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Java > Open Source Codes > org > jfree > ui > ArrowPanel


1 /* ========================================================================
2  * JCommon : a free general purpose class 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/jcommon/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
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------
28  * ArrowPanel.java
29  * ---------------
30  * (C) Copyright 2002-2004, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: ArrowPanel.java,v 1.5 2005/11/16 15:58:41 taqua Exp $
36  *
37  * Changes
38  * -------
39  * 25-Sep-2002 : Version 1 (DG);
40  * 13-Oct-2002 : Added Javadocs (DG);
41  *
42  */
43
44 package org.jfree.ui;
45
46 import java.awt.Dimension JavaDoc;
47 import java.awt.Graphics JavaDoc;
48 import java.awt.Graphics2D JavaDoc;
49 import java.awt.Insets JavaDoc;
50 import java.awt.Polygon JavaDoc;
51 import java.awt.Shape JavaDoc;
52 import java.awt.geom.Rectangle2D JavaDoc;
53
54 import javax.swing.JPanel JavaDoc;
55
56 /**
57  * A basic panel that displays a small up or down arrow.
58  *
59  * @author David Gilbert
60  */
61 public class ArrowPanel extends JPanel JavaDoc {
62
63     /** A constant for the up arrow. */
64     public static final int UP = 0;
65
66     /** A constant for the down arrow. */
67     public static final int DOWN = 1;
68
69     /** The arrow type. */
70     private int type = UP;
71
72     /** The available area. */
73     private Rectangle2D JavaDoc available = new Rectangle2D.Float JavaDoc();
74
75     /**
76      * Creates a new arrow panel.
77      *
78      * @param type the arrow type.
79      */
80     public ArrowPanel(final int type) {
81         this.type = type;
82         setPreferredSize(new Dimension JavaDoc(14, 9));
83     }
84
85     /**
86      * Paints the arrow panel.
87      *
88      * @param g the graphics device for drawing on.
89      */
90     public void paintComponent(final Graphics JavaDoc g) {
91
92         super.paintComponent(g);
93         final Graphics2D JavaDoc g2 = (Graphics2D JavaDoc) g;
94
95         // first determine the size of the drawing area...
96 final Dimension JavaDoc size = getSize();
97         final Insets JavaDoc insets = getInsets();
98         this.available.setRect(insets.left, insets.top,
99                                size.getWidth() - insets.left - insets.right,
100                                size.getHeight() - insets.top - insets.bottom);
101         g2.translate(insets.left, insets.top);
102         g2.fill(getArrow(this.type));
103
104     }
105
106     /**
107      * Returns a shape for the arrow.
108      *
109      * @param t the arrow type.
110      *
111      * @return the arrow shape.
112      */
113     private Shape JavaDoc getArrow(final int t) {
114         switch (t) {
115             case UP : return getUpArrow();
116             case DOWN : return getDownArrow();
117             default : return getUpArrow();
118         }
119     }
120
121     /**
122      * Returns an up arrow.
123      *
124      * @return an up arrow.
125      */
126     private Shape JavaDoc getUpArrow() {
127         final Polygon JavaDoc result = new Polygon JavaDoc();
128         result.addPoint(7, 2);
129         result.addPoint(2, 7);
130         result.addPoint(12, 7);
131         return result;
132     }
133
134     /**
135      * Returns a down arrow.
136      *
137      * @return a down arrow.
138      */
139     private Shape JavaDoc getDownArrow() {
140         final Polygon JavaDoc result = new Polygon JavaDoc();
141         result.addPoint(7, 7);
142         result.addPoint(2, 2);
143         result.addPoint(12, 2);
144         return result;
145     }
146
147 }
148
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