Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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 {
    /**
     * Computes the bearing in degrees between two points on Earth.
     * 
     * @param lat1 Latitude of the first point
     * @param lon1 Longitude of the first point
     * @param lat2 Latitude of the second point
     * @param lon2 Longitude of the second point
     * @return Bearing between the two points in degrees. A value of 0 means due
     *         north.
     */
    public static double bearing(double lat1, double lon1, double lat2, double lon2) {
        double lat1Rad = Math.toRadians(lat1);
        double lat2Rad = Math.toRadians(lat2);
        double deltaLonRad = Math.toRadians(lon2 - lon1);

        double y = Math.sin(deltaLonRad) * Math.cos(lat2Rad);
        double x = Math.cos(lat1Rad) * Math.sin(lat2Rad)
                - Math.sin(lat1Rad) * Math.cos(lat2Rad) * Math.cos(deltaLonRad);
        return radToBearing(Math.atan2(y, x));
    }

    /**
     * Converts an angle in radians to degrees
     */
    public static double radToBearing(double rad) {
        return (Math.toDegrees(rad) + 360) % 360;
    }
}