fr.ign.cogit.cartagen.genealgorithms.polygon

Class VisvalingamWhyatt

Object

VisvalingamWhyatt

public class VisvalingamWhyatt
extends Object

Implementation of the Visvilingam-Whyatt (1993) algorithm for line simplification by vertex filtering. It is more adapted to natural line than the Douglas&Peucker algorithm.

Author:

GTouya

Constructor Summary

Constructors

Constructor and Description
VisvalingamWhyatt(double areaTolerance)

Method Summary

Modifier and Type	Method and Description
double	fastArea(IGeometry triangle) Deprecated.
static void	main(String[] args)
IFeatureCollection<IFeature>	simplify(IFeatureCollection<IFeature> lignes) Visvalingam-Whyatt simplification of a collection of line string.
IFeatureCollection<IFeature>	simplify(IFeatureCollection<IFeature> lignes, Set<Integer> linestoSimplify, SpatialIndex<IFeature> idx) Visvalingam-Whyatt simplification of a subset of an indexed collection of linestrings.
IFeatureCollection<IFeature>	simplify(IFeatureCollection<IFeature> lignes, SpatialIndex<IFeature> idx) Visvalingam-Whyatt simplification of an indexed collection of linestrings.
ILineString	simplify(ILineString line) Visvalingam-Whyatt simplification of a line string.
IPolygon	simplify(IPolygon polygon) Visvalingam-Whyatt simplification of a polygon.
IFeatureCollection<IFeature>	simplifyDebugVersion(IFeatureCollection<IFeature> lignes) Visvalingam-Whyatt simplification of a collection of line string.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VisvalingamWhyatt

public VisvalingamWhyatt(double areaTolerance)

Method Detail

simplify

public ILineString simplify(ILineString line)

Visvalingam-Whyatt simplification of a line string.

Parameters:

line -

Returns:

simplifyDebugVersion

public IFeatureCollection<IFeature> simplifyDebugVersion(IFeatureCollection<IFeature> lignes)

Visvalingam-Whyatt simplification of a collection of line string.

Parameters:

IFeatureCollection - lignes

Returns:

IFeatureCollection lignes

simplify

public IFeatureCollection<IFeature> simplify(IFeatureCollection<IFeature> lignes)

Visvalingam-Whyatt simplification of a collection of line string.

Parameters:

IFeatureCollection - lignes

Returns:

IFeatureCollection lignes

simplify

public IFeatureCollection<IFeature> simplify(IFeatureCollection<IFeature> lignes,
                                             SpatialIndex<IFeature> idx)

Visvalingam-Whyatt simplification of an indexed collection of linestrings. Using a spatial index, speed improvement can be massive

Parameters:

IFeatureCollection - lignes

SpatialIndex - idx

Returns:

IFeatureCollection lignes

simplify

public IFeatureCollection<IFeature> simplify(IFeatureCollection<IFeature> lignes,
                                             Set<Integer> linestoSimplify,
                                             SpatialIndex<IFeature> idx)

Visvalingam-Whyatt simplification of a subset of an indexed collection of linestrings. Using a spatial index, speed improvement can be massive

Parameters:

IFeatureCollection - lignes

Set - linestoSimplify lignes's features ids to simplify

SpatialIndex - idx

Returns:

IFeatureCollection lignes

simplify

public IPolygon simplify(IPolygon polygon)

Visvalingam-Whyatt simplification of a polygon.

Parameters:

line -

Returns:

fastArea

@Deprecated
public double fastArea(IGeometry triangle)

Deprecated.

main

public static void main(String[] args)