ako nájsť seba priesečník v polygóne pomocou boost /? - zvýšenie, polygón, výpočtová geometria, set-križovatka

std::string reason;
poly p;
bg::read_wkt("POLYGON((0 0, 0 4, 2 4, 2 2, 6 2, 6 6, 2 6, 2 4, 0 4, 0 8, 8 8, 8 0, 0 0))", expected);
bool ok = bg::is_valid(p, reason);
std::cout << "Expected: " << bg::dsv(p) << (ok?" valid":" invalid: "" + reason + """) << "n";

Takže toto je kód pre získanie samých priesečníkov.

namespace bg = boost::geometry;
using namespace std;
typedef bg::model::d2::point_xy<double> point_2d;
typedef bg::model::polygon<boost::geometry::model::d2::point_xy<double> > Polygon;

Polygon poly { { { 10, 10 }, { 20, 10 }, { 20, 5 }, { 25, 5 }, { 25, 7 }, { 30, 7 }, { 30, 3 }, { 25, 3 }, { 25, 5 }, { 20, 5 }, { 20, 0 }, { 10, 0 }, { 10, 10 } }};


typedef bg::point_type<Polygon>::type point_type;
typedef boost::geometry::detail::overlay::turn_info<point_type, boost::geometry::segment_ratio<double> > TurnInfoType;

bg::detail::no_rescale_policy robust_policy;
bg::detail::self_get_turn_points::no_interrupt_policy interrupt_policy;
std::vector<TurnInfoType> turns;

boost::geometry::self_turns<boost::geometry::detail::overlay::assign_null_policy>(poly.outer(), robust_policy, turns, interrupt_policy);

pre získanie informácií používajte niečo ako:

turns[i].operations[0].seg_id.segment_index