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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * --------------- 28: * EmptyBlock.java 29: * --------------- 30: * (C) Copyright 2004-2007, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes: 36: * -------- 37: * 22-Oct-2004 : Version 1 (DG); 38: * 04-Feb-2005 : Now cloneable and serializable (DG); 39: * 20-Apr-2005 : Added new draw() method (DG); 40: * 41: */ 42: 43: package org.jfree.chart.block; 44: 45: import java.awt.Graphics2D; 46: import java.awt.geom.Rectangle2D; 47: import java.io.Serializable; 48: 49: import org.jfree.util.PublicCloneable; 50: 51: /** 52: * An empty block with a fixed size. 53: */ 54: public class EmptyBlock extends AbstractBlock 55: implements Block, Cloneable, PublicCloneable, 56: Serializable { 57: 58: /** For serialization. */ 59: private static final long serialVersionUID = -4083197869412648579L; 60: 61: /** 62: * Creates a new block with the specified width and height. 63: * 64: * @param width the width. 65: * @param height the height. 66: */ 67: public EmptyBlock(double width, double height) { 68: setWidth(width); 69: setHeight(height); 70: } 71: 72: /** 73: * Draws the block. Since the block is empty, this method does nothing. 74: * 75: * @param g2 the graphics device. 76: * @param area the area. 77: */ 78: public void draw(Graphics2D g2, Rectangle2D area) { 79: // do nothing, we're empty 80: } 81: 82: /** 83: * Draws the block within the specified area. Since the block is empty, 84: * this method does nothing. 85: * 86: * @param g2 the graphics device. 87: * @param area the area. 88: * @param params ignored (<code>null</code> permitted). 89: * 90: * @return Always <code>null</code>. 91: */ 92: public Object draw(Graphics2D g2, Rectangle2D area, Object params) { 93: return null; 94: } 95: 96: /** 97: * Returns a clone of the block. 98: * 99: * @return A clone. 100: * 101: * @throws CloneNotSupportedException if there is a problem cloning. 102: */ 103: public Object clone() throws CloneNotSupportedException { 104: return super.clone(); 105: } 106: 107: }