Certain drawing functions can draw either an area or the outline of that area. This is controlled by the :filled keyword argument to these functions. If the value is t (the default), then the function paints the entire area. If the value is nil , then the function outlines the area under the control of the line-style drawing option.
The :filled keyword argument is not a drawing option and cannot be specified to with-drawing-options .
The following functions have a :filled keyword argument: