(C++) gnuplot example 2: creating and displaying a plot

gnuplot example 2 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: CppGnuplotExample2.pro


TEMPLATE = app


CONFIG += console


CONFIG += qt





SOURCES += main.cpp

main.cpp


#include <fstream>


#include <string>


#include <cstdlib>


#include <QApplication>


#include <QLabel>





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


{


  QApplication a(argc,argv);





  #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 key inside left top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000\n"


      "set samples 50, 50\n"


      "plot [-10:10] sin(x),atan(x),cos(atan(x))";


  }





  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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