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Calculates the relation between a pair of geometries as defined in DE-9IM.
template<typename Geometry1, typename Geometry2, typename Strategy> de9im::matrix relation(Geometry1 const & geometry1, Geometry2 const & geometry2, Strategy const & strategy)
| 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 | 
| Strategy const & | Any type fulfilling a Relation Strategy Concept | strategy | The strategy which will be used for relation calculations | 
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() { typedef boost::geometry::model::d2::point_xy<double> point_type; typedef boost::geometry::model::polygon<point_type> polygon_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