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/*
* Copyright (C) 2021 Samsung Electronics
* 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.onap.a1pesimulator.util;
public class DistanceCalculator {
private static final int EARTH_RADIUS = 6371; // Earth radius in KM
private DistanceCalculator() {
}
/**
* Calculate distance in KM using Haversine formula
*/
public static double calculate(double startLat, double startLong, double endLat, double endLong) {
return haversine(startLat, startLong, endLat, endLong);
}
public static boolean isInRange(double startLat, double startLong, double endLat, double endLong, double range) {
double distance = calculate(startLat, startLong, endLat, endLong);
return distance < range;
}
private static double haversine(double startLat, double startLong, double endLat, double endLong) {
double dLat = Math.toRadians(endLat - startLat);
double dLon = Math.toRadians(endLong - startLong);
double startLatInRadians = Math.toRadians(startLat);
double endLatInRadians = Math.toRadians(endLat);
double a = Math.pow(Math.sin(dLat / 2), 2) + Math.pow(Math.sin(dLon / 2), 2) * Math.cos(startLatInRadians)
* Math.cos(endLatInRadians);
double c = 2 * Math.asin(Math.sqrt(a));
return EARTH_RADIUS * c;
}
}
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