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(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

Qt Creator 2.4.1

C++98

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(); }