convert from one unit of length to another - Java java.lang

Java examples for java.lang:Math Convert

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Description

convert from one unit of length to another

Demo Code

/*/*ww w  . j  a  v  a  2 s. c  o  m*/
 * Copyright (C) 2012, 2013 The MaGDAA Project
 *
 * This file is part of the MaGDAA Library Software
 *
 * MaGDAA Library Software is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        float length = 2.45678f;
        int fromScale = 2;
        int toScale = 2;
        System.out.println(convertLength(length, fromScale, toScale));
    }

    /**
     * constant to define the millimetre scale
     */
    public static final int MILLIMETRE = 30;
    /**
     * constant to define the inch scale
     */
    public static final int INCH = 31;

    /**
     * convert from one unit of length to another
     * @param length the length reading to convert
     * @param fromScale the from scale, as define by one of the length related constants in this class
     * @param toScale the to scale, as defined by one of the length related constants in this class
     * @return the converted length measurement
     * @throws IllegalArgumentException if an invalid scale is provided
     * @return the length in the to measurement scale
     */
    public static float convertLength(float length, int fromScale,
            int toScale) {
        switch (fromScale) {
        case MILLIMETRE:
            // convert from millimetre
            switch (toScale) {
            case INCH:
                return convertFromMillimetreToInch(length);
            default:
                throw new IllegalArgumentException("invalid to scale");
            }
        case INCH:
            // convert from inch
            switch (toScale) {
            case MILLIMETRE:
                return convertFromInchToMillimetre(length);
            default:
                throw new IllegalArgumentException("invalid to scale");
            }
        default:
            throw new IllegalArgumentException("invalid from scale");
        }
    }

    private static float convertFromMillimetreToInch(float length) {
        return length * 0.0393700787f;

    }

    private static float convertFromInchToMillimetre(float length) {
        return length * 25.4f;
    }
}

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