Re: [Gnuplot-info] call gnuplot from c++ (windows)

[Robbie M. <ro...@ac...>]

------------------------------------------------------------
To:           Benjamin von Ardenne <ben...@gm...>
Subject:      Re: [Gnuplot-info] call gnuplot from c++ (windows)
Message-ID:  <201...@ju...>
From:         Mathias Anselmann <mat...@li...>
Date:         Fri, 26 Aug 2011 12:36:26 +0200
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Hello Mathias

> So has anybody got a clue for me here?

Here is an extract of the code I use, based on code by
Daniel Stahlke.  My platform is GCC + Linux and not Windows.

I remember having to experiment quite a lot to get
the run-time behaviors I want.  I also use the "dumb"
during unit testing so that I don't create plot windows.

Note that I set PERSIST as a gnuplot statement and NOT
as a command-line option.  Maybe that will work for you?

I'm happy to forward all my code for this unit, if that
would help.  GPLv3 + the MIT license from Daniel.

good luck, Robbie

//// HEADER

#include <boost/iostreams/stream.hpp>                  // stream template
for io
#include <boost/iostreams/device/file_descriptor.hpp>  // filesystem access

class Gnuplot :
  public boost::iostreams::stream<boost::iostreams::file_descriptor_sink>
{
public:

  explicit
  Gnuplot
  (const std::string cmd);

  ~Gnuplot();

  // BEHAVIOR SET FUNCTIONS

  void setTerminal(const std::string& term);   // "dumb" "x11" "wxt"
  void setPersist();                           // plot window remains

  // DATA

private:

  FILE*                pout;                 // C-style stdlib io
  std::string          gnuplotTerm;          // Gnuplot terminal device

}; // class 'Gnuplot'

//// IMPLEMENTATION

void
Gnuplot::setTerminal(const std::string& term)     // "dumb" "x11" "wxt"
{
  const bool supported = ( term == "dumb" ||
                           term == "x11"  ||
                           term == "wxt" );
  if ( supported ) logme("term = '" + term + "'");
  else             logme("WARNING: gnuplot terminal type not tested: " +
term);

  gnuplotTerm = term;                        // store value
  *this << "set terminal " << gnuplotTerm << std::endl;
}

void
Gnuplot::setPersist()                        // plot window remains open
{
  *this << "set terminal " << gnuplotTerm << " persist" << std::endl;
}

//// USAGE

Gnuplot gp("gnuplot");  // gnuplot invocation string
gp.setTerminal("wxt");
gp.setPersist();        // sets persist

gp << "set xrange [-2:2]" << "\n";
...

---
Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : mor...@ie...
Webmail (preferred)           : ro...@ac...
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