matplotlib c++ 3维图像更新问题

Question

问题遇到的现象和发生背景

我在使用matplotlib c++版本过程中，想实时绘制3维度坐标数据；实际运行中发现无法只更新画布，且实际效果创建了很多张图，我应该怎么修改代码呢

用代码块功能插入代码，请勿粘贴截图

#define _USE_MATH_DEFINES
#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);
        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::pause(0.01);
    }
}

运行结果及报错内容

我想要达到的结果

在这个坐标轴中更新画面

Answer 1

#define _USE_MATH_DEFINES

#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;

    plt::figure(1);//新建画板1

    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::cla();//清楚当前axes内容

        plt::plot3(x, y, z, {}, 1);//在画板1上画

        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::pause(0.01);

    }

}