说明：  模拟石英钟,通过Decodetime过程获取当前时间的时,分,秒,并利用Sin函数和Cos函数计算出时针,分针,秒针的移动度数,并在TImage组件上进行重画,在重画前将上一次的画线擦除
(Analog clock, through the process of acquiring the current time Decodetime the hours, minutes, seconds, and use Sin and Cos function function to calculate the clock, minute hand, second hand mobile Degrees and TImage components on re-painting, in the re-drawing before the Erase a line of paint)