问题描述
- 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; }
解决方案
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;
}
时间: 2024-07-28 13:54:14