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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 | //[point_order | |
11 | //` Examine the expected point order of a polygon type | |
12 | ||
13 | #include <iostream> | |
14 | ||
15 | #include <boost/geometry.hpp> | |
16 | #include <boost/geometry/geometries/polygon.hpp> | |
17 | #include <boost/geometry/geometries/point_xy.hpp> | |
18 | ||
19 | int main() | |
20 | { | |
21 | typedef boost::geometry::model::d2::point_xy<double> point_type; | |
22 | typedef boost::geometry::model::polygon<point_type, false> polygon_type; | |
23 | ||
24 | boost::geometry::order_selector order = boost::geometry::point_order<polygon_type>::value; | |
25 | ||
26 | std::cout << "order: " << order << std::endl | |
27 | << "(clockwise = " << boost::geometry::clockwise | |
28 | << ", counterclockwise = " << boost::geometry::counterclockwise | |
29 | << ") "<< std::endl; | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | //] | |
35 | ||
36 | ||
37 | //[point_order_output | |
38 | /*` | |
39 | Output: | |
40 | [pre | |
41 | order: 2 | |
42 | (clockwise = 1, counterclockwise = 2) | |
43 | ] | |
44 | */ | |
45 | //] |