Add worldwind support to OpenLayers. To define a worldwind layer, you need a URL, a lzd (level zero degrees), a maxZoom level, and a param name 'T' to define the map you're pulling from.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@695 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
2006-06-23 04:20:46 +00:00
parent bd166b5ac1
commit e0c564c0e3
3 changed files with 102 additions and 0 deletions
@@ -67,6 +67,7 @@ if (typeof(_OPENLAYERS_SFL_) == "undefined") {
        "OpenLayers/Layer/KaMap.js",
        "OpenLayers/Layer/Markers.js",
        "OpenLayers/Layer/Text.js",
+        "OpenLayers/Layer/WorldWind.js",
        "OpenLayers/Layer/WMS.js",
        "OpenLayers/Layer/WFS.js",
        "OpenLayers/Layer/WMS/Untiled.js",
@@ -0,0 +1,60 @@
+/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
+ * text of the license. */
+// @require: OpenLayers/Layer/Grid.js
+/**
+* @class
+*/
+OpenLayers.Layer.WorldWind = Class.create();
+OpenLayers.Layer.WorldWind.prototype = 
+  Object.extend( new OpenLayers.Layer.Grid(), {
+    
+    DEFAULT_PARAMS: {
+    },
+
+    // LevelZeroTileSizeDegrees
+    lzd: null,
+
+    zoomLevels: null,
+        
+    initialize: function(name, url, lzd, zoomLevels, params) {
+        this.lzd = lzd;
+        this.zoomLevels = zoomLevels;
+        var newArguments = new Array();
+        newArguments.push(name, url, params);
+        OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
+        this.params = (params ? params : {});
+        if (arguments.length > 0 && params) {
+            OpenLayers.Util.applyDefaults(
+                           this.params, 
+                           this.DEFAULT_PARAMS
+                           );
+        }
+    },
+    addTile:function(bounds,position) {
+        var zoom = this.map.getZoom();
+        var extent = this.map.getFullExtent();
+        zoom = zoom - Math.log(this.map.maxResolution / (this.lzd/512))/Math.log(2);
+        if (this.map.getResolution() <= (this.lzd/512) && zoom <= this.zoomLevels) {
+            var deg = this.lzd/Math.pow(2,zoom);
+            var x = Math.floor((bounds.left - extent.left)/deg);
+            var y = Math.floor((bounds.bottom - extent.bottom)/deg);
+            var url = this.getFullRequestString(
+                          { L: zoom, 
+                            X: x,
+                            Y: y
+                          });
+            return new OpenLayers.Tile.Image(this, position, bounds, 
+                                             url, this.tileSize);
+        } else {
+            var tile = new Object();
+            tile.draw = function() {};
+            tile.destroy = function() {};
+            tile.bounds = bounds;
+            tile.bounds = position;
+            return tile;
+        }
+    },
+    /** @final @type String */
+    CLASS_NAME: "OpenLayers.Layer.WorldWind"
+});