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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jcommon/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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -----------------
 * StrokeSample.java
 * -----------------
 * (C) Copyright 2000-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: StrokeSample.java,v 1.5 2009/02/27 13:58:41 mungady Exp $
 *
 * Changes (from 26-Oct-2001)
 * --------------------------
 * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
 * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 21-Mar-2003 : Fixed null pointer exception, bug 705126 (DG);
 *
 */

package org.jfree.ui;

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.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.ListCellRenderer;

/**
 * A panel that displays a stroke sample.
 *
 * @author David Gilbert
 */
public class StrokeSample extends JComponent implements ListCellRenderer {

    /** The stroke being displayed (may be null). */
    private Stroke stroke;

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

    /**
     * Creates a StrokeSample for the specified stroke.
     *
     * @param stroke  the sample stroke (null permitted).
     */
    public StrokeSample(final Stroke stroke) {
        this.stroke = stroke;
        this.preferredSize = new Dimension(80, 18);
        setPreferredSize(this.preferredSize);
    }

    /**
     * Returns the current Stroke object being displayed.
     *
     * @return The stroke (possibly null).
     */
    public Stroke getStroke() {
        return this.stroke;
    }

    /**
     * Sets the stroke object being displayed and repaints the component.
     *
     * @param stroke  the stroke (null permitted).
     */
    public void setStroke(final Stroke stroke) {
        this.stroke = stroke;
        repaint();
    }

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

    /**
     * Draws a line using the sample stroke.
     *
     * @param g  the graphics device.
     */
    public void paintComponent(final Graphics g) {

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

        // calculate point one
        final Point2D one =  new Point2D.Double(xx + 6, yy + hh / 2);
        // calculate point two
        final Point2D two =  new Point2D.Double(xx + ww - 6, yy + hh / 2);
        // draw a circle at point one
        final Ellipse2D circle1 = new Ellipse2D.Double(one.getX() - 5,
                one.getY() - 5, 10, 10);
        final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6,
                two.getY() - 5, 10, 10);

        // draw a circle at point two
        g2.draw(circle1);
        g2.fill(circle1);
        g2.draw(circle2);
        g2.fill(circle2);

        // draw a line connecting the points
        final Line2D line = new Line2D.Double(one, two);
        if (this.stroke != null) {
            g2.setStroke(this.stroke);
            g2.draw(line);
        }

    }

    /**
     * Returns a list cell renderer for the stroke, so the sample can be
     * displayed in a list or combo.
     *
     * @param list  the list.
     * @param value  the value.
     * @param index  the index.
     * @param isSelected  selected?
     * @param cellHasFocus  focussed?
     *
     * @return the component for rendering.
     */
    public Component getListCellRendererComponent(JList list, Object value,
            int index, boolean isSelected, boolean cellHasFocus) {
        if (value instanceof Stroke) {
            setStroke((Stroke) value);
        }
        else {
            setStroke(null);
        }
        return this;
    }

}