hep.wired.heprep.util

Class NearestPointPathConstructor

java.lang.Object

org.freehep.graphicsio.AbstractPathConstructor

org.freehep.graphicsio.QuadToCubicPathConstructor

hep.wired.heprep.util.NearestPointPathConstructor

All Implemented Interfaces:

org.freehep.graphicsio.PathConstructor

public class NearestPointPathConstructor
extends org.freehep.graphicsio.QuadToCubicPathConstructor

Constructs a path while keeping track of the nearest point on that path to an arbitrary given point.

Version:

$Id: NearestPointPathConstructor.java 8598 2006-08-14 20:38:02Z duns $

Author:

Mark Donszelmann

Field Summary

Fields inherited from class org.freehep.graphicsio.AbstractPathConstructor

currentX, currentY

Constructor Summary

Constructors

Constructor and Description
NearestPointPathConstructor(Point2D arbitraryPoint) Creates a path constructor with given arbitrary point

Method Summary

Methods

Modifier and Type	Method and Description
void	closePath(double x0, double y0) Closes the current path, called from addPath.
void	cubic(double x1, double y1, double x2, double y2, double x3, double y3) Adds a cubic bezier to the path, called from addPath.
double	distanceSq() Returns squared distance from the arbitrary point to the nearest point on path.
Point2D	getNearestPoint() Returns nearest point on path, nearest to the given arbitrary point, or null if path is empty.
void	line(double x, double y) Adds a line to the path, called from addPath.
protected void	pointFound(Point2D nearestPoint, double distanceSq, boolean closer) Called when a closer or equal point is found, so that the subclass can use this to track some other information, such as keeping a reference to the closest object(s).

Methods inherited from class org.freehep.graphicsio.QuadToCubicPathConstructor

move, quad

Methods inherited from class org.freehep.graphicsio.AbstractPathConstructor

addPath, addPath, addPath, flush, isEvenOdd

Methods inherited from class java.lang.Object

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

Constructor Detail

NearestPointPathConstructor

public NearestPointPathConstructor(Point2D arbitraryPoint)

Creates a path constructor with given arbitrary point

Method Detail

line

public void line(double x,
        double y)
          throws IOException

Adds a line to the path, called from addPath.

Specified by:

line in interface org.freehep.graphicsio.PathConstructor

Overrides:

line in class org.freehep.graphicsio.QuadToCubicPathConstructor

Throws:

IOException

cubic

public void cubic(double x1,
         double y1,
         double x2,
         double y2,
         double x3,
         double y3)
           throws IOException

Adds a cubic bezier to the path, called from addPath.

Specified by:

cubic in interface org.freehep.graphicsio.PathConstructor

Overrides:

cubic in class org.freehep.graphicsio.QuadToCubicPathConstructor

Throws:

IOException

closePath

public void closePath(double x0,
             double y0)
               throws IOException

Closes the current path, called from addPath.

Specified by:

closePath in interface org.freehep.graphicsio.PathConstructor

Overrides:

closePath in class org.freehep.graphicsio.QuadToCubicPathConstructor

Throws:

IOException

getNearestPoint

public Point2D getNearestPoint()

Returns nearest point on path, nearest to the given arbitrary point, or null if path is empty.

distanceSq

public double distanceSq()

Returns squared distance from the arbitrary point to the nearest point on path. If path is empty, -1 is returned.

pointFound

protected void pointFound(Point2D nearestPoint,
              double distanceSq,
              boolean closer)

Called when a closer or equal point is found, so that the subclass can use this to track some other information, such as keeping a reference to the closest object(s).