Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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.
 */

public class Main {
    /** The Earth's radius, in kilometers. */
    private static final double EARTH_RADIUS_KM = 6371.0;

    /**
     * Gets the great circle distance in kilometers between two geographical points, using
     * the <a href="http://en.wikipedia.org/wiki/Haversine_formula">haversine formula</a>.
     *
     * @param latitude1 the latitude of the first point
     * @param longitude1 the longitude of the first point
     * @param latitude2 the latitude of the second point
     * @param longitude2 the longitude of the second point
     * @return the distance, in kilometers, between the two points
     */
    public static float getDistance(double latitude1, double longitude1, double latitude2, double longitude2) {
        double dLat = Math.toRadians(latitude2 - latitude1);
        double dLon = Math.toRadians(longitude2 - longitude1);
        double lat1 = Math.toRadians(latitude1);
        double lat2 = Math.toRadians(latitude2);
        double sqrtHaversineLat = Math.sin(dLat / 2);
        double sqrtHaversineLon = Math.sin(dLon / 2);
        double a = sqrtHaversineLat * sqrtHaversineLat
                + sqrtHaversineLon * sqrtHaversineLon * Math.cos(lat1) * Math.cos(lat2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

        return (float) (EARTH_RADIUS_KM * c);
    }
}