Static methods for some common painting functions : Paint « 2D Graphics GUI « Java

Static methods for some common painting functions

* @(#)  1.0  2008-03-01
* Copyright (c) 2008 Jeremy Wood
* E-mail:
* All rights reserved.
* The copyright of this software is owned by Jeremy Wood.
* You may not use, copy or modify this software, except in
* accordance with the license agreement you entered into with
* Jeremy Wood. For details see accompanying license terms.

import java.awt.*;

import javax.swing.*;

/** Some static methods for some common painting functions.
 * @version 1.0
 * @author Jeremy Wood
public class PaintUtils {

  /** Four shades of white, each with increasing opacity. */
  public final static Color[] whites = new Color[] {
      new Color(255,255,255,50),
      new Color(255,255,255,100),
      new Color(255,255,255,150)
  /** Four shades of black, each with increasing opacity. */
  public final static Color[] blacks = new Color[] {
      new Color(0,0,0,50),
      new Color(0,0,0,100),
      new Color(0,0,0,150)
  /** @return the color used to indicate when a component has
   * focus.  By default this uses the color (64,113,167), but you can
   * override this by calling:
   * <BR><code>UIManager.put("focusRing",customColor);</code>
  public static Color getFocusRingColor() {
    Object obj = UIManager.getColor("focusRing");
    if(obj instanceof Color)
      return (Color)obj;
    return new Color(64,113,167);
  /** Paints 3 different strokes around a shape to indicate focus.
   * The widest stroke is the most transparent, so this achieves a nice
   * "glow" effect.
   * <P>The catch is that you have to render this underneath the shape,
   * and the shape should be filled completely.
   * @param g the graphics to paint to
   * @param shape the shape to outline
   * @param biggestStroke the widest stroke to use.
  public static void paintFocus(Graphics2D g,Shape shape,int biggestStroke) {
    Color focusColor = getFocusRingColor();
    Color[] focusArray = new Color[] {
      new Color(focusColor.getRed(), focusColor.getGreen(), focusColor.getBlue(),255),
      new Color(focusColor.getRed(), focusColor.getGreen(), focusColor.getBlue(),170),
      new Color(focusColor.getRed(), focusColor.getGreen(), focusColor.getBlue(),110) 
    g.setStroke(new BasicStroke(biggestStroke));
    g.setStroke(new BasicStroke(biggestStroke-1));
    g.setStroke(new BasicStroke(biggestStroke-2));
    g.setStroke(new BasicStroke(1));
  /** Uses translucent shades of white and black to draw highlights
   * and shadows around a rectangle, and then frames the rectangle
   * with a shade of gray (120).
   * <P>This should be called to add a finishing touch on top of
   * existing graphics.
   * @param g the graphics to paint to.
   * @param r the rectangle to paint.
  public static void drawBevel(Graphics g,Rectangle r) {
    drawColors(blacks,g, r.x, r.y+r.height, r.x+r.width, r.y+r.height, SwingConstants.SOUTH);
    drawColors(blacks,g, r.x+r.width, r.y, r.x+r.width, r.y+r.height, SwingConstants.EAST);

    drawColors(whites,g, r.x, r.y, r.x+r.width, r.y, SwingConstants.NORTH);
    drawColors(whites,g, r.x, r.y, r.x, r.y+r.height, SwingConstants.WEST);
    g.setColor(new Color(120, 120, 120));
    g.drawRect(r.x, r.y, r.width, r.height);
  private static void drawColors(Color[] colors,Graphics g,int x1,int y1,int x2,int y2,int direction) {
    for(int a = 0; a<colors.length; a++) {
      if(direction==SwingConstants.SOUTH) {
        g.drawLine(x1, y1-a, x2, y2-a);
      } else if(direction==SwingConstants.NORTH) {
        g.drawLine(x1, y1+a, x2, y2+a);
      } else if(direction==SwingConstants.EAST) {
        g.drawLine(x1-a, y1, x2-a, y2);
      } else if(direction==SwingConstants.WEST) {
        g.drawLine(x1+a, y1, x2+a, y2);


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