/Src/Dependencies/Boost/libs/geometry/doc/src/examples/views/segment_view.cpp

 1// Boost.Geometry (aka GGL, Generic Geometry Library)
 2// QuickBook Example
 3
 4// Copyright (c) 2011 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//[segment_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
18int main()
19{
20    typedef boost::geometry::model::segment
21        <
22            boost::geometry::model::point<double, 2, boost::geometry::cs::cartesian>
23        > segment_type;
24        
25    typedef boost::geometry::segment_view<segment_type> segment_view;        
26        
27    segment_type segment;
28    boost::geometry::assign_values(segment, 0, 0, 1, 1);
29    
30    segment_view view(segment);
31    
32    // Iterating over the points of this segment
33    for (boost::range_iterator<segment_view const>::type it = boost::begin(view);
34        it != boost::end(view); ++it)
35    {
36        std::cout << " " << boost::geometry::dsv(*it);
37    }
38    std::cout << std::endl;
39    
40    // Note that a segment_view is tagged as a linestring, so supports length etc.
41    std::cout << "Length: " << boost::geometry::length(view) << std::endl;
42    
43    return 0;
44}
45
46//]
47
48
49//[segment_view_output
50/*`
51Output:
52[pre
53 (0, 0) (0, 4) (4, 4) (4, 0) (0, 0)
54Area: 16
55]
56*/
57//]