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 1.3 2005/10/18 13:18:34 mungady 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
059 import javax.swing.JComponent;
060 import javax.swing.JList;
061 import javax.swing.ListCellRenderer;
062
063 /**
064 * A panel that displays a stroke sample.
065 *
066 * @author David Gilbert
067 */
068 public class StrokeSample extends JComponent implements ListCellRenderer {
069
070 /** The stroke being displayed. */
071 private Stroke stroke;
072
073 /** The preferred size of the component. */
074 private Dimension preferredSize;
075
076 /**
077 * Creates a StrokeSample for the specified stroke.
078 *
079 * @param stroke the sample stroke.
080 */
081 public StrokeSample(final Stroke stroke) {
082 this.stroke = stroke;
083 this.preferredSize = new Dimension(80, 18);
084 }
085
086 /**
087 * Returns the current Stroke object being displayed.
088 *
089 * @return the stroke.
090 */
091 public Stroke getStroke() {
092 return this.stroke;
093 }
094
095 /**
096 * Sets the Stroke object being displayed.
097 *
098 * @param stroke the stroke.
099 */
100 public void setStroke(final Stroke stroke) {
101 this.stroke = stroke;
102 repaint();
103 }
104
105 /**
106 * Returns the preferred size of the component.
107 *
108 * @return the preferred size of the component.
109 */
110 public Dimension getPreferredSize() {
111 return this.preferredSize;
112 }
113
114 /**
115 * Draws a line using the sample stroke.
116 *
117 * @param g the graphics device.
118 */
119 public void paintComponent(final Graphics g) {
120
121 final Graphics2D g2 = (Graphics2D) g;
122 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
123 final Dimension size = getSize();
124 final Insets insets = getInsets();
125 final double xx = insets.left;
126 final double yy = insets.top;
127 final double ww = size.getWidth() - insets.left - insets.right;
128 final double hh = size.getHeight() - insets.top - insets.bottom;
129
130 // calculate point one
131 final Point2D one = new Point2D.Double(xx + 6, yy + hh / 2);
132 // calculate point two
133 final Point2D two = new Point2D.Double(xx + ww - 6, yy + hh / 2);
134 // draw a circle at point one
135 final Ellipse2D circle1 = new Ellipse2D.Double(one.getX() - 5, one.getY() - 5, 10, 10);
136 final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6, two.getY() - 5, 10, 10);
137
138 // draw a circle at point two
139 g2.draw(circle1);
140 g2.fill(circle1);
141 g2.draw(circle2);
142 g2.fill(circle2);
143
144 // draw a line connecting the points
145 final Line2D line = new Line2D.Double(one, two);
146 if (this.stroke != null) {
147 g2.setStroke(this.stroke);
148 }
149 else {
150 g2.setStroke(new BasicStroke(0.0f));
151 }
152 g2.draw(line);
153
154 }
155
156 /**
157 * Returns a list cell renderer for the stroke, so the sample can be displayed in a list or
158 * combo.
159 *
160 * @param list the list.
161 * @param value the value.
162 * @param index the index.
163 * @param isSelected selected?
164 * @param cellHasFocus focussed?
165 *
166 * @return the component for rendering.
167 */
168 public Component getListCellRendererComponent(final JList list, final Object value, final int index,
169 final boolean isSelected, final boolean cellHasFocus) {
170 if (value instanceof StrokeSample) {
171 final StrokeSample in = (StrokeSample) value;
172 setStroke(in.getStroke());
173 }
174 return this;
175 }
176
177 }