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 {
    /**
     * Gets the relative bearing from one geographical coordinate to another.
     *
     * @param latitude1 the latitude of the source point
     * @param longitude1 the longitude of the source point
     * @param latitude2 the latitude of the destination point
     * @param longitude2 the longitude of the destination point
     * @return the relative bearing from point 1 to point 2, in degrees. The result is guaranteed
     *         to fall in the range 0-360
     */
    public static float getBearing(double latitude1, double longitude1, double latitude2, double longitude2) {
        latitude1 = Math.toRadians(latitude1);
        longitude1 = Math.toRadians(longitude1);
        latitude2 = Math.toRadians(latitude2);
        longitude2 = Math.toRadians(longitude2);

        double dLon = longitude2 - longitude1;

        double y = Math.sin(dLon) * Math.cos(latitude2);
        double x = Math.cos(latitude1) * Math.sin(latitude2)
                - Math.sin(latitude1) * Math.cos(latitude2) * Math.cos(dLon);

        double bearing = Math.atan2(y, x);
        return mod((float) Math.toDegrees(bearing), 360.0f);
    }

    /**
     * Calculates {@code a mod b} in a way that respects negative values (for example,
     * {@code mod(-1, 5) == 4}, rather than {@code -1}).
     *
     * @param a the dividend
     * @param b the divisor
     * @return {@code a mod b}
     */
    public static int mod(int a, int b) {
        return (a % b + b) % b;
    }

    /**
     * Calculates {@code a mod b} in a way that respects negative values (for example,
     * {@code mod(-1, 5) == 4}, rather than {@code -1}).
     *
     * @param a the dividend
     * @param b the divisor
     * @return {@code a mod b}
     */
    public static float mod(float a, float b) {
        return (a % b + b) % b;
    }
}