Support for moving vector features a given number of pixels, or to a given lon/lat, using a move() method. Patch from sbenthall. (Closes #1326)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7593 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Feature/Vector.js

@@ -216,6 +216,36 @@ OpenLayers.Feature.Vector = OpenLayers.Class(OpenLayers.Feature, {
     destroyPopup: function() {
         // pass
     },
+
+    /**
+     * Method: move
+     * Moves the feature and redraws it at its new location
+     *
+     * Parameters:
+     * state - {OpenLayers.LonLat or OpenLayers.Pixel} the
+     *         location to which to move the feature.
+     */
+    move: function(location) {
+
+        if(!this.layer || !this.geometry.move){
+            //do nothing if no layer or immoveable geometry
+            return;
+        }
+
+        var pixel;
+        if (location.CLASS_NAME == "OpenLayers.LonLat") {
+            pixel = this.layer.getViewPortPxFromLonLat(location);
+        } else {
+            pixel = location;
+        }
+        
+        var lastPixel = this.layer.getViewPortPxFromLonLat(this.geometry.getBounds().getCenterLonLat());
+        var res = this.layer.map.getResolution();
+        this.geometry.move(res * (pixel.x - lastPixel.x),
+                           res * (lastPixel.y - pixel.y));
+        this.layer.drawFeature(this);
+        return lastPixel;
+    },
     
     /**
      * Method: toState