libs/geometry/doc/src/examples/algorithms/length.cpp

   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 //[length
  11     //` The following simple example shows the calculation of the length of a linestring containing three points
  12
  13 #include <iostream>
  14 #include <boost/geometry.hpp>
  15 #include <boost/geometry/geometries/linestring.hpp>
  16 #include <boost/geometry/geometries/point_xy.hpp>
  17
  18
  19 int main()
  20 {
  21     using namespace boost::geometry;
  22     model::linestring<model::d2::point_xy<double> > line;
  23     read_wkt("linestring(0 0,1 1,4 8,3 2)", line);
  24     std::cout << "linestring length is "
  25         << length(line)
  26         << " units" << std::endl;
  27
  28     return 0;
  29 }
  30
  31 //]
  32
  33
  34 //[length_output
  35 /*`
  36 Output:
  37 [pre
  38 linestring length is 15.1127 units
  39 ]
  40 */
  41 //]