C    Copyright(C) 1999-2020 National Technology & Engineering Solutions
C    of Sandia, LLC (NTESS).  Under the terms of Contract DE-NA0003525 with
C    NTESS, the U.S. Government retains certain rights in this software.
C
C    See packages/seacas/LICENSE for details

      SUBROUTINE INITDG (MCOM, ICOM, JCOM, CIN, RIN, IIN, KIN, IDUMP,
     &   XX1, YY1, SCALE, CT, ST, X1, X2, Y1, Y2, DRWTAB, SNAP)
C***********************************************************************

C  SUBROUTINE INITDG = INITIALIZES THE DIGITIZING TABLET

C***********************************************************************

      DIMENSION KIN (MCOM), IIN (MCOM), RIN (MCOM)

      CHARACTER * 72 CIN (MCOM), BUTTON * 1

      LOGICAL DRWTAB, IANS, SNAP

      IZ = 0

C  CHECK TO MAKE SURE THAT THE DRAWING IS NOT BEING TOGGLED

      IF (DRWTAB) THEN
         CALL MESSAGE('DRAWING INITIALIZATION IS ALREADY ACTIVE')
         CALL INTRUP  ('TOGGLE ALL DRAWING INITIALIZATION OFF',
     &      IANS,  MCOM,  ICOM,  JCOM,  CIN,  IIN,  RIN,  KIN)
         IF (IANS) THEN
            DRWTAB = .FALSE.
            CALL TABINT (X1, X2, Y1, Y2, CT, ST, SCALE, XX1, YY1, XX2,
     &         YY2, DRWTAB)
            RETURN
         ENDIF
      ENDIF

C  GET THE ZOOM LIMITS

      CALL MESSAGE(' ')
      IF (ICOM .GT. JCOM) THEN
         CALL FREFLD (IZ, IZ, 'ENTER DRAWING XMIN, XMAX, YMIN, YMAX:',
     &      MCOM, IOSTAT, JCOM, KIN, CIN, IIN, RIN)
         ICOM = 1
      ENDIF
      IF ( (JCOM - ICOM + 1) .GE. 4) THEN
         SNAP = .TRUE.
         X1 = RIN (ICOM)
         X2 = RIN (ICOM + 1)
         Y1 = RIN (ICOM + 2)
         Y2 = RIN (ICOM + 3)
         ICOM = ICOM + 4
      ELSE
         CALL MESSAGE('NOT ENOUGH INFORMATION DEFINED TO SPECIFY'//
     &      ' DRAWING LIMITS')
         CALL MESSAGE('INITIALIZATION ABORTED')
         CALL MESSAGE(' ')
         RETURN
      ENDIF

C  GET THE DIGITIZING POINTS

      CALL MESSAGE('NOW DIGITIZE THOSE 2 POINTS')
      CALL MESSAGE('       PUSH "PUCK - 1" FOR LOWER LEFT')
      CALL MESSAGE('       PUSH "PUCK - 2" FOR UPPER RIGHT')
      CALL MESSAGE('       PUSH "PUCK - E" TO END')
  100 CONTINUE
      CALL DPREAD (X, Y, BUTTON)
      IF (BUTTON .EQ. '1') THEN
         XX1 = X
         YY1 = Y
         CALL MESSAGE('LOWER LEFT INPUT')
         GOTO 100
      ELSEIF (BUTTON .EQ. '2') THEN
         XX2 = X
         YY2 = Y
         CALL MESSAGE('UPPER RIGHT INPUT')
         GOTO 100
      ELSEIF (BUTTON .EQ. 'E') THEN
         CALL PLTBEL
         CALL PLTFLU
      ENDIF
      IF ( ( (YY2 - YY1 .EQ. 0.) .AND. (XX2 - XX1 .EQ. 0.))
     &   .OR. ( (Y2 - Y1 .EQ. 0.) .AND. (X2 - X1 .EQ. 0.))) THEN
         CALL MESSAGE('BAD INITIALIZATION  -  INITIALIZATION ABORTED')
         CALL MESSAGE(' ')
         CALL PLTBEL
         CALL PLTFLU
         RETURN
      ENDIF
      DRWTAB = .TRUE.
      CALL TABINT (X1, X2, Y1, Y2, CT, ST, SCALE, XX1, YY1, XX2, YY2,
     &   DRWTAB)
      CALL MESSAGE('INITIALIZATION COMPLETE')
      CALL MESSAGE(' ')

      RETURN

      END