fadushin@rodan.acs.syr.edu (Fred Dushin) (05/13/91)
I am interested in doing some off-screen drawing, but I am confused as to how to do it. One way would be, I guess, to build two windows of the same size, draw on one while the other is displayed, then switch them, but that seems like it would take up time (with the window manager, right?) Another way (Inside Mac I; ch6) is to open a new grafport and use copyBits to switch the bitmaps. I guess that would be less intensive computationally. My question is, do I use OpenPort(...) to create a new grafport in which to do the drawing? And, if I do, do I have to use NewPtr(...) beforehand to allocate space for a pointer to the grafport? This is for the purposes of animation. Are there any "skeleton" algorithms out there for off-screen drawing that use this second method? Thanks, Fred Dushin Syracuse University, Syracuse, NY Internet: Bitnet: fadushin@rodan.acs.syr.edu fadushin@sunrise.bitnet