** * Apply the new tile urls returned by carto db * @param {CartoDBLayerInfo} data Result of carto db call. * @private */ ol.source.CartoDB.prototype.applyTemplate_ = function(data) { var tilesUrl = 'https://' + data.cdn_url.https + '/' + this.account_ + '/api/v1/map/' + data.layergroupid + '/{z}/{x}/{y}.png'; this.setUrl(tilesUrl); };