stencil.add_stencil (top_edge);
Bezier inner_bottom_curve = bottom_curve;
inner_bottom_curve.translate (Offset (0.0, +line_thickness));
Stencil bottom_edge
stencil.add_stencil (top_edge);
Bezier inner_bottom_curve = bottom_curve;
inner_bottom_curve.translate (Offset (0.0, +line_thickness));
Stencil bottom_edge