001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006     *
007     * Project Info:  http://www.jfree.org/jfreechart/index.html
008     *
009     * This library is free software; you can redistribute it and/or modify it 
010     * under the terms of the GNU Lesser General Public License as published by 
011     * the Free Software Foundation; either version 2.1 of the License, or 
012     * (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but 
015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017     * License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public
020     * License along with this library; if not, write to the Free Software
021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022     * USA.  
023     *
024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025     * in the United States and other countries.]
026     *
027     * -------------------------
028     * ContourPlotUtilities.java
029     * -------------------------
030     * (C) Copyright 2002-2004, by David M. O'Donnell and Contributors.
031     *
032     * Original Author:  David M. O'Donnell;
033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
034     *
035     * $Id: ContourPlotUtilities.java,v 1.2.2.1 2005/10/25 20:52:08 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 26-Nov-2002 : Version 1 contributed by David M. O'Donnell (DG);
040     * 22-Jul-2003 : Made this class abstract as there is no need to instantiate 
041     *               it (DG);
042     *
043     */
044    
045    package org.jfree.chart.plot;
046    
047    import org.jfree.data.Range;
048    import org.jfree.data.contour.ContourDataset;
049    import org.jfree.data.contour.DefaultContourDataset;
050    
051    /**
052     * Some utility methods for the {@link ContourPlot} class.
053     *
054     * @author David M. O'Donnell
055     */
056    public abstract class ContourPlotUtilities {
057    
058        /**
059         * Returns the visible z-range.
060         *
061         * @param data  the dataset.
062         * @param x  the x range.
063         * @param y  the y range.
064         *
065         * @return The range.
066         */
067        public static Range visibleRange(ContourDataset data, Range x, Range y) {
068            Range range = null;
069            range = ((DefaultContourDataset) data).getZValueRange(x, y);
070            return range;
071        }
072    
073    }