ColorUtil.java Source code

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Here is the source code for ColorUtil.java

Source

/*
 * Copyright (C) 2004 NNL Technology AB
 * Visit www.infonode.net for information about InfoNode(R) 
 * products and how to contact NNL Technology AB.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA 02111-1307, USA.
 */

// $Id: ColorUtil.java,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)),
                        c.getAlpha());
    }

    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()), c1.getAlpha());
    }

    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());
    }

}