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From: klee@chico.pa.dec.com (Ken Lee)
Newsgroups: comp.windows.x
Subject: Re: Plotting Markers
Message-ID: <2355@bacchus.dec.com>
Date: 29 Dec 89 19:18:06 GMT
References: <210@hal.CSS.GOV>
Sender: news@decwrl.dec.com
Reply-To: klee@decwrl.dec.com
Organization: DEC Western Software Laboratory
Lines: 24

In article <210@hal.CSS.GOV>, nancie@hal.CSS.GOV (Nancie Matson) writes:
> I would like to find out if there is an Xlib command
> similar to the GKS command gpolymarker.  I have tried
> using the XDrawPoints command, but the points that are
> plotted to the screen are barely visible.  I was wondering
> if there is a way to resize the plotted point, or even
> change it's representation to a X, * or even a hollow circle.

The graphics facilities in X are somewhat primitive, as X is intended
to be a layer below graphics systems like PHIGS, GKS, or Display
PostScript.  If you're planning to do sophisticated graphics, you're
probably best off getting one of these higher level graphics systems,
built on top of X.  Many vendors sell them (I can recommend one :-)).

If all you need is markers, you can build a marker facility based on X
line segments, circles, pixmaps, images, and/or characters.  Use the
geometry/extents attributes to center/size the markers.  None of these
objects support resizing, moving, or repainting.  You'll have to do
that yourself.

Ken Lee
DEC Western Software Laboratory, Palo Alto, Calif.
Internet: klee@decwrl.dec.com
uucp: uunet!decwrl!klee