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-/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
- * full list of contributors). Published under the 2-clause BSD license.
- * See license.txt in the OpenLayers distribution or repository for the
- * full text of the license. */
-
-
-/**
- * @requires OpenLayers/Layer/Grid.js
- */
-
-/**
- * Class: OpenLayers.Layer.TileCache
- * A read only TileCache layer. Used to requests tiles cached by TileCache in
- * a web accessible cache. This means that you have to pre-populate your
- * cache before this layer can be used. It is meant only to read tiles
- * created by TileCache, and not to make calls to TileCache for tile
- * creation. Create a new instance with the
- * <OpenLayers.Layer.TileCache> constructor.
- *
- * Inherits from:
- * - <OpenLayers.Layer.Grid>
- */
-OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
-
- /**
- * APIProperty: isBaseLayer
- * {Boolean} Treat this layer as a base layer. Default is true.
- */
- isBaseLayer: true,
-
- /**
- * APIProperty: format
- * {String} Mime type of the images returned. Default is image/png.
- */
- format: 'image/png',
-
- /**
- * APIProperty: serverResolutions
- * {Array} A list of all resolutions available on the server. Only set this
- * property if the map resolutions differ from the server. This
- * property serves two purposes. (a) <serverResolutions> can include
- * resolutions that the server supports and that you don't want to
- * provide with this layer. (b) The map can work with resolutions
- * that aren't supported by the server, i.e. that aren't in
- * <serverResolutions>. When the map is displayed in such a resolution
- * data for the closest server-supported resolution is loaded and the
- * layer div is stretched as necessary.
- */
- serverResolutions: null,
-
- /**
- * Constructor: OpenLayers.Layer.TileCache
- * Create a new read only TileCache layer.
- *
- * Parameters:
- * name - {String} Name of the layer displayed in the interface
- * url - {String} Location of the web accessible cache (not the location of
- * your tilecache script!)
- * layername - {String} Layer name as defined in the TileCache
- * configuration
- * options - {Object} Optional object with properties to be set on the
- * layer. Note that you should speficy your resolutions to match
- * your TileCache configuration. This can be done by setting
- * the resolutions array directly (here or on the map), by setting
- * maxResolution and numZoomLevels, or by using scale based properties.
- */
- initialize: function(name, url, layername, options) {
- this.layername = layername;
- OpenLayers.Layer.Grid.prototype.initialize.apply(this,
- [name, url, {}, options]);
- this.extension = this.format.split('/')[1].toLowerCase();
- this.extension = (this.extension == 'jpg') ? 'jpeg' : this.extension;
- },
-
- /**
- * APIMethod: clone
- * obj - {Object}
- *
- * Returns:
- * {<OpenLayers.Layer.TileCache>} An exact clone of this
- * <OpenLayers.Layer.TileCache>
- */
- clone: function (obj) {
-
- if (obj == null) {
- obj = new OpenLayers.Layer.TileCache(this.name,
- this.url,
- this.layername,
- this.getOptions());
- }
-
- //get all additions from superclasses
- obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);
-
- // copy/set any non-init, non-simple values here
-
- return obj;
- },
-
- /**
- * 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) {
- var res = this.getServerResolution();
- var bbox = this.maxExtent;
- var size = this.tileSize;
- var tileX = Math.round((bounds.left - bbox.left) / (res * size.w));
- var tileY = Math.round((bounds.bottom - bbox.bottom) / (res * size.h));
- var tileZ = this.serverResolutions != null ?
- OpenLayers.Util.indexOf(this.serverResolutions, res) :
- this.map.getZoom();
-
- var components = [
- this.layername,
- OpenLayers.Number.zeroPad(tileZ, 2),
- OpenLayers.Number.zeroPad(parseInt(tileX / 1000000), 3),
- OpenLayers.Number.zeroPad((parseInt(tileX / 1000) % 1000), 3),
- OpenLayers.Number.zeroPad((parseInt(tileX) % 1000), 3),
- OpenLayers.Number.zeroPad(parseInt(tileY / 1000000), 3),
- OpenLayers.Number.zeroPad((parseInt(tileY / 1000) % 1000), 3),
- OpenLayers.Number.zeroPad((parseInt(tileY) % 1000), 3) + '.' + this.extension
- ];
- var path = components.join('/');
- var url = this.url;
- if (OpenLayers.Util.isArray(url)) {
- url = this.selectUrl(path, url);
- }
- url = (url.charAt(url.length - 1) == '/') ? url : url + '/';
- return url + path;
- },
-
- CLASS_NAME: "OpenLayers.Layer.TileCache"
-});