1 files changed, 105 insertions, 0 deletions
diff --git a/misc/openlayers/lib/OpenLayers/Layer/WorldWind.js b/misc/openlayers/lib/OpenLayers/Layer/WorldWind.js
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+++ b/misc/openlayers/lib/OpenLayers/Layer/WorldWind.js
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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.WorldWind
+ * 
+ * Inherits from:
+ *  - <OpenLayers.Layer.Grid>
+ */
+OpenLayers.Layer.WorldWind = OpenLayers.Class(OpenLayers.Layer.Grid, {
+    
+    DEFAULT_PARAMS: {
+    },
+
+    /**
+     * APIProperty: isBaseLayer
+     * {Boolean} WorldWind layer is a base layer by default.
+     */
+    isBaseLayer: true,
+
+    /** 
+     * APIProperty: lzd
+     * {Float} LevelZeroTileSizeDegrees
+     */
+    lzd: null,
+
+    /**
+     * APIProperty: zoomLevels
+     * {Integer} 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 - {Integer} 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: 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.getImageLocation("blank.gif");
+        }
+
+    },
+
+    CLASS_NAME: "OpenLayers.Layer.WorldWind"
+});