On 2012-08-12 18:03-0500 Maurice LeBrun wrote:
> On Sunday, August 12, 2012 at 12:59:53 (-0700) Alan W. Irwin writes:
> > "path_includes_zero" usually does describe the mathematical meaning,
> > but that term is ambiguous for the special case when the hue range
> > ends with zero or 360 since both path alternatives in that case
> > include zero (or 360). To avoid ambiguity, how about dropping all
> > special meaning from the name and using "alt_hue_path" instead (with
> > appropriate docbook and doxygen documentation of exactly what that
> > means in a mathematical sense)?
>
> Sounds good.
Thanks, Maurice.
Andrew, if you agree with this idea as well, I would be willing to do
the rev ==> alt_hue_path name change wherever plscmap1l, plscmap1la,
PLControlPt, or cmap1cp occurs in our code base (i.e, src, bindings, and
examples, and also in the doxygen documentation that occurs in the C
code). This change, although a bit time consuming, is pretty
straightforward, and gives me a chance to contribute something to
PLplot again.
Note I would leave the corresponding rev ==> alt_hue_path docbook
documentation changes to someone else who I assume would also make
additional plscmap1l and plscmap1la documentation changes based on
what Phil has said and also include the exact mathematical definition
of a change in hue. That is currently expressed in C (see
src/plctrl.c) as
dh = plsc->cmap1cp[n + 1].h - plsc->cmap1cp[n].h;
if ( plsc->cmap1cp[n].rev )
dh = ( dh > 0 ) ? dh - 360 : dh + 360;
but should be reexpressed more generally in the docbook documentation since
not everyone understands C.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
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