Compute the absolute difference (in degrees) between two directions. - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

Compute the absolute difference (in degrees) between two directions.

Demo Code

/* Copyright (c) 2011 Danish Maritime Authority.
 *
 * 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./*from  w  ww  .  ja v a  2s .c o  m*/
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        float dir1 = 2.45678f;
        float dir2 = 2.45678f;
        System.out.println(absoluteDirectionalDifference(dir1, dir2));
    }

    /**
     * Compute the absolute difference (in degrees) between two directions.
     * @param dir1 Direction no. 1 - measured in degrees [0; 360);
     * @param dir2 Direction no. 2 - measured in degrees [0; 360);
     * @return the absolute difference between dir1 and dir2 [0; 180).
     */
    @SuppressWarnings("unused")
    public static float absoluteDirectionalDifference(float dir1, float dir2) {
        dir1 = directionInCompassRange(dir1);
        dir2 = directionInCompassRange(dir2);

        float diff = dir1 > dir2 ? dir1 - dir2 : dir2 - dir1;

        if (diff >= 180.0) {
            diff = 360.0f - diff;
        }

        return diff;
    }

    /**
     * Convert the input to a number of degrees lying inside the compass
     * circle. E.g. -45 -> 315 or 370 -> 10.
     *
     * Or: Map any float point number into the set [0; 360).
     *
     * @param degrees the no. degrees given as input
     * @return the corresponding no. of degrees inside the compass circle.
     */
    @SuppressWarnings("unused")
    public static float directionInCompassRange(float degrees) {
        degrees = degrees % 360.0f;
        if (degrees < 0.0) {
            degrees += 360.0f;
        }
        return degrees;
    }
}

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