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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onlab.util;
import com.google.common.base.MoreObjects;
/**
* Geo location specified in terms of longitude and latitude.
*/
public class GeoLocation {
public static final double EARTH_RADIUS_KM = 6378.1370D;
private final double latitude;
private final double longitude;
/**
* Creates a new location using the specified coordinates.
*
* @param latitude latitude line
* @param longitude longitude line
*/
public GeoLocation(double latitude, double longitude) {
this.latitude = latitude;
this.longitude = longitude;
}
/**
* Returns the latitude of this location.
*
* @return latitude
*/
public double latitude() {
return latitude;
}
/**
* Returns the longitude of this location.
*
* @return longitude
*/
public double longitude() {
return longitude;
}
/**
* Returns the distance in kilometers, between this location and another.
*
* @param other other geo location
* @return distance in kilometers
*/
public double kilometersTo(GeoLocation other) {
double hereLat = Math.toRadians(latitude);
double hereLon = Math.toRadians(longitude);
double thereLat = Math.toRadians(other.latitude);
double thereLon = Math.toRadians(other.longitude);
double cos = Math.sin(hereLat) * Math.sin(thereLat) +
Math.cos(hereLat) * Math.cos(thereLat) * Math.cos(hereLon - thereLon);
return Math.acos(cos) * EARTH_RADIUS_KM;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("latitude", latitude)
.add("longitude", longitude)
.toString();
}
}
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