SPIRAL JAVA APPLET PROGRAM

                

Program :

/*<applet code = spiral height = 800 width = 800>

</applet>*/

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

public class spiral extends Applet implements ActionListener {

Dimension d;

Label l = new Label("radius = ");

TextField t = new TextField(3);

Button b = new Button("DRAW");

int xc,yc,rad;

public void init(){

add(l);

add(t);

add(b);

b.addActionListener(this);

}

public void  paint(Graphics g)

{

d=getSize();

xc = d.width/2;

yc=d.width/4;

rad=Integer.parseInt(t.getText());

int check=1;

int increment =1;

while(rad>0 && increment<rad)

{

int x=0;

int y=increment;

float p=5/4-y;

while(x<y)

{

if(p<0)

{

x++;

p=p+2*x+2+1;

}

else

{

x++;

y--;

p=p+2*x+2+1-2*y+2;

}

switch(check)

{

case 1:g.drawString(".",xc+x,yc+y);

g.setColor(Color.red);

break;

case 2:g.drawString(".",xc+y,yc+x);

g.setColor(Color.blue);

break;

case 3:g.drawString(".",xc-x,yc+y);

g.setColor(Color.green);

break;

case 4:g.drawString(".",xc-y,yc+x);

g.setColor(Color.black);

break;

case 5:g.drawString(".",xc-x,yc-y);

g.setColor(Color.yellow);

break;

case 6:g.drawString(".",xc-y,yc-x);

g.setColor(Color.orange);

break;

case 7:g.drawString(".",xc+x,yc-y);

g.setColor(Color.pink);

break;

case 8:g.drawString(".",xc+y,yc-x);

g.setColor(Color.magenta);

break;

}

}

check++;

if(check>8)

check=1;

increment+=1;

}

}

public void actionPerformed(ActionEvent aw)

{ 

repaint();

}

}