A not super efficient mapping from a starting lat/long + a distance at a certain direction - Android App

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Description

A not super efficient mapping from a starting lat/long + a distance at a certain direction

Demo Code

/*******************************************************************************
 * Gaggle is Copyright 2010 by Geeksville Industries LLC, a California limited liability corporation. 
 * /*from   w w  w.jav  a 2  s  .c o m*/
 * Gaggle is distributed under a dual license.  We've chosen this approach because within Gaggle we've used a number
 * of components that Geeksville Industries LLC might reuse for commercial products.  Gaggle can be distributed under
 * either of the two licenses listed below.
 * 
 * This program 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. 
 * 
 * Commercial Distribution License
 * If you would like to distribute Gaggle (or portions thereof) under a license other than 
 * the "GNU General Public License, version 2", contact Geeksville Industries.  Geeksville Industries reserves
 * the right to release Gaggle source code under a commercial license of its choice.
 * 
 * GNU Public License, version 2
 * All other distribution of Gaggle must conform to the terms of the GNU Public License, version 2.  The full
 * text of this license is included in the Gaggle source, see assets/manual/gpl-2.0.txt.
 ******************************************************************************/
//package com.java2s;

public class Main {
    /**
     * A not super efficient mapping from a starting lat/long + a distance at a
     * certain direction
     * 
     * @param lat
     * @param longitude
     * @param distMeters
     * @param theta
     *            in radians, 0 == north
     * @return an array with lat and long
     */
    public static double[] addDistance(double lat, double longitude,
            double distMeters, double theta) {
        double dx = distMeters * Math.sin(theta); // theta measured clockwise
        // from due north
        double dy = distMeters * Math.cos(theta); // dx, dy same units as R

        double dLong = dx / (111320 * Math.cos(lat)); // dx, dy in meters
        double dLat = dy / 110540; // result in degrees long/lat

        return new double[] { lat + dLat, longitude + dLong };
    }
}

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