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.*;
import java.awt.event.*;
import java.awt.image.ImageObserver;


public class Futbol extends Applet implements Runnable, ActionListener{

Balon v[];
int cont;
Image campo;
Image aux;
Image panelIzquierdo;
Thread t;
List lstBalon;
TextField txtAncho,
  txtAlto,
  txtVelocidad,
  txtX,
  txtY,
  txtDireccion;
Button    cmdAgregar,
  cmdEliminar;
CheckboxGroup cbgTipo;
Checkbox    chkBalon1,
chkBalon,
chkBalon2,
chkBalon3;


public void init(){
cont = 0;
v = new Balon [1000];
setLayout(new BorderLayout());
setSize(840, 407);
//Crear el panel Derecho
Panel panelDerecho = new Panel();
panelDerecho.setBackground(Color.gray);
panelDerecho.setPreferredSize(new Dimension(200, 400));
//Añadir la etiqueta "Balones" al panel derecho
Label lblAux = new Label("Balones");
lblAux.setPreferredSize(new Dimension(200, 20));
lblAux.setAlignment(Label.CENTER);
panelDerecho.add(lblAux);
//Añadir la lista para las balones al panel derecho
lstBalon = new List();
lstBalon.setPreferredSize(new Dimension(170, 170));
panelDerecho.add(lstBalon);
//Añadir campos de datos
txtX = agregarTextField(panelDerecho, "X");
txtY = agregarTextField(panelDerecho, "Y");
txtVelocidad = agregarTextField(panelDerecho, "Velocidad");
txtDireccion = agregarTextField(panelDerecho, "Dirección");



//Añadir tipo de balon
cbgTipo = new CheckboxGroup();
chkBalon= new Checkbox ("Normal", cbgTipo, true);
chkBalon.setPreferredSize(new Dimension(70, 20));
panelDerecho.add(chkBalon);
chkBalon1 = new Checkbox ("R.Madrid", cbgTipo, false);
chkBalon1.setPreferredSize(new Dimension(70, 20));
panelDerecho.add(chkBalon1);
chkBalon2 = new Checkbox ("AtlMadrid", cbgTipo, false);
chkBalon2.setPreferredSize(new Dimension(70, 20));
panelDerecho.add(chkBalon2);
chkBalon3 = new Checkbox ("Barça", cbgTipo, false);
chkBalon3.setPreferredSize(new Dimension(70, 20));
panelDerecho.add(chkBalon3);
//Añadir botones
cmdAgregar = new Button("Agregar");
cmdAgregar.addActionListener(this);
cmdEliminar = new Button("Eliminar");
cmdEliminar.addActionListener(this);
cmdAgregar.setPreferredSize(new Dimension (90, 30));
cmdEliminar.setPreferredSize(new Dimension (90, 30));
panelDerecho.add(cmdAgregar);
panelDerecho.add(cmdEliminar);
//Añadir el panel Derecho al Applet
add(panelDerecho, BorderLayout.EAST);
//Crear el panel izquierdo
campo = getImage(getCodeBase(), "img/campo.png");
aux = createImage(640, 407);

}

public TextField agregarTextField(Panel p, String e){
Label lblAux= new Label(e);
TextField txtAux = new TextField();
lblAux.setPreferredSize(new Dimension (90, 20));
txtAux.setPreferredSize(new Dimension (90, 20));
p.add(lblAux);
p.add(txtAux);
return txtAux;
}

public Choice agregarChoice(Panel p, String e){
Label lblAux= new Label(e);
Choice cboAux = new Choice();
lblAux.setPreferredSize(new Dimension (90, 20));
cboAux.setPreferredSize(new Dimension (90, 20));
p.add(lblAux);
p.add(cboAux);
return cboAux;
}

public void start(){
t = new Thread(this);
if (t != null) t.start();
}


public void run(){
while (true){
repaint ();
for (int i=0; i<cont; i++)
v[i].mover(0, 0, 639, 406);
try {
Thread.sleep(40);
} catch (Exception e) {

}
}
}

public void actionPerformed(ActionEvent e){
if (e.getSource() == cmdAgregar){
Balon aux;
if(cbgTipo.getSelectedCheckbox()== chkBalon) {
lstBalon.add("Normal");
aux = new Balon(getImage (getCodeBase(), "img/balon0.png"),
Integer.parseInt(txtX.getText()),
Integer.parseInt(txtY.getText()),
Integer.parseInt(txtVelocidad.getText()),
Integer.parseInt(txtDireccion.getText()),this);
}
else if(cbgTipo.getSelectedCheckbox()== chkBalon1) {
lstBalon.add("R.Madrid");
aux = new Balon (getImage (getCodeBase(), "img/balon1.png"),
Integer.parseInt(txtX.getText()),
Integer.parseInt(txtY.getText()),
Integer.parseInt(txtVelocidad.getText()),
Integer.parseInt(txtDireccion.getText()),this);
}
else if(cbgTipo.getSelectedCheckbox()== chkBalon2) {
lstBalon.add("AtlMadrid");
aux = new Balon (getImage (getCodeBase(), "img/balon2.png"),
Integer.parseInt(txtX.getText()),
Integer.parseInt(txtY.getText()),
Integer.parseInt(txtVelocidad.getText()),
Integer.parseInt(txtDireccion.getText()),this);
}
else {
lstBalon.add("Barça");
aux=new Balon (getImage (getCodeBase(), "img/balon3.png"),
Integer.parseInt(txtX.getText()),
Integer.parseInt(txtY.getText()),
Integer.parseInt(txtVelocidad.getText()),
Integer.parseInt(txtDireccion.getText()),this);
}
//Añadir el balon
agregarBalon(aux);
}
else if (e.getSource() == cmdEliminar){
int i =lstBalon.getSelectedIndex();
if (i>=0){
eliminarBalon(i);
lstBalon.remove(i);
}
}
}

public  boolean agregarBalon(Balon b){
if (cont == 1000)
return false;
else{
v[cont ++] = b;
return true;
}
}

public boolean eliminarBalon(int i){
if (cont == 0 || i >= cont)
return false;
else{
for (int j=i; j<cont; j++)
v[j] = v[j+1];
cont--;
return true;
}
}

public void update (Graphics g){
paint (g);
}

public void paint(Graphics g){
aux.getGraphics().drawImage(campo, 0, 0, this);
for (int i=0; i<cont; i++)
v[i].paint(aux.getGraphics());
g.drawImage(aux, 0, 0, this);
}

}