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Java > Open Source Codes > org > jfree > chart > needle > WindNeedle


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public License
20  * along with this library; if not, write to the Free Software Foundation,
21  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
24  * in the United States and other countries.]
25  *
26  * ---------------
27  * WindNeedle.java
28  * ---------------
29  * (C) Copyright 2002-2005, by the Australian Antarctic Division and
30  * Contributors.
31  *
32  * Original Author: Bryan Scott (for the Australian Antarctic Division);
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: WindNeedle.java,v 1.4 2005/05/19 15:42:54 mungady Exp $
36  *
37  * Changes:
38  * --------
39  * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
40  * 09-Sep-2003 : Added equals() method (DG);
41  *
42  */
43
44 package org.jfree.chart.needle;
45
46 import java.awt.Graphics2D JavaDoc;
47 import java.awt.geom.Point2D JavaDoc;
48 import java.awt.geom.Rectangle2D JavaDoc;
49 import java.io.Serializable JavaDoc;
50
51 /**
52  * A needle that indicates wind direction, for use with the
53  * {@link org.jfree.chart.plot.CompassPlot} class.
54  *
55  * @author Bryan Scott
56  */
57 public class WindNeedle extends ArrowNeedle implements Serializable JavaDoc {
58
59     /** For serialization. */
60     private static final long serialVersionUID = -2861061368907167834L;
61     
62     /**
63      * Default constructor.
64      */
65     public WindNeedle() {
66         super(false); // isArrowAtTop
67 }
68
69     /**
70      * Draws the needle.
71      *
72      * @param g2 the graphics device.
73      * @param plotArea the plot area.
74      * @param rotate the rotation point.
75      * @param angle the angle.
76      */
77     protected void drawNeedle(Graphics2D JavaDoc g2, Rectangle2D JavaDoc plotArea,
78                               Point2D JavaDoc rotate, double angle) {
79
80         super.drawNeedle(g2, plotArea, rotate, angle);
81         if ((rotate != null) && (plotArea != null)) {
82
83             int spacing = getSize() * 3;
84             Rectangle2D JavaDoc newArea = new Rectangle2D.Double JavaDoc();
85
86             Point2D JavaDoc newRotate = rotate;
87             newArea.setRect(
88                 plotArea.getMinX() - spacing, plotArea.getMinY(),
89                 plotArea.getWidth(), plotArea.getHeight()
90             );
91             super.drawNeedle(g2, newArea, newRotate, angle);
92
93             newArea.setRect(
94                 plotArea.getMinX() + spacing, plotArea.getMinY(),
95                 plotArea.getWidth(), plotArea.getHeight()
96             );
97             super.drawNeedle(g2, newArea, newRotate, angle);
98
99         }
100     }
101
102     /**
103      * Tests another object for equality with this object.
104      *
105      * @param object the object to test.
106      *
107      * @return A boolean.
108      */
109     public boolean equals(Object JavaDoc object) {
110         if (object == null) {
111             return false;
112         }
113         if (object == this) {
114             return true;
115         }
116         if (super.equals(object) && object instanceof WindNeedle) {
117             return true;
118         }
119         return false;
120     }
121
122 }
123
124
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