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 * WindNeedle.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 * 09-Sep-2003 : Added equals() method (DG);
040 * 22-Nov-2007 : Implemented hashCode() (DG)
041 *
042 */
043
044 package org.jfree.chart.needle;
045
046 import java.awt.Graphics2D;
047 import java.awt.geom.Point2D;
048 import java.awt.geom.Rectangle2D;
049 import java.io.Serializable;
050
051 /**
052 * A needle that indicates wind direction, for use with the
053 * {@link org.jfree.chart.plot.CompassPlot} class.
054 */
055 public class WindNeedle extends ArrowNeedle
056 implements Cloneable, Serializable {
057
058 /** For serialization. */
059 private static final long serialVersionUID = -2861061368907167834L;
060
061 /**
062 * Default constructor.
063 */
064 public WindNeedle() {
065 super(false); // isArrowAtTop
066 }
067
068 /**
069 * Draws the needle.
070 *
071 * @param g2 the graphics device.
072 * @param plotArea the plot area.
073 * @param rotate the rotation point.
074 * @param angle the angle.
075 */
076 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
077 Point2D rotate, double angle) {
078
079 super.drawNeedle(g2, plotArea, rotate, angle);
080 if ((rotate != null) && (plotArea != null)) {
081
082 int spacing = getSize() * 3;
083 Rectangle2D newArea = new Rectangle2D.Double();
084
085 Point2D newRotate = rotate;
086 newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
087 plotArea.getWidth(), plotArea.getHeight());
088 super.drawNeedle(g2, newArea, newRotate, angle);
089
090 newArea.setRect(plotArea.getMinX() + spacing,
091 plotArea.getMinY(), plotArea.getWidth(),
092 plotArea.getHeight());
093 super.drawNeedle(g2, newArea, newRotate, angle);
094
095 }
096 }
097
098 /**
099 * Tests another object for equality with this object.
100 *
101 * @param object the object to test.
102 *
103 * @return A boolean.
104 */
105 public boolean equals(Object object) {
106 if (object == null) {
107 return false;
108 }
109 if (object == this) {
110 return true;
111 }
112 if (super.equals(object) && object instanceof WindNeedle) {
113 return true;
114 }
115 return false;
116 }
117
118 /**
119 * Returns a hash code for this instance.
120 *
121 * @return A hash code.
122 */
123 public int hashCode() {
124 return super.hashCode();
125 }
126
127 }
128