rectangle in dc-path%

Closes the open sub-path, if any, and adds a closed path that represents a rectangle whose top-left corner is (x,y) and whose dimensions are width by height. (This convenience method is implemented in terms of close, move-to, and line-to.)

• (send a-dc-path rectangle x y width height) -> void
     x : real number
     y : real number
     width : non-negative real number
     height : non-negative real number