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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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*/
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/**
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* Class: OpenLayers.Layer.WorldWind
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*
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* Inherits from:
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* - <OpenLayers.Layer.Grid>
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*/
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OpenLayers.Layer.WorldWind = OpenLayers.Class(OpenLayers.Layer.Grid, {
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DEFAULT_PARAMS: {
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},
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/**
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* APIProperty: isBaseLayer
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* {Boolean} WorldWind layer is a base layer by default.
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*/
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isBaseLayer: true,
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/**
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* APIProperty: lzd
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* {Float} LevelZeroTileSizeDegrees
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*/
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lzd: null,
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/**
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* APIProperty: zoomLevels
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* {Integer} Number of zoom levels.
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*/
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zoomLevels: null,
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/**
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* Constructor: OpenLayers.Layer.WorldWind
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*
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* Parameters:
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* name - {String} Name of Layer
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* url - {String} Base URL
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* lzd - {Float} Level zero tile size degrees
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* zoomLevels - {Integer} number of zoom levels
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* params - {Object} additional parameters
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* options - {Object} additional options
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*/
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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 = [];
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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 = OpenLayers.Util.applyDefaults(
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this.params, this.DEFAULT_PARAMS
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);
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},
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/**
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* Method: getZoom
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* Convert map zoom to WW zoom.
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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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* 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 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.getImageLocation("blank.gif");
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}
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},
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CLASS_NAME: "OpenLayers.Layer.WorldWind"
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});
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