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> From: "Andrew V. Messier" <amess@wpi.edu>
> Message-Id: <199806241832.OAA06877@wpi.WPI.EDU>
> Subject: XForms: Pixmaps etc.
> To: xforms@bob.usuf2.usuhs.mil
> Date: Wed, 24 Jun 1998 14:32:54 -0400 (EDT)
> In-Reply-To: <9806241324.AA16281@szechuan.UCSD.EDU> from "Steve Lamont" at Jun 24, 98 06:24:00 am
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> # 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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