TomorrowGame.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
using Box2D.XNA;

namespace Tomorrow
{
    public class TomorrowGame : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        World world;
        Body ground;
        Body body;

        Texture2D muffin;

        public TomorrowGame()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            this.world = new World(new Vector2(0, 25f), true);
        }

        protected override void Initialize()
        {
            base.Initialize();

            BodyDef groundBodyDef = new BodyDef();
            groundBodyDef.type = BodyType.Static;
            groundBodyDef.position = new Vector2(100.0f, 400.0f);
            ground = world.CreateBody(groundBodyDef);
            PolygonShape groundBox = new PolygonShape();
            groundBox.SetAsBox(50.0f, 10.0f);
            ground.CreateFixture(groundBox, 0.0f);

            BodyDef bodyDef = new BodyDef();
            bodyDef.type = BodyType.Dynamic;
            bodyDef.position = new Vector2(50.0f, 0.0f);
            body = world.CreateBody(bodyDef);

            PolygonShape dynamicBox = new PolygonShape();
            dynamicBox.SetAsBox(64, 64);
            FixtureDef fixtureDef = new FixtureDef();
            fixtureDef.shape = dynamicBox;
            fixtureDef.density = 1;
            fixtureDef.friction = 0.3f;
            body.CreateFixture(fixtureDef);
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            muffin = Content.Load<Texture2D>("muffin");
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            if (GamePad.GetState(PlayerIndex.One).Buttons.A == ButtonState.Pressed)
            {
                body.SetAwake(true);
                body.ApplyLinearImpulse(new Vector2(0, -0.85f * 25f), body.GetWorldCenter());
            }

            world.Step(1f / 60f, 8, 3);

            base.Update(gameTime);
        }

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

            spriteBatch.Begin();
            spriteBatch.Draw(muffin, body.GetPosition(), null, Color.White, body.GetAngle(), Vector2.Zero, 1, SpriteEffects.None, 0);
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}