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C#-Quelltext

    private Vector2 CheckCollision(int Index)
    {
        Rectangle rectangleA, rectangleB;
        rectangleA = new Rectangle((int)Position.X, (int)Position.Y, (int)Size.X, (int)Size.Y);
        rectangleB = new Rectangle((int)Level.CollisionMasks[Index].Position.X, (int)Level.CollisionMasks[Index].Position.Y, Level.CollisionMasks[Index].Texture.Width, Level.CollisionMasks[Index].Texture.Height);
        Color[] dataA, dataB;
        dataA = colorData;
        dataB = Level.CollisionMasks[Index].colorInfo;

        // Find the bounds of the rectangle intersection
        int top = Math.Max(rectangleA.Top, rectangleB.Top);
        int bottom = Math.Min(rectangleA.Bottom, rectangleB.Bottom);
        int left = Math.Max(rectangleA.Left, rectangleB.Left);
        int right = Math.Min(rectangleA.Right, rectangleB.Right);

        // Check every point within the intersection bounds
        for (int y = top; y < bottom; y++)
        {
            for (int x = left; x < right; x++)
            {
                // Get the color of both pixels at this point
                Color colorA = dataA[(x - rectangleA.Left) +
                                     (y - rectangleA.Top) * rectangleA.Width];
                Color colorB = dataB[(x - rectangleB.Left) +
                                     (y - rectangleB.Top) * rectangleB.Width];

                // If both pixels are not completely transparent,
                if (colorA.A != 0 && colorB.A != 0)
                {
                    // then an intersection has been found
                    return new Vector2(x, y);
                }
            }
        }

        // No intersection found
        return new Vector2(1.337f, 1.337f);
    }

C#-Quelltext

    override public void OnUpdate(GameTime gameTime)
    {  
        Vector2 previousPosition = Position;
        state = Player.State.Standing;

        if (Keyboard.GetState().IsKeyDown(Keys.A))
        {
            Velocity = new Vector2(-20, Velocity.Y);
            direction = Player.Direction.Left;
            state = Player.State.Walking;
        }
        else if (Keyboard.GetState().IsKeyDown(Keys.D))
        {
            Velocity = new Vector2(20, Velocity.Y);
            direction = Player.Direction.Right;
            state = Player.State.Walking;
        }
        else
            Velocity = Vector2.Zero;

        if (Keyboard.GetState().IsKeyDown(Keys.Space))
        {
            state = Player.State.Jumping;
        }

        Velocity += Acceleration * (float)gameTime.ElapsedGameTime.TotalSeconds;
        Position += Velocity;

        //check coli
        Vector2 PoC = CheckCollision(0);

        if (PoC != new Vector2(1.337f, 1.337f))
        {
            Position = previousPosition;
            MoveToContact();
        }

        switch (state)
        {
            case State.Walking: SetAnimation("Walk"); break;
            case State.Jumping: SetAnimation("Jump"); break;
            case State.Standing:
            default:SetAnimation("Stand"); break;
        }

        base.OnUpdate(gameTime);
    }
    private void MoveToContact()
    {
        Vector2 beforeCollision = Position;

        while (CheckCollision(0) == new Vector2(1.337f, 1.337f))
        {
            beforeCollision = Position;
            Position += new Vector2(0, 1);
        }

        Position = beforeCollision;
    }