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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 | //[boost_range_strided | |
11 | //` Shows how to use a Boost.Geometry ring, strided by Boost.Range adaptor | |
12 | ||
13 | #include <iostream> | |
14 | ||
15 | #include <boost/assign.hpp> | |
16 | ||
17 | #include <boost/geometry.hpp> | |
18 | #include <boost/geometry/geometries/point_xy.hpp> | |
19 | #include <boost/geometry/geometries/ring.hpp> | |
20 | #include <boost/geometry/geometries/adapted/boost_range/strided.hpp> | |
21 | ||
22 | ||
23 | int main() | |
24 | { | |
25 | using namespace boost::assign; | |
26 | using boost::adaptors::strided; | |
27 | ||
28 | typedef boost::geometry::model::d2::point_xy<int> xy; | |
29 | boost::geometry::model::ring<xy> ring; | |
30 | ring += xy(0, 0); | |
31 | ring += xy(0, 1); | |
32 | ring += xy(0, 2); | |
33 | ring += xy(1, 2); | |
34 | ring += xy(2, 2); | |
35 | ring += xy(2, 0); | |
36 | ||
37 | boost::geometry::correct(ring); | |
38 | ||
39 | std::cout | |
40 | << "Normal : " << boost::geometry::dsv(ring) << std::endl | |
41 | << "Strided: " << boost::geometry::dsv(ring | strided(2)) << std::endl; | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | //] | |
47 | ||
48 | //[boost_range_strided_output | |
49 | /*` | |
50 | Output: | |
51 | [pre | |
52 | Normal : ((0, 0), (0, 1), (0, 2), (1, 2), (2, 2), (2, 0), (0, 0)) | |
53 | Strided: ((0, 0), (0, 2), (2, 2), (0, 0)) | |
54 | ] | |
55 | */ | |
56 | //] |