#807 - give geometries a resize method - examples and tests for demonstration

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3631 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Geometry/Collection.js

@@ -260,6 +260,24 @@ OpenLayers.Geometry.Collection.prototype =
         }
     },
 
+    /**
+     * APIMethod: resize
+     * Resize a geometry relative to some origin.  Use this method to apply
+     *     a uniform scaling to a geometry.
+     *
+     * Parameters:
+     * scale - {Float} Factor by which to scale the geometry.  A scale of 2
+     *                 doubles the size of the geometry in each dimension
+     *                 (lines, for example, will be twice as long, and polygons
+     *                 will have four times the area).
+     * origin - {OpenLayers.Geometry.Point} Point of origin for resizing
+     */
+    resize: function(scale, origin) {
+        for(var i=0; i<this.components.length; ++i) {
+            this.components[i].resize(scale, origin);
+        }
+    },
+
     /**
      * APIMethod: equals
      * Tests for equivalent geometries

lib/OpenLayers/Geometry/Point.js

@@ -148,6 +148,23 @@ OpenLayers.Geometry.Point.prototype =
         this.y = origin.y + (radius * Math.sin(theta));
     },
 
+    /**
+     * APIMethod: resize
+     * Resize a point relative to some origin.  For points, this has the effect
+     *     of scaling a vector (from the origin to the point).  This method is
+     *     more useful on geometry collection subclasses.
+     *
+     * Parameters:
+     * scale - {Float} Ratio of the new distance from the origin to the old
+     *                 distance from the origin.  A scale of 2 doubles the
+     *                 distance between the point and origin.
+     * origin - {OpenLayers.Geometry.Point} Point of origin for resizing
+     */
+    resize: function(scale, origin) {
+        this.x = origin.x + (scale * (this.x - origin.x));
+        this.y = origin.y + (scale * (this.y - origin.y));
+    },
+
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Geometry.Point"
 });