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Re: PLOTS and color [message #3308]

Fri, 16 December 1994 15:35

weertj
Messages: 4
Registered: November 1994

Junior Member

In article <3cnv0n$h40@ncar.ucar.edu> cavanaug@uars2.acd.ucar.edu (Charles Cavanaugh) writes:

> Does anyone know how to get the PLOTS routine to use a given color? Specifically, when
> the device is in xor drawing mode?

If you are drawing in xor mode, the actual color index will be the
inverted value of the color which was already there, so in 8-bits: 255 gets 0
and %11100000 gets %00011111. So it is not easy to specify the color when in
the xor-mode. One possible soluction is to draw only to a few bitplanes by
using the command DEVICE, Set_Write_Mask.
For more info contact me at;

Jacco van Weert,
weertj@euronet.nl

R.I.F. , Leeuwarden, The Netherlands

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