LineDemo Source
Java Source:
/*Applet by Gurpreet singh ahluwalia
E-mail at gurpreet_gh761230@rediffmail.com
This applet creates moving lines with animated effects just like any screensaver with very simple code.
The programme is complied in jdk1.2.1 version.
*/
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class linesdemo extends Applet implements Runnable,ActionListener
{
Button b1;
Thread t,t1,t2,t3,color;
//t1 for leftx to travel to left direction
//t2 for rightx to travel to left direction
//t3 for sparkles effect
//color for changing line color
int linecolor=5; //for lines color
int sparkles=0; //for sparkles
//create object to avoid flickering;
Image flick;
Graphics gflick;
int leftx=200; //x'axes which will travel to left direction
int rightx=200; //x'axes which will travel to right direction
int y1=200; //starting y'axes
public void init()
{
flick=createImage(size().width,size().height);
gflick=flick.getGraphics();
b1=new Button("animate");
b1.addActionListener(this);
add(b1);
t1=new Thread(this);
t2=new Thread(this);
t3=new Thread(this);
color=new Thread(this);
t1.start();
t2.start();
t3.start();
color.start();
}
public void run()
{
t=Thread.currentThread();
if(t==t1)
{
while(true)
{
for(leftx=200;leftx>0;leftx--)
{
try{
t1.sleep(20);
}
catch(Exception e){}
repaint();
}
}
}
if(t==t2)
{
while(true)
{
for(rightx=200;rightx<=400;rightx++)
{
try
{
t2.sleep(20);
}
catch(Exception e){}
repaint();
}
}
}
if(t==color)
{
while(true)
{
for(linecolor=5;linecolor<=255;linecolor++)
{
if(linecolor==255)
{
for(linecolor=255;linecolor>=5;linecolor--)
{
try{
color.sleep(50);
}
catch(Exception e){}
repaint();
}
}
try{
color.sleep(50);
}
catch(Exception e){}
repaint();
}
}
}
if(t==t3)
{
while(true)
{
sparkles=(int)(Math.round(Math.random())*255);
try{
t3.sleep(500);
}
catch(Exception w) { }
repaint();
}
}
}
public void paint(Graphics g)
{
gflick.setColor(Color.black);
gflick.fillRect(0,0,size().width,size().height);
//create color object to change color of lines
Color c=new Color(150,50,linecolor);
gflick.setColor(c);
for(int i=0;i<size().width;i=i+30)
{
gflick.drawLine(200,y1,rightx,0+i); //draws ending y'axes for rightxline
gflick.drawLine(200,y1,leftx,0+i); //draws ending y'axes for leftxline
}
//create color object to create effects of sparkles
Color c1=new Color(sparkles,sparkles,sparkles);
gflick.setColor(c1);
for(int i1=0;i1<10;i1++)
{
int x=(int)(getSize().width*Math.random());//draws random sparkles in width of applet
int y=(int)(getSize().height*Math.random());//draws random sparkles in width of applet
gflick.fillRect(x,y,(int)1.5,(int)1.5);
}
g.drawImage(flick,0,0,this);
}
public void update(Graphics g)
{
paint(g);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==b1)
{
// to change the postion of lines on click
leftx=(int)(Math.round(Math.random())*400);
rightx=(int)(Math.round(Math.random())*400);
y1=(int)(Math.random()*300);
}
}
}
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