Fill Area draws an area which is specified by a polygon. The interior of the polygon can be either not filled (hollow), filled with a solid colour, or filled with various patterns. The fill area style and colour is specified by the current setting of the fill area colour index, fill area style and fill area style index attributes. The call is:
CALL GFA(N, PXA, PYA)where N, PXA, PYA have the same meaning as for GPL and GPM. If the first and last points are different, they are joined by a line.