Blink.java

/*
 * Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
 */

import java.awt.*;
import java.util.StringTokenizer;

/**
 * I love blinking things.
 *
 * @author Arthur van Hoff
 */
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 = size();

    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(Color.lightGray);
        }
        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();
    }
    }
}