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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ------------------
 * PaletteSample.java
 * ------------------
 * (C) Copyright 2002-2008, by David M. O'Donnell.
 *
 * Original Author:  David M. O'Donnell;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 21-Jan-2003 : Added standard header (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 31-Jan-2007 : Deprecated (DG);
 *
 */

package org.jfree.chart.editor;

import java.awt.BasicStroke;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;

import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.ListCellRenderer;

import org.jfree.chart.plot.ColorPalette;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBlockRenderer;


/**
 * A panel that displays a palette sample.
 *
 * @deprecated This class is no longer supported (as of version 1.0.4).  If
 *     you are creating contour plots, please try to use {@link XYPlot} and
 *     {@link XYBlockRenderer}.
 */
public class PaletteSample extends JComponent implements ListCellRenderer {

    /** The palette being displayed. */
    private ColorPalette palette;

    /** The preferred size of the component; */
    private Dimension preferredSize;

    /**
     * Creates a new sample.
     *
     * @param palette  the palette.
     */
    public PaletteSample(ColorPalette palette) {
        this.palette = palette;
        this.preferredSize = new Dimension(80, 18);
    }

    /**
     * Returns a list cell renderer for the stroke, so the sample can be
     * displayed in a list or combo.
     *
     * @param list  the list component.
     * @param value  the value.
     * @param index  the index.
     * @param isSelected  a flag that indicates whether or not the item is
     *                    selected.
     * @param cellHasFocus  a flag that indicates whether or not the cell has
     *                      the focus.
     *
     * @return The renderer.
     */
    @Override
    public Component getListCellRendererComponent(JList list, Object value,
            int index, boolean isSelected, boolean cellHasFocus) {
        if (value instanceof PaletteSample) {
            PaletteSample in = (PaletteSample) value;
            setPalette(in.getPalette());
        }
        return this;
    }

    /**
     * Returns the current palette object being displayed.
     *
     * @return The palette.
     */
    public ColorPalette getPalette() {
        return this.palette;
    }

    /**
     * Returns the preferred size of the component.
     *
     * @return The preferred size.
     */
    @Override
    public Dimension getPreferredSize() {
        return this.preferredSize;
    }

    /**
     * Draws the sample.
     *
     * @param g  the graphics device.
     */
    @Override
    public void paintComponent(Graphics g) {

        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                RenderingHints.VALUE_ANTIALIAS_OFF);
        Dimension size = getSize();
        Insets insets = getInsets();
        double ww = size.getWidth() - insets.left - insets.right;
        double hh = size.getHeight() - insets.top - insets.bottom;

        g2.setStroke(new BasicStroke(1.0f));

        double y1 = insets.top;
        double y2 = y1 + hh;
        double xx = insets.left;
        Line2D line = new Line2D.Double();
        int count = 0;
        while (xx <= insets.left + ww) {
            count++;
            line.setLine(xx, y1, xx, y2);
            g2.setPaint(this.palette.getColor(count));
            g2.draw(line);
            xx += 1;
        }
    }

    /**
     * Sets the palette object being displayed.
     *
     * @param palette  the palette.
     */
    public void setPalette(ColorPalette palette) {
        this.palette = palette;
        this.repaint();
    }

}