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C#-Quelltext

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;

namespace XNA_sidescroller_tests
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        Texture2D playerTexture;
        Texture2D backgroundTexture;
        Texture2D blockTexture;
            Vector2 speed = Vector2.Zero;
            Vector2 direction = Vector2.Zero;

            Color[] playerTextureData;
            Color[] blockTextureData;
            public bool playerBlockCollide;
        
        //Other classes
            PlayerBlockCollision playerBlockCollision;
        //

        Vector2 blockPosition = new Vector2(100,100);
        //Movements
        int playerSpawnY = 400;
        int playerSpawnX = 400;
        int playerSpeed = 150;
        int playerMoveUp = -1;
        int playerMoveDown = 1;
        int playerMoveLeft = -1;
        int playerMoveRight = 1;
        //
        Vector2 playerPosition = new Vector2(400, 400);


        //the size of the sprite
        public Rectangle size;

        //the amount to increase/decrease the size of the original sprite
        private float mScale = 1.0f;

        public float scale
        {
            get { return mScale; }
            set
            {
                mScale = value;
                //Recalculate the Size of the Sprite with the new scale
                size = new Rectangle(0, 0, (int)(playerTexture.Width * scale), (int)(playerTexture.Height * scale));
            }
        }
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            playerTexture = Content.Load<Texture2D>("circle");
            backgroundTexture = Content.Load<Texture2D>("background");
            blockTexture = Content.Load<Texture2D>("block");

            blockTextureData =
                new Color[blockTexture.Width * blockTexture.Height];
            blockTexture.GetData(blockTextureData);

            playerTextureData =
                new Color[playerTexture.Width * playerTexture.Height];
            playerTexture.GetData(playerTextureData);
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            KeyboardState currentState = Keyboard.GetState();
            UpdateMovement(currentState);
            playerPosition += direction * speed * (float)gameTime.ElapsedGameTime.TotalSeconds;
            playerBlockCollision = new PlayerBlockCollision();
            playerBlockCollision.Update(playerPosition, playerTexture, blockPosition, blockTexture, playerTextureData, blockTextureData);

            base.Update(gameTime);
        }


        private void UpdateMovement(KeyboardState theCurrentState)
        {
            speed = Vector2.Zero;
            direction = Vector2.Zero;
            //prüft welche Taste gedrückt wurde und bewegt in die Richtung
            if (theCurrentState.IsKeyDown(Keys.Right) == true)
            {
                speed.X = playerSpeed;
                direction.X = playerMoveRight;
            }
            if (theCurrentState.IsKeyDown(Keys.Left) == true)
            {
                speed.X = playerSpeed;
                direction.X = playerMoveLeft;
            }
            if (theCurrentState.IsKeyDown(Keys.Up) == true)
            {
                speed.Y = playerSpeed;
                direction.Y = playerMoveUp;
            }
            if (theCurrentState.IsKeyDown(Keys.Down) == true)
            {
                speed.Y = playerSpeed;
                direction.Y = playerMoveDown;
            }
        }
        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            

            spriteBatch.Begin();
            if (playerBlockCollide)
            {
                playerPosition = new Vector2(300, 300);
                GraphicsDevice.Clear(Color.Red);
                //spriteBatch.Draw(backgroundTexture, new Vector2(0, 0), Color.Black);
            }
            else
            {
                GraphicsDevice.Clear(Color.CornflowerBlue);
                //spriteBatch.Draw(backgroundTexture, new Vector2(0, 0), Color.White);
            }
            spriteBatch.Draw(playerTexture, playerPosition, new Rectangle(0, 0, playerTexture.Width, playerTexture.Height), Color.Tomato, 0.0f, Vector2.Zero, scale, SpriteEffects.None, 0);
            spriteBatch.Draw(blockTexture, blockPosition, Color.White);
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}

C#-Quelltext

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Storage;


namespace XNA_sidescroller_tests
{
    class PlayerBlockCollision
    {

        //Other classes
        Game1 game1;

        public void Update(Vector2 thePlayerPosition, Texture2D thePlayerTexture, Vector2 theBlockPosition, Texture2D theBlockTexture, Color[] thePlayerTextureData,Color[] theBlockTextureData)
        {

            Rectangle playerRectangle = 
                new Rectangle((int)thePlayerPosition.X, (int)thePlayerPosition.Y,
                    thePlayerTexture.Width, thePlayerTexture.Height);

            Rectangle blockRectangle = 
                new Rectangle((int)theBlockPosition.X,(int)theBlockPosition.Y,
                    theBlockTexture.Width, theBlockTexture.Height);

            //Check collision
            if(IntersectPixels(playerRectangle,thePlayerTextureData,blockRectangle,theBlockTextureData))
            {
                game1 = new Game1();
                game1.playerBlockCollide = true;
            }
        }
        static bool IntersectPixels(Rectangle rectangleA, Color[] dataA,
                                    Rectangle rectangleB, Color[] dataB)
        {
            // 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 true;
                    }
                }
            }

            // No intersection found
            return false;
        }
    }
}