...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Checks if a geometry has at least one intersection (crossing or self-tangency)
template<typename Geometry> bool intersects(Geometry const & geometry)
Type |
Concept |
Name |
Description |
---|---|---|---|
Geometry const & |
Any type fulfilling a Geometry Concept |
geometry |
A model of the specified concept |
Returns true if the geometry is self-intersecting
Either
#include <boost/geometry/geometry.hpp>
Or
#include <boost/geometry/algorithms/intersects.hpp>
Check if two linestrings intersect each other
#include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/linestring.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/domains/gis/io/wkt/wkt.hpp> int main() { // Calculate the intersects of a cartesian polygon typedef boost::geometry::model::d2::point_xy<double> P; boost::geometry::model::linestring<P> line1, line2; boost::geometry::read_wkt("linestring(1 1,2 2,3 3)", line1); boost::geometry::read_wkt("linestring(2 1,1 2,4 0)", line2); bool b = boost::geometry::intersects(line1, line2); std::cout << "Intersects: " << (b ? "YES" : "NO") << std::endl; return 0; }
Output:
Intersects: YES