主要实现中间来放大视图的功能，用惯了PROTEL 99SE增加软件到PADS不太习惯，所以写了个小增强软件，PADS右键功能没有屏蔽，只做了中间键向上滑动放大，向下滑动缩小，用中键按下上下拖放大的效果感觉不好。编程工具c++ builder 6.0-The main achievement of the middle to zoom in view of the function, used to increase software to PROTEL 99SE not in the habit of PADS, so wrote a small enhancement software, PADS Right-shielding function, only the middle button zoom upward sliding, sliding down to reduce by pressing the upper and lower keys of the effects of drag and drop big bad feeling. Programming tools c++ builder 6.0