third_party/matplotlib-cpp/examples/lines3d.cpp

#include "../matplotlibcpp.h"

#include <cmath>

namespace plt = matplotlibcpp;

int main()
{
    std::vector<double> x, y, z;
    double theta, r;
    double z_inc = 4.0/99.0; double theta_inc = (8.0 * M_PI)/99.0;
    
    for (double i = 0; i < 100; i += 1) {
        theta = -4.0 * M_PI + theta_inc*i;
        z.push_back(-2.0 + z_inc*i);
        r = z[i]*z[i] + 1;
        x.push_back(r * sin(theta));
        y.push_back(r * cos(theta));
    }

    std::map<std::string, std::string> keywords;
    keywords.insert(std::pair<std::string, std::string>("label", "parametric curve") );

    plt::plot3(x, y, z, keywords);
    plt::xlabel("x label");
    plt::ylabel("y label");
    plt::set_zlabel("z label"); // set_zlabel rather than just zlabel, in accordance with the Axes3D method
    plt::legend();
    plt::show();
}