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: * $Id: ColorBlock.java,v 1.4.2.2 2007/03/16 15:26:15 mungady Exp $
036: *
037: * Changes:
038: * --------
039: * 22-Oct-2004 : Version 1 (DG);
040: * 20-Apr-2005 : Added new draw() method (DG);
041: * ------------- JFREECHART 1.0.x ---------------------------------------------
042: * 16-Mar-2007 : Implemented equals() and fixed serialization (DG);
043: *
044: */
045:
046: package org.jfree.chart.block;
047:
048: import java.awt.Graphics2D;
049: import java.awt.Paint;
050: import java.awt.geom.Rectangle2D;
051: import java.io.IOException;
052: import java.io.ObjectInputStream;
053: import java.io.ObjectOutputStream;
054:
055: import org.jfree.io.SerialUtilities;
056: import org.jfree.util.PaintUtilities;
057:
058: /**
059: * A block that is filled with a single color.
060: */
061: public class ColorBlock extends AbstractBlock implements Block {
062:
063: /** The paint. */
064: private transient Paint paint;
065:
066: /**
067: * Creates a new block.
068: *
069: * @param paint the paint (<code>null</code> not permitted).
070: * @param width the width.
071: * @param height the height.
072: */
073: public ColorBlock(Paint paint, double width, double height) {
074: if (paint == null) {
075: throw new IllegalArgumentException("Null 'paint' argument.");
076: }
077: this .paint = paint;
078: setWidth(width);
079: setHeight(height);
080: }
081:
082: /**
083: * Returns the paint.
084: *
085: * @return The paint (never <code>null</code>).
086: *
087: * @since 1.0.5
088: */
089: public Paint getPaint() {
090: return this .paint;
091: }
092:
093: /**
094: * Draws the block.
095: *
096: * @param g2 the graphics device.
097: * @param area the area.
098: */
099: public void draw(Graphics2D g2, Rectangle2D area) {
100: Rectangle2D bounds = getBounds();
101: g2.setPaint(this .paint);
102: g2.fill(bounds);
103: }
104:
105: /**
106: * Draws the block within the specified area.
107: *
108: * @param g2 the graphics device.
109: * @param area the area.
110: * @param params ignored (<code>null</code> permitted).
111: *
112: * @return Always <code>null</code>.
113: */
114: public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
115: draw(g2, area);
116: return null;
117: }
118:
119: /**
120: * Tests this block for equality with an arbitrary object.
121: *
122: * @param obj the object (<code>null</code> permitted).
123: *
124: * @return A boolean.
125: */
126: public boolean equals(Object obj) {
127: if (obj == this ) {
128: return true;
129: }
130: if (!(obj instanceof ColorBlock)) {
131: return false;
132: }
133: ColorBlock that = (ColorBlock) obj;
134: if (!PaintUtilities.equal(this .paint, that.paint)) {
135: return false;
136: }
137: return super .equals(obj);
138: }
139:
140: /**
141: * Provides serialization support.
142: *
143: * @param stream the output stream.
144: *
145: * @throws IOException if there is an I/O error.
146: */
147: private void writeObject(ObjectOutputStream stream)
148: 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: }
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