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From: RWS@ZERMATT.LCS.MIT.EDU (Robert Scheifler)
Newsgroups: comp.windows.x
Subject: X11 line patterns
Message-ID: <871027094448.6.RWS@KILLINGTON.LCS.MIT.EDU>
Date: Tue, 27-Oct-87 09:44:00 EST
Article-I.D.: KILLINGT.871027094448.6.RWS
Posted: Tue Oct 27 09:44:00 1987
Date-Received: Thu, 29-Oct-87 22:41:14 EST
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    Date: 26 Oct 87 22:06:00 GMT
    From: grogers@m.cs.uiuc.edu

    Could some kind soul please explain X11's line styles.

Read a PostScript manual (seriously).

							    In particular,
    XSetDashes and how the values in the dash_list control which pixels are
    colored.  Could you also relate this to the standard hardware line style
    register technique where a bit value of 1 means color that pixel with the
    current foreground color and a zero bit value means do nothing.

If you view dash_list[i], which let us say has value N, as representing
either N 1 bits or N 0 bits (depending on whether i is even or odd),
then you should get the idea.  Your "standard technique" corresponds to
the OnOffDash line-style (at least on axis-aligned lines).