本人自己编写，目前为止唯一一个可以用鼠标中键控制图片大小缩放，点击鼠标可以拖拽jpg格式图片的delphi源码，网上独此一家-I have written so far only one mouse button can control the image size scaling, click the mouse to drag the jpg format pictures delphi source, this one line alone