Boost C++ Libraries

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strategy::buffer::distance_asymmetric

Let the buffer for linestrings be asymmetric.

Synopsis

template<typename NumericType>
class strategy::buffer::distance_asymmetric
{
  // ...
};

Template parameter(s)

Parameter

Description

typename NumericType

numerical type (int, double, ttmath, ...)

Constructor(s)

Function

Description

Parameters

distance_asymmetric(NumericType const & left, NumericType const & right)

Constructs the strategy, two distances must be specified.

NumericType const &: left: The distance (or radius) of the buffer on the left side

NumericType const &: right: The distance on the right side

Header

#include <boost/geometry/strategies/agnostic/buffer_distance_asymmetric.hpp>

Example

Shows how the distance_asymmetric strategy can be used as a DistanceStrategy to create asymmetric buffers

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/geometries.hpp>


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

    // Declare the asymmetric distance strategy
    boost::geometry::strategy::buffer::distance_asymmetric<double> distance_strategy(1.0, 0.5);

    // Declare other strategies
    boost::geometry::strategy::buffer::side_straight side_strategy;
    boost::geometry::strategy::buffer::join_round join_strategy;
    boost::geometry::strategy::buffer::end_round end_strategy;
    boost::geometry::strategy::buffer::point_circle point_strategy;

    // Declare/fill a multi linestring
    boost::geometry::model::multi_linestring<linestring> ml;
    boost::geometry::read_wkt("MULTILINESTRING((3 5,5 10,7 5),(7 7,11 10,15 7,19 10))", ml);

    // Create the buffered geometry with left/right a different distance
    boost::geometry::model::multi_polygon<polygon> result;
    boost::geometry::buffer(ml, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, point_strategy);


    return 0;
}

Output

buffer_distance_asymmetric

See also

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