CppGnuplotExample6.md

 

 

 

 

 

(C++) gnuplot example 6: creating and displaying a scatter plot

 

gnuplot example 6 is a gnuplot example.

 

• View a screenshot of this example (png)
• Download the Qt Creator project 'CppGnuplotExample6' (zip)

 

 

 

 

 

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: CppGnuplotExample6.pro

 

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TEMPLATE = app CONFIG += console CONFIG += qt SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

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#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;     for (int x = 0; x!=maxx; ++x)     {       const double f_x = static_cast<double>(x) / static_cast<double>(maxx);       const double x_co = f_x * 2.0 * M_PI;       const double y = std::cos(x_co);       f << x_co << " " << y << '\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 title \"Example 6\"\n"       "set xlabel \"X coordinat\"\n"       "set ylabel \"Y coordinat\"\n"       "plot \"" << dat_filename<< "\" with lines\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(); }