001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2006, 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 * PointerNeedle.java
029 * ------------------
030 * (C) Copyright 2002-2006, by the Australian Antarctic Division and
031 * Contributors.
032 *
033 * Original Author: Bryan Scott (for the Australian Antarctic Division);
034 * Contributor(s): David Gilbert (for Object Refinery Limited);
035 *
036 * $Id: PointerNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 mungady Exp $
037 *
038 * Changes:
039 * --------
040 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
041 * 26-Mar-2003 : Implemented Serializable (DG);
042 * 09-Sep-2003 : Added equals() method (DG);
043 * 08-Jun-2005 : Implemented Cloneable (DG);
044 *
045 */
046
047 package org.jfree.chart.needle;
048
049 import java.awt.Graphics2D;
050 import java.awt.geom.GeneralPath;
051 import java.awt.geom.Point2D;
052 import java.awt.geom.Rectangle2D;
053 import java.io.Serializable;
054
055 /**
056 * A needle in the shape of a pointer, for use with the
057 * {@link org.jfree.chart.plot.CompassPlot} class.
058 */
059 public class PointerNeedle extends MeterNeedle
060 implements Cloneable, Serializable {
061
062 /** For serialization. */
063 private static final long serialVersionUID = -4744677345334729606L;
064
065 /**
066 * Draws the needle.
067 *
068 * @param g2 the graphics device.
069 * @param plotArea the plot area.
070 * @param rotate the rotation point.
071 * @param angle the angle.
072 */
073 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074 Point2D rotate, double angle) {
075
076 GeneralPath shape1 = new GeneralPath();
077 GeneralPath shape2 = new GeneralPath();
078 float minX = (float) plotArea.getMinX();
079 float minY = (float) plotArea.getMinY();
080 float maxX = (float) plotArea.getMaxX();
081 float maxY = (float) plotArea.getMaxY();
082 float midX = (float) (minX + (plotArea.getWidth() / 2));
083 float midY = (float) (minY + (plotArea.getHeight() / 2));
084
085 shape1.moveTo(minX, midY);
086 shape1.lineTo(midX, minY);
087 shape1.lineTo(maxX, midY);
088 shape1.closePath();
089
090 shape2.moveTo(minX, midY);
091 shape2.lineTo(midX, maxY);
092 shape2.lineTo(maxX, midY);
093 shape2.closePath();
094
095 if ((rotate != null) && (angle != 0)) {
096 /// we have rotation huston, please spin me
097 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
098 shape1.transform(getTransform());
099 shape2.transform(getTransform());
100 }
101
102 if (getFillPaint() != null) {
103 g2.setPaint(getFillPaint());
104 g2.fill(shape1);
105 }
106
107 if (getHighlightPaint() != null) {
108 g2.setPaint(getHighlightPaint());
109 g2.fill(shape2);
110 }
111
112 if (getOutlinePaint() != null) {
113 g2.setStroke(getOutlineStroke());
114 g2.setPaint(getOutlinePaint());
115 g2.draw(shape1);
116 g2.draw(shape2);
117 }
118 }
119
120 /**
121 * Tests another object for equality with this object.
122 *
123 * @param obj the object to test (<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 PointerNeedle)) {
132 return false;
133 }
134 if (!super.equals(obj)) {
135 return false;
136 }
137 return true;
138 }
139
140 /**
141 * Returns a clone of this needle.
142 *
143 * @return A clone.
144 *
145 * @throws CloneNotSupportedException if the <code>PointerNeedle</code>
146 * cannot be cloned (in theory, this should not happen).
147 */
148 public Object clone() throws CloneNotSupportedException {
149 return super.clone();
150 }
151
152 }