Java applet: StarApplet

Java source code

import java.applet.* ;
import java.awt.* ;

// applet
public class StarApplet extends Applet {
	private Star star;
	public void init() {
		setBackground( Color.white );
		star = new Star( getGraphics() );
		}
	public void paint( Graphics g ) {
		double tmp;
		int x, y, steps, unit ;
		//for( int i = 0 ; i < 5 ; i ++ ) {
		while( true ) {
			// random x-coordinate
			tmp = Math.random() * 78 ; x = (int) tmp;
			tmp = Math.random() * 86 ; y = (int) tmp;
			tmp = Math.random() * 15 ; steps = (int) tmp + 3;
			tmp = Math.random() * 10 ; unit = (int) tmp + 10;
			//System.out.println(" x = " + x + ", y = " + y + ", steps = " + steps + ", unit = " + unit);
			star.draw(x, y, steps, unit);
			//sleep( 200 );
			}
		}
	public void pauze( int millisec ) {
		try { Thread.sleep( millisec ); }
		catch( InterruptedException e ) { }
		}
	}

// star
class Star {
	private Graphics g;
	
	// default constructor
	public Star( Graphics g ) {
		this.g = g;
		}

	// draw a star
	public void draw(int a, int b, int steps, int unit) {
		int x1 = a, 
		    x2 = a + (steps * unit), 
			y1 = b + (steps * unit), 
			y2 = b + (steps * unit), 
			opY = -1 ,
			opX = 1 ;
		g.setColor( Color.blue );
		for( int i = 0 ; i <= steps * 4 ; i++ ) {
			g.drawLine( x1, y1, x2, y2) ;
			pauze( 100 ) ;
			x1 = x1 + ( opX * unit );
			y2 = y2 + ( opY * unit );
			if( y2 == b ) { opY = 1; }
			if( x1 == a + (steps * unit)*2  ) { opX = -1; }
			if( y2 == b + (steps * unit)*2 ) { opY = -1; }
			}
		x1 = a ;
		y2 = b + (steps * unit) ; 
		opY = -1 ;
		opX = 1 ;
		g.setColor( Color.white );
		for( int i = 0 ; i <= steps * 4 ; i++ ) {
			g.drawLine( x1, y1, x2, y2) ;
			pauze( 100 ) ;
			x1 = x1 + ( opX * unit );
			y2 = y2 + ( opY * unit );
			if( y2 == b ) { opY = 1; }
			if( x1 == a + (steps * unit)*2  ) { opX = -1; }
			if( y2 == b + (steps * unit)*2 ) { opY = -1; }
			}
		}

	// sleep
	public void pauze( int millisec ) {
		try { Thread.sleep( millisec ); }
		catch( InterruptedException e ) { }
		}
	}