119 lines (66 loc) · 6.51 KB

(C++) gnuplot example 4: creating and displaying a surface plot

gnuplot example 4 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: CppGnuplotExample4.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()); for (double y = -10.0; y < 10.0; y+=0.2) { for (double x = -10.0; x < 10.0; x+=0.2) { const double z = std::cos(x) std::sin(y); 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 50,50,2\n" "set dummy u,v\n" "set pm3d implicit at s\n" "set hidden3d\n" "set key inside right top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000\n" "set style data lines\n" "set title \"Example 4\"\n" "set xlabel \"X coordinat\"\n" "set ylabel \"Y coordinat\"\n" "set zlabel \"Z value\"\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(); }