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example.cc
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example.cc
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// Example for C++ Interface to Gnuplot
// requirements:
// * gnuplot has to be installed (http://www.gnuplot.info/download.html)
// * for Windows: set Path-Variable for Gnuplot path (e.g. C:/program files/gnuplot/bin)
// or set Gnuplot path with: Gnuplot::set_GNUPlotPath(const std::string &path);
#include <iostream>
#include "gnuplot_i.hpp" //Gnuplot class handles POSIX-Pipe-communikation with Gnuplot
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
#include <conio.h> //for getch(), needed in wait_for_key()
#include <windows.h> //for Sleep()
void sleep(int i)
{
Sleep(i*1000);
}
#endif
#define SLEEP_LGTH 2 // sleep time in seconds
#define NPOINTS 50 // length of array
void wait_for_key(); // Programm halts until keypress
using std::cout;
using std::endl;
int main()
{
// if path-variable for gnuplot is not set, do it with:
// Gnuplot::set_GNUPlotPath("C:/program files/gnuplot/bin/");
#if defined(__APPLE__)
// set a special standard terminal for showonscreen (normally not needed),
// e.g. Mac users who want to use x11 instead of aqua terminal:
Gnuplot::set_terminal_std("x11");
#endif
cout << "*** example of gnuplot control through C++ ***" << endl << endl;
//
// Using the GnuplotException class
//
try
{
Gnuplot g1("lines");
//
// Slopes
//
cout << "*** plotting slopes" << endl;
g1.set_title("Slopes\\nNew Line");
cout << "y = x" << endl;
g1.plot_slope(1.0,0.0,"y=x");
cout << "y = 2*x" << endl;
g1.plot_slope(2.0,0.0,"y=2x");
cout << "y = -x" << endl;
g1.plot_slope(-1.0,0.0,"y=-x");
g1.unset_title();
//
// Equations
//
g1.reset_plot();
cout << endl << endl << "*** various equations" << endl;
cout << "y = sin(x)" << endl;
g1.plot_equation("sin(x)","sine");
cout << "y = log(x)" << endl;
g1.plot_equation("log(x)","logarithm");
cout << "y = sin(x) * cos(2*x)" << endl;
g1.plot_equation("sin(x)*cos(2*x)","sine product");
//
// Styles
//
g1.reset_plot();
cout << endl << endl << "*** showing styles" << endl;
cout << "sine in points" << endl;
g1.set_pointsize(0.8).set_style("points");
g1.plot_equation("sin(x)","points");
cout << "sine in impulses" << endl;
g1.set_style("impulses");
g1.plot_equation("sin(x)","impulses");
cout << "sine in steps" << endl;
g1.set_style("steps");
g1.plot_equation("sin(x)","steps");
//
// Save to ps
//
g1.reset_all();
cout << endl << endl << "*** save to ps " << endl;
cout << "y = sin(x) saved to test_output.ps in working directory" << endl;
// g1.savetops("test_output");
g1.savetofigure("test_output.ps", "postscript color");
g1.set_style("lines").set_samples(300).set_xrange(0,5);
g1.plot_equation("sin(12*x)*exp(-x)").plot_equation("exp(-x)");
g1.showonscreen(); // window output
//
// User defined 1d, 2d and 3d point sets
//
std::vector<double> x, y, y2, dy, z;
for (unsigned int i = 0; i < NPOINTS; i++) // fill double arrays x, y, z
{
x.push_back((double)i); // x[i] = i
y.push_back((double)i * (double)i); // y[i] = i^2
z.push_back( x[i]*y[i] ); // z[i] = x[i]*y[i] = i^3
dy.push_back((double)i * (double)i / (double) 10); // dy[i] = i^2 / 10
}
y2.push_back(0.00);
y2.push_back(0.78);
y2.push_back(0.97);
y2.push_back(0.43);
y2.push_back(-0.44);
y2.push_back(-0.98);
y2.push_back(-0.77);
y2.push_back(0.02);
g1.reset_all();
cout << endl << endl << "*** user-defined lists of doubles" << endl;
