Re: [Gnuplot-info] Scaling and cropping

[Tatsuro M. <tma...@ya...>]

Hello


I cannot understand what is RIGHT.
However the relation between plot size and canvas size seemed to be complicated for gnuplot.

I refer 'help canvas' of gnuplot 4.3 (cvs)
 
************
In earlier versions of gnuplot, some terminal types used the values from set size to control also the
size of the output canvas; others did not. The use of 'set size' for this purpose was deprecated in
version 4.2. In version 4.3 almost all terminals now behave as follows: 

set term <terminal_type> size <XX>, <YY> controls the size of the output file, or "canvas". Please see
individual terminal documentation for allowed values of the size parameters.  By default, the plot
will fill this canvas. 

set size <XX>, <YY> scales the plot itself relative to the size of the canvas.  Scale values less than
1 will cause the plot to not fill the entire canvas.  Scale values larger than 1 will cause only a
portion of the plot to fit on the canvas.  Please be aware that setting scale values larger than 1 may
cause problems on some terminal types. 

The major exception to this convention is the PostScript driver, which by default continues to act as
it has in earlier versions. Be warned that the next version of gnuplot may change the default
behaviour of the PostScript driver as well. 

Example: 

      set size 0.5, 0.5
      set term png size 600, 400
      set output "figure.png"
      plot "data" using lines

These commands will produce an output file "figure.png" that is 600 pixels wide and 400 pixels tall.
The plot will fill the lower left quarter of this canvas.  This is consistent with the way multiplot
mode has always worked, however it is a change in the way the png driver worked for single plots in
version 4.0. In earlier versions of gnuplot, some terminal types used the values from set size to
control also the size of the output canvas; others did not. The use of 'set size' for this purpose was
deprecated in version 4.2. In version 4.3 almost all terminals now behave as follows: 

set term <terminal_type> size <XX>, <YY> controls the size of the output file, or "canvas". Please see
individual terminal documentation for allowed values of the size parameters.  By default, the plot
will fill this canvas. 

set size <XX>, <YY> scales the plot itself relative to the size of the canvas.  Scale values less than
1 will cause the plot to not fill the entire canvas.  Scale values larger than 1 will cause only a
portion of the plot to fit on the canvas.  Please be aware that setting scale values larger than 1 may
cause problems on some terminal types. 

The major exception to this convention is the PostScript driver, which by default continues to act as
it has in earlier versions. Be warned that the next version of gnuplot may change the default
behaviour of the PostScript driver as well. 

Example: 

      set size 0.5, 0.5
      set term png size 600, 400
      set output "figure.png"
      plot "data" using lines

These commands will produce an output file "figure.png" that is 600 pixels wide and 400 pixels tall.
The plot will fill the lower left quarter of this canvas.  This is consistent with the way multiplot
mode has always worked, however it is a change in the way the png driver worked for single plots in
version 4.0. 

*******************************************************

Automatically resizing of of eps terminal may perhaps rely on the ability 
automatically surrounding box abibility of the eps terminal.

For other terminal, the reult that cavas size does not change for according to 'set size' is RIGHT
behavior.  If you want change the size of ascept ratio of the canvas, please control it by 

set term (term name) size 600, 400



Regards

Tatsuro



--- Yang Zhang <yan...@gm...> wrote:

> When I do "set size [<1 ratio]", for many terminals, there remains a 
> space surrounding the figure because the canvas itself is not resized. 
> I've seen this in pdf and emf; it does not happen with postscript eps. 
> These are the only three terms I've tried.
> 
> For pdf, I can use pdfcrop, but it won't be cropped the same for all 
> plots, and this doesn't work for emf.  Does anybody know of a way to 
> just have gnuplot produce the "right" output (cropping/resizing the 
> "canvas")?
> 
> Thanks!
> 
> -- 
> Yang Zhang
> http://www.mit.edu/~y_z/
> 
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