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 = "HotJava";
76 }
77
78 int bannerLength = banner.length();
79 StringBuilder bc = new StringBuilder(bannerLength);
80 StringBuilder attrs = new StringBuilder(bannerLength);
81 int wd = 0;
82 for (int i = 0; i < bannerLength; i++) {
83 char c = banner.charAt(i);
84 char a = 0;
85 if (c == '^') {
86 i++;
87 if (i < bannerLength) {
88 c = banner.charAt(i);
89 a = '^';
90 wd += SMALL_WD - REGULAR_WD;
91 } else {
92 break;
93 }
94 }
95 bc.append(c);
96 attrs.append(a);
97 wd += REGULAR_WD;
98 }
99
100 bannerLength = bc.length();
101 bannerChars = new char[bannerLength];
102 attributes = new char[bannerLength];
103 bc.getChars(0, bannerLength, bannerChars, 0);
104 attrs.getChars(0, bannerLength, attributes, 0);
105
106 threadSuspended = false;
107 resize(wd + 10, 50);
108 addMouseListener(this);
109 }
110
111 @Override
112 public void destroy() {
113 removeMouseListener(this);
114 }
115
116 @Override
117 public void start() {
118 runner = new Thread(this);
119 runner.start();
120 }
121
122 @Override
123 public synchronized void stop() {
124 runner = null;
125 if (threadSuspended) {
126 threadSuspended = false;
127 notify();
128 }
129 }
130
131 @Override
132 public void run() {
133 Thread me = Thread.currentThread();
134 while (runner == me) {
135 try {
136 Thread.sleep(100);
137 synchronized (this) {
138 while (threadSuspended) {
139 wait();
140 }
141 }
142 } catch (InterruptedException e) {
143 }
144 repaint();
145 }
146 }
147
148 @Override
149 public void paint(Graphics g) {
150 int length = bannerChars.length;
151 for (int i = 0, x = 0; i < length; i++) {
152 int wd, ht;
153 if (attributes[i] == '^') {
154 wd = SMALL_WD;
155 ht = SMALL_HT;
156 g.setFont(smallFont);
157 } else {
158 wd = REGULAR_WD;
159 ht = REGULAR_HT;
160 g.setFont(regularFont);
161 }
162 int px = (int) (10 * Math.random() + x);
163 int py = (int) (10 * Math.random() + ht);
164 g.drawChars(bannerChars, i, 1, px, py);
165 x += wd;
166 }
167 }
168
169 @Override
170 public synchronized void mousePressed(MouseEvent e) {
171 e.consume();
172 threadSuspended = !threadSuspended;
173 if (!threadSuspended) {
174 notify();
175 }
176 }
177
178 @Override
179 public void mouseReleased(MouseEvent e) {
180 }
181
182 @Override
183 public void mouseEntered(MouseEvent e) {
184 }
185
186 @Override
187 public void mouseExited(MouseEvent e) {
188 }
189
190 @Override
191 public void mouseClicked(MouseEvent e) {
192 }
193
194 @Override
195 public String getAppletInfo() {
196 return "Title: NervousText\nAuthor: Daniel Wyszynski\n"
197 + "Displays a text banner that jitters.";
198 }
199
200 @Override
201 public String[][] getParameterInfo() {
202 String pinfo[][] = {
203 { "text", "string", "Text to display" }, };
204 return pinfo;
205 }
206 }