class Ball {
  
  float x, y;
  float vx, vy;
  float radius;
  
  Ball (int ix, int iy, float ivx, float ivy, float iradius) {
    x = ix;
    y = iy;
    vx = ivx;
    vy = ivy;
    radius = iradius;
  }
  
  void update() {
    y += vy;
    x += vx;
  }
  
  void display() {
    ellipse(x, y, radius*2, radius*2);
  }
}