org.jaitools.jts
Class LineSmoother

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

public class LineSmoother
extends AbstractSmoother

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

To use the same algorithm for LineStrings we add a dummy vertex to either end, calculate control points for just the real vertices.

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

LineSmoother()
Default constructor.

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

Method Summary

com.vividsolutions.jts.geom.LineString

smooth(com.vividsolutions.jts.geom.LineString ls, double alpha) Creates a new LineString which is a smoothed version of the input LineString.

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

LineSmoother

public LineSmoother()

Default constructor.

LineSmoother

public LineSmoother(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.LineString smooth(com.vividsolutions.jts.geom.LineString ls,
                                                     double alpha)

Creates a new LineString which is a smoothed version of the input LineString.

Parameters:

ls - the input LineString

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

Returns:

the smoothed LineString