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    }