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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// 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)
+//
+// Multipolygon DP simplification example from the mailing list discussion
+// about the DP algorithm issue:
+// http://lists.osgeo.org/pipermail/ggl/2011-September/001533.html
+
+#include <boost/geometry.hpp>
+#include <boost/geometry/strategies/cartesian/distance_pythagoras.hpp>
+#include <boost/geometry/geometries/point_xy.hpp>
+using namespace boost::geometry;
+
+int main()
+{
+ typedef model::d2::point_xy<double> point_xy;
+
+ point_xy p1(0.0, 0.0);
+ point_xy p2(5.0, 0.0);
+
+ // 1) This is direct call to Pythagoras algo
+ typedef strategy::distance::pythagoras<point_xy, point_xy, double> strategy1_type;
+ strategy1_type strategy1;
+ strategy1_type ::calculation_type d1 = strategy1.apply(p1, p2);
+
+ // 2) This is what is effectively called by simplify
+ typedef strategy::distance::comparable::pythagoras<point_xy, point_xy, double> strategy2_type;
+ strategy2_type strategy2;
+ strategy2_type::calculation_type d2 = strategy2.apply(p1, p2);
+
+ return 0;
+}