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Chip 1998 November
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Blink.java
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1997-02-10
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/*
* @(#)Blink.java 1.4 97/02/05
*
* Copyright (c) 1994-1997 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.awt.*;
import java.util.StringTokenizer;
/**
* I love blinking things.
*
* @author Arthur van Hoff
* @modified 96/04/24 Jim Hagen : use getBackground
*/
public class Blink extends java.applet.Applet implements Runnable {
Thread blinker;
String lbl;
Font font;
int speed;
public void init() {
font = new java.awt.Font("TimesRoman", Font.PLAIN, 24);
String att = getParameter("speed");
speed = (att == null) ? 400 : (1000 / Integer.valueOf(att).intValue());
att = getParameter("lbl");
lbl = (att == null) ? "Blink" : att;
}
public void paint(Graphics g) {
int x = 0, y = font.getSize(), space;
int red = (int)(Math.random() * 50);
int green = (int)(Math.random() * 50);
int blue = (int)(Math.random() * 256);
Dimension d = getSize();
g.setColor(Color.black);
g.setFont(font);
FontMetrics fm = g.getFontMetrics();
space = fm.stringWidth(" ");
for (StringTokenizer t = new StringTokenizer(lbl) ; t.hasMoreTokens() ; ) {
String word = t.nextToken();
int w = fm.stringWidth(word) + space;
if (x + w > d.width) {
x = 0;
y += font.getSize();
}
if (Math.random() < 0.5) {
g.setColor(new java.awt.Color((red + y * 30) % 256, (green + x / 3) % 256, blue));
} else {
g.setColor(getBackground());
}
g.drawString(word, x, y);
x += w;
}
}
public void start() {
blinker = new Thread(this);
blinker.start();
}
public void stop() {
blinker.stop();
}
public void run() {
while (true) {
try {Thread.currentThread().sleep(speed);} catch (InterruptedException e){}
repaint();
}
}
}