Color Util : Color « 2D Graphics GUI « Java

Color Util

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// $Id:,v 1.10 2005/02/16 11:28:14 jesper Exp $

import java.awt.*;

public final class ColorUtil {
  private ColorUtil() {

  public static Color getOpposite(Color c) {
    return isDark(c) ? Color.WHITE : Color.BLACK;

  public static Color shade(Color c, double amount) {
    return blend(c, getOpposite(c), amount);

  public static final Color mult(Color c, double amount) {
    return c == null ? null : new Color(Math.min(255, (int) (c.getRed() * amount)),
                                        Math.min(255, (int) (c.getGreen() * amount)),
                                        Math.min(255, (int) (c.getBlue() * amount)),

  public static Color setAlpha(Color c, int alpha) {
    return c == null ? null : new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);

  public static final Color add(Color c1, Color c2) {
    return c1 == null ? c2 :
           c2 == null ? c1 :
           new Color(Math.min(255, c1.getRed() + c2.getRed()),
                     Math.min(255, c1.getGreen() + c2.getGreen()),
                     Math.min(255, c1.getBlue() + c2.getBlue()),

  public static Color blend(Color c1, Color c2, double v) {
    double v2 = 1 - v;
    return c1 == null ? (c2 == null ? null : c2) :
           c2 == null ? c1 :
           new Color(Math.min(255, (int) (c1.getRed() * v2 + c2.getRed() * v)),
                     Math.min(255, (int) (c1.getGreen() * v2 + c2.getGreen() * v)),
                     Math.min(255, (int) (c1.getBlue() * v2 + c2.getBlue() * v)),
                     Math.min(255, (int) (c1.getAlpha() * v2 + c2.getAlpha() * v)));

  public static boolean isDark(Color c) {
    return c.getRed() + c.getGreen() + c.getBlue() < 3 * 180;

  public static Color highlight(Color c) {
    return mult(c, isDark(c) ? 1.5F : 0.67F);

  public static Color copy(Color c) {
    return c == null ? null : new Color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha());



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