本例通过多线程技术每100us重绘界面 在绘制界面时 根据时间绘制成表盘和指针的形状 同时 在表盘下方是数字表显示时间-That this example is in dial down part by the fact that multi-thread technology each 100 us draw an interface again while drawing the form becoming the dial and guiding principle according t