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Diffstat (limited to 'src/boost/libs/geometry/example/04_boost_example.cpp')
-rw-r--r-- | src/boost/libs/geometry/example/04_boost_example.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/boost/libs/geometry/example/04_boost_example.cpp b/src/boost/libs/geometry/example/04_boost_example.cpp new file mode 100644 index 000000000..1f2c29b14 --- /dev/null +++ b/src/boost/libs/geometry/example/04_boost_example.cpp @@ -0,0 +1,94 @@ +// 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; +} |