Please be a problem, now I want to choose an area in the image control, using the response to press the left key, mobile and bounce, basic effect is as follows:


(this is the appearance of the mouse buttons hold when, another window will pop up after the mouse button pop-up and refreshing the image control in the picture)

But now due to use of color, and most of the background is grey, so basic can't see the selection box, which can change the color of the box, please excuse me, how to change

CodePudding user response:

You see the mainstream of image processing software, useful against color way? Why don't they use the color?

Copying another's first, such as time, can slowly try other ways.

CodePudding user response:

Dynamic ant search "line"

CodePudding user response:

With phase element 3 pen to draw a background frame, and then draw a dotted line box