Set dimensions to empty, or to (Interval (0, 0), Interval (0, 0) */
void set_empty (bool);
void add_at_edge (Axis a, Direction d, const Stencil &m, Real padding);
+ void stack (Axis a, Direction d, const Stencil &m, Real padding, Real mindist);
void add_stencil (Stencil const &m);
void translate (Offset);
Stencil translated (Offset) const;
Interval extent (Axis) const;
Box extent_box () const;
bool is_empty () const;
+ bool is_empty (Axis) const;
Stencil in_color (Real r, Real g, Real b) const;
static SCM skylines_from_stencil (SCM, Real, Axis);
};