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 * ColorBlock.java 029 * --------------- 030 * (C) Copyright 2004, 2007, by Object Refinery Limited. 031 * 032 * Original Author: David Gilbert (for Object Refinery Limited); 033 * Contributor(s): -; 034 * 035 * Changes: 036 * -------- 037 * 22-Oct-2004 : Version 1 (DG); 038 * 20-Apr-2005 : Added new draw() method (DG); 039 * ------------- JFREECHART 1.0.x --------------------------------------------- 040 * 16-Mar-2007 : Implemented equals() and fixed serialization (DG); 041 * 042 */ 043 044 package org.jfree.chart.block; 045 046 import java.awt.Graphics2D; 047 import java.awt.Paint; 048 import java.awt.geom.Rectangle2D; 049 import java.io.IOException; 050 import java.io.ObjectInputStream; 051 import java.io.ObjectOutputStream; 052 053 import org.jfree.io.SerialUtilities; 054 import org.jfree.util.PaintUtilities; 055 056 /** 057 * A block that is filled with a single color. 058 */ 059 public class ColorBlock extends AbstractBlock implements Block { 060 061 /** For serialization. */ 062 static final long serialVersionUID = 3383866145634010865L; 063 064 /** The paint. */ 065 private transient Paint paint; 066 067 /** 068 * Creates a new block. 069 * 070 * @param paint the paint (<code>null</code> not permitted). 071 * @param width the width. 072 * @param height the height. 073 */ 074 public ColorBlock(Paint paint, double width, double height) { 075 if (paint == null) { 076 throw new IllegalArgumentException("Null 'paint' argument."); 077 } 078 this.paint = paint; 079 setWidth(width); 080 setHeight(height); 081 } 082 083 /** 084 * Returns the paint. 085 * 086 * @return The paint (never <code>null</code>). 087 * 088 * @since 1.0.5 089 */ 090 public Paint getPaint() { 091 return this.paint; 092 } 093 094 /** 095 * Draws the block. 096 * 097 * @param g2 the graphics device. 098 * @param area the area. 099 */ 100 public void draw(Graphics2D g2, Rectangle2D area) { 101 Rectangle2D bounds = getBounds(); 102 g2.setPaint(this.paint); 103 g2.fill(bounds); 104 } 105 106 /** 107 * Draws the block within the specified area. 108 * 109 * @param g2 the graphics device. 110 * @param area the area. 111 * @param params ignored (<code>null</code> permitted). 112 * 113 * @return Always <code>null</code>. 114 */ 115 public Object draw(Graphics2D g2, Rectangle2D area, Object params) { 116 draw(g2, area); 117 return null; 118 } 119 120 /** 121 * Tests this block for equality with an arbitrary object. 122 * 123 * @param obj the object (<code>null</code> permitted). 124 * 125 * @return A boolean. 126 */ 127 public boolean equals(Object obj) { 128 if (obj == this) { 129 return true; 130 } 131 if (!(obj instanceof ColorBlock)) { 132 return false; 133 } 134 ColorBlock that = (ColorBlock) obj; 135 if (!PaintUtilities.equal(this.paint, that.paint)) { 136 return false; 137 } 138 return super.equals(obj); 139 } 140 141 /** 142 * Provides serialization support. 143 * 144 * @param stream the output stream. 145 * 146 * @throws IOException if there is an I/O error. 147 */ 148 private void writeObject(ObjectOutputStream stream) throws IOException { 149 stream.defaultWriteObject(); 150 SerialUtilities.writePaint(this.paint, stream); 151 } 152 153 /** 154 * Provides serialization support. 155 * 156 * @param stream the input stream. 157 * 158 * @throws IOException if there is an I/O error. 159 * @throws ClassNotFoundException if there is a classpath problem. 160 */ 161 private void readObject(ObjectInputStream stream) 162 throws IOException, ClassNotFoundException { 163 stream.defaultReadObject(); 164 this.paint = SerialUtilities.readPaint(stream); 165 } 166 167 }