bool IsInside(scaled x0, scaled y0) const { return scaledIn(x0, x, x + width) && scaledIn(y0, y, y + height); }
bool IsInside(const scaled& x0, const scaled& y0) const { return x <= x0 && x0 <= x + width && y <= y0 && y0 <= y + height; }
  bool IsInside(scaled x0, scaled y0) const {    return      scaledIn(x0, x, x + width) &&      scaledIn(y0, y, y + height);  }