在picture控件中画框型图。画笔的颜色粗细可以改变-In the picture frame-type control chart. Thickness can change the color of the brush

vc作图，已画好的红框随着鼠标的移动而移动，当鼠标点击后，红框停在鼠标点击的位置后再变化-vc mapping, has drawn a good red frame and moves with the mouse when the mouse click, mouse click to stop the red line and then change position