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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: setting absolute size of point (or circle) with autoscaled xrange
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Date: Thu, 07 Feb 2013 09:04:31 -0800
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fearless_fool wrote:

> I understand that the size of a circle or point is in units of the x
> axis.  But what if I want to set the circle size to an absolute number
> of pixels, or percentage of the plot area?

See "help set style circle"

  set style circle radius screen 0.01
  plot "-" using 1:2 with circles

	Ethan

> 
> In particular, what if I want to set the circle size to the same as
> shown in the legend?
> 
> I'm currently doing a scatter plot as shown below.  I compute the
> circle size (shown below as 0.667) by pawing over the x values to get
> the min and max and scaling the size relative to that.  This sort of
> works, except that the autoscaling limits are not the same as the
> minimum and maximum of the data: ===== set terminal aqua enhanced font
> "Helvetica, 14"
> 
> plot "-" using 1:2:(0.667) title "{/Helvetica=12 predicted}" with
> circles fillstyle solid noborder linecolor rgb "#ff4444" 9.0
> 26870.488225 10.74 26622.450975
> 12.48 26375.879575
> ...
> 94.26 17585.44715
> end
> =====
> Another approach would be do to a dry run (i.e. "set table /dev/null;
> plot etc; unset table") and capture the values of GPVAL_XMIN and
> GPVAL_XMAX to see where autoscaling set them, then scale the circle
> size accordingly.
> 
> (I'd hoped I could do something like '... with circles size screen
> 0.01 ...' but no luck.)
> 
> Is there an easier way?