| /* 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 | |
| */ | |
| /** | |
| * Class: OpenLayers.Layer.WorldWind | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Layer.Grid> | |
| */ | |
| OpenLayers.Layer.WorldWind = OpenLayers.Class(OpenLayers.Layer.Grid, { | |
| DEFAULT_PARAMS: { | |
| }, | |
| /** | |
| * APIProperty: isBaseLayer | |
| * WorldWind layer is a base layer by default. | |
| */ | |
| isBaseLayer: true, | |
| /** | |
| * APIProperty: lzd | |
| * LevelZeroTileSizeDegrees | |
| */ | |
| lzd: null, | |
| /** | |
| * APIProperty: zoomLevels | |
| * Number of zoom levels. | |
| */ | |
| zoomLevels: null, | |
| /** | |
| * Constructor: OpenLayers.Layer.WorldWind | |
| * | |
| * Parameters: | |
| * name - {String} Name of Layer | |
| * url - {String} Base URL | |
| * lzd - {Float} Level zero tile size degrees | |
| * zoomLevels - {Int} number of zoom levels | |
| * params - {Object} additional parameters | |
| * options - {Object} additional options | |
| */ | |
| initialize: function(name, url, lzd, zoomLevels, params, options) { | |
| this.lzd = lzd; | |
| this.zoomLevels = zoomLevels; | |
| var newArguments = []; | |
| newArguments.push(name, url, params, options); | |
| OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments); | |
| this.params = OpenLayers.Util.applyDefaults( | |
| this.params, this.DEFAULT_PARAMS | |
| ); | |
| }, | |
| /** | |
| * Method: addTile | |
| * | |
| * Parameters: | |
| * bounds - {<OpenLayers.Bounds>} | |
| * position - {<OpenLayers.Pixel>} | |
| * | |
| * Returns: | |
| * {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image | |
| */ | |
| addTile:function(bounds,position) { | |
| return new OpenLayers.Tile.Image(this, position, bounds, | |
| null, this.tileSize); | |
| }, | |
| /** | |
| * Method: getZoom | |
| * Convert map zoom to WW zoom. | |
| */ | |
| getZoom: function () { | |
| var zoom = this.map.getZoom(); | |
| var extent = this.map.getMaxExtent(); | |
| zoom = zoom - Math.log(this.maxResolution / (this.lzd/512))/Math.log(2); | |
| return zoom; | |
| }, | |
| /** | |
| * 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 zoom = this.getZoom(); | |
| var extent = this.map.getMaxExtent(); | |
| var deg = this.lzd/Math.pow(2,this.getZoom()); | |
| var x = Math.floor((bounds.left - extent.left)/deg); | |
| var y = Math.floor((bounds.bottom - extent.bottom)/deg); | |
| if (this.map.getResolution() <= (this.lzd/512) | |
| && this.getZoom() <= this.zoomLevels) { | |
| return this.getFullRequestString( | |
| { L: zoom, | |
| X: x, | |
| Y: y | |
| }); | |
| } else { | |
| return OpenLayers.Util.getImagesLocation() + "blank.gif"; | |
| } | |
| }, | |
| CLASS_NAME: "OpenLayers.Layer.WorldWind" | |
| }); | |