全局变量表示了内核上一次执行函数的时间,期间一共发生了多少次时钟中断,显然函数必须为期间所发生的每一次时钟中断补上定时器服务。-The Global variable denotes the time when the CPU running the function the latest time, the number of time interrupt between the two running. It s obvious that add timer at every time interrupt.
使用CRectTrack类使用了图形的拾取 图形拖拉 图形变换
使用该类能够很方便地实现如上功能-CRectTrack category using the pick-up the use of graphical drag-and-drop graphics graphics transformation is convenient to use such to achieve above functions