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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Point size default
Date: Mon, 3 Apr 2017 13:20:49 +0200
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Am 03.04.2017 um 10:27 schrieb jacques.Lebourlot@obspm.fr:
> 
> (This was posted on "Gnuplot in Action" forum some time ago, but did
> not get any answer. I need it again...)
> 
> Point sizes are scaled from a "default" size, but I can't find the
> (terminal dependent) absolute value of this default.
> 
> I wish to set a single point (pt 6) in a 3D splot to get a fixed
> circle of (physical) size 1, in the plane of the screen, when I
> change view with the mouse. This is to illustrate 3D coordinate
> systems (see the simplified example below).
> 
> I managed to adjust the size by trial and error (45.5*sc below)), but
> it would be much more convenient to compute the scaling factor from
> known values. Hence, I need the default point size...
> 

Point sizes are defined per terminal, and not guaranteed to have a
certain absolute size.

You can either plot with style "circles", or put the circle at the
desired position directly via "set object circle".
	
   $zero << EOD
   0
   EOD
   plot $zero us 1:1:(6) with circles

or

   set object 1 circle at 0,0 size 6

hth.

 Karl