Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!umd5!jonnyg
From: jonnyg@umd5.umd.edu (Jon Greenblatt)
Newsgroups: comp.windows.x
Subject: Re: Drawing lines in windows with bitmaps
Message-ID: <4846@umd5.umd.edu>
Date: 5 May 89 16:29:28 GMT
References: <8905022004.AA09962@sae.com> <6910007@hpfcdc.HP.COM>
Reply-To: jonnyg@umd5.umd.edu (Jon Greenblatt)
Organization: University of Maryland, College Park
Lines: 25

In article <6910007@hpfcdc.HP.COM> stroyan@hpfcdc.HP.COM (Mike Stroyan) writes:
>If you need more line colors than you can allocate planes for, you could
>erase lines in front of a background pixmap by drawing the lines using a
>GC which has a 'fill_style' value of 'FillTiled' and a 'tile' value of
>the background pixmap.  That should set the pixels in the line to the
>background pixmap values.  Of course, the performance may be terrible.
>
>Mike Stroyan, stroyan@hpfcla.hp.com


Here is what I do:

         Pixmap pix;
         pix = XCreateBitmapFromData(Dpy,Wnd,
                   dither_map_bits,dither_map_width,dither_map_height);
         XSetTile(Dpy,gc,pix);
         XFreePixmap(Dpy,pix);
         XSetFillStyle(Dpy,gc,FillTiled);

	Now anything including lines and filled things will use dither_map
to draw on the screen. There is a command to set the tiling origin, make
sure that is correct, the default should work fine. BTW the performance
seems to be OK.

						JonnyG.