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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"
});
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