001 /* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jcommon/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 * ArrowPanel.java
029 * ---------------
030 * (C) Copyright 2002-2004, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: ArrowPanel.java,v 1.5 2005/11/16 15:58:41 taqua Exp $
036 *
037 * Changes
038 * -------
039 * 25-Sep-2002 : Version 1 (DG);
040 * 13-Oct-2002 : Added Javadocs (DG);
041 *
042 */
043
044 package org.jfree.ui;
045
046 import java.awt.Dimension;
047 import java.awt.Graphics;
048 import java.awt.Graphics2D;
049 import java.awt.Insets;
050 import java.awt.Polygon;
051 import java.awt.Shape;
052 import java.awt.geom.Rectangle2D;
053
054 import javax.swing.JPanel;
055
056 /**
057 * A basic panel that displays a small up or down arrow.
058 *
059 * @author David Gilbert
060 */
061 public class ArrowPanel extends JPanel {
062
063 /** A constant for the up arrow. */
064 public static final int UP = 0;
065
066 /** A constant for the down arrow. */
067 public static final int DOWN = 1;
068
069 /** The arrow type. */
070 private int type = UP;
071
072 /** The available area. */
073 private Rectangle2D available = new Rectangle2D.Float();
074
075 /**
076 * Creates a new arrow panel.
077 *
078 * @param type the arrow type.
079 */
080 public ArrowPanel(final int type) {
081 this.type = type;
082 setPreferredSize(new Dimension(14, 9));
083 }
084
085 /**
086 * Paints the arrow panel.
087 *
088 * @param g the graphics device for drawing on.
089 */
090 public void paintComponent(final Graphics g) {
091
092 super.paintComponent(g);
093 final Graphics2D g2 = (Graphics2D) g;
094
095 // first determine the size of the drawing area...
096 final Dimension size = getSize();
097 final Insets insets = getInsets();
098 this.available.setRect(insets.left, insets.top,
099 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 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 getUpArrow() {
127 final Polygon result = new Polygon();
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 getDownArrow() {
140 final Polygon result = new Polygon();
141 result.addPoint(7, 7);
142 result.addPoint(2, 2);
143 result.addPoint(12, 2);
144 return result;
145 }
146
147 }