com.vividsolutions.jts.algorithm
Class RobustDeterminant

java.lang.Object
  com.vividsolutions.jts.algorithm.RobustDeterminant

public class RobustDeterminant
extends java.lang.Object

Implements an algorithm to compute the sign of a 2x2 determinant for double precision values robustly. It is a direct translation of code developed by Olivier Devillers.

The original code carries the following copyright notice:

 Author : Olivier Devillers
 [email protected]
 http:/www.inria.fr:/prisme/personnel/devillers/anglais/determinant.html



              Copyright (c) 1995  by  INRIA Prisme Project
                  BP 93 06902 Sophia Antipolis Cedex, France.
                           All rights reserved

 

Version:

1.7

Constructor Summary

RobustDeterminant()

Method Summary

static int

signOfDet2x2(double x1, double y1, double x2, double y2) Computes the sign of the determinant of the 2x2 matrix with the given entries, in a robust way.

Methods inherited from class java.lang.Object

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

Constructor Detail

RobustDeterminant

public RobustDeterminant()

Method Detail

signOfDet2x2

public static int signOfDet2x2(double x1,
                               double y1,
                               double x2,
                               double y2)

Computes the sign of the determinant of the 2x2 matrix with the given entries, in a robust way.

Returns:

-1 if the determinant is negative,