izeko Feb 20, 2013 at 2:06 PM I have a Cannon located bottom right of screen that the angle can be altered by dragging up and down on the screen. What I want is the vector2 position of the end of the cannon. Then I can fire the ball from bottom right of screen in the direction the cannon is pointing. I can do this if I capture where the user touches the screen: ``````Vector2 direction = new Vector2(); direction = newPos - oldPos; direction.Normalize(); bouncingBall.farseerRectangle.ApplyForce(direction * 20);`````` But I need to know where the end of the cannon is not its centre point. Thanks genbox Coordinator Feb 24, 2013 at 2:30 AM Edited Feb 24, 2013 at 2:31 AM This has nothing to do with Farseer Physics. It is a basic part of vector math. You already have the center of the cannon, and you have the angle. You can extend a vector that starts at the center of the body and angle of the body, with half the length of the cannon. One way of doing it is: 1.5f is half the length of the cannon. This moves the point from the center to the end of the cannon. ``````Vector2 point = body.Position + new Vector2(1.5f, 0); Matrix matrix = Matrix.CreateRotationZ(body.Rotation);`````` Rotate the point to have the same angle as the body. ``Vector2.Transform(ref point, ref matrix, out point);``