sclass DoubleRect {
  double x, y, w, h;
  
  *() {}
  *(Rectangle r) {
    x = r.x;
    y = r.y;
    w = r.width;
    h = r.height;
  }
  *(double *x, double *y, double *w, double *h) {}
  
  // Huh. not implementing equals()/hashCode? Stefan is mysterious
  bool eq(O o) {
    if (!o instanceof DoubleRect) false;
    if (o == this) true;
    DoubleRect r = cast o;
    ret x == r.x && y == r.y && w == r.w && h == r.h;
  }
  
  toString {
    ret x + "," + y + " / " + w + "," + h;
  }
  
  double x1() { ret x; }
  double y1() { ret y; }
  double x2() { ret x + w; }
  double y2() { ret y + h; }
  
  bool contains(Pt p) {
    ret contains(p.x, p.y);
  }
  
  bool contains(double _x, double _y) {
    ret _x >= x && _y >= y && _x < x+w && _y < y+h;
  }
  
  bool empty() { ret w <= 0 || h <= 0; }
}