clock

说明：  使用画线和画圆的技术在窗体中悔之绘制一个带有指针的钟表。通过一个时间计时器，每一秒钟触发一次。使用这样的方式来实现每一秒绘制一次图像。(Drawcircle painted lines and the use of technology in the form of regret on the map with a pointer of the watches. Time through a timer, every second the trigger once. Use this way to achieve an image every second drawing.)