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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | // QuickBook Example | |
3 | ||
4 | // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
5 | ||
6 | // Use, modification and distribution is subject to the Boost Software License, | |
7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt) | |
9 | ||
10 | //[assign_points | |
11 | //` Shows usage of Boost.Geometry's assign, Boost.Assign, and Boost.Range to assign ranges of a linestring | |
12 | ||
13 | #include <iostream> | |
14 | ||
15 | #include <boost/geometry.hpp> | |
16 | #include <boost/geometry/geometries/linestring.hpp> | |
17 | #include <boost/geometry/geometries/adapted/boost_tuple.hpp> | |
18 | ||
19 | #include <boost/assign.hpp> | |
20 | #include <boost/geometry/geometries/adapted/boost_range/filtered.hpp> | |
21 | ||
22 | BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian) | |
23 | ||
24 | template <typename T> | |
25 | struct x_between | |
26 | { | |
27 | x_between(T a, T b) | |
28 | : fa(a), fb(b) | |
29 | {} | |
30 | ||
31 | template <typename P> | |
32 | bool operator()(P const& p) const | |
33 | { | |
34 | return boost::geometry::get<0>(p) >= fa | |
35 | && boost::geometry::get<0>(p) <= fb; | |
36 | } | |
37 | private : | |
38 | T fa, fb; | |
39 | }; | |
40 | ||
41 | ||
42 | int main() | |
43 | { | |
44 | using namespace boost::assign; | |
45 | ||
46 | typedef boost::geometry::model::linestring<boost::tuple<int, int> > ls; | |
47 | ||
48 | ls line1, line2, line3; | |
49 | ||
50 | 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 >*/ | |
51 | 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 >*/ | |
52 | 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 >*/ | |
53 | ||
54 | std::cout << "line 1: " << boost::geometry::dsv(line1) << std::endl; | |
55 | std::cout << "line 2: " << boost::geometry::dsv(line2) << std::endl; | |
56 | std::cout << "line 3: " << boost::geometry::dsv(line3) << std::endl; | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | //] | |
62 | ||
63 | ||
64 | //[assign_points_output | |
65 | /*` | |
66 | Output: | |
67 | [pre | |
68 | line 1: ((0, 0), (2, 3), (4, 0), (6, 3), (8, 0), (10, 3), (12, 0)) | |
69 | line 2: ((0, 0), (2, 2), (4, 0), (6, 2), (8, 0)) | |
70 | line 3: ((4, 0), (6, 3), (8, 0)) | |
71 | ] | |
72 | */ | |
73 | //] |