[英]Why boost::geometry::intersection does not work correct?
我為Boost幾何交叉函數編寫了下一個測試函數
typedef boost::geometry::model::polygon<boost::tuple<int, int> > Polygon;
void test_boost_intersection() {
Polygon green, blue;
boost::geometry::read_wkt("POLYGON((0 0,0 9,9 9,9 0,0 0))", green);
boost::geometry::read_wkt("POLYGON((2 2,2 9,9 9,9 2,2 2))", blue);
std::deque<Polygon> output;
boost::geometry::intersection(green, blue, output);
BOOST_FOREACH(Polygon const& p, output)
{
std::cout << boost::geometry::dsv(p) << std::endl;
}
};
我期望輸出結果如下:
(((2, 2), (2, 9), (9, 9), (9, 2), (2, 2)))
但我得到了:
((((1, 9), (9, 9), (9, 2), (2, 2), (1, 9))))
我使用Boost 1.54。
如果我改變第一個多邊形,交叉點工作正確。
編輯:當我改變多邊形的類型
boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double> >
它開始正常工作。 所以我不能一直使用以前的類型嗎?
您需要correct
輸入多邊形以滿足算法前提條件: Live On Coliru打印
(((2, 9), (9, 9), (9, 2), (2, 2), (2, 9)))
#include <boost/tuple/tuple.hpp>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/geometries/adapted/boost_tuple.hpp>
#include <boost/foreach.hpp>
typedef boost::geometry::model::polygon<boost::tuple<int, int> > Polygon;
BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
void test_boost_intersection() {
Polygon green, blue;
boost::geometry::read_wkt("POLYGON((0 0,0 9,9 9,9 0,0 0))", green);
boost::geometry::read_wkt("POLYGON((2 2,2 9,9 9,9 2,2 2))", blue);
boost::geometry::correct(green);
boost::geometry::correct(blue);
std::deque<Polygon> output;
boost::geometry::intersection(green, blue, output);
BOOST_FOREACH(Polygon const& p, output)
{
std::cout << boost::geometry::dsv(p) << std::endl;
}
}
int main()
{
test_boost_intersection();
}
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