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: * EmptyBlock.java
029: * ---------------
030: * (C) Copyright 2004, 2005, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited);
033: * Contributor(s): -;
034: *
035: * $Id: EmptyBlock.java,v 1.4.2.1 2005/10/25 20:39:38 mungady Exp $
036: *
037: * Changes:
038: * --------
039: * 22-Oct-2004 : Version 1 (DG);
040: * 04-Feb-2005 : Now cloneable and serializable (DG);
041: * 20-Apr-2005 : Added new draw() method (DG);
042: *
043: */
044:
045: package org.jfree.chart.block;
046:
047: import java.awt.Graphics2D;
048: import java.awt.geom.Rectangle2D;
049: import java.io.Serializable;
050:
051: import org.jfree.util.PublicCloneable;
052:
053: /**
054: * An empty block with a fixed size.
055: */
056: public class EmptyBlock extends AbstractBlock implements Block,
057: Cloneable, PublicCloneable, Serializable {
058:
059: /** For serialization. */
060: private static final long serialVersionUID = -4083197869412648579L;
061:
062: /**
063: * Creates a new block with the specified width and height.
064: *
065: * @param width the width.
066: * @param height the height.
067: */
068: public EmptyBlock(double width, double height) {
069: setWidth(width);
070: setHeight(height);
071: }
072:
073: /**
074: * Draws the block. Since the block is empty, this method does nothing.
075: *
076: * @param g2 the graphics device.
077: * @param area the area.
078: */
079: public void draw(Graphics2D g2, Rectangle2D area) {
080: // do nothing, we're empty
081: }
082:
083: /**
084: * Draws the block within the specified area. Since the block is empty,
085: * this method does nothing.
086: *
087: * @param g2 the graphics device.
088: * @param area the area.
089: * @param params ignored (<code>null</code> permitted).
090: *
091: * @return Always <code>null</code>.
092: */
093: public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
094: return null;
095: }
096:
097: /**
098: * Returns a clone of the block.
099: *
100: * @return A clone.
101: *
102: * @throws CloneNotSupportedException if there is a problem cloning.
103: */
104: public Object clone() throws CloneNotSupportedException {
105: return super.clone();
106: }
107:
108: }
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