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SETPPO

       SUBROUTINE  SETPPO (XNDC,YNDC)
 C$    (Set Polygon Pixel Pattern Origin)
 C$    Set the  polygon pixel  pattern origin.   This is  used  to
 C$    determine the  initial position  of a  pixel pattern  array
 C$    used for filling a  polygon of interior style  "patterned".
 C$    The arguments are:
 C$
 C$    (XNDC,YNDC)......Normalized device coordinates of origin of
 C$                     lower left  corner of  the pixel  pattern.
 C$                     They must lie in the range 0.0..1.0,  with
 C$                     the default value if  this routine is  not
 C$                     called being at (0.0,0.0), the  lower-left
 C$                     corner of the display surface.
 C$    (27-JAN-82)