如何在Boost庫中提取參考片段的點

Question

我在Boost中有多邊形，我試圖提取多邊形的片段，然後保存用於創建片段的點。我在C++中使用Boost庫。

我該怎麼做？

typedef boost::tuple<double, double> point; 
typedef boost::geometry::model::polygon<point> polygon; 
typedef boost::geometry::model::referring_segment<point> segment; 

template<typename Segment> 
void get_segments(Segment const& s) { 

    std::cout << "Segment is "<<dsv(s) << std::endl; 
    std::cout << "Points of this segments are :"; 
     //Extract the points of this segment somehow 


} 


int main() { 

    polygon poly; 
    boost::geometry::read_wkt(
      "polygon((2.0 1.3, 2.4 1.7, 2.8 1.8, 3.4 1.2, 3.7 1.6, 3.4 2.0, 4.1 3.0, 5.3 2.6, 5.4 1.2, 4.9 0.8, 2.9 0.7, 2.0 1.3))", 
      poly); 

    polygon hull; 
    boost::geometry::convex_hull(poly, hull); 

    // Now I know I can `dsv()` and print to the screen like this: 

    std::cout << "hull: " << dsv(hull) << std::endl; 

    boost::geometry::for_each_segment(boost::geometry::exterior_ring(hull), 
      get_segments<segment>); 


    return 0; 
} 

Answer 1

我找到了解決方案中，我使用的get（段）

template<typename Segment> 
void get_segments(Segment const& s) { 

    std::cout << "Segment is "<<dsv(s) << std::endl; 
    std::cout << "1st Point"<<get<0,0>(s)<<","<<get<0,1>(s)<<std::endl; 
    std::cout << "2nd Point"<<get<1,0>(s)<<","<<get<1,1>(s)<<std::endl;