intervalxydataset.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ----------------------
 * IntervalXYDataset.java
 * ----------------------
 * (C) Copyright 2001-2003, by Object Refinery Limited and Contributors.
 *
 * Original Author:  Mark Watson (www.markwatson.com);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: IntervalXYDataset.java,v 1.3 2003/07/10 07:16:45 mungady Exp $
 *
 * Changes
 * -------
 * 18-Oct-2001 : Version 1, thanks to Mark Watson (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc (DG);
 *
 */

package org.jfree.data;

/**
 * An extension of the {@link XYDataset} interface that allows a range of data to be
 * defined for the X values, the Y values, or both the X and Y values.
 * <P>
 * This versatile interface will be used to support (among other things) bar
 * plots against numerical axes.
 *
 * @author Mark Watson
 */
public interface IntervalXYDataset extends XYDataset {

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item within a series (zero-based index).
     *
     * @return the starting X value for the specified series and item.
     */
    public Number getStartXValue(int series, int item);

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item within a series (zero-based index).
     *
     * @return the ending X value for the specified series and item.
     */
    public Number getEndXValue(int series, int item);

    /**
     * Returns the starting Y value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item within a series (zero-based index).
     *
     * @return starting Y value for the specified series and item.
     */
    public Number getStartYValue(int series, int item);

    /**
     * Returns the ending Y value for the specified series and item.
     *
     * @param series  the series (zero-based index).
     * @param item  the item within a series (zero-based index).
     *
     * @return the ending Y value for the specified series and item.
     */
    public Number getEndYValue(int series, int item);

}