remove extraneous diff functions. none of these was being used anyways. now all diffs return an OpenLayers.Pixel variable.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@53 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -35,48 +35,38 @@ OpenLayers.Pixel.prototype = {
         return new OpenLayers.Pixel(this.x, this.y); 
     },
     
-    /** returns a Size object with the difference 
-    *    between the two points
-    * 
-    * @return {OpenLayers.Size}
-    */
-    diff:function(pt) {          // subtract pt from this
-        return new OpenLayers.Size(this.x - pt.x, this.y - pt.y);
-    },
-
-    /** returns a Size object with the absolute difference 
-    *    between the two points
-    * 
-    * @param {OpenLayers.Pixel} pt
-    * 
-    * @return {OpenLayers.Size}
-    */
-    absDiff:function(pt) {
-        return new OpenLayers.Size(Math.abs(this.x - pt.x),
-                                   Math.abs(this.y - pt.y));
-    },
-
     /** returns a Pixel object with the difference 
-    *    between the two points
+    *    between the two pixels
     * 
-    * @param {OpenLayers.Pixel} pt
+    * @param {OpenLayers.Pixel} px
     *
     * @return {OpenLayers.Pixel}
     */
-    diffPt:function(pt) {
+    diff:function(px) {
-        var sz = this.diff(pt);
+        return new OpenLayers.Pixel(this.x - px.x, this.y - px.y);
-        return new OpenLayers.Pixel(sz.w, sz.h);
+    },
+
+    /** returns a Pixel object with the absolute difference 
+    *    between the two pixels
+    * 
+    * @param {OpenLayers.Pixel} px
+    * 
+    * @return {OpenLayers.Pixel}
+    */
+    diffABS:function(px) {
+        return new OpenLayers.Pixel(Math.abs(this.x - px.x),
+                                    Math.abs(this.y - px.y));
     },
 
     /** returns whether or not the two points are equal
     * 
-    * @param {OpenLayers.Pixel} pt
+    * @param {OpenLayers.Pixel} px
     * 
     * @return {bool}
     */
-    equal:function(pt) {
+    equal:function(px) {
-        var d = this.diff(pt);
+        var d = this.diff(px);
-        return ((d.w==0) && (d.h==0));
+        return ((d.x == 0) && (d.y == 0));
     },
 
     /** Return a new Pixel with this pixel's x&y augmented by