| /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for | |
| * full list of contributors). Published under the Clear BSD license. | |
| * See http://svn.openlayers.org/trunk/openlayers/license.txt for the | |
| * full text of the license. */ | |
| /** | |
| * @requires OpenLayers/Layer/Grid.js | |
| * @requires OpenLayers/Layer/KaMap.js | |
| */ | |
| /** | |
| * Class: OpenLayers.Layer.KaMapCache | |
| * | |
| * This class is designed to talk directly to a web-accessible ka-Map | |
| * cache generated by the precache2.php script. | |
| * | |
| * To create a a new KaMapCache layer, you must indicate also the "i" parameter | |
| * (that will be used to calculate the file extension), and another special | |
| * parameter, object names "metaTileSize", with "h" (height) and "w" (width) | |
| * properties. | |
| * | |
| * // Create a new kaMapCache layer. | |
| * var kamap_base = new OpenLayers.Layer.KaMapCache( | |
| * "Satellite", | |
| * "http://www.example.org/web/acessible/cache", | |
| * {g: "satellite", map: "world", i: 'png24', metaTileSize: {w: 5, h: 5} } | |
| * ); | |
| * | |
| * // Create an kaMapCache overlay layer (using "isBaseLayer: false"). | |
| * // Forces the output to be a "gif", using the "i" parameter. | |
| * var kamap_overlay = new OpenLayers.Layer.KaMapCache( | |
| * "Streets", | |
| * "http://www.example.org/web/acessible/cache", | |
| * {g: "streets", map: "world", i: "gif", metaTileSize: {w: 5, h: 5} }, | |
| * {isBaseLayer: false} | |
| * ); | |
| * | |
| * The cache URLs must look like: | |
| * var/cache/World/50000/Group_Name/def/t-440320/l20480 | |
| * | |
| * This means that the cache generated via tile.php will *not* work with | |
| * this class, and should instead use the KaMap layer. | |
| * | |
| * More information is available in Ticket #1518. | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Layer.KaMap> | |
| * - <OpenLayers.Layer.Grid> | |
| */ | |
| OpenLayers.Layer.KaMapCache = OpenLayers.Class(OpenLayers.Layer.KaMap, { | |
| /** | |
| * Constant: IMAGE_EXTENSIONS | |
| * {Object} Simple hash map to convert format to extension. | |
| */ | |
| IMAGE_EXTENSIONS: { | |
| 'jpeg': 'jpg', | |
| 'gif' : 'gif', | |
| 'png' : 'png', | |
| 'png8' : 'png', | |
| 'png24' : 'png', | |
| 'dithered' : 'png' | |
| }, | |
| /** | |
| * Constant: DEFAULT_FORMAT | |
| * {Object} Simple hash map to convert format to extension. | |
| */ | |
| DEFAULT_FORMAT: 'jpeg', | |
| /** | |
| * Constructor: OpenLayers.Layer.KaMapCache | |
| * | |
| * Parameters: | |
| * name - {String} | |
| * url - {String} | |
| * params - {Object} Parameters to be sent to the HTTP server in the | |
| * query string for the tile. The format can be set via the 'i' | |
| * parameter (defaults to jpg) , and the map should be set via | |
| * the 'map' parameter. It has been reported that ka-Map may behave | |
| * inconsistently if your format parameter does not match the format | |
| * parameter configured in your config.php. (See ticket #327 for more | |
| * information.) | |
| * options - {Object} Additional options for the layer. Any of the | |
| * APIProperties listed on this layer, and any layer types it | |
| * extends, can be overridden through the options parameter. | |
| */ | |
| initialize: function(name, url, params, options) { | |
| OpenLayers.Layer.KaMap.prototype.initialize.apply(this, arguments); | |
| this.extension = this.IMAGE_EXTENSIONS[this.params.i.toLowerCase() || DEFAULT_FORMAT]; | |
| }, | |
| /** | |
| * Method: getURL | |
| * | |
| * Parameters: | |
| * bounds - {<OpenLayers.Bounds>} | |
| * | |
| * Returns: | |
| * {String} A string with the layer's url and parameters and also the | |
| * passed-in bounds and appropriate tile size specified as | |
| * parameters | |
| */ | |
| getURL: function (bounds) { | |
| bounds = this.adjustBounds(bounds); | |
| var mapRes = this.map.getResolution(); | |
| var scale = Math.round((this.map.getScale() * 10000)) / 10000; | |
| var pX = Math.round(bounds.left / mapRes); | |
| var pY = -Math.round(bounds.top / mapRes); | |
| var metaX = Math.floor(pX / this.tileSize.w / this.params.metaTileSize.w) * this.tileSize.w * this.params.metaTileSize.w; | |
| var metaY = Math.floor(pY / this.tileSize.h / this.params.metaTileSize.h) * this.tileSize.h * this.params.metaTileSize.h; | |
| // if url is not a string, it should be an array of strings, | |
| // in which case we will deterministically select one of them in | |
| // order to evenly distribute requests to different urls. | |
| // | |
| var url = this.url; | |
| if (url instanceof Array) { | |
| url = this.selectUrl(paramsString, url); | |
| } | |
| var components = [ | |
| url, | |
| "/", | |
| this.params.map, | |
| "/", | |
| scale, | |
| "/", | |
| this.params.g.replace(/\s/g, '_'), | |
| "/def/t", | |
| metaY, | |
| "/l", | |
| metaX, | |
| "/t", | |
| pY, | |
| "l", | |
| pX, | |
| ".", | |
| this.extension | |
| ]; | |
| return components.join(""); | |
| }, | |
| CLASS_NAME: "OpenLayers.Layer.KaMapCache" | |
| }); | |