Re: 'paperpositionmode' change to rid gnuplot_set_term: size is zero

[Ben Abbott]

On Jan 3, 2009, at 5:07 PM, Michael Goffioul wrote:

> On Sat, Jan 3, 2009 at 9:38 PM, Ben Abbott <address@hidden> wrote:
> > In a nutshell ... I'd like to be able to set the default values for
> > properties representing vectors. For example, figure.paperposition  
> > where
> > we'd like the default to be [0.25, 2.5, 8, 6]. I don't see how this  
> > can be
> > done. In graphics.h.in I can set each element to the same value  
> > (all zeros
> > for example), but I don't see how to set the default to a vector with
> > differing values.
>
> You can't. To achieve that, you have to use an indirect way. See for
> instance what I did to set the default figure position in  
> graphics.h.in.
> Another way would be to have a utility function like
>
>  Matrix make_vector(int n, ...)
>
> that you could use in graphics.h.in to initialize properties with
> predefined vector. The implementation of such function would use
> stdargs.h or varargs.h.
>
> > Then there is the problem that the defaults are set after the  
> > callbacks are
> > in place, which changes some of the defaults. As you point out this  
> > can be
> > easily fixed, but I'd think it more proper to set the defaults  
> > prior to
> > setting up the callbacks.
>
> I'm not sure what's the best in this specific case. If you want to
> force a default value for xtick, then it makes sense to also have
> xtickmode set to manual, otherwise your default xtick value would
> be useless and immediately overwritten by the system as xtickmode
> would be auto. Could anybody check what happens under Matlab:
>
> close all
> set(0, 'defaultaxesxtick', [0:1:10])
> get(gca, 'xtick')
> get(gca, 'xtickmode')
>
> Michael.


Michael/others,

I've essentially mimicked prior examples in order to set the defaults  
for ...

axes.xticks
axes.yticks
axes.zticks
figure.papersize
figure.paperposition
root.screensize

I've also attempted to add the "character" unit to  
graphics:convert_positon(...)

There is a typo for the radio value "pixels" for the property  
text.fontunits which is fixed as well.

I'd appreciate some advice/critque regarding the attached changeset.

Beyond these changes, I'd also like to see the axes.xticklabel /  
yticklabel / zticklabel updated when the xtick / ytick / ztick is  
set.  I have not looked into how the listeners are handled on the c++  
side yet, so I can't ask any intelligent questions. However, it  
appears to me that it would be proper to set the initial  
axes.xticklabel / yticklabel / zticklabel default values. However, I  
have been unable to figure that out.

Is it possible to set the ticklabels using a function (in graphics.cc)  
as is done for numeric values (for example the one below)

 static Matrix
default_axes_tick (void)
{
  Matrix m (1, 6, 0.0);
  m(0) = 0.0;
  m(1) = 0.2;
  m(2) = 0.4;
  m(3) = 0.6;
  m(4) = 0.8;
  m(5) = 1.0;
  return m;
}

Where graphics.h.in would then have

      row_vector_property xtick m , default_axes_tick ()
      row_vector_property ytick m , default_axes_tick ()
      row_vector_property ztick m , default_axes_tick ()

My naive guess would be to replace "Matrix" with "octave_value" (which  
I'd bet is wrong, because I can't find any such examples in the code).  
Beyond that I have no clue how to specify a cell array of strings.

More advice would be appreciated.

Ben

changeset-properties.patch
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