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 }