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Diffstat (limited to 'src/boost/libs/geometry/example/ml02_distance_strategy.cpp')
-rw-r--r-- | src/boost/libs/geometry/example/ml02_distance_strategy.cpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/boost/libs/geometry/example/ml02_distance_strategy.cpp b/src/boost/libs/geometry/example/ml02_distance_strategy.cpp new file mode 100644 index 00000000..1e298901 --- /dev/null +++ b/src/boost/libs/geometry/example/ml02_distance_strategy.cpp @@ -0,0 +1,36 @@ +// 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; +} |