001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2002-2008, 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 * Changes:
037 * --------
038 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
039 * 26-Mar-2003 : Implemented Serializable (DG);
040 * 09-Sep-2003 : Added equals() method (DG);
041 * 08-Jun-2005 : Implemented Cloneable (DG);
042 * 22-Nov-2007 : Implemented hashCode() (DG);
043 *
044 */
045
046 package org.jfree.chart.needle;
047
048 import java.awt.Graphics2D;
049 import java.awt.geom.GeneralPath;
050 import java.awt.geom.Point2D;
051 import java.awt.geom.Rectangle2D;
052 import java.io.Serializable;
053
054 /**
055 * A needle in the shape of a pointer, for use with the
056 * {@link org.jfree.chart.plot.CompassPlot} class.
057 */
058 public class PointerNeedle extends MeterNeedle
059 implements Cloneable, Serializable {
060
061 /** For serialization. */
062 private static final long serialVersionUID = -4744677345334729606L;
063
064 /**
065 * Draws the needle.
066 *
067 * @param g2 the graphics device.
068 * @param plotArea the plot area.
069 * @param rotate the rotation point.
070 * @param angle the angle.
071 */
072 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
073 Point2D rotate, double angle) {
074
075 GeneralPath shape1 = new GeneralPath();
076 GeneralPath shape2 = new GeneralPath();
077 float minX = (float) plotArea.getMinX();
078 float minY = (float) plotArea.getMinY();
079 float maxX = (float) plotArea.getMaxX();
080 float maxY = (float) plotArea.getMaxY();
081 float midX = (float) (minX + (plotArea.getWidth() / 2));
082 float midY = (float) (minY + (plotArea.getHeight() / 2));
083
084 shape1.moveTo(minX, midY);
085 shape1.lineTo(midX, minY);
086 shape1.lineTo(maxX, midY);
087 shape1.closePath();
088
089 shape2.moveTo(minX, midY);
090 shape2.lineTo(midX, maxY);
091 shape2.lineTo(maxX, midY);
092 shape2.closePath();
093
094 if ((rotate != null) && (angle != 0)) {
095 /// we have rotation huston, please spin me
096 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
097 shape1.transform(getTransform());
098 shape2.transform(getTransform());
099 }
100
101 if (getFillPaint() != null) {
102 g2.setPaint(getFillPaint());
103 g2.fill(shape1);
104 }
105
106 if (getHighlightPaint() != null) {
107 g2.setPaint(getHighlightPaint());
108 g2.fill(shape2);
109 }
110
111 if (getOutlinePaint() != null) {
112 g2.setStroke(getOutlineStroke());
113 g2.setPaint(getOutlinePaint());
114 g2.draw(shape1);
115 g2.draw(shape2);
116 }
117 }
118
119 /**
120 * Tests another object for equality with this object.
121 *
122 * @param obj the object to test (<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 PointerNeedle)) {
131 return false;
132 }
133 if (!super.equals(obj)) {
134 return false;
135 }
136 return true;
137 }
138
139 /**
140 * Returns a hash code for this instance.
141 *
142 * @return A hash code.
143 */
144 public int hashCode() {
145 return super.hashCode();
146 }
147
148 /**
149 * Returns a clone of this needle.
150 *
151 * @return A clone.
152 *
153 * @throws CloneNotSupportedException if the <code>PointerNeedle</code>
154 * cannot be cloned (in theory, this should not happen).
155 */
156 public Object clone() throws CloneNotSupportedException {
157 return super.clone();
158 }
159
160 }