1 /*
2  *
3  * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  *   - Redistributions of source code must retain the above copyright
10  *     notice, this list of conditions and the following disclaimer.
11  *
12  *   - Redistributions in binary form must reproduce the above copyright
13  *     notice, this list of conditions and the following disclaimer in the
14  *     documentation and/or other materials provided with the distribution.
15  *
16  *   - Neither the name of Oracle nor the names of its
17  *     contributors may be used to endorse or promote products derived
18  *     from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
21  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package java2d.demos.Colors;
33 
34 
35 import static java.awt.Color.RED;
36 import static java.awt.Color.WHITE;
37 import java.awt.Color;
38 import java.awt.Graphics2D;
39 import java.awt.geom.Ellipse2D;
40 import java2d.Surface;
41 
42 
43 /**
44  * Creating colors with an alpha value.
45  */
46 @SuppressWarnings("serial")
47 public class BullsEye extends Surface {
48 
BullsEye()49     public BullsEye() {
50         setBackground(WHITE);
51     }
52 
53     @Override
render(int w, int h, Graphics2D g2)54     public void render(int w, int h, Graphics2D g2) {
55 
56         Color[] reds = { RED.darker(), RED };
57         for (int N = 0; N < 18; N++) {
58             float i = (N + 2) / 2.0f;
59             float x = (5 + i * (w / 2 / 10));
60             float y = (5 + i * (h / 2 / 10));
61             float ew = (w - 10) - (i * w / 10);
62             float eh = (h - 10) - (i * h / 10);
63             float alpha = (N == 0) ? 0.1f : 1.0f / (19.0f - N);
64             if (N >= 16) {
65                 g2.setColor(reds[N - 16]);
66             } else {
67                 g2.setColor(new Color(0f, 0f, 0f, alpha));
68             }
69             g2.fill(new Ellipse2D.Float(x, y, ew, eh));
70         }
71     }
72 
main(String[] s)73     public static void main(String[] s) {
74         createDemoFrame(new BullsEye());
75     }
76 }
77