9dfabad733
git-svn-id: http://svn.openlayers.org/branches/openlayers/2.2@1788 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
93 lines
2.9 KiB
JavaScript
93 lines
2.9 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* @class
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*
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* @requires OpenLayers/Layer/Grid.js
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*/
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OpenLayers.Layer.WorldWind = OpenLayers.Class.create();
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OpenLayers.Layer.WorldWind.prototype =
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OpenLayers.Class.inherit( OpenLayers.Layer.Grid, {
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DEFAULT_PARAMS: {
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},
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/** WorldWind layer is always a base layer
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*
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* @type Boolean
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*/
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isBaseLayer: true,
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// LevelZeroTileSizeDegrees
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lzd: null,
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zoomLevels: null,
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initialize: function(name, url, lzd, zoomLevels, params, options) {
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this.lzd = lzd;
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this.zoomLevels = zoomLevels;
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var newArguments = new Array();
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newArguments.push(name, url, params, options);
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OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
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this.params = (params ? params : {});
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if (params) {
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OpenLayers.Util.applyDefaults(
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this.params,
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this.DEFAULT_PARAMS
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);
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}
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},
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addTile:function(bounds,position) {
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if (this.map.getResolution() <= (this.lzd/512)
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&& this.getZoom() <= this.zoomLevels) {
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var url = this.getURL(bounds);
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return new OpenLayers.Tile.Image(this, position, bounds,
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url, this.tileSize);
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} else {
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return new OpenLayers.Tile.Image(this, position, bounds,
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OpenLayers.Util.getImagesLocation() + "blank.gif",
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this.tileSize);
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}
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},
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getZoom: function () {
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var zoom = this.map.getZoom();
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var extent = this.map.getMaxExtent();
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zoom = zoom - Math.log(this.maxResolution / (this.lzd/512))/Math.log(2);
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return zoom;
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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*
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* @returns 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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* @type String
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*/
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getURL: function (bounds) {
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var zoom = this.getZoom();
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var extent = this.map.getMaxExtent();
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var deg = this.lzd/Math.pow(2,this.getZoom());
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var x = Math.floor((bounds.left - extent.left)/deg);
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var y = Math.floor((bounds.bottom - extent.bottom)/deg);
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if (this.map.getResolution() <= (this.lzd/512)
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&& this.getZoom() <= this.zoomLevels) {
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return this.getFullRequestString(
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{ L: zoom,
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X: x,
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Y: y
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});
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} else {
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return OpenLayers.Util.getImagesLocation() + "blank.gif";
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}
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.WorldWind"
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});
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