geos::simplify::DouglasPeuckerSimplifier Class Reference

Simplifies a Geometry using the standard Douglas-Peucker algorithm. More...

#include <DouglasPeuckerSimplifier.h>

Public Member Functions
	DouglasPeuckerSimplifier (const geom::Geometry *geom)
void	setDistanceTolerance (double tolerance)
	Sets the distance tolerance for the simplification.
std::unique_ptr< geom::Geometry >	getResultGeometry ()

Static Public Member Functions
static std::unique_ptr< geom::Geometry >	simplify (const geom::Geometry *geom, double tolerance)

Detailed Description

Simplifies a Geometry using the standard Douglas-Peucker algorithm.

Ensures that any polygonal geometries returned are valid. Simple lines are not guaranteed to remain simple after simplification.

Note that in general D-P does not preserve topology - e.g. polygons can be split, collapse to lines or disappear holes can be created or disappear, and lines can cross. To simplify geometry while preserving topology use TopologyPreservingSimplifier. (However, using D-P is significantly faster).

Member Function Documentation

setDistanceTolerance()

void geos::simplify::DouglasPeuckerSimplifier::setDistanceTolerance

(

double

tolerance

)

Sets the distance tolerance for the simplification.

All vertices in the simplified geometry will be within this distance of the original geometry. The tolerance value must be non-negative. A tolerance value of zero is effectively a no-op.

Parameters

tolerance

the approximation tolerance to use

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The documentation for this class was generated from the following file:

• DouglasPeuckerSimplifier.h