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


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  * PointerNeedle.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: PointerNeedle.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  * 26-Mar-2003 : Implemented Serializable (DG);
41  * 09-Sep-2003 : Added equals() method (DG);
42  *
43  */
44
45 package org.jfree.chart.needle;
46
47 import java.awt.Graphics2D JavaDoc;
48 import java.awt.geom.GeneralPath JavaDoc;
49 import java.awt.geom.Point2D JavaDoc;
50 import java.awt.geom.Rectangle2D JavaDoc;
51
52 /**
53  * A needle in the shape of a pointer, for use with the
54  * {@link org.jfree.chart.plot.CompassPlot} class.
55  *
56  * @author Bryan Scott
57  */
58 public class PointerNeedle extends MeterNeedle {
59
60     /** For serialization. */
61     private static final long serialVersionUID = -4744677345334729606L;
62     
63     /**
64      * Draws the needle.
65      *
66      * @param g2 the graphics device.
67      * @param plotArea the plot area.
68      * @param rotate the rotation point.
69      * @param angle the angle.
70      */
71     protected void drawNeedle(Graphics2D JavaDoc g2, Rectangle2D JavaDoc plotArea,
72                               Point2D JavaDoc rotate, double angle) {
73
74         GeneralPath JavaDoc shape1 = new GeneralPath JavaDoc();
75         GeneralPath JavaDoc shape2 = new GeneralPath JavaDoc();
76         float minX = (float) plotArea.getMinX();
77         float minY = (float) plotArea.getMinY();
78         float maxX = (float) plotArea.getMaxX();
79         float maxY = (float) plotArea.getMaxY();
80         float midX = (float) (minX + (plotArea.getWidth() / 2));
81         float midY = (float) (minY + (plotArea.getHeight() / 2));
82
83         shape1.moveTo(minX, midY);
84         shape1.lineTo(midX, minY);
85         shape1.lineTo(maxX, midY);
86         shape1.closePath();
87
88         shape2.moveTo(minX, midY);
89         shape2.lineTo(midX, maxY);
90         shape2.lineTo(maxX, midY);
91         shape2.closePath();
92
93         if ((rotate != null) && (angle != 0)) {
94             /// we have rotation huston, please spin me
95 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
96             shape1.transform(getTransform());
97             shape2.transform(getTransform());
98         }
99
100         if (getFillPaint() != null) {
101             g2.setPaint(getFillPaint());
102             g2.fill(shape1);
103         }
104
105         if (getHighlightPaint() != null) {
106             g2.setPaint(getHighlightPaint());
107             g2.fill(shape2);
108         }
109
110         if (getOutlinePaint() != null) {
111             g2.setStroke(getOutlineStroke());
112             g2.setPaint(getOutlinePaint());
113             g2.draw(shape1);
114             g2.draw(shape2);
115         }
116     }
117
118     /**
119      * Tests another object for equality with this object.
120      *
121      * @param object the object to test.
122      *
123      * @return A boolean.
124      */
125     public boolean equals(Object JavaDoc object) {
126         if (object == null) {
127             return false;
128         }
129         if (object == this) {
130             return true;
131         }
132         if (super.equals(object) && object instanceof PointerNeedle) {
133             return true;
134         }
135         return false;
136     }
137
138 }
139
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