Java Number Round roundRadian(double rad)

Description

Round radian value in range -pi/2 to pi/2

License

LGPL

Parameter

Parameter	Description
rad	a parameter

Declaration

public static double roundRadian(double rad) 

Method Source Code

//package com.java2s;
/*/*from   w  w  w. j  ava 2  s .  c  o  m*/
 * PROJECT: Phybots at http://phybots.com/
 * ----------------------------------------------------------------------------
 *
 * This file is part of Phybots.
 * Phybots is a Java/Processing toolkit for making robotic things.
 *
 * ----------------------------------------------------------------------------
 *
 * License version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Phybots.
 *
 * The Initial Developer of the Original Code is Jun Kato.
 * Portions created by the Initial Developer are
 * Copyright (C) 2009 Jun Kato. All Rights Reserved.
 *
 * Contributor(s): Jun Kato
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */

public class Main {
    /**
     * Round radian value in range -pi/2 to pi/2
     * @param rad
     * @return
     */
    public static double roundRadian(double rad) {
        final double pi2 = Math.PI * 2;
        if (rad > 0) {
            return rad - pi2 * (int) ((rad + Math.PI) / pi2);
            // while (rad > Math.PI) { rad += 2*Math.PI; }
        } else {
            return rad + pi2 * (int) ((-rad + Math.PI) / pi2);
            // while (rad < Math.PI) { rad -= 2*Math.PI; }
        }
    }
}

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