qq_26292601 2015-07-20 01:20 采纳率: 0%
浏览 1988

boost C++library 如何将需要的坐标全部加入到polygon内

 #include <iostream>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/box.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/assign/list_of.hpp>
#include <string>
namespace bg = boost::geometry;

int main()
{
      std::string a = "(0, 0)(0, 3)(3, 3)(0, 0)";
    typedef bg::model::d2::point_xy<double> point;
    typedef bg::model::box<point> box;
    typedef bg::model::polygon<point> polygon;

//    // box
//    {
//        const box x(point(0, 0), point(3, 3));
//
//        const double result = bg::area(x);
//        std::cout << result << std::endl;
//    }
    // polygon

        polygon x;
        bg::exterior_ring(x) = boost::assign::list_of<point>a;

        const double result = bg::area(x);
        std::cout << result << std::endl;

}
  • 写回答

1条回答

  • oyljerry 2015-07-21 10:26
    关注
    include <iostream>
    #include <vector>
    #include <boost/assign/std/vector.hpp>
    #include <boost/geometry.hpp>
    #include <boost/geometry/algorithms/area.hpp>
    #include <boost/geometry/algorithms/assign.hpp>
    #include <boost/geometry/geometries/point_xy.hpp>
    #include <boost/geometry/geometries/polygon.hpp>
    #include <boost/geometry/io/dsv/write.hpp>
    
    int main()
    {
        using namespace boost::assign;
        typedef boost::geometry::model::d2::point_xy<double> point_xy;
    
        // Create points to represent a 5x5 closed polygon.
        std::vector<point_xy> points;
        points +=
          point_xy(0,0),
          point_xy(0,5),
          point_xy(5,5),
          point_xy(5,0),
          point_xy(0,0)
          ;
    
        // Create a polygon object and assign the points to it.
        boost::geometry::model::polygon<point_xy> polygon;  
        boost::geometry::assign_points(polygon, points);
    
        std::cout << "Polygon " << boost::geometry::dsv(polygon) << 
          " has an area of " << boost::geometry::area(polygon) << std::endl;
    }
    
    
    评论

报告相同问题?

悬赏问题

  • ¥30 帮我写一段可以读取LD2450数据并计算距离的Arduino代码
  • ¥15 C#调用python代码(python带有库)
  • ¥15 矩阵加法的规则是两个矩阵中对应位置的数的绝对值进行加和
  • ¥15 活动选择题。最多可以参加几个项目?
  • ¥15 飞机曲面部件如机翼,壁板等具体的孔位模型
  • ¥15 vs2019中数据导出问题
  • ¥20 云服务Linux系统TCP-MSS值修改?
  • ¥20 关于#单片机#的问题:项目:使用模拟iic与ov2640通讯环境:F407问题:读取的ID号总是0xff,自己调了调发现在读从机数据时,SDA线上并未有信号变化(语言-c语言)
  • ¥20 怎么在stm32门禁成品上增加查询记录功能
  • ¥15 Source insight编写代码后使用CCS5.2版本import之后,代码跳到注释行里面