import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;

public class Balon {
	
	int x, y, vx, vy, v;
	double d;
	Image img;
	ImageObserver io;
	
	
	public Balon(Image img, int x, int y,int v, 
			double d, ImageObserver io){
	
		this.x = x;
		this.y = y;
		this.v = v;
		this.d = d;
		this.img = img;
		this.io = io;
		vx = v - (int)Math.round(Math.cos(d));
		vy = v - (int)Math.round(Math.sin(d));
		
	}
	
	public void mover (int minX,int minY,int maxX,int maxY){
		x += vx;
		y += vy;
		
		if (x + img.getWidth(io) > maxX){
			x = maxX-img.getWidth(io) ;
			vx = -vx;
		}else if (x < 0){
			x = 0;
			vx = -vx;
		}

		if (y + img.getHeight(io)> maxY){
			y = maxY-img.getHeight(io);
			vy = -vy;
		}else if (y < 0){
			y = 0;
			vy = -vy;
		}
	}
	public void paint (Graphics g){
		g.drawImage(img, x, y, io);
	}
}

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;


public class Futbol extends Applet implements Runnable {

	Image campo, aux;
	Balon balon, balon1, balon2, balon3;
	Thread t;
	
	public void  init(){
		setSize (640, 407);
		campo = getImage(getCodeBase(), "img/campo.png");
		aux = createImage(640,407);
		balon = new Balon (getImage (getCodeBase(), "img/balon0.png"),
				270, 153, 5, 2 * Math.PI * 45 / 360, this);
		balon1 = new Balon (getImage (getCodeBase(), "img/balon1.png"),
				0, 0, 5, 2 * Math.PI * 307 / 360, this);
		balon2 = new Balon (getImage (getCodeBase(), "img/balon2.png"),
				0, 300, 5, 2 * Math.PI * 103 / 360, this);
		balon3 = new Balon (getImage (getCodeBase(), "img/balon3.png"),
				540, 0, 5, 2 * Math.PI * 200 / 360, this);}
		

	public void  start(){
		t = new Thread(this);
		if(t != null) t.start();	
	}
	
	
	public void run (){
		while (true){
			repaint ();
			balon.mover(0, 0, 639, 406);//*Blanco y negro movimiento
			balon1.mover(0, 0, 639, 406);//*Madrid movimiento
			balon2.mover(0, 0, 639, 406);//*Athletico de madrid movimiento
			balon3.mover(0, 0, 639,406 );//*Barça movimiento
			try{
			Thread.sleep(40);//*Velocidad/
			}catch (Exception e){
				
			}
		}
	}
	public void update(Graphics g){
		paint (g);
	}
	
	public void paint (Graphics g){
		
		aux.getGraphics().drawImage(campo, 0, 0, this);
		balon.paint(aux.getGraphics());
		balon1.paint(aux.getGraphics());
		balon2.paint(aux.getGraphics());
		balon3.paint(aux.getGraphics());
		g.drawImage(aux, 0, 0, this);
	}
}