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 * ShipNeedle.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 * 27-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.Arc2D;
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 ship, for use with the
057 * {@link org.jfree.chart.plot.CompassPlot} class.
058 */
059 public class ShipNeedle extends MeterNeedle
060 implements Cloneable, Serializable {
061
062 /** For serialization. */
063 private static final long serialVersionUID = 149554868169435612L;
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 shape = new GeneralPath();
077 shape.append(new Arc2D.Double(-9.0, -7.0, 10, 14, 0.0, 25.5,
078 Arc2D.OPEN), true);
079 shape.append(new Arc2D.Double(0.0, -7.0, 10, 14, 154.5, 25.5,
080 Arc2D.OPEN), true);
081 shape.closePath();
082 getTransform().setToTranslation(plotArea.getMinX(), plotArea.getMaxY());
083 getTransform().scale(plotArea.getWidth(), plotArea.getHeight() / 3);
084 shape.transform(getTransform());
085
086 if ((rotate != null) && (angle != 0)) {
087 /// we have rotation
088 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
089 shape.transform(getTransform());
090 }
091
092 defaultDisplay(g2, shape);
093 }
094
095 /**
096 * Tests another object for equality with this object.
097 *
098 * @param object the object to test.
099 *
100 * @return A boolean.
101 */
102 public boolean equals(Object object) {
103 if (object == null) {
104 return false;
105 }
106 if (object == this) {
107 return true;
108 }
109 if (super.equals(object) && object instanceof ShipNeedle) {
110 return true;
111 }
112 return false;
113 }
114
115 /**
116 * Returns a hash code for this instance.
117 *
118 * @return A hash code.
119 */
120 public int hashCode() {
121 return super.hashCode();
122 }
123
124 /**
125 * Returns a clone of this needle.
126 *
127 * @return A clone.
128 *
129 * @throws CloneNotSupportedException if the <code>ShipNeedle</code>
130 * cannot be cloned (in theory, this should not happen).
131 */
132 public Object clone() throws CloneNotSupportedException {
133 return super.clone();
134 }
135
136 }
137