Mercurial > dive4elements > river
diff backend/src/main/java/org/dive4elements/river/utils/EpsilonComparator.java @ 7730:e1b831fe435a slt-simplify-cross-sections
Merged default into slt-simplify-cross-sections branch and updated package and class names.
author | Tom Gottfried <tom@intevation.de> |
---|---|
date | Mon, 20 Jan 2014 14:04:20 +0100 |
parents | 164e2f2c9bea |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/backend/src/main/java/org/dive4elements/river/utils/EpsilonComparator.java Mon Jan 20 14:04:20 2014 +0100 @@ -0,0 +1,36 @@ +/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde + * Software engineering by Intevation GmbH + * + * This file is Free Software under the GNU AGPL (>=v3) + * and comes with ABSOLUTELY NO WARRANTY! Check out the + * documentation coming with Dive4Elements River for details. + */ + +package org.dive4elements.river.utils; + +import java.util.Comparator; +import java.io.Serializable; + +/** Comparator with some tolerance (epsilon). */ +public class EpsilonComparator implements Comparator<Double>, Serializable +{ + public static final double EPSILON = 1e-4; + + /** Ready-made comparator with 1e-4 tolerance. */ + public static final EpsilonComparator CMP = new EpsilonComparator(EPSILON); + + private double epsilon; + + public EpsilonComparator(double epsilon) { + this.epsilon = epsilon; + } + + @Override + public int compare(Double a, Double b) { + double diff = a - b; + if (diff < -epsilon) return -1; + if (diff > epsilon) return +1; + return 0; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :