batik-test-old/src/test/java/org/apache/batik/svggen/Color2.java

/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.svggen;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;

/**
 * This test color opacity on fill and strokes, because this
 * is handled differently in the Java 2D API than in SVG.
 *
 * @author <a href="mailto:cjolif@ilog.fr">Christophe Jolif</a>
 * @author <a href="mailto:vhardy@eng.sun.com">Vincent Hardy</a>
 * @version $Id$
 */
public class Color2 implements Painter {
    public void paint(Graphics2D g) {
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                           RenderingHints.VALUE_ANTIALIAS_ON);

        // Define Colors
        Color blue = Color.blue;
        Color green = Color.green;
        Color transparentBlue = new Color(0, 0, 255, 128);
        Color transparentGreen = new Color(0, 255, 0, 128);

        // Define AlphaComposites
        AlphaComposite srcOver = AlphaComposite.SrcOver;
        AlphaComposite srcOverTransparent = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .5f);

        // Define rectangle
        Rectangle rect = new Rectangle(10, 40, 100, 50);

        // Define thick stroke
        BasicStroke thickStroke = new BasicStroke(5);

        // First test: Opaque Colors with AlphaComposite
        g.setPaint(Color.black);
        g.drawString("Opaque Colors, Half Transparent AlphaComposite", 10, 30);

        g.setComposite(srcOverTransparent);
        g.setStroke(thickStroke);
        g.setPaint(blue);
        g.fill(rect);
        g.setPaint(green);
        g.draw(rect);
        g.setPaint(Color.black);
        g.fill(rect);

        g.translate(0, 90);

        // Second test: transparent color, opaque Source Over
        g.setPaint(Color.black);
        g.setComposite(srcOver);
        g.drawString("Transparent Colors, Opaque AlphaComposite SrcOver", 10, 30);

        g.setPaint(transparentBlue);
        g.fill(rect);
        g.setPaint(transparentGreen);
        g.draw(rect);
    }
}