Programming Languages Suite/JBuilder8.iso/Solaris/resource/jre/demo/plugin/applets/NervousText/NervousText.java

Java Source | 2002-09-06 | 5.6 KB | 191 lines

/*
 * Copyright (c) 2002 Sun Microsystems, Inc. All  Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * -Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduct the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * 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 OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF 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.
 *
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)NervousText.java    1.9 02/06/13
 */

import java.awt.event.*;
import java.awt.Graphics;
import java.awt.Font;
import java.applet.Applet;

/**
 * An applet that displays jittering text on the screen.
 *
 * @author Daniel Wyszynski 04/12/95
 * @version 1.10, 02/05/97
 * @modified 05/09/95 kwalrath Changed string; added thread suspension
 * @modified 02/06/98 madbot removed use of suspend and resume and cleaned up
 */

public class NervousText extends Applet implements Runnable, MouseListener {
    String banner;        // The text to be displayed
    char bannerChars[];        // The same text as an array of characters
    char attributes[];        // Character attributes ('^' for superscript)
    Thread runner = null;    // The thread that is displaying the text
    boolean threadSuspended;    // True when thread suspended (via mouse click)

    static final int REGULAR_WD = 15;
    static final int REGULAR_HT = 36;
    static final int SMALL_WD = 12;
    static final int SMALL_HT = 24;

    Font regularFont = new Font("Serif", Font.BOLD, REGULAR_HT);
    Font smallFont = new Font("Serif", Font.BOLD, SMALL_HT);

    public void init() {
    banner = getParameter("text");
    if (banner == null) {
        banner = "HotJava";
    }

        int bannerLength = banner.length();
    StringBuffer bc = new StringBuffer(bannerLength);
    StringBuffer attrs = new StringBuffer(bannerLength);
    int wd = 0;
    for (int i = 0; i < bannerLength; i++) {
        char c = banner.charAt(i);
        char a = 0;
        if (c == '^') {
        i++;
        if (i < bannerLength) {
            c = banner.charAt(i);
            a = '^';
            wd += SMALL_WD - REGULAR_WD;
        } else {
            break;
        }
        }
        bc.append(c);
        attrs.append(a);
        wd += REGULAR_WD;
    }

    bannerLength = bc.length();
    bannerChars =  new char[bannerLength];
    attributes = new char[bannerLength];
    bc.getChars(0, bannerLength, bannerChars, 0);
    attrs.getChars(0, bannerLength, attributes, 0);

        threadSuspended = false;
    resize(wd + 10, 50);
    addMouseListener(this);
    }

    public void destroy() {
        removeMouseListener(this);
    }

    public void start() {
        runner = new Thread(this);
        runner.start();
    }

    public synchronized void stop() {
    runner = null;
        if (threadSuspended) {
            threadSuspended = false;
            notify();
        }
    }

    public void run() {
        Thread me = Thread.currentThread();
        while (runner == me) {
            try {
                Thread.sleep(100);
                synchronized(this) {
                    while (threadSuspended) {
                        wait();
                    }
                }
            } catch (InterruptedException e){
            }
            repaint();
        }
    }

    public void paint(Graphics g) {
    int length = bannerChars.length;
        for (int i = 0, x = 0; i < length; i++) {
        int wd, ht;
        if (attributes[i] == '^') {
        wd = SMALL_WD;
        ht = SMALL_HT;
        g.setFont(smallFont);
        } else {
        wd = REGULAR_WD;
        ht = REGULAR_HT;
        g.setFont(regularFont);
        }
            int px = (int) (10 * Math.random() + x);
            int py = (int) (10 * Math.random() + ht);
            g.drawChars(bannerChars, i, 1, px, py);
        x += wd;
    }
    }

    public synchronized void mousePressed(MouseEvent e) {
        e.consume();
        threadSuspended = !threadSuspended;
        if (!threadSuspended)
            notify();
    }

    public void mouseReleased(MouseEvent e) {
    }

    public void mouseEntered(MouseEvent e) {
    }

    public void mouseExited(MouseEvent e) {
    }

    public void mouseClicked(MouseEvent e) {
    }

    public String getAppletInfo() {
        return "Title: NervousText\nAuthor: Daniel Wyszynski\nDisplays a text banner that jitters.";
    }

    public String[][] getParameterInfo() {
        String pinfo[][] = {
            {"text", "string", "Text to display"},
        };
        return pinfo;
    }
}