XForms: Pixmaps etc.

Andrew V. Messier (amess@WPI.EDU)
Wed, 24 Jun 1998 14:32:54 -0400 (EDT)

# To subscribers of the xforms list from "Andrew V. Messier" <amess@WPI.EDU> :

HI, I'm the guy who asked about the pixmaps problem. Perhaps
my solution is much easier than creating a pixmap since it
seems to be involved. To repeat what I'mn trying to do . . I
read in USGS map data and color in a topographical map using
simple draw_pixel commands. I then have a graphic of an aircraft
which can move freely over the map, but which obviously erases
what's under it. Is it possible to paint the aircraft with some
type of XOR scheme so the original pixel color comes back after
the plane moves. Or is there some way to read what color a certain
pixel is so I can redraw the map that was previously under the
airplane? I'm trying to avoid keeping the 600 by 600 pixel
map in memory, although I guess that is an option. Thanks
in advance fr any help
- Andy Messier
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