NAME
        SetOPen -- Change the Area OutLine pen and turn on Outline
                        mode for areafills.

   SYNOPSIS
        SetOPen(rp, pen)

        void SetOPen( struct rastport *, ubyte );

   FUNCTION
        This is implemented as a c-macro.
        Pen is the pen number that will be used to draw a border
        around an areafill during areaend().

   INPUTS
        rp = pointer to rastport structure
        pen = number  between 0-255

   BUGS

   SEE ALSO
        areaend() graphics/gfxmacros.h graphics/rastport.h