import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RadialGradientPaint;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/*
 * HighlightedButton.java
 *
 * Created on May 1, 2007, 3:45 PM
 *
 * Copyright (c) 2007, Sun Microsystems, Inc
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 *
 * @author Chet
 */
public class HighlightedButton extends JButton {
    
    static final int HIGHLIGHT_SIZE = 18;
    BufferedImage highlight = new BufferedImage(
            HIGHLIGHT_SIZE, HIGHLIGHT_SIZE, BufferedImage.TYPE_INT_ARGB);
    
    /**
     * Creates a new instance of HighlightedButton
     */
    public HighlightedButton(String label) {
        super(label);
        
        // Get the Graphics for the image
        Graphics2D g2d = highlight.createGraphics();
        
        // Erase the image with a transparent background
        g2d.setComposite(AlphaComposite.Clear);
        g2d.fillRect(0, 0, HIGHLIGHT_SIZE, HIGHLIGHT_SIZE);
        g2d.setComposite(AlphaComposite.SrcOver);
        
        // Draw the highlight
        Point2D center = new Point2D.Float((float)HIGHLIGHT_SIZE / 2.0f,
                (float)HIGHLIGHT_SIZE / 2.0f);
        float radius = (float)HIGHLIGHT_SIZE / 2.0f;
        float[] dist = {0.0f, .85f};
        Color[] colors = {Color.white, new Color(255, 255, 255, 0)};
        RadialGradientPaint paint = new RadialGradientPaint(center, radius,
                dist, colors);
        g2d.setPaint(paint);
        g2d.fillOval(0, 0, HIGHLIGHT_SIZE, HIGHLIGHT_SIZE);
        g2d.dispose();
    }
    
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(highlight, getWidth()/4, getHeight()/4, null);
    }
    
    private static void createAndShowGUI() {    
        JFrame f = new JFrame();
        f.getContentPane().setLayout(new FlowLayout());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(100, 100);
        f.add(new JButton("Standard"));
        f.add(new HighlightedButton("Highlighted"));
        f.setVisible(true);
    }
    
    public static void main(String args[]) {
        Runnable doCreateAndShowGUI = new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        };
        SwingUtilities.invokeLater(doCreateAndShowGUI);
    }
    
}