|
|
|
PictureButton
/*
* Blackboard.java
*
* Copyright (c) 1999 by Rüdiger Appel, All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies.
*
* See also: http://www.3quarks.com
*
*/
import java.applet.*;
import java.awt.*;
import java.util.*;
public class Blackboard extends Applet implements Runnable
{
private Thread loader = null;
private boolean allLoaded = false;
private Image buffer = null;
private Image background = null;
private Image textImage[] = null;
private int textCount = 14;
private int textLine1[] = { 0, 2, 8, 5, 9, 12 };
private int textLine2[] = { 1, 3, 8, 6, 10, 12 };
private int textLine3[] = { 1, 4, 8, 7, 11, 13 };
private int language = 0;
public Blackboard ()
{
// write applet info
System.out.println (getAppletInfo ());
}
public String getAppletInfo ()
{
// return my copyright notice
return "Blackboard, Version 1.0"
+ System.getProperty ("line.separator")
+ "Copyright (c) 1999 by Rüdiger Appel, All Rights Reserved"
+ System.getProperty ("line.separator")
+ "See also: http://www.3quarks.com";
}
public void init ()
{
// get and set background parameters
Color backgroundColor = getColorParameter ("BackgroundColor");
if (backgroundColor != null)
setBackground (backgroundColor);
// get language
try
{
if (getParameter ("Language").trim ().equalsIgnoreCase ("Deutsch"))
language = 1;
}
catch (Exception exception) {}
// initialize german text lines
if (language == 1)
{
textLine1[2] = 5;
textLine2[2] = 6;
textLine3[2] = 7;
textLine1[3] = 8;
textLine2[3] = 8;
textLine3[3] = 8;
}
}
private Color getColorParameter (String name)
{
// return a color parameter
try
{
StringTokenizer tokenizer = new StringTokenizer (getParameter (name), ",");
switch (tokenizer.countTokens ())
{
case 1:
{
String value = tokenizer.nextToken ().trim ();
if ((value.length () == 7) && (value.charAt (0) == '#'))
return new Color (Integer.parseInt (value.substring (1, 3), 16),
Integer.parseInt (value.substring (3, 5), 16),
Integer.parseInt (value.substring (5, 7), 16));
}
case 3:
return new Color (Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()));
}
}
catch (Exception exception) {}
return null;
}
public void update (Graphics graphics)
{
paint (graphics);
}
public void paint (Graphics graphics)
{
// get applet size
int width = size ().width;
int height = size ().height;
// create buffer if not exist
if (buffer == null)
buffer = createImage (width, height);
// get buffer graphics
Graphics bufferGraphics = buffer.getGraphics ();
bufferGraphics.clipRect (0, 0, width, height);
// fill background
bufferGraphics.setColor (getBackground ());
bufferGraphics.fillRect (0, 0, width, height);
// draw background
if (background != null)
{
int backgroundWidth = background.getWidth (this);
int backgroundHeight = background.getHeight (this);
for (int x = 0; x < width; x += backgroundWidth)
for (int y = 0; y < height; y += backgroundHeight)
bufferGraphics.drawImage (background, x, y, this);
}
// draw text lines
if (textImage != null)
{
paintTextLine (bufferGraphics, 17, 16, textLine1);
paintTextLine (bufferGraphics, 17, 45, textLine2);
paintTextLine (bufferGraphics, 17, 74, textLine3);
}
// paint buffer
graphics.drawImage (buffer, 0, 0, this);
}
public void paintTextLine (Graphics graphics, int x, int y, int textLine[])
{
// check text line
if (textLine == null)
return;
// draw text
for (int index = 0; index < textLine.length; index++)
{
// get image index
int imageIndex = textLine[index];
// check image index
if ((imageIndex >= 0) && (imageIndex < textImage.length))
{
// check image
if (textImage[imageIndex] != null)
{
// paint image
graphics.drawImage (textImage[imageIndex], x, y, this);
// update x position
x += textImage[imageIndex].getWidth (this);
}
}
}
}
public boolean action (Event event, Object what)
{
String source = (String) what;
// set color
if (source.equalsIgnoreCase ("RedButton"))
{
textLine1[1] = 2;
textLine2[1] = 3;
textLine3[1] = 4;
}
else if (source.equalsIgnoreCase ("YellowButton"))
{
textLine1[1] = 3;
textLine2[1] = 4;
textLine3[1] = 2;
}
else if (source.equalsIgnoreCase ("GreenButton"))
{
textLine1[1] = 4;
textLine2[1] = 2;
textLine3[1] = 3;
}
else
return super.action (event, what);
if (Math.random () > 0.5)
{
int temp = textLine2[1];
textLine2[1] = textLine3[1];
textLine3[1] = temp;
}
// set random condition
randomize ((language == 1) ? 2 : 3, 5, 6, 7);
// set random action
randomize (4, 9, 10, 11);
// repaint canvas
repaint ();
return super.action (event, what);
}
public void randomize (int index, int value1, int value2, int value3)
{
switch (new Double (Math.random () * 3.0).intValue ())
{
case 0: textLine1[index] = value1;
textLine2[index] = value2;
textLine3[index] = value3;
break;
case 1: textLine1[index] = value2;
textLine2[index] = value3;
textLine3[index] = value1;
break;
default: textLine1[index] = value3;
textLine2[index] = value1;
textLine3[index] = value2;
}
if (Math.random () > 0.5)
{
int temp = textLine2[index];
textLine2[index] = textLine3[index];
textLine3[index] = temp;
}
}
public void start ()
{
// initialize textlines
textLine1[1] = 2;
textLine2[1] = 3;
textLine3[1] = 4;
textLine1[4] = 9;
textLine2[4] = 10;
textLine3[4] = 11;
if (language == 1)
{
textLine1[2] = 5;
textLine2[2] = 6;
textLine3[2] = 7;
}
else
{
textLine1[3] = 5;
textLine2[3] = 6;
textLine3[3] = 7;
}
// start loader
if (!allLoaded)
{
loader = new Thread (this);
loader.start ();
}
}
public void stop ()
{
// stop loader
if (loader != null)
{
loader.stop ();
loader = null;
}
}
public void run ()
{
if (Thread.currentThread () == loader)
{
// load all images
MediaTracker tracker = new MediaTracker (this);
background = loadImage (tracker, getParameter ("BackgroundImage"), 1);
if (background != null)
repaint ();
String imagePrefix = getParameter ("ImagePrefix");
if (imagePrefix != null)
{
textImage = new Image[textCount];
for (int index = 1; index <= textCount; index++)
{
String imageName = imagePrefix + ((index < 10) ? "0" : "") + index + ".gif";
textImage[index - 1] = loadImage (tracker, imageName, 1 + index);
}
repaint ();
}
allLoaded = true;
}
}
private Image loadImage (MediaTracker tracker, String name, int identifier)
{
// load an image
if (name != null)
{
Image image = getImage (getCodeBase (), name);
tracker.addImage (image, identifier);
try
{
tracker.waitForID (identifier);
if (!tracker.isErrorID (identifier))
return image;
}
catch (InterruptedException exception) {}
}
return null;
}
}
Return to the index |
|
Applet Index (sorted alphabetically) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #s |
The Java Source (applets w/source code) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
How to Add Java Applets to Your Site
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
sequences into three useful formats.
Elsewhere on internet.com:
WebDeveloper Java
Lots of Java information on webdeveloper.com
WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.
ScriptSearch Java
Hundreds of free Java code files to download.
jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.
Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.
