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

Java examples for java.lang:Math Convert

  1. HOME
  2. Java
  3. java.lang
  4. Math Convert

Description

convert from one unit of barometric pressure to another

Demo Code

/*//w  w w. jav a  2s.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 pressure = 2.45678f;
        int fromScale = 2;
        int toScale = 2;
        System.out.println(convertBarometricPressure(pressure, fromScale,
                toScale));
    }

    /**
     * constant to define the hPa barometric scale
     */
    public static final int HPA = 20;
    /**
     * constant to define the hg inch barometric scale
     */
    public static final int HG_INCH = 21;

    /**
     * convert from one unit of barometric pressure to another
     * @param pressure the pressure reading to convert
     * @param fromScale the from scale, as defined by one of the pressure related constants in this class
     * @param toScale the to scale, as defined by one of the pressure related constants in this class
     * @return the converted pressure measurement
     * @throws IllegalArgumentException if an invalid scale is provided
     */
    public static float convertBarometricPressure(float pressure,
            int fromScale, int toScale) {
        switch (fromScale) {
        case HPA:
            // convert from hPa
            switch (toScale) {
            case HG_INCH:
                return convertFromHpaToHgInch(pressure);
            default:
                throw new IllegalArgumentException("invalid toScale");
            }
        case HG_INCH:
            // convert from hg inches
            switch (toScale) {
            case HPA:
                return convertFromHgInchToHpa(pressure);
            default:
                throw new IllegalArgumentException("invalid toScale");
            }
        default:
            throw new IllegalArgumentException("invalid fromScale");
        }
    }

    private static float convertFromHpaToHgInch(float hpa) {
        float conversionFactor = 33.8638866667f;
        return hpa / conversionFactor;
    }

    private static float convertFromHgInchToHpa(float hgInch) {
        float conversionFactor = 33.8638866667f;
        return hgInch * conversionFactor;
    }
}

Related Tutorials