Xref: utzoo comp.windows.x:34351 comp.windows.x.motif:2241
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!lll-winken!lll-crg.llnl.gov
From: chapman@lll-crg.llnl.gov (Carol Chapman)
Newsgroups: comp.windows.x,comp.windows.x.motif,ba.windows.x,llnl.x
Subject: Need real-time plotting update algorithm
Keywords: how often to update plot?, custom widget, Motif 1.1, C
Message-ID: <93681@lll-winken.LLNL.GOV>
Date: 22 Mar 91 03:58:53 GMT
Sender: usenet@lll-winken.LLNL.GOV
Followup-To: comp.windows.x
Organization: Livermore National Laboratory
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Nntp-Posting-Host: lll-crg.llnl.gov

I am in search of a good algorithm for updating a real-time plot.  The
plotting may be done in just about any unit of time:  seconds,
minutes, hours, etc. and there may be multiple plots on one graph.  I
need to calculate how often I can update each plot.  The user won't be
able to see a difference if I update too often, but will complain
bitterly if updates don't occur often enough.  I believe I also need
to take into account how many plots are on the graph, so that they
don't slow each other down in their haste to update.  My X axis represents
time.  The plotter is a widget (custom), so I know I will have to recalculate
everytime the widget is resized.  

Surely someone out there has dealt with this before?

thanx,
carol

P.S.  I'm using C and Motif 1.1 on a VMS system, if that makes a
difference.

Carol Chapman                                        Tel. (415) 423-7876
Livermore National Laboratory                NEW -->  chapman@.llnl.gov
P. O. Box 808, L-572            "Are you in charge here?"
Livermore, CA  94550            "No, but I'm full of ideas!"  -- Dr. Who