/Src/Dependencies/Boost/libs/geometry/doc/src/examples/algorithms/assign_points.cpp
http://hadesmem.googlecode.com/ · C++ · 73 lines · 35 code · 19 blank · 19 comment · 1 complexity · 3e25a6ec5b480f9829fd7d28c38ed3e7 MD5 · raw file
- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // QuickBook Example
- // Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands.
- // 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)
- //[assign_points
- //` Shows usage of Boost.Geometry's assign, Boost.Assign, and Boost.Range to assign ranges of a linestring
- #include <iostream>
- #include <boost/geometry.hpp>
- #include <boost/geometry/geometries/linestring.hpp>
- #include <boost/geometry/geometries/adapted/boost_tuple.hpp>
- #include <boost/assign.hpp>
- #include <boost/geometry/geometries/adapted/boost_range/filtered.hpp>
- BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
- template <typename T>
- struct x_between
- {
- x_between(T a, T b)
- : fa(a), fb(b)
- {}
- template <typename P>
- bool operator()(P const& p) const
- {
- return boost::geometry::get<0>(p) >= fa
- && boost::geometry::get<0>(p) <= fb;
- }
- private :
- T fa, fb;
- };
- int main()
- {
- using namespace boost::assign;
- typedef boost::geometry::model::linestring<boost::tuple<int, int> > ls;
- ls line1, line2, line3;
- line1 = tuple_list_of(0, 0)(2, 3)(4, 0)(6, 3)(8, 0)(10, 3)(12, 0); /*< tuple_list_of is part of Boost.Assign and can be used for Boost.Geometry if points are tuples >*/
- boost::geometry::assign_points(line2, tuple_list_of(0, 0)(2, 2)(4, 0)(6, 2)(8, 0)); /*< tuple_list_of delivers a range and can therefore be used in boost::geometry::assign >*/
- boost::geometry::assign_points(line3, line1 | boost::adaptors::filtered(x_between<int>(4, 8))); /*< Boost.Range adaptors can also be used in boost::geometry::assign >*/
- std::cout << "line 1: " << boost::geometry::dsv(line1) << std::endl;
- std::cout << "line 2: " << boost::geometry::dsv(line2) << std::endl;
- std::cout << "line 3: " << boost::geometry::dsv(line3) << std::endl;
- return 0;
- }
- //]
- //[assign_points_output
- /*`
- Output:
- [pre
- line 1: ((0, 0), (2, 3), (4, 0), (6, 3), (8, 0), (10, 3), (12, 0))
- line 2: ((0, 0), (2, 2), (4, 0), (6, 2), (8, 0))
- line 3: ((4, 0), (6, 3), (8, 0))
- ]
- */
- //]