Add a method to scale geometries

src/ol/geom/geometry.js

@@ -180,6 +180,20 @@ ol.geom.Geometry.prototype.getExtent = function(opt_extent) {
 ol.geom.Geometry.prototype.rotate = function(angle, anchor) {};
 
 
+/**
+ * Scale the geometry (with an optional origin).  This modifies the geometry
+ * coordinates in place.
+ * @abstract
+ * @param {number} sx The scaling factor in the x-direction.
+ * @param {number=} opt_sy The scaling factor in the y-direction (defaults to
+ *     sx).
+ * @param {ol.Coordinate=} opt_anchor The scale origin (defaults to the center
+ *     of the geometry extent).
+ * @api
+ */
+ol.geom.Geometry.prototype.scale = function(sx, opt_sy, opt_anchor) {};
+
+
 /**
  * Create a simplified version of this geometry.  For linestrings, this uses
  * the the {@link