int numballs = 40;
float [] x = new float [numballs];
float [] y = new float [numballs];
float [] speedX = new float [numballs];
float [] speedY = new float [numballs];
int limite;
float[] diameter= new float [numballs];

void setup() {
  size (600, 600);
  fill (255, 150, 0);
  noStroke();
  for (int i = 0; i < numballs; i++) {
    x[i] = random(width);
    y[i] = random (height);
    speedX[i] = random (-5, 5);
    speedY[i] =  random (-5, 5);
    diameter [i]=random(5, 20);
   
  }
}
void draw () {
  background(0);
  for (int i=0; i< numballs; i++) {
    x[i] += speedX[i];
    if (x[i]< 0 || x[i] > width) {
      speedX[i] *= -1;
    }
    y[i] += speedY[i];
    if (y[i] <0 ||y[i] > height) {
      speedY[i] *= -1;
   }
    
    limite += 10;
    if (limite > width){
      limite = 10;
    }
    saveFrame();
    fill(random(255), random(255), random(255));
    ellipse (x[i], y[i], diameter[i], diameter[i]);
    //saveFrame();
  }
}