geos::simplify::DouglasPeuckerSimplifier Class Reference

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

#include <DouglasPeuckerSimplifier.h>

Collaboration diagram for geos::simplify::DouglasPeuckerSimplifier:

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

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

Private Attributes
const geom::Geometry *	inputGeom
double	distanceTolerance

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).

Definition at line 50 of file DouglasPeuckerSimplifier.h.

Constructor & Destructor Documentation

geos::simplify::DouglasPeuckerSimplifier::DouglasPeuckerSimplifier

(

const geom::Geometry *

geom

)

Member Function Documentation

std::unique_ptr<geom::Geometry> geos::simplify::DouglasPeuckerSimplifier::getResultGeometry

(

)

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

static std::unique_ptr<geom::Geometry> geos::simplify::DouglasPeuckerSimplifier::simplify ( const geom::Geometry *  geom, double  tolerance  )

static

Member Data Documentation

double geos::simplify::DouglasPeuckerSimplifier::distanceTolerance

private

Definition at line 79 of file DouglasPeuckerSimplifier.h.

const geom::Geometry* geos::simplify::DouglasPeuckerSimplifier::inputGeom

private

Definition at line 77 of file DouglasPeuckerSimplifier.h.

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

• DouglasPeuckerSimplifier.h