?? jgraphshadowborder.java
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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; }}
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