removing the restrictedMinZoom property, and allow for restricting zoom levels with maxResolution and numZoomLevels. Thanks tschaub for the doc, test and examples improvements. r=tschaub (see #3338)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12106 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Bing.js

@@ -21,6 +21,21 @@
  */
 OpenLayers.Layer.Bing = OpenLayers.Class(OpenLayers.Layer.XYZ, {
 
+    /**
+     * Property: serverResolutions
+     * {Array} the resolutions provided by the Bing servers.
+     */
+    serverResolutions: [
+        156543.03390625, 78271.516953125, 39135.7584765625,
+        19567.87923828125, 9783.939619140625, 4891.9698095703125,
+        2445.9849047851562, 1222.9924523925781, 611.4962261962891,
+        305.74811309814453, 152.87405654907226, 76.43702827453613,
+        38.218514137268066, 19.109257068634033, 9.554628534317017,
+        4.777314267158508, 2.388657133579254, 1.194328566789627,
+        0.5971642833948135, 0.29858214169740677, 0.14929107084870338,
+        0.07464553542435169
+    ],
+    
     /**
      * Property: attributionTemplate
      * {String}
@@ -80,7 +95,6 @@ OpenLayers.Layer.Bing = OpenLayers.Class(OpenLayers.Layer.XYZ, {
      */
     initialize: function(options) {
         options = OpenLayers.Util.applyDefaults({
-            restrictedMinZoom: 1,
             sphericalMercator: true
         }, options);
         var name = options.name || "Bing " + (options.type || this.type);
@@ -127,12 +141,14 @@ OpenLayers.Layer.Bing = OpenLayers.Class(OpenLayers.Layer.XYZ, {
             this.url.push(url.replace("{subdomain}", res.imageUrlSubdomains[i]));
         };
         this.addOptions({
-            restrictedMinZoom: res.zoomMin,
-            numZoomLevels: res.zoomMax + 1
-        });
-        this.updateAttribution();
-        // redraw to replace "blank.gif" tiles with real tiles
-        this.redraw();
+            maxResolution: Math.min(
+                this.serverResolutions[res.zoomMin], this.maxResolution
+            ),
+            zoomOffset: res.zoomMin,
+            numZoomLevels: Math.min(
+                res.zoomMax + 1 - res.zoomMin, this.numZoomLevels
+            )
+        }, true);
     },
 
     /**