Library /sys$common/syshlp/basichelp.hlb
Graphics, LOCATE_POINT

 *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A LOCATE POINT statement accepts a single point input by a user.  Points
  accepted  with  the  LOCATE  POINT  statement  are  not  affected by the
  transformation function associated with the DRAW statement.   The  input
  point  is  transformed  according to the transformation for the viewport
  that the point falls into.  If the point falls into an area  where  more
  than  one  viewport is valid, VAX BASIC uses the transformation with the
  highest priority.

  Example

   OPTION TYPE = EXPLICIT
   EXTERNAL PICTURE boat(SINGLE,)
   DECLARE LONG alt_tran,which_tran,                  &
           REAL user_x, user_y
   !+
   !Specify alternative transformation for initial point
   !-
   alt_tran = 2
   !+
   !Request coordinate pair from user and offer default point
   !-
   LOCATE POINT , AT 50,50 USING TRAN alt_tran : user_x, user_y , &
                  which_tran

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