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Assigns one geometry to another geometry.
The assign algorithm assigns one geometry, e.g. a BOX, to another geometry, e.g. a RING. This only works if it is possible and applicable.
template<typename Geometry1, typename Geometry2> void assign(Geometry1 & geometry1, Geometry2 const & geometry2)
| Type | Concept | Name | Description | 
|---|---|---|---|
| Geometry1 & | Any type fulfilling a Geometry Concept | geometry1 | A model of the specified concept (target) | 
| Geometry2 const & | Any type fulfilling a Geometry Concept | geometry2 | A model of the specified concept (source) | 
Either
            #include <boost/geometry.hpp>
          
Or
            #include <boost/geometry/algorithms/assign.hpp>
          
Shows how to assign a geometry from another geometry
#include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/box.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/adapted/boost_tuple.hpp> BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian) int main() { typedef boost::geometry::model::d2::point_xy<double> point; typedef boost::geometry::model::box<point> box; typedef boost::geometry::model::polygon<point> polygon; point p1; box b; boost::geometry::assign_values(p1, 1, 1); boost::geometry::assign_values(b, 1, 1, 2, 2); // Assign a box to a polygon (target = source) polygon p; boost::geometry::assign(p, b); // Assign a point to another point type (conversion of point-type) boost::tuple<double, double> p2; boost::geometry::assign(p2, p1); using boost::geometry::dsv; std::cout << "box: " << dsv(b) << std::endl << "polygon: " << dsv(p) << std::endl << "point: " << dsv(p1) << std::endl << "point tuples: " << dsv(p2) << std::endl ; return 0; }
Output:
box: ((1, 1), (2, 2)) polygon: (((1, 1), (1, 2), (2, 2), (2, 1), (1, 1))) point: (1, 1) point tuples: (1, 1)