positionMouse = new Vector2(Mouse.GetState().X, Mouse.GetState().Y);
            //http://stackoverflow.com/a/7346855
            rotationAngle = (float)((Math.PI * 0.5f) + Math.Atan2(positionMouse.Y - positionShip.Y, positionMouse.X - positionShip.X));
            // TODO: Add your update logic here

            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.Gray);

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


            spriteBatch.Draw(
                image,
                positionShip,
                null,
                Color.White,
                rotationAngle,
                shipOrigin,
                1.0f,
                SpriteEffects.None,
                0f);

            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}