Java BigDecimal Calculate calcDistance(final BigDecimal x1, final BigDecimal y1, final BigDecimal x2, final BigDecimal y2)

Description

Calculates distance traveled between two sequential messages.

License

Open Source License

Parameter

Parameter	Description
x1	= long1
y1	= lat1
x2	= long2
y2	= lat2

Declaration

public static double calcDistance(final BigDecimal x1, final BigDecimal y1, final BigDecimal x2,
        final BigDecimal y2) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.math.BigDecimal;

public class Main {
    /**//from w w w  .  j  a  va 2  s.c o m
     * Calculates distance traveled between two sequential messages.
     * 
     * @param x1
     *            = long1
     * @param y1
     *            = lat1
     * @param x2
     *            = long2
     * @param y2
     *            = lat2
     * @return
     */
    public static double calcDistance(final BigDecimal x1, final BigDecimal y1, final BigDecimal x2,
            final BigDecimal y2) {
        return calcDistance(x1.doubleValue(), y1.doubleValue(), x2.doubleValue(), y2.doubleValue());
    }

    /**
     * Calculates distance traveled between two sequential messages.
     * 
     * @param x1
     *            = long1
     * @param y1
     *            = lat1
     * @param x2
     *            = long2
     * @param y2
     *            = lat2
     * @return
     */
    public static double calcDistance(final double x1, final double y1, final double x2, final double y2) {
        return distanceInMetersBetween(y1, x1, y2, x2);
    }

    /**
     * Calculates a distance between two "world" points.
     * 
     * @see http://stackoverflow.com/questions/837872/calculate-distance-in-meters-when-you-know-longitude-and-latitude-in-java
     * 
     * @param lat1
     * @param lng1
     * @param lat2
     * @param lng2
     * @return
     */
    private static double distanceInMetersBetween(final double lat1, final double lng1, final double lat2,
            final double lng2) {
        final double earthRadius = 3958.75;
        final double dLat = Math.toRadians(lat2 - lat1);
        final double dLng = Math.toRadians(lng2 - lng1);
        final double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(lat1))
                * Math.cos(Math.toRadians(lat2)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);
        final double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        final double dist = earthRadius * c;

        final int meterConversion = 1609;

        return dist * meterConversion;
    }
}

Related

1. calcBMI(BigDecimal lbs, BigDecimal inches)
2. calcPercentage(int priceInCents, BigDecimal vat)
3. calculate(BigDecimal number1, String operator, BigDecimal number2, int decimalPlaces)
4. calculateArithmeticMean(BigDecimal[] values)
5. calculateDayRate(BigDecimal rate, BigDecimal money)