Returns a new color equal to the old one, except that there is no alpha (transparency) channel. - Java 2D Graphics

Java examples for 2D Graphics:Color Alpha

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Description

Returns a new color equal to the old one, except that there is no alpha (transparency) channel.

Demo Code

/*//from w w  w .  j a v  a 2s.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 that there is no alpha
     * (transparency) channel.
     * <p>
     * This method is a convenience and has the same effect as {@code
     * setAlpha(color, 255)}.
     * 
     * @param color
     *            the color to remove the alpha (transparency) from
     * @return a new non-transparent {@code Color}
     * @throws NullPointerException
     *             if {@code color} is {@code null}
     */
    public static Color removeAlpha(Color color) {
        return setAlpha(color, 255);
    }

    /**
     * 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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