Letters - Words - Lines - Shuffle
Fun With Letters and Words - Falling Letters
Now let's have some real fun with falling letters! We create a class
FallingCharacter that represents
the falling letters. We create an array of objects of that class
(here: 100, represented by the variable MAX,
can be changed easily). Each object takes care for random values for
the initial position, size, color and speed! The speed is represented
by the double precision floating point variable
yinc, which is added to the y
position in the member method fall().
Only floating point variables guarantee for smooth movement in many
different speed values. They are casted to int values only in the
paint method, in the end. The constructor of the FallingCharacter
class receives the width and height of the applet as parameters, to
make it possible to easily change the applet size without changing
the code. After reaching the bottom of the window, the letters
reappear at the top again.
|
//Sourcecode
import java.awt.*;
import java.applet.*;
class FallingCharacter
{
int fontSize, h;
double x, y, yinc;
String s, alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
Color color;
Graphics g;
Font font;
public FallingCharacter(int width, int height)
{
h=height;
//random font size 10..50
fontSize=(int)(Math.random()*40)+10;
font=new Font("TimesRoman", Font.PLAIN, fontSize);
//random font color
int red=(int)(Math.random()*255);
int green=(int)(Math.random()*255);
int blue=(int)(Math.random()*255);
color=new Color(red, green, blue);
//random initial coordinates within the applet bounderies
x=(Math.random()*width);
y=(Math.random()*height);
//random falling speed
yinc=(Math.random()*2.5)+1.0;
//random substring from the alphabet string (one out of 26 characters)
int character=(int)(Math.random()*26);
s=alphabet.substring(character, character+1);
}
public void fall()
{
if(y<h+fontSize)
y+=yinc;
else
y=-fontSize;
}
public void paint(Graphics gr)
{
g=gr;
g.setColor(color);
g.setFont(font);
g.drawString(s,(int)x,(int)y);
}
}
public class Project38 extends Applet implements Runnable
{
Thread runner;
Image Buffer;
Graphics gBuffer;
int i;
static final int MAX=100;
FallingCharacter fc[];
public void init()
{
//create graphics buffer, the size of the applet
Buffer=createImage(size().width,size().height);
gBuffer=Buffer.getGraphics();
fc = new FallingCharacter[MAX];
for(i=0;i<MAX;i++)
fc[i] = new FallingCharacter(size().width-30,size().height);
}
public void start()
{
if (runner == null)
{
runner = new Thread (this);
runner.start();
}
}
public void stop()
{
if (runner != null)
{
runner.stop();
runner = null;
}
}
public void run()
{
while(true)
{
Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
try {runner.sleep(15);}
catch (Exception e) { }
repaint();
}
}
public void drawStuff()
{
gBuffer.setColor(Color.black);
gBuffer.fillRect(0,0,size().width,size().height);
for(i=0;i<MAX;i++)
fc[i].fall();
for(i=0;i<MAX;i++)
fc[i].paint(gBuffer);
}
public void update(Graphics g)
{
paint(g);
}
public void paint(Graphics g)
{
drawStuff();
g.drawImage (Buffer,0,0, this);
}
}
|
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.