// au hasard entre 10 et 290
int x=int(random(10,290));
int y=int(random(10,290));
 // au hasard entre 5 et 10 ou entre -5 et -10
int vitx = int(random(5))+5*((round(random(1))*2)-1);
int vity = int(random(5))+5*((round(random(1))*2)-1);

// Initialise le sketch
void setup(){
  size (300,300);
  noStroke();
  framerate(30);
  fill(random(255),random(255),random(255),random(64,192));
  background(51);
  smooth();
}



//procˇdure d'affichage
void draw(){

  ellipse(x, y,20,20);
x += vitx;
  if(x >= width) {
    vitx = -vitx;
    vity = int(random(5))+5*((round(random(1))*2)-1);
    fill(random(255),random(255),random(255),random(64,192));
  }else if(x <= 0){
    vitx = -vitx;
    vity = int(random(5))+5*((round(random(1))*2)-1);
    fill(random(255),random(255),random(255),random(64,192));
}
y += vity;
  if(y >= height) {
    vity = -vity;
    vitx = int(random(5))+5*((round(random(1))*2)-1);
    fill(random(255),random(255),random(255),random(64,192));
  }else if(y <= 0){
    vity = -vity;
    vitx = int(random(5))+5*((round(random(1))*2)-1);
    fill(random(255),random(255),random(255),random(64,192));
}
}