geos::simplify::TopologyPreservingSimplifier Class Reference

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>

Public Member Functions
	TopologyPreservingSimplifier (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, 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)

Member Function Documentation

setDistanceTolerance()

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

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

• TopologyPreservingSimplifier.h