Re: plotted circle is regular decagon on opengl graphics

[Rik]

On 08/10/2016 11:18 PM, address@hidden wrote:

Subject:

plotted circle is regular decagon on opengl graphics

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Tatsuro MATSUOKA <address@hidden>

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08/10/2016 11:17 PM

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Octave version : octave 4.0.3 and 4.1.0
OS windows 10
Graphics tool kit: qt and fltk

>> plot (1:1, 'o', 'markersize', 24)
>> print -depsc circle.eps

plotted circle is regular decagon (ugly).

(File is attached.)

On gnuplot graphics_tookit plotted circle is very beautiful.

Is this a know issue and a feature of opengl graphics?

Yes, it is known, although no bug report was ever filed.

I checked in this cset (http://hg.savannah.gnu.org/hgweb/octave/rev/a54d6b9c08bc) which calculates smooth circles for the 'o' and '.' markers by basing the number of angular divisions on the markersize.  It also corrects a problem where small markersizes for the dot marker were completely invisible onscreen.

--Rik