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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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