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/*
* $Id: JGraphShadowBorder.java,v 1.3 2005/11/25 15:53:11 david Exp $
* Copyright (c) 2001-2005, Gaudenz Alder
*
* All rights reserved.
*
* This file is licensed under the JGraph software license, a copy of which
* will have been provided to you in the file LICENSE at the root of your
* installation directory. If you are unable to locate this file please
* contact JGraph sales for another copy.
*/
package com.jgraph.example;
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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