1、　　设计并编程实现弹球程序：用户能通过菜单或者按钮新增一小球，该小球将从随机的位置出现，并具有随机颜色，随机速度以及随机的运动方向，小球沿初始方向匀速运动，当碰到窗口边缘时，小球将依据受力原理改变运动方向（可简化考虑，受力只改变小球的运动方向，小球仍按照初始速度匀速运动，且不考虑小球之间的碰撞）。-1, designed and programmed Pinball program: the user through the menu or button to add a small ball, the ball emerged from random locations and with random colors, random speed and random direction of motion, the ball along the initial direction of uniform motion, when it comes to the window edge, the ball will be based on the principle to change the force direction of motion (to simplify considerations, the force only change the direction of movement of the ball, the ball is still in accordance with the initial velocity of uniform motion, and does not consider the small collision between the ball).