Problems with TColor()

From: Janousch Markus (Markus.Janousch@psi.ch)
Date: Fri Dec 11 1998 - 14:33:19 MET


   Dear Rooters,

 It seems that in Root the colors ci=1,..., 50 are already
defined. Also the corresponding lighter and darker colors ci+100 and
ci+150 are defined by Root. I want to define my own 50 colors not
changing the colors predefined by Root. When calling the normal ctor
for TColor for colors in the range of 51 - 100, which are not
predefined in Root, the ctor complains, because it tries to create also
the colors from 151 - 250 which already exist in part. So, the colors
51 - 100 cannot be created by a user. Maybe it would be useful to
change the statement in the ctor 
  if (color > 0 && color < 100) {   //*-*- Now create associated
colors for WBOX shading 
to
 if (color > 0 && color < 51)  ?
 

 On the other hand, creating colors beyond 255 seems to be possible,
but any object drawn with such a high number apears to be white. I am
not really sure whether this is due to a limitation of the colormap. I
couldn't plot objects with color numbers beyond 255 on a SparcStation
2 and a Linux-PC.

Also, I discovered that colors from 201 - 228 are predefined by
Root. What are they beeing used for?

So it seems that if I want to create new colors I am stuck with the
color number 229 - 255 or am I doing something wrong? Any hints are
most welcome!

   Cheers, Markus

--
markus.janousch@psi.ch



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