diff options
author | Andrej Shadura <andrewsh@debian.org> | 2019-03-09 22:30:28 +0000 |
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committer | Andrej Shadura <andrewsh@debian.org> | 2019-03-09 22:30:28 +0000 |
commit | cde76aeb42240f7270bc6605c606ae07d2dc5a7d (patch) | |
tree | c3ebf1d7745224f524da31dbabc5d76b9ea75916 /src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java |
Import Upstream version 0.4.0~beta1
Diffstat (limited to 'src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java')
-rw-r--r-- | src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java b/src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java new file mode 100644 index 00000000..0e0b27a0 --- /dev/null +++ b/src/de/lmu/ifi/dbs/elki/distance/distancefunction/geo/LatLngDistanceFunction.java @@ -0,0 +1,88 @@ +package de.lmu.ifi.dbs.elki.distance.distancefunction.geo; +/* +This file is part of ELKI: +Environment for Developing KDD-Applications Supported by Index-Structures + +Copyright (C) 2011 +Ludwig-Maximilians-Universität München +Lehr- und Forschungseinheit für Datenbanksysteme +ELKI Development Team + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU Affero General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU Affero General Public License for more details. + +You should have received a copy of the GNU Affero General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +import de.lmu.ifi.dbs.elki.data.NumberVector; +import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation; +import de.lmu.ifi.dbs.elki.data.type.VectorFieldTypeInformation; +import de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractVectorDoubleDistanceFunction; +import de.lmu.ifi.dbs.elki.math.MathUtil; +import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer; + +/** + * Distance function for 2D vectors in Latitude, Longitude form. + * + * @author Erich Schubert + */ +public class LatLngDistanceFunction extends AbstractVectorDoubleDistanceFunction { + /** + * Static instance + */ + public static final LatLngDistanceFunction STATIC = new LatLngDistanceFunction(); + + /** + * Constructor. Use static instance instead! + */ + @Deprecated + public LatLngDistanceFunction() { + super(); + } + + @Override + public double doubleDistance(NumberVector<?, ?> o1, NumberVector<?, ?> o2) { + return MathUtil.latlngDistance(o1.doubleValue(1), o1.doubleValue(2), o2.doubleValue(1), o2.doubleValue(2)); + } + + @Override + public SimpleTypeInformation<? super NumberVector<?, ?>> getInputTypeRestriction() { + return VectorFieldTypeInformation.get(NumberVector.class, 2); + } + + @Override + public boolean equals(Object obj) { + if(obj == null) { + return false; + } + if(obj == this) { + return true; + } + if(this.getClass().equals(obj.getClass())) { + return true; + } + return super.equals(obj); + } + + /** + * Parameterization class. + * + * @author Erich Schubert + * + * @apiviz.exclude + */ + public static class Parameterizer extends AbstractParameterizer { + @Override + protected LatLngDistanceFunction makeInstance() { + return LatLngDistanceFunction.STATIC; + } + } +}
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