From octave-maintainers-request at bevo dot che dot wisc dot edu Wed Jan 28 20:52:22 2004
Subject: Re: contour plots and doing graphics in octave
From: Paul Kienzle <pkienzle at users dot sourceforge dot net>
To: Donald J Bindner <dbindner at vh224401 dot truman dot edu>
Cc: octave-maintainers at bevo dot che dot wisc dot edu
Date: Wed, 28 Jan 2004 21:51:03 -0500

Ideally you should create a routine which returns the lines you
want to draw, and leave it to another routine to do the
plotting.  That allows flexibility in choosing a plotting
package.

If you need to do the plotting from C++, I would
recommend using feval to call the usual plot scripts
rather trying to tie directly into the stream.  Something like:

   #include <octave/parse.h>
   ...
   octave_value_list in;
   in(2) = "x;my line;";
   in(1) = Y;
   in(0) = X;
   feval("plot",in,0); // nargout==0


Paul Kienzle
pkienzle at users dot sf dot net

On Jan 28, 2004, at 4:48 PM, Donald J Bindner wrote:
>
> My question in a nutshell is this.  From a dynamically linked
> function, how do I create graphics?  There is a
> send_to_plot_stream() in pt-plot.cc but its symbol is not
> exported, except through the graw() function.  I see that there
> are structures, tree_plot_command, etc., but I don't understand
> what to do with them.  And I can't seem to trace from plot.m ->
> __plt__.m --> __plt2__.m --> to the point where it interfaces
> with the C++ code.