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 * Changes
036 * -------
037 * 05-Jul-2006 : Version 1 (DG);
038 * 31-Jan-2007 : Added getLowerBound() and getUpperBound() methods (DG);
039 * 
040 */
041
042package org.jfree.chart.renderer;
043
044import java.awt.Paint;
045
046import org.jfree.chart.renderer.xy.XYBlockRenderer;
047
048/**
049 * A source for <code>Paint</code> instances, used by the 
050 * {@link XYBlockRenderer}.  
051 * <br><br>
052 * NOTE: Classes that implement this interface should also implement 
053 * <code>PublicCloneable</code> and <code>Serializable</code>, so 
054 * that any renderer (or other object instance) that references an instance of 
055 * this interface can still be cloned or serialized.
056 * 
057 * @since 1.0.4
058 */
059public interface PaintScale {
060    
061    /**
062     * Returns the lower bound for the scale.
063     * 
064     * @return The lower bound.
065     * 
066     * @see #getUpperBound()
067     */
068    public double getLowerBound();
069    
070    /**
071     * Returns the upper bound for the scale.
072     * 
073     * @return The upper bound.
074     * 
075     * @see #getLowerBound()
076     */
077    public double getUpperBound();
078    
079    /**
080     * Returns a <code>Paint</code> instance for the specified value.
081     * 
082     * @param value  the value.
083     * 
084     * @return A <code>Paint</code> instance (never <code>null</code>).
085     */
086    public Paint getPaint(double value);
087    
088}