1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of Oracle nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * This source code is provided to illustrate the usage of a given feature
34 * or technique and has been deliberately simplified. Additional steps
35 * required for a production-quality application, such as security checks,
36 * input validation and proper error handling, might not be present in
37 * this sample code.
38 */
39
40
41
42 import java.awt.Graphics;
43 import java.awt.Font;
44 import java.applet.Applet;
45 import java.awt.event.MouseEvent;
46 import java.awt.event.MouseListener;
47
48
49 /**
50 * An applet that displays jittering text on the screen.
51 *
52 * @author Daniel Wyszynski 04/12/95
53 * @author 05/09/95 kwalrath Changed string; added thread suspension
54 * @author 02/06/98 madbot removed use of suspend and resume and cleaned up
55 */
56 @SuppressWarnings("serial")
57 public class NervousText extends Applet implements Runnable, MouseListener {
58
59 String banner; // The text to be displayed
60 char bannerChars[]; // The same text as an array of characters
61 char attributes[]; // Character attributes ('^' for superscript)
62 Thread runner = null; // The thread that is displaying the text
63 boolean threadSuspended; // True when thread suspended (via mouse click)
64 static final int REGULAR_WD = 15;
65 static final int REGULAR_HT = 36;
66 static final int SMALL_WD = 12;
67 static final int SMALL_HT = 24;
68 Font regularFont = new Font("Serif", Font.BOLD, REGULAR_HT);
69 Font smallFont = new Font("Serif", Font.BOLD, SMALL_HT);
70
71 @Override
72 public void init() {
73 banner = getParameter("text");
74 if (banner == null) {
75 banner = "Java Development Kit ";
76 }
77 banner += System.getProperty("java.version", "");
78
79 int bannerLength = banner.length();
80 StringBuilder bc = new StringBuilder(bannerLength);
81 StringBuilder attrs = new StringBuilder(bannerLength);
82 int wd = 0;
83 for (int i = 0; i < bannerLength; i++) {
84 char c = banner.charAt(i);
85 char a = 0;
86 if (c == '^') {
87 i++;
88 if (i < bannerLength) {
89 c = banner.charAt(i);
90 a = '^';
91 wd += SMALL_WD - REGULAR_WD;
92 } else {
93 break;
94 }
95 }
96 bc.append(c);
97 attrs.append(a);
98 wd += REGULAR_WD;
99 }
100
101 bannerLength = bc.length();
102 bannerChars = new char[bannerLength];
103 attributes = new char[bannerLength];
104 bc.getChars(0, bannerLength, bannerChars, 0);
105 attrs.getChars(0, bannerLength, attributes, 0);
106
107 threadSuspended = false;
108 resize(wd + 10, 50);
109 addMouseListener(this);
110 }
111
112 @Override
113 public void destroy() {
114 removeMouseListener(this);
115 }
116
117 @Override
118 public void start() {
119 runner = new Thread(this);
120 runner.start();
121 }
122
123 @Override
124 public synchronized void stop() {
125 runner = null;
126 if (threadSuspended) {
127 threadSuspended = false;
128 notify();
129 }
130 }
131
132 @Override
133 public void run() {
134 Thread me = Thread.currentThread();
135 while (runner == me) {
136 try {
137 Thread.sleep(100);
138 synchronized (this) {
139 while (threadSuspended) {
140 wait();
141 }
142 }
143 } catch (InterruptedException e) {
144 }
145 repaint();
146 }
147 }
148
149 @Override
150 public void paint(Graphics g) {
151 int length = bannerChars.length;
152 for (int i = 0, x = 0; i < length; i++) {
153 int wd, ht;
154 if (attributes[i] == '^') {
155 wd = SMALL_WD;
156 ht = SMALL_HT;
157 g.setFont(smallFont);
158 } else {
159 wd = REGULAR_WD;
160 ht = REGULAR_HT;
161 g.setFont(regularFont);
162 }
163 int px = (int) (10 * Math.random() + x);
164 int py = (int) (10 * Math.random() + ht);
165 g.drawChars(bannerChars, i, 1, px, py);
166 x += wd;
167 }
168 }
169
170 @Override
171 public synchronized void mousePressed(MouseEvent e) {
172 e.consume();
173 threadSuspended = !threadSuspended;
174 if (!threadSuspended) {
175 notify();
176 }
177 }
178
179 @Override
180 public void mouseReleased(MouseEvent e) {
181 }
182
183 @Override
184 public void mouseEntered(MouseEvent e) {
185 }
186
187 @Override
188 public void mouseExited(MouseEvent e) {
189 }
190
191 @Override
192 public void mouseClicked(MouseEvent e) {
193 }
194
195 @Override
196 public String getAppletInfo() {
197 return "Title: NervousText\nAuthor: Daniel Wyszynski\n"
198 + "Displays a text banner that jitters.";
199 }
200
201 @Override
202 public String[][] getParameterInfo() {
203 String pinfo[][] = {
204 { "text", "string", "Text to display" }, };
205 return pinfo;
206 }
207 }