Creates a new Color with RGB from color and the alpha value of alpha - Java 2D Graphics

Java examples for 2D Graphics:Color RGB

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Description

Creates a new Color with RGB from color and the alpha value of alpha

Demo Code

/*//  ww  w . ja  v  a 2  s.co m
 * This library is dual-licensed: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation. For the terms of this
 * license, see licenses/gpl_v3.txt or <http://www.gnu.org/licenses/>.
 *
 * You are free to use this library under the terms of the GNU General
 * Public License, 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.
 *
 * Alternatively, you can license this library under a commercial
 * license, as set out in licenses/commercial.txt.
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    /**
     * Creates a new {@link Color} with RGB from <code>color</code> and the alpha value  of <code>alpha</code>
     * @param color {@link Color} you want to have with <code>alpha</code>
     * @param alpha alpha value you want to set. Must be between 0f and 1f
     * @return new {@link Color} with <code>alpha</code>
     */
    public static Color withAlpha(Color color, float alpha) {
        final int newAlpha = floatAlphaToIntAlpha(alpha);
        return new Color(color.getRed(), color.getGreen(), color.getBlue(),
                newAlpha);
    }

    /**
     * Converts a float value between 0f and 1f to an int value
     * between 0 and 255
     * @param alpha value between 0f and 1f
     * @return int value between 0 and 255
     */
    public static int floatAlphaToIntAlpha(float alpha) {
        if (alpha < 0f || alpha > 1f) {
            throw new IllegalArgumentException(
                    "alpha must be between 0f and 1f. value: " + alpha);
        }
        return (int) (255 * alpha);
    }
}

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