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org.apache.batik.ext.awt.geom
Class PathLength  

java.lang.Object
  org.apache.batik.ext.awt.geom.PathLength

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public class PathLength

extends java.lang.Object

PathLength is a utility class for calculating the length of a path, the location of a point at a particular length along the path, and the angle of the tangent to the path at a given length.

It uses a FlatteningPathIterator to create a flattened version of the Path. This means the values returned are not always exact (in fact, they rarely are), but in most cases they are reasonably accurate.

Version:

$Id: PathLength.java,v 1.8 2005/02/27 02:08:52 deweese Exp $

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Nested Class Summary
protected  class	PathLength.PathSegment

 

Field Summary
private  boolean	initialised           Has this path been flattened?
private  java.awt.Shape	path
private  float	pathLength           Cached copy of the path length.
private  java.util.Vector	segments           The list of flattened path segments.

 

Constructor Summary

PathLength(java.awt.Shape path)           Construct a PathLength utility class to operate on the particular Shape.

 

Method Summary
float	angleAtLength(float length)
int	findUpperIndex(float length)
java.awt.Shape	getPath()           Get the path to use in calculations.
protected  void	initialise()
float	lengthOfPath()           Returns the length of the path used by this PathLength object.
static void	main(java.lang.String[] args)
java.awt.geom.Point2D	pointAtLength(float length)           Return the point that is at the given length along the path.
void	setPath(java.awt.Shape v)           Set the path to use in calculations.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

path

private java.awt.Shape path

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segments

private java.util.Vector segments

The list of flattened path segments.

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pathLength

private float pathLength

Cached copy of the path length.

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initialised

private boolean initialised

Has this path been flattened?

Constructor Detail

PathLength

public PathLength(java.awt.Shape path)

Construct a PathLength utility class to operate on the particular Shape.

Method Detail

getPath

public java.awt.Shape getPath()

Get the path to use in calculations.

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setPath

public void setPath(java.awt.Shape v)

Set the path to use in calculations.

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lengthOfPath

public float lengthOfPath()

Returns the length of the path used by this PathLength object.

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initialise

protected void initialise()

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pointAtLength

public java.awt.geom.Point2D pointAtLength(float length)

Return the point that is at the given length along the path.

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angleAtLength

public float angleAtLength(float length)

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findUpperIndex

public int findUpperIndex(float length)

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main

public static void main(java.lang.String[] args)

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