Sets the alpha in the Graphics object. - Java 2D Graphics

Java examples for 2D Graphics:Graphics

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Description

Sets the alpha in the Graphics object.

Demo Code

/*/*ww w  .  ja  va2s  . c  o m*/
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name "TwelveMonkeys" nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
//package com.java2s;
import java.awt.*;

public class Main {
    /**
     * Sets the alpha in the {@code Graphics} object.
     * <p/>
     * Alpha is set by casting to {@code Graphics2D} and setting the composite
     * to the rule {@code AlphaComposite.SRC_OVER} multiplied by the given
     * alpha.
     *
     * @param pGraphics the graphics object
     * @param pAlpha the alpha level, {@code alpha} must be a floating point
     *        number in the inclusive range [0.0,&nbsp;1.0].
     * @throws ClassCastException if {@code pGraphics} is not an instance of
     *         {@code Graphics2D}.
     *
     * @see java.awt.AlphaComposite#SRC_OVER
     * @see java.awt.AlphaComposite#getInstance(int, float)
     */
    public static void setAlpha(final Graphics pGraphics, final float pAlpha) {
        ((Graphics2D) pGraphics).setComposite(AlphaComposite.getInstance(
                AlphaComposite.SRC_OVER, pAlpha));
    }
}

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