程序中设置了两个计时器，分别用以控制曲线的绘制和进度条。程序运行后，两个互相“缠绕”的小球绘制出曲线轨迹，而进度条也随着曲线绘制的进度同步增长。另外，该程序还实现了鼠标键对动画的简单控制：左键暂停，右键重新绘制动画。-The procedures set two timers, respectively, to control the drawing of the curve and the progress bar. The program is running, the two wound