multiplot.cpp

#include <plotpp.hpp>
#include <vector>
#include <cmath>

std::vector<float> linspace(float from, float to, size_t N){
    std::vector<float> result;
    result.reserve(N);
    for (size_t i = 0; i < N; ++i) result.emplace_back(((to - from) * i) / N + from);
    return result;
}


std::vector<float> apply(const std::vector<float>& x_range, float (*func)(float x)){
    std::vector<float> result;
    result.reserve(x_range.size());
    for(const float x : x_range){
        const float y = func(x);
        result.emplace_back(y);
    }
    return result;
}

std::vector<float> sin(const std::vector<float>& x) {return apply(x, std::sin);}
std::vector<float> cos(const std::vector<float>& x) {return apply(x, std::cos);}
std::vector<float> tan(const std::vector<float>& x) {return apply(x, std::sinh);}

int main(){
    using namespace plotpp;

    const auto x = linspace(-3.1415, 3.1415, 50);

    /*
    The plotting devices are crafted in a way to avoid unnecessary copies. 
    Data is taken by reference/pointers and optionally owned.

        pass by:
            * lvalue reference  --> plot will store a pointer to the data
            * rvalue reference  --> plot will move the data into a smart_pointer that holds the data
            * shared_ptr        --> plot will take the smart_pointer
            * unique_ptr        --> plot will move the unique_ptr
            * raw_ptr           --> plot will store a pointer to the data
    */
    Multiplot mplt(2, 2, "Multiplot");
    mplt.at(0, 0).add(line(&x, sin(x)).label("Top-Left"));
    mplt.at(0, 1).add(
        points(
            std::make_shared<std::vector<float>>(x), 
            std::make_unique<std::vector<float>>(cos(x))
        ).label("Top-Right")
    );
    mplt.at(1, 1).add(line(&x, tan(x)).label("Bottom-Right"));
    mplt.show();
    mplt.save("multiplot.svg");

    return 0;
}

Filename: multiplot.cpp

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Updated on 2025-03-11 at 16:08:10 +0100