模拟大炮打飞机。在GUI界面上，飞机水平飞行，用界面上的按钮控制大炮的运行方向（如向左，向右，向上，向下）。当炮弹碰着飞机后，飞机坠落。-Simulated artillery to fight aircraft. GUI interface, the aircraft level flight, use the button on the interface to control the running direction of the cannon (left, right, up, dow