BounceBall - XNA Farseer Magic

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using RenderXNA;
using FarseerPhysics.Dynamics;
using FarseerPhysics;
using FarseerPhysics.Factories;

namespace FarseerXNADemo1
{
    public class Game2 : Game
    {
        GraphicsDeviceManager _graphics;
        SpriteBatch spriteBatch;

        Texture2D MyTexture;
        World MyWorld;
        Body BoxBody, FloorBody;

        public RenderXNAHelper RenderHelper;
        public Camera2D Camera;

        public Game2()
        {
            Window.Title = "Demo 2";

            _graphics = new GraphicsDeviceManager(this);
            _graphics.PreferredBackBufferWidth = 480;
            _graphics.PreferredBackBufferHeight = 800;
            _graphics.IsFullScreen = true;

            Content.RootDirectory = "Content";
        }

        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            base.LoadContent();

            //Load Blank Texture so that we can render colors over it.
            MyTexture = Content.Load<Texture2D>("blank");

            //Create New World with gravity of 10 units, downward.
            MyWorld = new World(-Vector2.UnitY * 10);

            //Create DebugView and switch on the Flags to render shapes.
            RenderHelper = new RenderXNAHelper(MyWorld);
            RenderHelper.AppendFlags(DebugViewFlags.TexturedShape);
            RenderHelper.RemoveFlags(DebugViewFlags.Shape);

            RenderHelper.DefaultShapeColor = Color.White;
            RenderHelper.SleepingShapeColor = Color.LightGray;
            RenderHelper.LoadContent(GraphicsDevice, Content);

            Camera = new Camera2D(GraphicsDevice);


            //Create Floor
            Fixture floorFixture = FixtureFactory.CreateRectangle(MyWorld,
                                        ConvertUnits.ToSimUnits(480),
                                        ConvertUnits.ToSimUnits(10), 10, 
                                        new RenderMaterial(MyTexture, "Blank") { Color = Color.Gray });
            floorFixture.Restitution = 0.5f;        //Bounceability
            floorFixture.Friction = 0.5f;           //Friction
            FloorBody = floorFixture.Body;          //Get Body from Fixture
            FloorBody.IsStatic = true;              //Floor must be stationary object

            //Create Box
            BoxBody = BodyFactory.CreateBody(MyWorld);
            FixtureFactory.CreateRectangle(ConvertUnits.ToSimUnits(50), ConvertUnits.ToSimUnits(50), 10, Vector2.Zero, BoxBody,
                                            new RenderMaterial(MyTexture, "Blank") { Color = Color.Green });
            foreach (Fixture fixture in BoxBody.FixtureList)
            {
                fixture.Restitution = 0.5f;
                fixture.Friction = 0.5f;
            }
            BoxBody.BodyType = BodyType.Dynamic;


            //Place floor object to bottom of the screen.
            FloorBody.Position = Camera2D.ConvertScreenToWorld(new Vector2(240, 700));

            //Place Box on screen, somewhere
            BoxBody.Position = Camera2D.ConvertScreenToWorld(new Vector2(240, 25));
        }

protected override void Update(GameTime gameTime)
{
    // Allows the game to exit
    if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
        this.Exit();

    if (MyWorld != null)
    {
        // Update the camera
        Camera.Update();

        // variable time step but never less then 30 Hz
        MyWorld.Step(Math.Min((float)gameTime.ElapsedGameTime.TotalMilliseconds * 0.001f, (1f / 30f)));
        RenderHelper.Update(gameTime);
    }

    base.Update(gameTime);
}

protected override void Draw(GameTime gameTime)
{
    GraphicsDevice.Clear(Color.CornflowerBlue);

    if (MyWorld != null)
    {
        //Render the Data
        RenderHelper.RenderDebugData(ref Camera2D.Projection, ref Camera2D.View);
    }

    base.Draw(gameTime);
}
    }
}