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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// QuickBook Example
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// Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//[assign_points
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//` Shows usage of Boost.Geometry's assign, Boost.Assign, and Boost.Range to assign ranges of a linestring
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#include <iostream>
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#include <boost/geometry.hpp>
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#include <boost/geometry/geometries/linestring.hpp>
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#include <boost/geometry/geometries/adapted/boost_tuple.hpp>
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#include <boost/assign.hpp>
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#include <boost/geometry/geometries/adapted/boost_range/filtered.hpp>
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BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
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template <typename T>
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struct x_between
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{
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x_between(T a, T b)
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: fa(a), fb(b)
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{}
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template <typename P>
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bool operator()(P const& p) const
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{
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return boost::geometry::get<0>(p) >= fa
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&& boost::geometry::get<0>(p) <= fb;
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}
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private :
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T fa, fb;
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};
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int main()
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{
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using namespace boost::assign;
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typedef boost::geometry::model::linestring<boost::tuple<int, int> > ls;
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ls line1, line2, line3;
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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 >*/
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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 >*/
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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 >*/
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std::cout << "line 1: " << boost::geometry::dsv(line1) << std::endl;
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std::cout << "line 2: " << boost::geometry::dsv(line2) << std::endl;
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std::cout << "line 3: " << boost::geometry::dsv(line3) << std::endl;
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return 0;
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}
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//]
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//[assign_points_output
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/*`
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Output:
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[pre
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line 1: ((0, 0), (2, 3), (4, 0), (6, 3), (8, 0), (10, 3), (12, 0))
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line 2: ((0, 0), (2, 2), (4, 0), (6, 2), (8, 0))
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line 3: ((4, 0), (6, 3), (8, 0))
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]
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*/
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//]
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