001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2006-2008, 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
042 package org.jfree.chart.renderer;
043
044 import java.awt.Paint;
045
046 import 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 */
059 public 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 }