001    /* ===========================================================
002     * JFreeChart : a free chart 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/jfreechart/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     * PaletteSample.java
029     * ------------------
030     * (C) Copyright 2002-2004, by David M. O'Donnell.
031     *
032     * Original Author:  David M. O'Donnell;
033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
034     *
035     * $Id: PaletteSample.java,v 1.1.2.1 2005/11/24 16:11:48 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 21-Jan-2003 : Added standard header (DG);
040     *
041     */
042    
043    package org.jfree.chart.editor;
044    
045    import java.awt.BasicStroke;
046    import java.awt.Component;
047    import java.awt.Dimension;
048    import java.awt.Graphics;
049    import java.awt.Graphics2D;
050    import java.awt.Insets;
051    import java.awt.RenderingHints;
052    import java.awt.geom.Line2D;
053    
054    import javax.swing.JComponent;
055    import javax.swing.JList;
056    import javax.swing.ListCellRenderer;
057    
058    import org.jfree.chart.plot.ColorPalette;
059    
060    
061    /**
062     * A panel that displays a palette sample.
063     *
064     * @author David M. O'Donnell
065     */
066    public class PaletteSample extends JComponent implements ListCellRenderer {
067    
068        /** The palette being displayed. */
069        private ColorPalette palette;
070    
071        /** The preferred size of the component; */
072        private Dimension preferredSize;
073    
074        /**
075         * Creates a new sample.
076         *
077         * @param palette  the palette.
078         */
079        public PaletteSample(ColorPalette palette) {
080            this.palette = palette;
081            this.preferredSize = new Dimension(80, 18);
082        }
083    
084        /**
085         * Returns a list cell renderer for the stroke, so the sample can be 
086         * displayed in a list or combo.
087         *
088         * @param list  the list component.
089         * @param value  the value.
090         * @param index  the index.
091         * @param isSelected  a flag that indicates whether or not the item is 
092         *                    selected.
093         * @param cellHasFocus  a flag that indicates whether or not the cell has 
094         *                      the focus.
095         *
096         * @return The renderer.
097         */
098        public Component getListCellRendererComponent(JList list, Object value, 
099                                                      int index,
100                                                      boolean isSelected, 
101                                                      boolean cellHasFocus) {
102            if (value instanceof PaletteSample) {
103                PaletteSample in = (PaletteSample) value;
104                setPalette(in.getPalette());
105            }
106            return this;
107        }
108    
109        /**
110         * Returns the current palette object being displayed.
111         *
112         * @return The palette.
113         */
114        public ColorPalette getPalette() {
115            return this.palette;
116        }
117    
118        /**
119         * Returns the preferred size of the component.
120         *
121         * @return The preferred size.
122         */
123        public Dimension getPreferredSize() {
124            return this.preferredSize;
125        }
126    
127        /**
128         * Draws the sample.
129         *
130         * @param g  the graphics device.
131         */
132        public void paintComponent(Graphics g) {
133    
134            Graphics2D g2 = (Graphics2D) g;
135            g2.setRenderingHint(
136                RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF
137            );
138            Dimension size = getSize();
139            Insets insets = getInsets();
140            double ww = size.getWidth() - insets.left - insets.right;
141            double hh = size.getHeight() - insets.top - insets.bottom;
142    
143            g2.setStroke(new BasicStroke(1.0f));
144    
145            double y1 = insets.top;
146            double y2 = y1 + hh;
147            double xx = insets.left;
148            Line2D line = new Line2D.Double();
149            int count = 0;
150            while (xx <= insets.left + ww) {
151                count++;
152                line.setLine(xx, y1, xx, y2);
153                g2.setPaint(this.palette.getColor(count));
154                g2.draw(line);
155                xx += 1;
156            }
157        }
158    
159        /**
160         * Sets the palette object being displayed.
161         *
162         * @param palette  the palette.
163         */
164        public void setPalette(ColorPalette palette) {
165            this.palette = palette;
166            this.repaint();
167        }
168    
169    }