1 /*

     2  *

     3  * Copyright (c) 2007, 2011, 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,

    26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    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 

    49     public BullsEye() {

    50         setBackground(WHITE);

    51     }

    52 

    53     @Override

    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 

    73     public static void main(String s[]) {

    74         createDemoFrame(new BullsEye());

    75     }

    76 }