Returns a new color equal to the old one, except the brightness is set to the new value. - Java 2D Graphics

Java examples for 2D Graphics:Color Light

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Description

Returns a new color equal to the old one, except the brightness is set to the new value.

Demo Code

/*//from   w  w w. ja  v  a2s. 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 {
    /**
     * Returns a new color equal to the old one, except the brightness is set to
     * the new value. The new color will have the same alpha (transparency) as
     * the original color.
     * <p>
     * The color is modified using HSB calculations. The brightness must be a
     * float between 0 and 1. If 0 the resulting color will be black. If 1 the
     * resulting color will be the brightest possible form of the passed in
     * color.
     * 
     * @param color
     *            the color to modify
     * @param brightness
     *            the brightness to use in the new color
     * @return a new brightness-applied {@code Color}
     * @throws IllegalArgumentException
     *             if {@code brightness} is not between 0 and 1 inclusive
     * @throws NullPointerException
     *             if {@code color} is {@code null}
     */
    public static Color setBrightness(Color color, float brightness) {
        if (brightness < 0f || brightness > 1f) {
            throw new IllegalArgumentException("invalid brightness value");
        }

        int alpha = color.getAlpha();

        float[] hsb = Color.RGBtoHSB(color.getRed(), color.getGreen(),
                color.getBlue(), null);
        Color c = Color.getHSBColor(hsb[0], hsb[1], brightness);

        return setAlpha(c, alpha);
    }

    /**
     * Returns a new color equal to the old one, except alpha (transparency)
     * channel is set to the new value.
     * 
     * @param color
     *            the color to modify
     * @param alpha
     *            the new alpha (transparency) level. Must be an int between 0
     *            and 255
     * @return a new alpha-applied {@code Color}
     * @throws IllegalArgumentException
     *             if {@code alpha} is not between 0 and 255 inclusive
     * @throws NullPointerException
     *             if {@code color} is {@code null}
     */
    public static Color setAlpha(Color color, int alpha) {
        if (alpha < 0 || alpha > 255) {
            throw new IllegalArgumentException("invalid alpha value");
        }

        return new Color(color.getRed(), color.getGreen(), color.getBlue(),
                alpha);
    }
}

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