1 files changed, 139 insertions, 0 deletions
diff --git a/libs/geometry/test/robustness/overlay/buffer/multi_point_growth.cpp b/libs/geometry/test/robustness/overlay/buffer/multi_point_growth.cpp
new file mode 100644
index 000000000..d74a6c5f6
--- /dev/null
+++ b/libs/geometry/test/robustness/overlay/buffer/multi_point_growth.cpp
@@ -0,0 +1,139 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+// Performance Test
+
+// Copyright (c) 2012-2015 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)
+
+#include <boost/geometry.hpp>
+#include <boost/geometry/multi/geometries/multi_geometries.hpp>
+
+#include <boost/foreach.hpp>
+#include <boost/timer.hpp>
+#include <fstream>
+
+
+namespace bg = boost::geometry;
+
+template
+<
+    typename GeometryOut,
+    typename Geometry
+>
+double test_growth(Geometry const& geometry, int n, int d, double distance)
+{
+
+    typedef typename bg::coordinate_type<Geometry>::type coordinate_type;
+    typedef typename bg::point_type<Geometry>::type point_type;
+
+    // extern int point_buffer_count;
+    std::ostringstream complete;
+    complete
+        << "point_growth"
+        << "_" << "r"
+        << "_" << n
+        << "_" << d
+         // << "_" << point_buffer_count
+        ;
+
+    //std::cout << complete.str() << std::endl;
+
+    std::ostringstream filename;
+    filename << "buffer_" << complete.str() << ".svg";
+
+    std::ofstream svg(filename.str().c_str());
+
+#ifdef BOOST_GEOMETRY_DEBUG_WITH_MAPPER
+    bg::svg_mapper<point_type> mapper(svg, 500, 500);
+
+    {
+        bg::model::box<point_type> box;
+        bg::envelope(geometry, box);
+
+        bg::buffer(box, box, distance * 1.01);
+        mapper.add(box);
+    }
+#endif
+
+    bg::strategy::buffer::join_round join_strategy(100);
+    bg::strategy::buffer::end_flat end_strategy;
+    bg::strategy::buffer::point_circle point_strategy;
+    bg::strategy::buffer::side_straight side_strategy;
+
+    typedef bg::strategy::buffer::distance_symmetric<coordinate_type> distance_strategy_type;
+    distance_strategy_type distance_strategy(distance);
+
+    std::vector<GeometryOut> buffered;
+
+    bg::buffer(geometry, buffered,
+                distance_strategy, side_strategy,
+                join_strategy, end_strategy, point_strategy);
+
+
+    typename bg::default_area_result<GeometryOut>::type area = 0;
+    BOOST_FOREACH(GeometryOut const& polygon, buffered)
+    {
+        area += bg::area(polygon);
+    }
+
+#ifdef BOOST_GEOMETRY_DEBUG_WITH_MAPPER
+    // Map input geometry in green
+    mapper.map(geometry, "opacity:0.5;fill:rgb(0,128,0);stroke:rgb(0,128,0);stroke-width:10");
+
+    BOOST_FOREACH(GeometryOut const& polygon, buffered)
+    {
+        mapper.map(polygon, "opacity:0.4;fill:rgb(255,255,128);stroke:rgb(0,0,0);stroke-width:3");
+    }
+#endif
+
+    return area;
+}
+
+template <typename P>
+void test_growth(int n, int distance_count)
+{
+    srand(int(time(NULL)));
+    //std::cout << typeid(bg::coordinate_type<P>::type).name() << std::endl;
+    boost::timer t;
+
+    namespace buf = bg::strategy::buffer;
+    typedef bg::model::polygon<P> polygon;
+    typedef bg::model::multi_point<P> multi_point_type;
+
+    multi_point_type multi_point;
+    for (int i = 0; i < n; i++)
+    {
+        P point(rand() % 100, rand() % 100);
+        multi_point.push_back(point);
+    }
+
+    //std::cout << bg::wkt(multi_point) << std::endl;
+
+    double previous_area = 0;
+    double epsilon = 0.1;
+    double distance = 15.0;
+    for (int d = 0; d < distance_count; d++, distance += epsilon)
+    {
+        double area = test_growth<polygon>(multi_point, n, d, distance);
+        if (area < previous_area)
+        {
+            std::cout << "Error: " << area << " < " << previous_area << std::endl
+                << " n=" << n << " distance=" << distance
+                << bg::wkt(multi_point) << std::endl;
+        }
+        previous_area = area;
+    }
+    std::cout << "n=" << n << " time=" << t.elapsed() << std::endl;
+}
+
+int main(int, char* [])
+{
+    for (int i = 5; i <= 50; i++)
+    {
+        test_growth<bg::model::point<double, 2, bg::cs::cartesian> >(i, 20);
+    }
+
+    return 0;
+}