C++ (Cpp) join_strategy Examples

Example #1

File: buffer_join_round.cpp Project: Adikteev/rtbkit-deps

int main()
{
    typedef boost::geometry::model::d2::point_xy<double> point;
    typedef boost::geometry::model::polygon<point> polygon;

    // Declare the join_round strategy with 72 points for a full circle
    boost::geometry::strategy::buffer::join_round join_strategy(72);

    // Declare other strategies
    boost::geometry::strategy::buffer::distance_symmetric<double> distance_strategy(1.0);
    boost::geometry::strategy::buffer::end_flat end_strategy;
    boost::geometry::strategy::buffer::side_straight side_strategy;
    boost::geometry::strategy::buffer::point_circle point_strategy;

    // Declare/fill a multi polygon
    boost::geometry::model::multi_polygon<polygon> mp;
    boost::geometry::read_wkt("MULTIPOLYGON(((5 5,7 8,9 5,5 5)),((8 7,8 10,11 10,11 7,8 7)))", mp);

    // Create the buffered geometry with rounded corners
    boost::geometry::model::multi_polygon<polygon> result;
    boost::geometry::buffer(mp, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, point_strategy);
    /*<-*/ create_svg_buffer("buffer_join_round.svg", mp, result); /*->*/

    return 0;
}

Example #2

File: multi_point_growth.cpp Project: Ding8222/abelkhan

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);
    }

Example #3

File: buffer_with_strategies.cpp Project: LancelotGHX/Simula

int main()
{
    typedef double coordinate_type;
    typedef boost::geometry::model::d2::point_xy<coordinate_type> point;
    typedef boost::geometry::model::polygon<point> polygon;

    // Declare strategies
    const double buffer_distance = 1.0;
    const int points_per_circle = 36;
    boost::geometry::strategy::buffer::distance_symmetric<coordinate_type> distance_strategy(buffer_distance);
    boost::geometry::strategy::buffer::join_round join_strategy(points_per_circle);
    boost::geometry::strategy::buffer::end_round end_strategy(points_per_circle);
    boost::geometry::strategy::buffer::point_circle circle_strategy(points_per_circle);
    boost::geometry::strategy::buffer::side_straight side_strategy;

    // Declare output
    boost::geometry::model::multi_polygon<polygon> result;

    // Declare/fill a linestring
    boost::geometry::model::linestring<point> ls;
    boost::geometry::read_wkt("LINESTRING(0 0,4 5,7 4,10 6)", ls);

    // Create the buffer of a linestring
    boost::geometry::buffer(ls, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, circle_strategy);
    /*<-*/ create_svg_buffer("buffer_linestring.svg", ls, result); /*->*/

    // Declare/fill a multi point
    boost::geometry::model::multi_point<point> mp;
    boost::geometry::read_wkt("MULTIPOINT((3 3),(4 4),(6 2))", mp);

    // Create the buffer of a multi point
    boost::geometry::buffer(mp, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, circle_strategy);
    /*<-*/ create_svg_buffer("buffer_multi_point.svg", mp, result); /*->*/

    // Declare/fill a multi_polygon
    boost::geometry::model::multi_polygon<polygon> mpol;
    boost::geometry::read_wkt("MULTIPOLYGON(((0 1,2 5,5 3,0 1)),((1 1,5 2,5 0,1 1)))", mpol);

    // Create the buffer of a multi polygon
    boost::geometry::buffer(mpol, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, circle_strategy);
    /*<-*/ create_svg_buffer("buffer_multi_polygon.svg", mpol, result); /*->*/

    return 0;
}