sketch_141117a

float posX, posY, velX, velY;

int sz = 20;

​

int totalRebots = 0;

​

void setup() {

  size(300,200);

  posX = width/2;

  posY = height/2;

  velX = random(8,15);

  velY = random(8,15);

}

​

void draw() {

background(0); 

actualizaPosiciones();

cuentaRebotes();

dibujaBola();

​

}

void actualizaPosiciones() {

  posX = posX+velX;

  posY = posY+velY;

}

​

void dibujaBola()

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{

 fill(255);

 ellipse(posX,posY,totalRebots,totalRebots);

}

​

void cuentaRebotes(){

if((posX<0)||(posX>width)) {

    velX = -velX;

    totalRebots ++;

  } 

  if((posY<0)||(posY>height)) {

    velY = -velY;

    totalRebots ++;

  } 

  fill(127);

  text (totalRebots, 15, height-15);

}

​

​

​

​

​

​

​