g1.set_style("impulses").plot_x(y,"user-defined doubles");
g1.reset_plot();
cout << endl << endl << "*** user-defined lists of points (x,y)" << endl;
g1.set_grid();
g1.set_style("points").plot_xy(x,y,"user-defined points 2d");
g1.reset_plot();
cout << endl << endl << "*** user-defined lists of points (x,y,z)" << endl;
g1.unset_grid();
g1.plot_xyz(x,y,z,"user-defined points 3d");
g1.reset_plot();
cout << endl << endl << "*** user-defined lists of points (x,y,dy)" << endl;
g1.plot_xy_err(x,y,dy,"user-defined points 2d with errorbars");
//
// Multiple output screens
//
cout << endl << endl;
cout << "*** multiple output windows" << endl;
g1.reset_plot();
g1.set_style("lines");
cout << "window 1: sin(x)" << endl;
g1.set_grid().set_samples(600).set_xrange(0,300);
g1.plot_equation("sin(x)+sin(x*1.1)");
g1.set_xautoscale().replot();
Gnuplot g2;
cout << "window 2: user defined points" << endl;
g2.plot_x(y2,"points");
g2.set_smooth().plot_x(y2,"cspline");
g2.set_smooth("bezier").plot_x(y2,"bezier");
g2.unset_smooth();
Gnuplot g3("lines");
cout << "window 3: log(x)/x" << endl;
g3.set_grid();
g3.plot_equation("log(x)/x","log(x)/x");
Gnuplot g4("lines");
cout << "window 4: splot x*x+y*y" << endl;
g4.set_zrange(0,100);
g4.set_xlabel("x-axis").set_ylabel("y-axis").set_zlabel("z-axis");
g4.plot_equation3d("x*x+y*y");
Gnuplot g5("lines");
cout << "window 5: splot with hidden3d" << endl;
g5.set_isosamples(25).set_hidden3d();
g5.plot_equation3d("x*y*y");
Gnuplot g6("lines");
cout << "window 6: splot with contour" << endl;
g6.set_isosamples(60).set_contour();
g6.unset_surface().plot_equation3d("sin(x)*sin(y)+4");
g6.set_surface().replot();
Gnuplot g7("lines");
cout << "window 7: set_samples" << endl;
g7.set_xrange(-30,20).set_samples(40);
g7.plot_equation("besj0(x)*0.12e1").plot_equation("(x**besj0(x))-2.5");
g7.set_samples(400).replot();
Gnuplot g8("filledcurves");
cout << "window 8: filledcurves" << endl;
g8.set_legend("outside right top").set_xrange(-5,5);
g8.plot_equation("x*x").plot_equation("-x*x+4");
//
// Plot an image
//
Gnuplot g9;
cout << "window 9: plot_image" << endl;
const int unsigned uiWidth = 255U;
const int unsigned uiHeight = 255U;
g9.set_xrange(0,uiWidth).set_yrange(0,uiHeight).set_cbrange(0,255);
g9.cmd("set palette gray");
unsigned char ucPicBuf[uiWidth*uiHeight];
// generate a greyscale image
for(unsigned int uiIndex = 0; uiIndex < uiHeight*uiWidth; uiIndex++)
{
ucPicBuf[uiIndex] = static_cast<unsigned char>(uiIndex%255U);
}
g9.plot_image(ucPicBuf,uiWidth,uiHeight,"greyscale");
g9.set_pointsize(0.6).unset_legend().plot_slope(0.8,20);
//
// manual control
//
Gnuplot g10;
cout << "window 10: manual control" << endl;
g10.cmd("set samples 400").cmd("plot abs(x)/2"); // either with cmd()
g10 << "replot sqrt(x)" << "replot sqrt(-x)"; // or with <<
wait_for_key();
}
catch (GnuplotException &ge)
{
cout << ge.what() << endl;
}
cout << endl << "*** end of gnuplot example" << endl;
return 0;
}
void wait_for_key ()
{
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__) // every keypress registered, also arrow keys
cout << endl << "Press any key to continue..." << endl;
FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
_getch();
#elif defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
cout << endl << "Press ENTER to continue..." << endl;
std::cin.clear();
std::cin.ignore(std::cin.rdbuf()->in_avail());
std::cin.get();
#endif
return;
}