001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2007, 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     * PaintScale.java
029     * ---------------
030     * (C) Copyright 2006, 2007, by Object Refinery Limited.
031     *
032     * Original Author:  David Gilbert (for Object Refinery Limited);
033     * Contributor(s):   -;
034     *
035     * $Id: PaintScale.java,v 1.1.2.2 2007/01/31 14:31:24 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 05-Jul-2006 : Version 1 (DG);
040     * 31-Jan-2007 : Added getLowerBound() and getUpperBound() methods (DG);
041     * 
042     */
043    
044    package org.jfree.chart.renderer;
045    
046    import java.awt.Paint;
047    
048    import org.jfree.chart.renderer.xy.XYBlockRenderer;
049    
050    /**
051     * A source for <code>Paint</code> instances, used by the 
052     * {@link XYBlockRenderer}.  
053     * <br><br>
054     * NOTE: Classes that implement this interface should also implement 
055     * <code>PublicCloneable</code> and <code>Serializable</code>, so 
056     * that any renderer (or other object instance) that references an instance of 
057     * this interface can still be cloned or serialized.
058     * 
059     * @since 1.0.4
060     */
061    public interface PaintScale {
062        
063        /**
064         * Returns the lower bound for the scale.
065         * 
066         * @return The lower bound.
067         * 
068         * @see #getUpperBound()
069         */
070        public double getLowerBound();
071        
072        /**
073         * Returns the upper bound for the scale.
074         * 
075         * @return The upper bound.
076         * 
077         * @see #getLowerBound()
078         */
079        public double getUpperBound();
080        
081        /**
082         * Returns a <code>Paint</code> instance for the specified value.
083         * 
084         * @param value  the value.
085         * 
086         * @return A <code>Paint</code> instance (never <code>null</code>).
087         */
088        public Paint getPaint(double value);
089        
090    }