problem with figure size

[Ben Abbott]

On Feb 3, 2009, at 7:25 PM, Michael D. Godfrey wrote:

> After a recent update from current hg repository I found
> that figure sizing no longer works correctly for me.
> I use:
> print("haber_fig16.ps","-solid");
>
> The size of the PS graph is fixed by
>    set(gx, "position", [0.13, 0.11, 0.775, 1.14]);
> This changes the size, but the bounding box is wrong.
> If I use "-debug" and edit the first line which is unconditionally:
> set terminal postscript enhanced size 8,6 portrait mono solid
> to the size that I intended, then I can recover the size that I got
> before the latest changes to gnuplot_drawnow.m
>
> The text in gnuplot_drawnow.m which generates this line has been  
> changed
> as the diff below shows.   Something in this change has introduced  
> this
> error:
> Below is an excerpt form the diff of
> 14178 2009-01-30 16:48 gnuplot_drawnow.m
> and
> 12972 2009-01-16 00:07 gnuplot_drawnow.m
> 315,322c294,301
> <   screensize    = get (0, "screensize")(3:4);
> <   t.normalized  = screensize / t.pixels;
> <   fig_size = position(3:4) * (t.pixels / t.(units));
> <   fig_pos  = position(1:2) * (t.pixels / t.(units));
> <   fig_pos(1) = max (min (fig_pos(1), screensize(1)), 10);
> <   fig_pos(2) = max (min (fig_pos(2), screensize(2)), 10);
> <   fig_size(1) = max (min (fig_size(1), screensize(1)), 10- 
> fig_pos(1));
> <   fig_size(2) = max (min (fig_size(2), screensize(2)), 10- 
> fig_pos(2));
> ---
>>  t.normalized  = get (0, "screensize")(3:4) / t.pixels;
>>  fig_size = possize * (t.pixels / t.(units));
>>  if (prod (fig_size) > 1e8)
>>    warning ("gnuplot_drawnow: figure size is excessive. Reducing to
> 1024x768.")
>>    fig_size = [1024, 768];
>>    position = get (h, "position");
>>    set (h, "position", [position(1:2), fig_size], "units", "pixels");
>>  endif
> 325c304
>
> =======================================================
>
> I hope this information is sufficient.  A few experiments with
> print("test.ps","-debug");
> will show that the generated gnuplot file is not correct with  
> respect to
> the size values in the first line.
>
> Michael Godfrey

Michael,

I see a couple of obvious problems.

(1) The "position" property only applies to figure window location and  
size.
(2) The units for "position" are normalized, so the value [0.13, 0.11,  
0.775, 1.14] indicates the height of the axis box is 1.14 times taller  
than the figure window.

The size for printed media is specified by "papersize" and  
"paperposition". The subfunction, get_canvassize(h), is an attempt to  
translate these properties into a canvas size for gnuplot.   
Essentially, the canvas size is intended to be set equal to the size  
of the plot area.

Is the explanation consistent with your observations?

Ben