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C#-Quelltext

public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        bool Draw_debugView = true;
        World world;
        Body Ball, Heart;
        Texture2D BallSprite, HeartSprite;
        List<Vertices> list = new List<Vertices>();
        Vector2 _origin;
        float _scale;

        DebugViewXNA physicsDebug;
        private Matrix _view;
        private Vector2 _cameraPosition;
        private Vector2 _screenCenter;

        private static float _displayUnitsToSimUnitsRatio = 100f;

        public static Vector2 ToDisplayUnits(Vector2 simUnits)
        {
            return simUnits * _displayUnitsToSimUnitsRatio;
        }

        public bool Heart_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (fixtureB.CollisionCategories == Category.Cat15)
                //remove the heart body if the ball touches it
              world.RemoveBody(fixtureA.Body);
            return true;
        }

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            TargetElapsedTime = TimeSpan.FromTicks(333333);
            InactiveSleepTime = TimeSpan.FromSeconds(1);
            graphics.IsFullScreen = true;
        }

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

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);
            TouchPanel.EnabledGestures = GestureType.Tap;
            _view = Matrix.Identity;
            _cameraPosition = Vector2.Zero;
            _screenCenter = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2f, graphics.GraphicsDevice.Viewport.Height / 2f);
        
            if (world == null)
            {
                world = new World(new Vector2(0, 1));
            }
            else
            {
                world.Clear();
            }

            physicsDebug = new DebugViewXNA(world);
            physicsDebug.DefaultShapeColor = Color.White;
            physicsDebug.SleepingShapeColor = Color.LightGray;
            physicsDebug.LoadContent(GraphicsDevice, Content);

            BallSprite = Content.Load<Texture2D>("ballbig");
            HeartSprite = Content.Load<Texture2D>("heartbig");
            //create the ball
            Ball = BodyFactory.CreateCircle(world, 0.50f, 1.0f);
            Ball.BodyType = BodyType.Dynamic;
            Ball.Position = new Vector2(graphics.GraphicsDevice.Viewport.Width / 200f, graphics.GraphicsDevice.Viewport.Height / 200f-4f);
            Ball.Restitution = 0.5f;
            Ball.LinearVelocity = new Vector2(0, 2.0f);
            Ball.CollisionCategories = Category.Cat15;

            //create the heart
            uint[] data = new uint[HeartSprite.Width * HeartSprite.Height];
            HeartSprite.GetData(data);
            Vertices textureVertices = PolygonTools.CreatePolygon(data, HeartSprite.Width, false);
            Vector2 centroid = -textureVertices.GetCentroid();
            textureVertices.Translate(ref centroid);
            _origin = -centroid;
            textureVertices = SimplifyTools.ReduceByDistance(textureVertices, 4f);
            list = BayazitDecomposer.ConvexPartition(textureVertices);
            _scale = 1f;
            Vector2 vertScale = new Vector2(ConvertUnits.ToSimUnits(1)) * _scale;
            foreach (Vertices vertices in list)
            {
                vertices.Scale(ref vertScale);
            }

            Heart = BodyFactory.CreateCompoundPolygon(world, list, 1.0f, BodyType.Static);
            Heart.IsSensor = true;
            Heart.Position = new Vector2(4.20f, 2.00f);
            Heart.Rotation = 0f;
            Heart.CollisionCategories = Category.Cat4;
            Heart.OnCollision += Heart_OnCollision;
        }

        protected override void Update(GameTime gameTime)
        {
            float elapsed = (float)gameTime.ElapsedGameTime.TotalSeconds;
            world.Step(Math.Min(elapsed, (1f / 60f)));

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            spriteBatch.Begin();
              spriteBatch.Draw(BallSprite, ConvertUnits.ToDisplayUnits(Ball.Position), null, Color.White, Ball.Rotation, new Vector2(BallSprite.Width / 2.0f, BallSprite.Height / 2.0f), 1f, SpriteEffects.None, 0f);
              spriteBatch.Draw(HeartSprite, ConvertUnits.ToDisplayUnits(Heart.Position), null, Color.White, Heart.Rotation, _origin, _scale, SpriteEffects.None, 0f);          
            spriteBatch.End();

            if (Draw_debugView == true)
            {
              Matrix projection = Matrix.CreateOrthographicOffCenter(0f, graphics.GraphicsDevice.Viewport.Width / _displayUnitsToSimUnitsRatio, graphics.GraphicsDevice.Viewport.Height / _displayUnitsToSimUnitsRatio, 0f, 0f, 1f);
              Matrix view = Matrix.CreateTranslation(new Vector3((_cameraPosition / _displayUnitsToSimUnitsRatio) - (_screenCenter / _displayUnitsToSimUnitsRatio), 0f)) * Matrix.CreateTranslation(new Vector3((_screenCenter / _displayUnitsToSimUnitsRatio), 0f));
              physicsDebug.RenderDebugData(ref projection, ref view);
            }

            base.Draw(gameTime);
        }
    }

C#-Quelltext

  public bool Heart_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (fixtureB.CollisionCategories == Category.Cat15)
               //remove the heart body if the ball touches it
              //ohne folgende Zeile funktioniert es
              world.RemoveBody(fixtureA.Body);
            return true;
        }