NAME
    AreaDraw -- Add a point to a list of end points for areafill.
SYNOPSIS
    error = AreaDraw( rp,  x,     y)
      d0              A1 D0:16 D1:16
    ULONG AreaDraw( struct RastPort *, SHORT, SHORT);
FUNCTION
    Add point to the vector buffer.
INPUTS
    rp      - points to a RastPort structure.
    x,y     - are coordinates of a point in the raster.
RESULT
    error   - zero for success, else -1 if no there was no space
              left in the vector list.
BUGS
SEE ALSO
    AreaMove() InitArea() AreaEnd() graphics/rastport.h