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[Octave-bug-tracker] [bug #34207] gl-render does not set tick labels for


From: Michael Godfrey
Subject: [Octave-bug-tracker] [bug #34207] gl-render does not set tick labels for log axes appropriately
Date: Mon, 05 Sep 2011 03:06:19 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20100101 Firefox/6.0

URL:
  <http://savannah.gnu.org/bugs/?34207>

                 Summary: gl-render does not set tick labels for log axes
appropriately
                 Project: GNU Octave
            Submitted by: godfrey
            Submitted on: Mon 05 Sep 2011 03:06:18 AM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Michael Godfrey
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

When using log axes with fltk the tick labels are
displayed as for linear axes.  Thus, for semilogy(1:10)
the x axis tick labels are:

1.58489   2.51189   3.98107    6.30957    10

instead of
10^0.2    10^0.4    10^0.6     10^0.8     10^1.0

or, for ML compatibility:

10^0                                      10^1

Also, ML shows tick marks as follows for semilogx(1:2):

10^0   10^0.1    10^0.2   10^0.3

and, in the ML plot  the ^xx  is actually a superscript.
Not sure if OpenGL knows how to do this.  Not too important
compared to using 10^xx for the log tick labels and reducing
the number of minor ticks.

I looked at the code in gl-render.cc, which seems to be
where this fix should go, but it was not obvious what the
correct code should be.

So, can someone with OpenGL knowledge look at this?
Michael






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