ruderman@sbcs.sunysb.edu (David Ruderman) (10/23/90)
What is the best (smoothest, fastest) way to do some simple animation using X11.R4 on a Sun3? I would like to do nothing more than move 2D shapes (filled circles) around in a window. I have tried redrawing circles as well as Xcopyarea, but I am not satisfied with the jumpy movements (you can actually see the circles or bitmaps being filled in as the shape is moved). Any suggestions? -- David Ruderman ruderman@sbcs.sunysb.edu Department of Computer Science (516) 632-7675 SUNY at Stony Brook "The price of freedom is Stony Brook, NY 11794-4400 eternal vigilance."
klee@wsl.dec.com (Ken Lee) (10/23/90)
In article <1990Oct22.214447.21088@sbcs.sunysb.edu>, ruderman@sbcs.sunysb.edu (David Ruderman) writes: |> What is the best (smoothest, fastest) way to do some |> simple animation using X11.R4 on a Sun3? |> |> I would like to do nothing more than move 2D shapes (filled circles) |> around in a window. If you have more than a couple of moving objects, you probably want to do some sort of double buffering. One way is to draw on a hidden pixmap, then CopyArea it to the screen all at once. Another way is to draw everything to the screen, but play with the colormap so that only the "interesting" parts are visible. Finally, you could use the X11R4 double buffering extension. See the X11R4 ico demo program for sample code. -- Ken Lee DEC Western Software Laboratory, Palo Alto, Calif. Internet: klee@wsl.dec.com uucp: uunet!decwrl!klee
etaylor@wilkins.iaims.bcm.tmc.edu (Eric Taylor) (10/23/90)
There is yet another method for animation. If you have a n-plane system you can allocate n/2 planes for each buffer for your own kind of double buffer. -- Eric Taylor Baylor College of Medicine etaylor@wilkins.bmc.tmc.edu (713) 798-3776
mouse@LARRY.MCRCIM.MCGILL.EDU (10/24/90)
> What is the best (smoothest, fastest) way to do some simple animation > using X11.R4 on a Sun3? Use the Multi-Buffering extension, probably. Next choice, either draw to a pixmap and copy it onto the screen or draw using GXxor. If you have only a small number of different sizes of circle, you may find that it's faster to draw the circles once, into bitmaps, and then blit those bitmaps around instead of drawing circles all the time. (It amounts to finding out whether draw-filled-circle is faster than blit-bitmap or vice versa.) der Mouse old: mcgill-vision!mouse new: mouse@larry.mcrcim.mcgill.edu