Updated World vastly. No longer extends p2.World due to a few vars we can't alias cleanly, adds in lots of new helper methods.

Ready for Materials and Constraints.
InversePointProxy is for aliasing a p2 typed array when the values need reversing before applying (gravity for example).

Gruntfile.js

@@ -135,8 +135,10 @@ module.exports = function (grunt) {
 
         'src/physics/World.js',
         'src/physics/PointProxy.js',
+        'src/physics/InversePointProxy.js',
         'src/physics/Body.js',
         'src/physics/Spring.js',
+        'src/physics/Material.js',
 
         'src/particles/Particles.js',
         'src/particles/arcade/ArcadeParticles.js',

build/config.php

@@ -181,8 +181,10 @@
 
     <script src="$path/src/physics/World.js"></script>
     <script src="$path/src/physics/PointProxy.js"></script>
+    <script src="$path/src/physics/InversePointProxy.js"></script>
     <script src="$path/src/physics/Body.js"></script>
     <script src="$path/src/physics/Spring.js"></script>
+    <script src="$path/src/physics/Material.js"></script>
 
     <script src="$path/src/particles/Particles.js"></script>
     <script src="$path/src/particles/arcade/ArcadeParticles.js"></script>

src/physics/Body.js

@@ -70,7 +70,7 @@ Phaser.Physics.Body = function (game, sprite, x, y, mass) {
     if (sprite)
     {
         this.setRectangleFromSprite(sprite);
-        this.game.physics.addBody(this.data);
+        this.game.physics.addBody(this);
     }
 
 };
@@ -399,7 +399,7 @@ Phaser.Physics.Body.prototype = {
 
         if (this.data.world !== this.game.physics)
         {
-            this.game.physics.addBody(this.data);
+            this.game.physics.addBody(this);
         }
 
     },

src/physics/InversePointProxy.js

@@ -0,0 +1,61 @@
+/**
+* @author       Richard Davey <rich@photonstorm.com>
+* @copyright    2014 Photon Storm Ltd.
+* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
+*/
+
+/**
+* A InversePointProxy is an internal class that allows for direct getter/setter style property access to Arrays and TypedArrays but inverses the values on set.
+*
+* @class Phaser.Physics.InversePointProxy
+* @classdesc InversePointProxy
+* @constructor
+* @param {any} destination - The object to bind to.
+*/
+Phaser.Physics.InversePointProxy = function (destination) {
+
+	this.destination = destination;
+
+};
+
+Phaser.Physics.InversePointProxy.prototype.constructor = Phaser.Physics.InversePointProxy;
+
+/**
+* @name Phaser.Physics.InversePointProxy#x
+* @property {number} x - The x property of this InversePointProxy.
+*/
+Object.defineProperty(Phaser.Physics.InversePointProxy.prototype, "x", {
+    
+    get: function () {
+
+        return this.destination[0];
+
+    },
+
+    set: function (value) {
+
+        this.destination[0] *= -value;
+
+    }
+
+});
+
+/**
+* @name Phaser.Physics.InversePointProxy#y
+* @property {number} y - The y property of this InversePointProxy.
+*/
+Object.defineProperty(Phaser.Physics.InversePointProxy.prototype, "y", {
+    
+    get: function () {
+
+        return this.destination[1];
+
+    },
+
+    set: function (value) {
+
+        this.destination[1] *= -value;
+
+    }
+
+});