(C++) gnuplot example 5: creating and displaying a contour plot

gnuplot example 5 is a gnuplot example.

Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 12.04 (precise)
Windows XP

IDE(s):

Qt Creator 2.4.1

Project type:

C++ standard:

C++98

Compiler(s):

G++ 4.6.3

Libraries used:

STL: GNU ISO C++ Library, version 4.6.3

Qt project file: CppGnuplotExample5.pro


TEMPLATE = app


CONFIG += console


CONFIG += qt





SOURCES += main.cpp

main.cpp


#include <cmath>


#include <fstream>


#include <string>


#include <cstdlib>


#include <QApplication>


#include <QLabel>





int main(int argc, char *argv[])


{


  QApplication a(argc,argv);





  const std::string dat_filename = "test.data";





  //Create data file


  {


    std::ofstream f(dat_filename.c_str());


    const int maxx = 100;


    const int maxy = 100;


    for (int y = 0; y!=maxx; ++y)


    {


      for (int x = 0; x!=maxy; ++x)


      {


        const double f_x = static_cast<double>(x) / static_cast<double>(maxx);


        const double f_y = static_cast<double>(y) / static_cast<double>(maxy);


        const double x_co = f_x * 2.0 * M_PI;


        const double y_co = f_y * 3.0 * M_PI;


        const double z = (std::cos(x_co) * std::sin(y_co));


        f << x << " " << y << " " << z << '\n';


      }


    }


  }





  #ifdef WIN32


  const std::string exe = "C:\\Progra~1\\gnuplot\\bin\\gnuplot.exe";


  #else


  const std::string exe = "gnuplot";


  #endif





  const std::string cmd_filename = "test.txt";


  const std::string pic_filename = "test.png";





  {


    std::ofstream f(cmd_filename.c_str());





    f <<


      "set terminal pngcairo\n"


      "set output '" << pic_filename <<"'\n"


      "set dgrid3d 100,100,1\n"


      "set pm3d map\n"


      "set title \"Example 5\"\n"


      "set xlabel \"X coordinat\"\n"


      "set ylabel \"Y coordinat\"\n"


      "splot \"" << dat_filename<< "\"\n";


  }





  const std::string cmd = exe + " " + cmd_filename;





  std::system(cmd.c_str());





  QLabel label;


  label.setPixmap(QPixmap(pic_filename.c_str()));


  label.show();





  return a.exec();


}

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