...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Calculates the relation between a pair of geometries as defined in DE-9IM.
template<typename Geometry1, typename Geometry2> de9im::matrix relation(Geometry1 const & geometry1, Geometry2 const & geometry2)
Type |
Concept |
Name |
Description |
---|---|---|---|
Geometry1 const & |
Any type fulfilling a Geometry Concept |
geometry1 |
A model of the specified concept |
Geometry2 const & |
Any type fulfilling a Geometry Concept |
geometry2 |
A model of the specified concept |
The DE-9IM matrix expressing the relation between geometries.
Either
#include <boost/geometry.hpp>
Or
#include <boost/geometry/algorithms/relation.hpp>
This function is additional and not described in the OGC standard. The spatial relation is represented by DE-9IM matrix.
Shows how to calculate the spatial relation between a point and a polygon
#include <iostream> #include <string> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> int main() { using point_type = boost::geometry::model::d2::point_xy<double>; using polygon_type = boost::geometry::model::polygon<point_type>; polygon_type poly; boost::geometry::read_wkt( "POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)" "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", poly); point_type p(4, 1); boost::geometry::de9im::matrix matrix = boost::geometry::relation(p, poly); std::string code = matrix.str(); std::cout << "relation: " << code << std::endl; return 0; }
Output:
relation: 0FFFFF212