class Ball {
 
  float x, y;
  float xspeed, yspeed;
  color c;
  float r;
 
  Ball(float radius){
    c = color(255, 166, 0);
    r = radius;
    x = random(width);
    y = random(height);
    xspeed = random(1, 5);
    yspeed = random(1, 5);
  }
 
  void move(){
    x += xspeed;
    y += yspeed;
   
    if(x > width || x < 0) {
      xspeed *= -1;
    }
    if(y > height ||y < 0) {
      yspeed *= -1;
    }
  }
 
  void display() {
    fill(c);
    ellipse(x, y, r, r);
  }

}