org.jaitools.jts
Class PolygonSmoother

java.lang.Object
  org.jaitools.jts.AbstractSmoother
      org.jaitools.jts.PolygonSmoother

public class PolygonSmoother
extends AbstractSmoother

Polygon smoothing by interpolation with cubic Bazier curves. This code implements an algorithm which was devised by Maxim Shemanarev and described by him at: http://www.antigrain.com/research/bezier_interpolation/index.html.

Note: the code here is not that written by Maxim to accompany his algorithm description. Rather, it is an original implementation and any errors are my fault.

Since:

1.1

Version:

$Id$

Author:

Michael Bedward

Nested Class Summary

Nested classes/interfaces inherited from class org.jaitools.jts.AbstractSmoother

AbstractSmoother.InterpPoint

Field Summary

Fields inherited from class org.jaitools.jts.AbstractSmoother

control, DEFAULT_CONTROL, geomFactory, lookup

Constructor Summary

PolygonSmoother()
Default constructor.

PolygonSmoother(com.vividsolutions.jts.geom.GeometryFactory geomFactory)
Constructor.

Method Summary

com.vividsolutions.jts.geom.Polygon

smooth(com.vividsolutions.jts.geom.Polygon inputPoly, double alpha) Creates a new Polygon whose exterior shell is a smoothed version of the input Polygon.

Methods inherited from class org.jaitools.jts.AbstractSmoother

cubicBezier, getInterpPoints, setControl

Methods inherited from class java.lang.Object

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

Constructor Detail

PolygonSmoother

public PolygonSmoother()

Default constructor.

PolygonSmoother

public PolygonSmoother(com.vividsolutions.jts.geom.GeometryFactory geomFactory)

Constructor.

Parameters:

geomFactory - an instance of GeometryFactory to use when creating smoothed Geometry objects

Throws:

IllegalArgumentException - if geomFactory is null

Method Detail

smooth

public com.vividsolutions.jts.geom.Polygon smooth(com.vividsolutions.jts.geom.Polygon inputPoly,
                                                  double alpha)

Creates a new Polygon whose exterior shell is a smoothed version of the input Polygon.

Note: this method presently ignores holes.

Parameters:

inputPoly - the input Polygon

alpha - a value between 0 and 1 (inclusive) specifying the tightness of fit of the smoothed boundary (0 is loose)

Returns:

the smoothed Polygon