/*
 * $Id: SGTPoint.java,v 1.7 2003/08/22 23:02:38 dwd Exp $
 *
 * This software is provided by NOAA for full, free and open release.  It is
 * understood by the recipient/user that NOAA assumes no liability for any
 * errors contained in the code.  Although this software is released without
 * conditions or restrictions in its use, it is expected that appropriate
 * credit be given to its author and to the National Oceanic and Atmospheric
 * Administration should the software be included by the recipient as an
 * element in other product development.
 */

package sgtplot.dm;

import sgtplot.util.GeoDate;

/**
 * Defines a data object to be of Point type. Interpretation
 * of X and Y is determined by the CoordinateSystem.  For
 * Cartesian, X and Y are the Cartesian coordinates. For
 * Polar,
 * X and Y are R (radius) and Theta (angle), respectively.
 *
 * The SGTPoint interface only defines data access, not how
 * the data will be constructed or set.
 *
 * @author Donald Denbo
 * @version $Revision: 1.7 $, $Date: 2003/08/22 23:02:38 $
 * @since 1.0
 * @see SGTData
 * @see CoordinateSystem
 * @see Cartesian
 * @see Polar
 * @see SimplePoint
 */
public interface SGTPoint extends SGTData {
  /**
   * Get the x coordinate.
   */
  public double getX();
  /**
   * Get the y coordinate.
   */
  public double getY();
  /**
   * Test if a value is associated with the SGTPoint.
   */
  public boolean hasValue();
  /**
   * Get the associated value.
   */
  public double getValue();
  /**
   * Get the SGTMetaData object associated with the value.
   */
  public SGTMetaData getValueMetaData();
  /**
   * Get the Time value.
   */
  public GeoDate getTime();
  /**
   * Get the time as long referenced from
   * 1970-01-01.
   *
   * @since 3.0
   */
  public long getLongTime();
}