Re: pngcairo: suggestion for additional option

[Ethan M. <merritt@u.washington.edu>]

On Wednesday 21 November 2007 16:01, Allin Cottrell wrote:
> 
> > Version 4.2.2 has quite a lot of this already your finger tips, 
> > by way of gnuplot-defined variables GPVAL_X_MIN etc.  Adding 
> > GRAPH_XLEFT etc. shouldn't pose a major problem.
> 
> Sorry, I don't really understand.  There's no difficulty at all 
> calculating/retrieving this information inside gnuplot.  The issue 
> is how to make it available to the outside world -- that is, to 
> another program that has called gnuplot to make a plot file, and 
> wants to know some internal properties of the file.

I believe the suggestion was that one could achieve this by the
following lines:

  set print "plot_coords.dat"
  print "x limits: ", GPVAL_X_MIN, GPVAL_X_MAX
  print "x2 limits: ", GPVAL_X2_MIN, GPVAL_X2_MAX
  print "y limits: ", GPVAL_Y_MIN, GPVAL_Y_MAX
  print "y2 limits: ", GPVAL_Y2_MIN, GPVAL_Y2_MAX
  print "graph limits: ", GPVAL_GRAPH_XMIN, GPVAL_GRAPH_XMAX
  ... and so on

In other words, no need for a special terminal option.
The existing print mechanism would allow flexibility as to
file format and exactly what information is saved.

-- 
Ethan A Merritt