#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;
}
boost C++library 如何将需要的坐标全部加入到polygon内
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1条回答 默认 最新
- 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; }
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