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 main()19int 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 //] 42