001 /*
002 * $Id: AlphaPainter.java 3279 2009-03-01 12:01:11Z rah003 $
003 *
004 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
005 * Santa Clara, California 95054, U.S.A. All rights reserved.
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
020 */
021
022
023 package org.jdesktop.swingx.painter;
024
025 import java.awt.AlphaComposite;
026 import java.awt.Graphics2D;
027
028 /**
029 * Applies an alpha value to an entire stack of painters.
030 *
031 * @author joshy
032 */
033 public class AlphaPainter<T> extends CompoundPainter<T> {
034 private float alpha = 1.0f;
035
036 /**
037 * {@inheritDoc}
038 */
039 @Override
040 protected void doPaint(Graphics2D g, T component, int width, int height) {
041 Graphics2D g2 = (Graphics2D) g.create();
042
043 try {
044 if(getTransform() != null) {
045 g2.setTransform(getTransform());
046 }
047 if(alpha < 1) {
048 g2.setComposite(AlphaComposite.getInstance(
049 AlphaComposite.SRC_OVER, alpha));
050 }
051
052 super.doPaint(g2, component, width, height);
053 } finally {
054 g2.dispose();
055 }
056 }
057 /*
058 public static void main(String ... args) {
059 JXPanel panel = new JXPanel();
060 AlphaPainter alpha = new AlphaPainter();
061 alpha.setAlpha(1f);
062 alpha.setPainters(new PinstripePainter(new Color(255,255,255,125),45,20,20));
063
064 panel.setBackgroundPainter(new CompoundPainter(
065 new MattePainter(Color.RED),
066 alpha
067 ));
068
069 JFrame frame = new JFrame();
070 frame.add(panel);
071 frame.pack();
072 frame.setSize(200,200);
073 frame.setVisible(true);
074 }*/
075
076 /**
077 * Returns the current alpha value for this painter. This is the alpha value that will be applied
078 * to all painters set inside this painter. Alpha values will be multiplied. This means if you set an
079 * alpha of 0.5 on this painter and you nest a painter inside which uses an alpha of 0.5 then the final
080 * pixels drawn will have an alpha of 0.25.
081 * @return the current value of alpha property
082 */
083 public float getAlpha() {
084 return alpha;
085 }
086
087 /**
088 * Sets the current alpha value for this painter. This is the alpha value that will be applied
089 * to all painters set inside this painter. Alpha values will be multiplied. This means if you set an
090 * alpha of 0.5 on this painter and you nest a painter inside which uses an alpha of 0.5 then the final
091 * pixels drawn will have an alpha of 0.25.
092 * @param alpha the new value of the alpha property
093 */
094 public void setAlpha(float alpha) {
095 float old = getAlpha();
096 this.alpha = alpha;
097 firePropertyChange("alpha", old, getAlpha());
098 }
099 }