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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Layer/Grid.js
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* @requires OpenLayers/Layer/KaMap.js
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*/
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/**
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* Class: OpenLayers.Layer.KaMapCache
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*
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* This class is designed to talk directly to a web-accessible ka-Map
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* cache generated by the precache2.php script.
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*
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* To create a a new KaMapCache layer, you must indicate also the "i" parameter
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* (that will be used to calculate the file extension), and another special
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* parameter, object names "metaTileSize", with "h" (height) and "w" (width)
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* properties.
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*
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* // Create a new kaMapCache layer.
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* var kamap_base = new OpenLayers.Layer.KaMapCache(
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* "Satellite",
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* "http://www.example.org/web/acessible/cache",
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* {g: "satellite", map: "world", i: 'png24', metaTileSize: {w: 5, h: 5} }
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* );
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*
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* // Create an kaMapCache overlay layer (using "isBaseLayer: false").
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* // Forces the output to be a "gif", using the "i" parameter.
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* var kamap_overlay = new OpenLayers.Layer.KaMapCache(
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* "Streets",
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* "http://www.example.org/web/acessible/cache",
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* {g: "streets", map: "world", i: "gif", metaTileSize: {w: 5, h: 5} },
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* {isBaseLayer: false}
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* );
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*
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* The cache URLs must look like:
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* var/cache/World/50000/Group_Name/def/t-440320/l20480
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*
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* This means that the cache generated via tile.php will *not* work with
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* this class, and should instead use the KaMap layer.
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*
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* More information is available in Ticket #1518.
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*
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* Inherits from:
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* - <OpenLayers.Layer.KaMap>
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* - <OpenLayers.Layer.Grid>
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*/
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OpenLayers.Layer.KaMapCache = OpenLayers.Class(OpenLayers.Layer.KaMap, {
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/**
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* Constant: IMAGE_EXTENSIONS
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* {Object} Simple hash map to convert format to extension.
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*/
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IMAGE_EXTENSIONS: {
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'jpeg': 'jpg',
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'gif' : 'gif',
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'png' : 'png',
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'png8' : 'png',
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'png24' : 'png',
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'dithered' : 'png'
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},
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/**
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* Constant: DEFAULT_FORMAT
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* {Object} Simple hash map to convert format to extension.
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*/
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DEFAULT_FORMAT: 'jpeg',
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/**
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* Constructor: OpenLayers.Layer.KaMapCache
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*
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* Parameters:
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* name - {String}
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* url - {String}
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* params - {Object} Parameters to be sent to the HTTP server in the
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* query string for the tile. The format can be set via the 'i'
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* parameter (defaults to jpg) , and the map should be set via
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* the 'map' parameter. It has been reported that ka-Map may behave
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* inconsistently if your format parameter does not match the format
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* parameter configured in your config.php. (See ticket #327 for more
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* information.)
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* options - {Object} Additional options for the layer. Any of the
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* APIProperties listed on this layer, and any layer types it
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* extends, can be overridden through the options parameter.
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*/
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initialize: function(name, url, params, options) {
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OpenLayers.Layer.KaMap.prototype.initialize.apply(this, arguments);
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this.extension = this.IMAGE_EXTENSIONS[this.params.i.toLowerCase() || this.DEFAULT_FORMAT];
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},
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/**
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* Method: getURL
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*
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* Parameters:
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* bounds - {<OpenLayers.Bounds>}
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*
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* Returns:
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* {String} A string with the layer's url and parameters and also the
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* passed-in bounds and appropriate tile size specified as
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* parameters
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*/
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getURL: function (bounds) {
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bounds = this.adjustBounds(bounds);
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var mapRes = this.map.getResolution();
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var scale = Math.round((this.map.getScale() * 10000)) / 10000;
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var pX = Math.round(bounds.left / mapRes);
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var pY = -Math.round(bounds.top / mapRes);
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var metaX = Math.floor(pX / this.tileSize.w / this.params.metaTileSize.w) * this.tileSize.w * this.params.metaTileSize.w;
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var metaY = Math.floor(pY / this.tileSize.h / this.params.metaTileSize.h) * this.tileSize.h * this.params.metaTileSize.h;
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var components = [
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"/",
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this.params.map,
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"/",
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scale,
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"/",
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this.params.g.replace(/\s/g, '_'),
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"/def/t",
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metaY,
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"/l",
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metaX,
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"/t",
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pY,
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"l",
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pX,
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".",
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this.extension
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];
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var url = this.url;
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if (OpenLayers.Util.isArray(url)) {
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url = this.selectUrl(components.join(''), url);
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}
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return url + components.join("");
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},
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CLASS_NAME: "OpenLayers.Layer.KaMapCache"
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});
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