final srecord Rect(int x, int y, int w, int h) {
  *(Rectangle r) {
    x = r.x;
    y = r.y;
    w = r.width;
    h = r.height;
  }
  
  *(Pt p, int *w, int *h) { x = p.x; y = p.y; }
  *(Rect r) { x = r.x; y = r.y; w = r.w; h = r.h; }
  
  Rectangle getRectangle() {
    ret new Rectangle(x, y, w, h);
  }
  
  public S toString() {
    ret x + "," + y + " / " + w + "," + h;
  }
  
  int x1() { ret x; }
  int y1() { ret y; }
  int x2() { ret x + w; }
  int y2() { ret y + h; }
  
  bool contains(Pt p) {
    ret contains(p.x, p.y);
  }
  
  bool contains(int _x, int _y) {
    ret _x >= x && _y >= y && _x < x+w && _y < y+h;
  }
  
  bool empty() { ret w <= 0 || h <= 0; }
}