sclass BoundsFinder {
  int x1 = Int.MAX_VALUE, y1 = Int.MAX_VALUE, x2 = 0, y2 = 0;
  
  *() {}
  *(int w, int h) { x1 = w; y1 = h; }
  
  void addPt aka add(Pt p) {
    if (p != null) addPt(p.x, p.y);
  }
  
  void addPt aka add(int x, int y) {
    if (x < x1) x1 = x;
    if (x > x2) x2 = x;
    if (y < y1) y1 = y;
    if (y > y2) y2 = y;
  }
  
  Rect get() {
    ret rectFromPointsOrNull(x1, y1, x2+1, y2+1);
  }
}