title: XNA Vector2 Rotation Question
body: <p>I'm messing about with some stuff in XNA and am trying to move an object around asteroids-style in that you press left and right to rotate and up/down to go forwards and backwards in the direction you are pointing.</p>
  
  <p>I've got the rotation of the sprite done, but i can't get the object to move in the direction you've pointed it, it always moves up and down on the x = 0 axis. </p>
  
  <p>I'm guessing this is straight forward but I just can't figure it out. My "ship" class has the following properties which are note worthy here:</p>
  
  <pre><code>Vector2 Position
  float Rotation
  </code></pre>
  
  <p>The "ship" class has an update method is where the input is handled and so far I've got the following:</p>
  
  <pre><code>public void Update(GameTime gameTime)
  {
      KeyboardState keyboard = Keyboard.GetState();
      GamePadState gamePad = GamePad.GetState(PlayerIndex.One);
  
      float x = Position.X;
      float y = Position.Y;
  
      if (keyboard.IsKeyDown(Keys.Left))  Rotation -= 0.1f;
      if (keyboard.IsKeyDown(Keys.Right)) Rotation += 0.1f;
      if (keyboard.IsKeyDown(Keys.Up))    ??;
      if (keyboard.IsKeyDown(Keys.Down))  ??;
  
      this.Position = new Vector2(x, y);
  }
  </code></pre>
  
  <p>Any help would be most appreciated! </p>