Path: utzoo!attcan!uunet!cs.utexas.edu!usc!bloom-beacon!MYCROFT.MAYO.EDU!bmc
From: bmc@MYCROFT.MAYO.EDU
Newsgroups: comp.windows.x
Subject: Stupid Colormap question.
Message-ID: <8908252022.AA00226@mycroft.mayo.edu>
Date: 25 Aug 89 20:22:50 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 31

I am at a lost as to why the following code does not product a gray scale
colormap. It does produce a monotonic black colormap.

back ground information:
     1) Hardware : DECstation 3100 running ULTRIX 2.0 operating under DECwindows
                   (color monitor = pseudocolor visual)
     2) first_window is the parent window of my application
     3) cmap is created with
             XCreateColormap (display, first_window,
                              DefaultVisual (display, screen), AllocAll )
     4) color is an array DisplayCells in size, allocated with a malloc.

the code:

        for (i = 0; i < DisplayCells(display, screen); i++) {
             color[i].flags = DoRed | DoBlue | DoGreen;
             color[i].pad   = NULL;
             color[i].red = color[i].green = color[i].blue = (i << 8);
             color[i].pixel = i;
                              }
             XStoreColors (display, cmap, color, DisplayCells(display, screen));
             XSetWindowColormap (display, first_window, cmap);

Thanks in advance for the help.

----------------------------------------------------
Bruce M. Cameron                    bmc@bru.mayo.edu
Medical Sciences 1-14               (507) 284-3288
Mayo Foundation                     WD9CKW
Rochester, MN 55905
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