/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ----------------
 * WindDataset.java
 * ----------------
 * (C) Copyright 2001-2006, by Achilleus Mantzios and Contributors.
 *
 * Original Author:  Achilleus Mantzios;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: WindDataset.java,v 1.2.2.2 2006/07/12 13:50:48 mungady Exp $
 *
 * Changes
 * -------
 * 06-Feb-2002 : Version 1, based on code contributed by Achilleus 
 *               Mantzios (DG);
 *
 */

package org.jfree.data.xy;

/**
 * Interface for a dataset that supplies wind intensity and direction values
 * observed at various points in time.
 */
public interface WindDataset extends XYDataset {

    /**
     * Returns the wind direction (should be in the range 0 to 12, 
     * corresponding to the positions on an upside-down clock face).
     * 
     * @param series  the series (in the range <code>0</code> to 
     *     <code>getSeriesCount() - 1</code>).
     * @param item  the item (in the range <code>0</code> to 
     *     <code>getItemCount(series) - 1</code>).
     * 
     * @return The wind direction.
     */
    public Number getWindDirection(int series, int item);

    /**
     * Returns the wind force on the Beaufort scale (0 to 12).  See:
     * <p>
     * http://en.wikipedia.org/wiki/Beaufort_scale
     * 
     * @param series  the series (in the range <code>0</code> to 
     *     <code>getSeriesCount() - 1</code>).
     * @param item  the item (in the range <code>0</code> to 
     *     <code>getItemCount(series) - 1</code>).
     *     
     * @return The wind force.
     */
    public Number getWindForce(int series, int item);

}
