#define _USE_MATH_DEFINES

#include "../matplotlibcpp.h"

#include <cmath>

#include <iostream>

using namespace std;

namespace plt = matplotlibcpp;

#include <xtensor/xbuilder.hpp>

#include <xtensor/xtensor.hpp>

int main() {

// Prepare data.

int n = 5000;

xt::xtensor<double, 1> i = xt::linspace<double>(0, (n-1), n);

std::array<std::size_t,1> shape{static_cast<std::size_t>(n)};

xt::xtensor<double, 1> w(shape);

w.fill(2.0);

xt::xtensor<double, 1> x = xt::square(i);

xt::xtensor<double, 1> y = xt::sin(2 * xt::numeric_constants<double>::PI * i / 360.0);

xt::xtensor<double, 1> z = xt::log(i);

// Prepare keywords to pass to PolyCollection. See

// https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.fill_between.html

std::map<string, string> keywords;

keywords["alpha"] = "0.4";

keywords["color"] = "grey";

keywords["hatch"] = "-";

plt::fill_between(x, y+2, z, keywords);

plt::show();

}