Returns the alpha channel of the color - Java 2D Graphics

Java examples for 2D Graphics:Color Alpha

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Description

Returns the alpha channel of the color

Demo Code

/**/*from   w  w w. ja  v  a2s . c om*/
 * Utility class to deal with ARGB color format
 *
 * @author Aritz Lopez
 * @license Lesser GNU Public License v3 (http://www.gnu.org/licenses/lgpl.html)
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        int color = 2;
        System.out.println(getAlpha(color));
    }

    /**
     * The mask to get the two least significant bytes of an integer;
     */
    public static final int MASK = 0xFF;
    /**
     * The shifting used to put the alpha component in position
     */
    public static final int ALPHA_SHIFT = 24;

    /**
     * Returns the alpha channel of the color
     *
     * @param color The color to get the alpha channel of
     * @return The alpha channel of the color
     */
    public static int getAlpha(final int color) {
        return (color >> ALPHA_SHIFT) & MASK;
    }
}

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