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 * StrokeSample.java
029 * -----------------
030 * (C) Copyright 2000-2004, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: StrokeSample.java,v 1.4 2007/11/02 17:50:36 taqua Exp $
036 *
037 * Changes (from 26-Oct-2001)
038 * --------------------------
039 * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
040 * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
041 * 21-Mar-2003 : Fixed null pointer exception, bug 705126 (DG);
042 *
043 */
044
045 package org.jfree.ui;
046
047 import java.awt.BasicStroke;
048 import java.awt.Component;
049 import java.awt.Dimension;
050 import java.awt.Graphics;
051 import java.awt.Graphics2D;
052 import java.awt.Insets;
053 import java.awt.RenderingHints;
054 import java.awt.Stroke;
055 import java.awt.geom.Ellipse2D;
056 import java.awt.geom.Line2D;
057 import java.awt.geom.Point2D;
058 import javax.swing.JComponent;
059 import javax.swing.JList;
060 import javax.swing.ListCellRenderer;
061
062 /**
063 * A panel that displays a stroke sample.
064 *
065 * @author David Gilbert
066 */
067 public class StrokeSample extends JComponent implements ListCellRenderer {
068
069 /** The stroke being displayed. */
070 private Stroke stroke;
071
072 /** The preferred size of the component. */
073 private Dimension preferredSize;
074
075 /**
076 * Creates a StrokeSample for the specified stroke.
077 *
078 * @param stroke the sample stroke.
079 */
080 public StrokeSample(final Stroke stroke) {
081 this.stroke = stroke;
082 this.preferredSize = new Dimension(80, 18);
083 }
084
085 /**
086 * Returns the current Stroke object being displayed.
087 *
088 * @return the stroke.
089 */
090 public Stroke getStroke() {
091 return this.stroke;
092 }
093
094 /**
095 * Sets the Stroke object being displayed.
096 *
097 * @param stroke the stroke.
098 */
099 public void setStroke(final Stroke stroke) {
100 this.stroke = stroke;
101 repaint();
102 }
103
104 /**
105 * Returns the preferred size of the component.
106 *
107 * @return the preferred size of the component.
108 */
109 public Dimension getPreferredSize() {
110 return this.preferredSize;
111 }
112
113 /**
114 * Draws a line using the sample stroke.
115 *
116 * @param g the graphics device.
117 */
118 public void paintComponent(final Graphics g) {
119
120 final Graphics2D g2 = (Graphics2D) g;
121 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
122 final Dimension size = getSize();
123 final Insets insets = getInsets();
124 final double xx = insets.left;
125 final double yy = insets.top;
126 final double ww = size.getWidth() - insets.left - insets.right;
127 final double hh = size.getHeight() - insets.top - insets.bottom;
128
129 // calculate point one
130 final Point2D one = new Point2D.Double(xx + 6, yy + hh / 2);
131 // calculate point two
132 final Point2D two = new Point2D.Double(xx + ww - 6, yy + hh / 2);
133 // draw a circle at point one
134 final Ellipse2D circle1 = new Ellipse2D.Double(one.getX() - 5, one.getY() - 5, 10, 10);
135 final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6, two.getY() - 5, 10, 10);
136
137 // draw a circle at point two
138 g2.draw(circle1);
139 g2.fill(circle1);
140 g2.draw(circle2);
141 g2.fill(circle2);
142
143 // draw a line connecting the points
144 final Line2D line = new Line2D.Double(one, two);
145 if (this.stroke != null) {
146 g2.setStroke(this.stroke);
147 }
148 else {
149 g2.setStroke(new BasicStroke(0.0f));
150 }
151 g2.draw(line);
152
153 }
154
155 /**
156 * Returns a list cell renderer for the stroke, so the sample can be displayed in a list or
157 * combo.
158 *
159 * @param list the list.
160 * @param value the value.
161 * @param index the index.
162 * @param isSelected selected?
163 * @param cellHasFocus focussed?
164 *
165 * @return the component for rendering.
166 */
167 public Component getListCellRendererComponent(final JList list, final Object value, final int index,
168 final boolean isSelected, final boolean cellHasFocus) {
169 if (value instanceof StrokeSample) {
170 final StrokeSample in = (StrokeSample) value;
171 setStroke(in.getStroke());
172 }
173 return this;
174 }
175
176 }