Invalidating an outline? or something?
Posted on 2000-03-25
I need help.
Now that we've established that, here's my question:
I'm trying to write a bunch of drawing tools that will help to draw a map. These include ellipses, rectangles, and polylines.
I want the program to invalidate the outline of the circle, I guess, and not the entire background. I have to be able to draw and still leave lines and other stuff behind the ellipse.
I'm using pDC->Ellipse(RECT lpRect) and other built-in MFC drawing functions.
So far I'm not invalidating anything at all so it still erases everything it goes over as you're drawing it.
Any suggestions? (My goal here is to be able to do something like MSPAINT where you can make it appear to simply draw outlines.)
Thanks in advance,