--- /dev/null 2018-05-11 11:35:11.000000000 -0700 +++ new/src/demo/share/jfc/J2Ddemo/java2d/demos/Colors/BullsEye.java 2018-05-11 11:35:11.000000000 -0700 @@ -0,0 +1,76 @@ +/* + * + * Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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 of Oracle 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 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +package java2d.demos.Colors; + + +import static java.awt.Color.RED; +import static java.awt.Color.WHITE; +import java.awt.Color; +import java.awt.Graphics2D; +import java.awt.geom.Ellipse2D; +import java2d.Surface; + + +/** + * Creating colors with an alpha value. + */ +@SuppressWarnings("serial") +public class BullsEye extends Surface { + + public BullsEye() { + setBackground(WHITE); + } + + @Override + public void render(int w, int h, Graphics2D g2) { + + Color reds[] = { RED.darker(), RED }; + for (int N = 0; N < 18; N++) { + float i = (N + 2) / 2.0f; + float x = (5 + i * (w / 2 / 10)); + float y = (5 + i * (h / 2 / 10)); + float ew = (w - 10) - (i * w / 10); + float eh = (h - 10) - (i * h / 10); + float alpha = (N == 0) ? 0.1f : 1.0f / (19.0f - N); + if (N >= 16) { + g2.setColor(reds[N - 16]); + } else { + g2.setColor(new Color(0f, 0f, 0f, alpha)); + } + g2.fill(new Ellipse2D.Float(x, y, ew, eh)); + } + } + + public static void main(String s[]) { + createDemoFrame(new BullsEye()); + } +}