package com.softwarematch.workflow;import java.awt.Color;import java.awt.Component;import java.awt.Graphics;import java.awt.Insets;import java.io.Serializable;import javax.swing.border.Border;/** * Example of a shadowed border */public class JGraphShadowBorder implements Border, Serializable {	/**	 * Inset for groups	 */	protected Insets insets;	/**	 * Shared class instance	 */	public static JGraphShadowBorder sharedInstance = new JGraphShadowBorder();	/**	 * Creates a new shadow border with default dimensions	 *	 */	private JGraphShadowBorder() {		insets = new Insets(1, 1, 3, 3);	}	/**	 * @return the <code>insets</code> value	 */	public Insets getBorderInsets(Component c) {		return insets;	}	/**	 * @return whether not the border is opaque	 */	public boolean isBorderOpaque() {		// we'll be filling in our own background.		return true;	}	/**	 * The paint method for this border	 */	public void paintBorder(Component c, Graphics g, int x, int y, int w, int h) {		// choose which colors we want to use		Color bg = c.getBackground();		if (c.getParent() != null)			bg = c.getParent().getBackground();		Color mid = bg.darker();		Color rect = mid.darker();		Color edge = average(mid, bg);		// fill in the corners with the parent-background		// so it looks see-through		g.setColor(bg);		g.fillRect(0, h - 3, 3, 3);		g.fillRect(w - 3, 0, 3, 3);		g.fillRect(w - 3, h - 3, 3, 3);		// draw the outline		g.setColor(rect);		g.drawRect(0, 0, w - 3, h - 3);		// draw the drop-shadow		g.setColor(mid);		g.drawLine(1, h - 2, w - 2, h - 2);		g.drawLine(w - 2, 1, w - 2, h - 2);		g.setColor(edge);		g.drawLine(2, h - 1, w - 2, h - 1);		g.drawLine(w - 1, 2, w - 1, h - 2);	}	/**	 * Returns the average color between the two provided	 * @param c1 the first color	 * @param c2 the second color	 * @return the average of the input colors	 */	private static Color average(Color c1, Color c2) {		int red = c1.getRed() + (c2.getRed() - c1.getRed()) / 2;		int green = c1.getGreen() + (c2.getGreen() - c1.getGreen()) / 2;		int blue = c1.getBlue() + (c2.getBlue() - c1.getBlue()) / 2;		return new Color(red, green, blue);	}	/**	 * @return the shared instance of this class	 */	public static JGraphShadowBorder getSharedInstance() {		return sharedInstance;	}}