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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2008, 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 2004-2008, 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: * 08-Apr-2008 : Added support for margin and border (DG); 41: * 08-May-2008 : Updated arrange() method to recognise 42: * incoming constraint (DG); 43: * 44: */ 45: 46: package org.jfree.chart.block; 47: 48: import java.awt.Graphics2D; 49: import java.awt.geom.Rectangle2D; 50: import java.io.Serializable; 51: 52: import org.jfree.ui.Size2D; 53: import org.jfree.util.PublicCloneable; 54: 55: /** 56: * An empty block with a fixed size. 57: */ 58: public class EmptyBlock extends AbstractBlock 59: implements Block, Cloneable, PublicCloneable, Serializable { 60: 61: /** For serialization. */ 62: private static final long serialVersionUID = -4083197869412648579L; 63: 64: /** 65: * Creates a new block with the specified width and height. 66: * 67: * @param width the width. 68: * @param height the height. 69: */ 70: public EmptyBlock(double width, double height) { 71: setWidth(width); 72: setHeight(height); 73: } 74: 75: /** 76: * Arranges the contents of the block, within the given constraints, and 77: * returns the block size. 78: * 79: * @param g2 the graphics device. 80: * @param constraint the constraint (<code>null</code> not permitted). 81: * 82: * @return The block size (in Java2D units, never <code>null</code>). 83: */ 84: public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) { 85: Size2D base = new Size2D(calculateTotalWidth(getWidth()), 86: calculateTotalHeight(getHeight())); 87: return constraint.calculateConstrainedSize(base); 88: } 89: 90: /** 91: * Draws the block. Since the block is empty, there is nothing to draw 92: * except the optional border. 93: * 94: * @param g2 the graphics device. 95: * @param area the area. 96: */ 97: public void draw(Graphics2D g2, Rectangle2D area) { 98: draw(g2, area, null); 99: } 100: 101: /** 102: * Draws the block within the specified area. Since the block is empty, 103: * there is nothing to draw except the optional border. 104: * 105: * @param g2 the graphics device. 106: * @param area the area. 107: * @param params ignored (<code>null</code> permitted). 108: * 109: * @return Always <code>null</code>. 110: */ 111: public Object draw(Graphics2D g2, Rectangle2D area, Object params) { 112: area = trimMargin(area); 113: drawBorder(g2, area); 114: return null; 115: } 116: 117: /** 118: * Returns a clone of the block. 119: * 120: * @return A clone. 121: * 122: * @throws CloneNotSupportedException if there is a problem cloning. 123: */ 124: public Object clone() throws CloneNotSupportedException { 125: return super.clone(); 126: } 127: 128: }