| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| // QuickBook Example |
| |
| // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. |
| |
| // Use, modification and distribution is subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| //[num_interior_rings |
| //` Get the number of interior rings in a multi-polygon |
| |
| #include <iostream> |
| |
| #include <boost/geometry.hpp> |
| #include <boost/geometry/geometries/point_xy.hpp> |
| #include <boost/geometry/geometries/polygon.hpp> |
| #include <boost/geometry/geometries/multi_polygon.hpp> |
| |
| |
| int main() |
| { |
| boost::geometry::model::multi_polygon |
| < |
| boost::geometry::model::polygon |
| < |
| boost::geometry::model::d2::point_xy<double> |
| > |
| > mp; |
| boost::geometry::read_wkt("MULTIPOLYGON(((0 0,0 10,10 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 10)))", mp); |
| std::cout << "Number of interior rings: " << boost::geometry::num_interior_rings(mp) << std::endl; |
| |
| return 0; |
| } |
| |
| //] |
| |
| |
| //[num_interior_rings_output |
| /*` |
| Output: |
| [pre |
| Number of interior rings: 1 |
| ] |
| */ |
| //] |
