com.bbn.openmap.omGraphics.awt
Class LineUtil

java.lang.Object
  com.bbn.openmap.omGraphics.awt.LineUtil

public class LineUtil
extends java.lang.Object

Various computations about plane geometry.

Version:

11 aot 2002

Author:

Eric LEPICIER from Pascal HAURIE 1997

Constructor Summary

LineUtil()

Method Summary

static java.awt.geom.Point2D	interpolatedPoint(java.awt.geom.Point2D A, java.awt.geom.Point2D B, double d) Interpolates a point on a segment.
static double	norm(java.awt.geom.Point2D A, java.awt.geom.Point2D B) Computes the segment length
static double	norm2(java.awt.geom.Point2D A, java.awt.geom.Point2D B) Computes the segment square length
protected static boolean	retrievePoints(float length, java.util.LinkedList<java.awt.geom.Point2D> points, java.util.LinkedList<java.awt.geom.Point2D> polysegment) Extract a length on a polyline.

Methods inherited from class java.lang.Object

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

Constructor Detail

LineUtil

public LineUtil()

Method Detail

norm2

public static double norm2(java.awt.geom.Point2D A,
                           java.awt.geom.Point2D B)

Computes the segment square length

Parameters:

A - the begin point

B - the end point

Returns:

double the square distance between A and B

norm

public static double norm(java.awt.geom.Point2D A,
                          java.awt.geom.Point2D B)

Computes the segment length

Parameters:

A - the begin point

B - the end point

Returns:

double the distance between A and B

interpolatedPoint

public static java.awt.geom.Point2D interpolatedPoint(java.awt.geom.Point2D A,
                                                      java.awt.geom.Point2D B,
                                                      double d)

Interpolates a point on a segment.

Parameters:

A - the begin point

B - the end point

d - the distance from A to the wanted point

Returns:

Point2D the point at distance d from A on the segment AB, the point B if d>AB

retrievePoints

protected static boolean retrievePoints(float length,
                                        java.util.LinkedList<java.awt.geom.Point2D> points,
                                        java.util.LinkedList<java.awt.geom.Point2D> polysegment)

Extract a length on a polyline.

Parameters:

length - the curve length to extract from points

points - the original points

polysegment - the returned points

Returns:

true if we got the desired length, false otherwise