Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input. More...

#include <TopologyPreservingSimplifier.h>

Collaboration diagram for geos::simplify::TopologyPreservingSimplifier:

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Public Member Functions
	TopologyPreservingSimplifier (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

std::unique_ptr< TaggedLinesSimplifier >	lineSimplifier

Detailed Description

Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input.

The simplification uses a maximum distance difference algorithm similar to the one used in the Douglas-Peucker algorithm.

In particular, if the input is an areal geometry ( Polygon or MultiPolygon )

The result has the same number of shells and holes (rings) as the input, in the same order
The result rings touch at no more than the number of touching point in the input (although they may touch at fewer points)

Definition at line 57 of file TopologyPreservingSimplifier.h.

Constructor & Destructor Documentation

geos::simplify::TopologyPreservingSimplifier::TopologyPreservingSimplifier ( const geom::Geometry * geom )

Member Function Documentation

std::unique_ptr<geom::Geometry> geos::simplify::TopologyPreservingSimplifier::getResultGeometry ( )

void geos::simplify::TopologyPreservingSimplifier::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