Computes an appropriate foreground color (either white or black) for the given background color. - Java 2D Graphics

Java examples for 2D Graphics:Color

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Description

Computes an appropriate foreground color (either white or black) for the given background color.

Demo Code

/*/*from  w  ww  .ja  va  2 s.  c  o  m*/
 * $Id: ColorUtil.java 3742 2010-08-05 03:25:09Z kschaefe $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    /**
     * Computes an appropriate foreground color (either white or black) for the
     * given background color.
     * 
     * @param bg
     *            the background color
     * @return {@code Color.WHITE} or {@code Color.BLACK}
     * @throws NullPointerException
     *             if {@code bg} is {@code null}
     */
    public static Color computeForeground(Color bg) {
        float[] rgb = bg.getRGBColorComponents(null);
        float y = .3f * rgb[0] + .59f * rgb[1] + .11f * rgb[2];

        return y > .5f ? Color.BLACK : Color.WHITE;
    }
}

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