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This is a Java implementation of the geodesic algorithms from GeographicLib. This is a self-contained library to solve geodesic problems on an ellipsoid model of the earth. It requires Java version 1.7 or later.

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/**
 * Implementation of the net.sf.geographiclib.GnomonicData class
 *
 * Copyright (c) BMW Car IT GmbH (2014-2016) 
 * and licensed under the MIT/X11 License. For more information, see
 * http://geographiclib.sourceforge.net/
 **********************************************************************/
package net.sf.geographiclib;

/**
 * The results of gnomonic projection.
 * 

 * This is used to return the results for a gnomonic projection of a point
 * (lat, lon) given a center point of projection (lat0,
 * lon0). The returned GnomonicData objects always include the
 * parameters provided to
 * {@link Gnomonic#Forward Gnomonic.Forward}
 * and
 * {@link Gnomonic#Reverse Gnomonic.Reverse}
 * and it always includes the fields x, y, azi. and
 * rk.
 **********************************************************************/
public class GnomonicData {
  /**
   * latitude of center point of projection (degrees).
   **********************************************************************/
  public double lat0;
  /**
   * longitude of center point of projection (degrees).
   **********************************************************************/
  public double lon0;
  /**
   * latitude of point (degrees).
   **********************************************************************/
  public double lat;
  /**
   * longitude of point (degrees).
   **********************************************************************/
  public double lon;
  /**
   * easting of point (meters).
   **********************************************************************/
  public double x;
  /**
   * northing of point (meters).
   **********************************************************************/
  public double y;
  /**
   * azimuth of geodesic at point (degrees).
   **********************************************************************/
  public double azi;
  /**
   * reciprocal of azimuthal scale at point.
   **********************************************************************/
  public double rk;

  /**
   * Initialize all the fields to Double.NaN.
   **********************************************************************/
  public GnomonicData() {
    lat0 = lon0 = lat = lon = x = y = azi = rk = Double.NaN;
  }

  /**
   * Constructor initializing all the fields for gnomonic projection of a point
   * (lat, lon) given a center point of projection (lat0,
   * lon0).
   * 
   * @param lat0
   *          latitude of center point of projection (degrees).
   * @param lon0
   *          longitude of center point of projection (degrees).
   * @param lat
   *          latitude of point (degrees).
   * @param lon
   *          longitude of point (degrees).
   * @param x
   *          easting of point (meters).
   * @param y
   *          northing of point (meters).
   * @param azi
   *          azimuth of geodesic at point (degrees).
   * @param rk
   *          reciprocal of azimuthal scale at point.
   */
  public GnomonicData(double lat0, double lon0, double lat, double lon,
      double x, double y, double azi, double rk) {
    this.lat0 = lat0;
    this.lon0 = lon0;
    this.lat = lat;
    this.lon = lon;
    this.x = x;
    this.y = y;
    this.azi = azi;
    this.rk = rk;
  }
}