/*
* 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());
}
}
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