求问C#， XNA 问题，如下是一个乒乓球小游戏的球运动的部分，在这个部分中，将球与球拍的碰撞检测放在最下面有什么缺点会造成什么问题要怎么解决呀。

Question

这个是放在update里面的，我的感觉就是在球速过快的时候，在上面图中的情况中由于代码的顺序，会先检测到墙壁然后检测到球拍，然后给球拍加了速，这样就不对了。但不清楚是不是这样的问题。求大佬指点

private void MoveBall()
        {
            // actually move the ball
            m_ball.X += m_ball.DX;
            m_ball.Y += m_ball.DY;

            // did ball touch top or bottom side?
            if (m_ball.Y <= 0 ||
                m_ball.Y >= SCREEN_HEIGHT - m_ball.Height)
            {
                // reverse vertical direction
                m_ball.DY *= -1;
            }

            // did ball touch the left side?
            if (m_ball.X <= 0)
            {
                // at higher speeds, the ball can leave the 
                // playing field, make sure that doesn't happen
                m_ball.X = 0;

                // increment player 2's score
                m_Score2++;

                // reduce speed, reverse direction
                m_ball.DX = 5.0f;
            }

            // did ball touch the right side?
            if (m_ball.X >= SCREEN_WIDTH - m_ball.Width)
            {
                // at higher speeds, the ball can leave the 
                // playing field, make sure that doesn't happen
                m_ball.X = SCREEN_WIDTH - m_ball.Width;

                // increment player 1's score
                m_Score1++;

                // reduce speed, reverse direction
                m_ball.DX = -5.0f;
            }

            // reset game if a player scores 10 goals
            if (m_Score1 > 9 || m_Score2 > 9)
            {
                ResetGame();
            }

            // did ball hit the paddle from the front?
            if (CollisionOccurred())
            {
                // reverse hoizontal direction
                m_ball.DX *= -1;

                // increase the speed a little.
                m_ball.DX *= 1.15f;
            }
        }

        // check for a collision between the ball and paddles
        private bool CollisionOccurred()
        {
            // assume no collision
            bool retval = false;

            // heading towards player one
            if (m_ball.DX < 0)
            {
                Rectangle b = m_ball.Rect;
                Rectangle p = m_paddle1.Rect;
                retval =
                    b.Left < p.Right &&
                    b.Right > p.Left &&
                    b.Top < p.Bottom &&
                    b.Bottom > p.Top;
            }
            // heading towards player two
            else // m_ball.DX > 0
            {
                Rectangle b = m_ball.Rect;
                Rectangle p = m_paddle2.Rect;
                retval =
                    b.Left < p.Right &&
                    b.Right > p.Left &&
                    b.Top < p.Bottom &&
                    b.Bottom > p.Top;
            }

            return retval;
        }

Answer 1

https://wenku.baidu.com/view/68474726541252d380eb6294dd88d0d233d43caa.html