...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, 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