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 //[box_view
11 //` Shows usage of the Boost.Range compatible view on a box
12
13 #include <iostream>
14
15 #include <boost/geometry.hpp>
16
17
main()18 int main()
19 {
20 typedef boost::geometry::model::box
21 <
22 boost::geometry::model::point<double, 2, boost::geometry::cs::cartesian>
23 > box_type;
24
25 // Define the Boost.Range compatible type:
26 typedef boost::geometry::box_view<box_type> box_view;
27
28 box_type box;
29 boost::geometry::assign_values(box, 0, 0, 4, 4);
30
31 box_view view(box);
32
33 // Iterating in clockwise direction over the points of this box
34 for (boost::range_iterator<box_view const>::type it = boost::begin(view);
35 it != boost::end(view); ++it)
36 {
37 std::cout << " " << boost::geometry::dsv(*it);
38 }
39 std::cout << std::endl;
40
41 // Note that a box_view is tagged as a ring, so supports area etc.
42 std::cout << "Area: " << boost::geometry::area(view) << std::endl;
43
44 return 0;
45 }
46
47 //]
48
49
50 //[box_view_output
51 /*`
52 Output:
53 [pre
54 (0, 0) (0, 4) (4, 4) (4, 0) (0, 0)
55 Area: 16
56 ]
57 */
58 //]
59