这是一个陨石撞飞机的平面游戏：陨石不断向下落，飞机通过上下左右移动以躲避陨石。找出位图处理、定时器、碰撞检测函数。完善该程序。-This is a meteorite hit the aircraft, the plane game: meteorite to keep the whereabouts of the plane up and down and move around to escape through the meteorite. To find the bitmap handling, timers, collision detection function. Improve the program.