Fixed #11

Vertex2D now stands alone and is simply composed of 3 Points2D

lib/math.js

@@ -112,7 +112,7 @@ Cannon.Math.Point2D.polar = function(length, angle)
 /**
 A vertex class used for geometrical shapes. Has x and y properties as well as 2 control points 
 */
-Cannon.Math.Vertex2D = Cannon.Math.Point2D.extend({
+Cannon.Math.Vertex2D = Cannon.ClassFactory.extend({
 	/**
 	This constructor accepts both numbers and Point2D as parameters. 
 	You can define up to 3 points, each one either as a Point2D or as 2 arguments defining x and y.
@@ -121,60 +121,25 @@ Cannon.Math.Vertex2D = Cannon.Math.Point2D.extend({
 	@constructor
 	*/
 	__construct: function()
-	{
-		this._super(false);
+	{		
 		//main point
-		var p = this.__processPoint(arguments[0], arguments[0], arguments[1]);
-		if (p){
-			this.x = p.x;
-			this.y = p.y;
-		}
-		else
-		{
-			this.x = 0;
-			this.y = 0;
-			Cannon.Logger.log('Unable to process Cannon.Vertex constructor arguments, used (0, 0) instead', Cannon.Logger.Warning);
-		}
-
+		this.point = this.__processPoint(arguments[0], arguments[0], arguments[1]);
 		//control point 1
-		var cp1 = this.__processPoint(arguments[1], arguments[2], arguments[3]);
-		if (cp1)
-		{
-			this.cp1x = cp1.x;
-			this.cp1y = cp1.y;
-		}
-		else 
-		{
-			this.cp1x = this.x;
-			this.cp1y = this.y;
-		}
-
+		this.controlPoint1 = this.__processPoint(arguments[1], arguments[2], arguments[3]);
 		//control point 2
-		var cp2 = this.__processPoint(arguments[2], arguments[4], arguments[5]);
-		if (cp2) 
-		{
-			this.cp2x = cp2.x;
-			this.cp2y = cp2.y;
-		}
-		else
-		{
-			this.cp2x = this.cp1x;
-			this.cp2y = this.cp1y;
-		}
+		this.controlPoint2 = this.__processPoint(arguments[2], arguments[4], arguments[5]);
 	},
 	__processPoint: function(point, x, y){
 		//returns an object because we dont need all the methods asssociated with Point2D
-		if (Cannon.Utils.instanceOf(point, Cannon.Math.Point2D) || (point && point.x && point.y))
-		{
-			return {x: point.x, y: point.y};
+		if (Cannon.Utils.instanceOf(point, Cannon.Math.Point2D) || (point && point.x && point.y)){
+			return new Cannon.Math.Point2D(point.x, point.y);
 		}
-		else if (Cannon.Utils.isNumber(x) && Cannon.Utils.isNumber(y))
-		{
-			return {x: x, y: y};
+		else if (Cannon.Utils.isNumber(x) && Cannon.Utils.isNumber(y)){
+			return new Cannon.Math.Point2D(x, y);
 		}
-		else
-		{
-			return false;
+		else{
+			Cannon.Logger.log('Unable to process Cannon.Vertex constructor arguments, used (0, 0) instead', Cannon.Logger.Warning);
+			return new Cannon.Math.Point2D(0, 0);
 		}
 	},
 	/**