Source for org.jfree.chart.editor.PaletteSample

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   6:  *
   7:  * Project Info:  http://www.jfree.org/jfreechart/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  *
  27:  * ------------------
  28:  * PaletteSample.java
  29:  * ------------------
  30:  * (C) Copyright 2002-2004, by David M. O'Donnell.
  31:  *
  32:  * Original Author:  David M. O'Donnell;
  33:  * Contributor(s):   David Gilbert (for Object Refinery Limited);
  34:  *
  35:  * $Id: PaletteSample.java,v 1.1.2.1 2005/11/24 16:11:48 mungady Exp $
  36:  *
  37:  * Changes
  38:  * -------
  39:  * 21-Jan-2003 : Added standard header (DG);
  40:  *
  41:  */
  42: 
  43: package org.jfree.chart.editor;
  44: 
  45: import java.awt.BasicStroke;
  46: import java.awt.Component;
  47: import java.awt.Dimension;
  48: import java.awt.Graphics;
  49: import java.awt.Graphics2D;
  50: import java.awt.Insets;
  51: import java.awt.RenderingHints;
  52: import java.awt.geom.Line2D;
  53: 
  54: import javax.swing.JComponent;
  55: import javax.swing.JList;
  56: import javax.swing.ListCellRenderer;
  57: 
  58: import org.jfree.chart.plot.ColorPalette;
  59: 
  60: 
  61: /**
  62:  * A panel that displays a palette sample.
  63:  *
  64:  * @author David M. O'Donnell
  65:  */
  66: public class PaletteSample extends JComponent implements ListCellRenderer {
  67: 
  68:     /** The palette being displayed. */
  69:     private ColorPalette palette;
  70: 
  71:     /** The preferred size of the component; */
  72:     private Dimension preferredSize;
  73: 
  74:     /**
  75:      * Creates a new sample.
  76:      *
  77:      * @param palette  the palette.
  78:      */
  79:     public PaletteSample(ColorPalette palette) {
  80:         this.palette = palette;
  81:         this.preferredSize = new Dimension(80, 18);
  82:     }
  83: 
  84:     /**
  85:      * Returns a list cell renderer for the stroke, so the sample can be 
  86:      * displayed in a list or combo.
  87:      *
  88:      * @param list  the list component.
  89:      * @param value  the value.
  90:      * @param index  the index.
  91:      * @param isSelected  a flag that indicates whether or not the item is 
  92:      *                    selected.
  93:      * @param cellHasFocus  a flag that indicates whether or not the cell has 
  94:      *                      the focus.
  95:      *
  96:      * @return The renderer.
  97:      */
  98:     public Component getListCellRendererComponent(JList list, Object value, 
  99:                                                   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: }