从Boost Geometry多边形获取点的坐标

#include<iostream>
#include<vector>
#include<boost/geometry.hpp>
#include<boost/geometry/geometries/point_xy.hpp>
#include<boost/geometry/geometries/polygon.hpp>

namespace bg = boost::geometry;
typedef bg::model::d2::point_xy<double> point_type;
typedef bg::model::polygon<point_type> polygon_type;

int main()
{
    // 创建一个多边形
    polygon_type poly;
    bg::exterior_ring(poly).push_back(point_type(0, 0));
    bg::exterior_ring(poly).push_back(point_type(0, 1));
    bg::exterior_ring(poly).push_back(point_type(1, 1));
    bg::exterior_ring(poly).push_back(point_type(1, 0));
    bg::exterior_ring(poly).push_back(point_type(0, 0));

    // 获取多边形的点的坐标
    std::vector<point_type> points;
    bg::exterior_ring(poly, points);

    // 输出点的坐标
    for (const auto& point : points)
    {
        std::cout << "(" << bg::get<0>(point) << ", " << bg::get<1>(point) << ")"<< std::endl;
    }

    return 0;
}