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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Example combining Boost.Geometry with Boost.Assign and Boost.Range and Boost.Tuple
+
+#include <iostream>
+
+#include <boost/geometry/geometry.hpp>
+#include <boost/geometry/geometries/point_xy.hpp>
+#include <boost/geometry/geometries/linestring.hpp>
+#include <boost/geometry/geometries/polygon.hpp>
+#include <boost/geometry/geometries/adapted/boost_tuple.hpp>
+
+#include <boost/assign.hpp>
+
+BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian);
+
+
+int main(void)
+{
+ using namespace boost::geometry;
+ using namespace boost::assign;
+
+ {
+ typedef model::d2::point_xy<double> point;
+ typedef model::polygon<point> polygon;
+ typedef model::linestring<point> linestring;
+
+ // Boost.Assign automatically works for linestring, rings, multi-geometries
+ // It works because these are std:: containers
+
+ // Using Boost.Assign operator +=
+ linestring ls1;
+ ls1 += point(1,2);
+ ls1 += point(3,4), point(5,6), point(7,8);
+ std::cout << dsv(ls1) << std::endl;
+
+ // Using Boost.Assign operator()
+ linestring ls2;
+ push_back(ls2)(point(1, 2))(point(3, 4));
+ std::cout << dsv(ls2) << std::endl;
+
+ // Using Boost.Assign list_of
+ linestring ls3 = list_of(point(1,2))(point(3,4));
+ std::cout << dsv(ls3) << std::endl;
+
+ // Using Boost.Assign + Boost.Range
+ linestring ls4;
+ push_back(ls4)(point(0, 0)).range(ls2).range(ls3);
+ std::cout << dsv(ls4) << std::endl;
+
+ // For a ring, it is similar to a linestring.
+ // For a multi-point or multi-linestring, it is also similar
+ // For a polygon, take the exterior ring or one of the interiors
+ polygon p;
+ push_back(exterior_ring(p))
+ (point(0, 0))
+ (point(0, 2))
+ (point(2, 2))
+ (point(2, 0))
+ (point(0, 0))
+ ;
+
+ std::cout << dsv(p) << std::endl;
+ }
+
+ {
+ // It is convenient to combine Boost.Assign on a geometry (e.g. polygon) with tuples.
+ typedef model::polygon<boost::tuple<double,double> > polygon;
+
+ polygon p;
+ exterior_ring(p) = tuple_list_of(0, 0)(0, 5)(5, 5)(5, 0)(0, 0);
+
+ std::cout << dsv(p) << std::endl;
+
+ // And let it work on the interior_rings as well
+ push_back(interior_rings(p))
+ (tuple_list_of(1, 1)(2, 1)(2, 2)(1, 2)(1, 1))
+ (tuple_list_of(3, 3)(4, 3)(4, 4)(3, 4)(3, 3))
+ ;
+
+ std::cout << "Area of " << dsv(p) << " is " << area(p) << std::endl;
+ }
+
+
+ return 0;
+}