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 1.6 2007/11/02 17:50:36 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 import javax.swing.JPanel;
054
055 /**
056 * A basic panel that displays a small up or down arrow.
057 *
058 * @author David Gilbert
059 */
060 public class ArrowPanel extends JPanel {
061
062 /** A constant for the up arrow. */
063 public static final int UP = 0;
064
065 /** A constant for the down arrow. */
066 public static final int DOWN = 1;
067
068 /** The arrow type. */
069 private int type = UP;
070
071 /** The available area. */
072 private Rectangle2D available = new Rectangle2D.Float();
073
074 /**
075 * Creates a new arrow panel.
076 *
077 * @param type the arrow type.
078 */
079 public ArrowPanel(final int type) {
080 this.type = type;
081 setPreferredSize(new Dimension(14, 9));
082 }
083
084 /**
085 * Paints the arrow panel.
086 *
087 * @param g the graphics device for drawing on.
088 */
089 public void paintComponent(final Graphics g) {
090
091 super.paintComponent(g);
092 final Graphics2D g2 = (Graphics2D) g;
093
094 // first determine the size of the drawing area...
095 final Dimension size = getSize();
096 final Insets insets = getInsets();
097 this.available.setRect(insets.left, insets.top,
098 size.getWidth() - insets.left - insets.right,
099 size.getHeight() - insets.top - insets.bottom);
100 g2.translate(insets.left, insets.top);
101 g2.fill(getArrow(this.type));
102
103 }
104
105 /**
106 * Returns a shape for the arrow.
107 *
108 * @param t the arrow type.
109 *
110 * @return the arrow shape.
111 */
112 private Shape getArrow(final int t) {
113 switch (t) {
114 case UP : return getUpArrow();
115 case DOWN : return getDownArrow();
116 default : return getUpArrow();
117 }
118 }
119
120 /**
121 * Returns an up arrow.
122 *
123 * @return an up arrow.
124 */
125 private Shape getUpArrow() {
126 final Polygon result = new Polygon();
127 result.addPoint(7, 2);
128 result.addPoint(2, 7);
129 result.addPoint(12, 7);
130 return result;
131 }
132
133 /**
134 * Returns a down arrow.
135 *
136 * @return a down arrow.
137 */
138 private Shape getDownArrow() {
139 final Polygon result = new Polygon();
140 result.addPoint(7, 7);
141 result.addPoint(2, 2);
142 result.addPoint(12, 2);
143 return result;
144 }
145
146 }