entity.cs

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.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;



namespace Brakanoid
{
    public abstract class Entity
    {
        protected ContentManager content;
        protected Vector2       position;   //Positionen på objektet
        protected Texture2D     gfx;        //Texturen på objektet
        protected Rectangle     box;        //Boxen som ska hantera collision
        protected Vector2       speed;
        protected float angle;
        protected float radius;
        protected float scale;

        public Entity(ContentManager content)
        {
            this.content = content;
        }


        public virtual void Update(GameTime gameTime)
        {
            bool anis = true;
            anis = false;
        }

        public virtual void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(gfx, position, null, Color.White, 
                angle, new Vector2(gfx.Width / 2, gfx.Height / 2),
                scale, SpriteEffects.None, 0);
        }

        public virtual void CheckCollision(Entity e)
        {

        }
    }
}

main.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;

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

        Paddle paddle;

        public static List<Entity> balls = new List<Entity>();
        
        public Main()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            graphics.PreferredBackBufferWidth = 800;
            graphics.PreferredBackBufferHeight = 480;
        }

        /// <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()
        {
            // TODO: Add your initialization logic here
            balls.Add(new Ball(Content));
            balls.Add(new Ball(Content, 500, 230));

            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);

            // TODO: use this.Content to load your game content here
            paddle = new Paddle(Content);
        }

        /// <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();

            // TODO: Add your update logic here
            paddle.Update(gameTime);

            //Uppdaterar varje boll
            foreach (Entity b in balls)
            {
                b.Update(gameTime);
            }

            //Kollar kollision med boll mot paddan..
            for (int i = 0; i < balls.Count; i++)
            {
                //paddle.CheckCollision(balls[i]);
                paddle.CheckCollision(balls[i]);
            }

            base.Update(gameTime);
        }

        /// <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)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            spriteBatch.Begin();

            paddle.Draw(spriteBatch);

            // Ritar ut alla bollar.. Långa bollar på bengt
            foreach (Ball b in balls)
            {
                b.Draw(spriteBatch);
            }

            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}

paddle.cs

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.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;


namespace Brakanoid
{
    public class Paddle : Entity
    {
        public Paddle(ContentManager content)
            : base(content)
        {
            gfx = content.Load<Texture2D>("paddle");
            this.position = new Vector2(200, 450);
        }


        public override void Update(GameTime gameTime)
        {
            MouseState mouse = Mouse.GetState();
            if (mouse.X < 0 || mouse.X > 710) //Kontrollerar ifall paddeln är utanför skärmen
            {
                if (mouse.X < 0) this.position.X = 0;     //Hindrar paddeln från att hamna
                if (mouse.X > 710) this.position.X = 710; //utanför genom att "låsa" fast den
            }
            else
                this.position.X = mouse.X; //Paddelns position blir den samma som muspekarens

            this.box = new Rectangle((int)this.position.X, (int)this.position.Y, 90, 17);
        }

        public override void Draw(SpriteBatch spriteBatch)
        {
            base.Draw(spriteBatch);

            spriteBatch.Draw(this.gfx, this.position, Color.White);
        }

        public override void CheckCollision(Entity e)
        {
            if (this.box.Intersects(e.box))
                Console.WriteLine("Smäll!");
        }

        
    } 
}