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 ADDTUK (MXND, MLN, NUID, XN, YN, ZN, LXK, KXL, NXL,
     &   LXN, LNODES, ANGLE, NLOOP, IAVAIL, NAVAIL, LLL, KKK, NNN, TANG,
     &   KANG, NSTART, NEND, NODE, XMIN, XMAX, YMIN, YMAX, ZMIN, ZMAX,
     &   GRAPH, VIDEO, DEV1, NOROOM, ERR)
C***********************************************************************

C  SUBROUTINE ADDTUK = ADDS TUCKS IN A ROW

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

C  ADD TUCKS BASED ON THE TOTAL TURNED ANGLE:
C      FOR TURNING ANGLES LESS THAN 135 DEGREES - 1 TUCK
C      FOR TURNING ANGLES BETWEEN 135 AND 225 DEGREES - TRY 2 TUCKS
C      FOR TURNING ANGLES BETWEEN 225 AND 315 DEGREES - TRY 3 TUCKS
C      FOR TURNING ANGLES GREATER THAN 315 DEGREES - TRY 4 TUCKS

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

      DIMENSION XN (MXND), YN (MXND), ZN (MXND), NUID (MXND)
      DIMENSION LXK (4, MXND), KXL (2, 3*MXND)
      DIMENSION NXL (2, 3*MXND), LXN (4, MXND)
      DIMENSION LNODES (MLN, MXND), ANGLE (MXND)
      DIMENSION INODE (4)

      LOGICAL GRAPH, ERR, MAXSIZ, VIDEO, NOROOM

      CHARACTER*3 DEV1

      ERR = .FALSE.
      MAXSIZ = .FALSE.

      IF (TANG .LT. 2.3561945) THEN
         NWANT = 1
      ELSEIF (TANG .LT. 3.9269908) THEN
         IF (KANG .GT. 2) THEN
            NWANT = 2
         ELSE
            NWANT = 1
         ENDIF
      ELSEIF (TANG .LT. 5.4977871) THEN
         IF (KANG .GT. 4) THEN
            NWANT = 3
         ELSEIF (KANG .GT. 2) THEN
            NWANT = 2
         ELSE
            NWANT = 1
         ENDIF
      ELSE
         IF (KANG .GT. 6) THEN
            NWANT = 4
         ELSEIF (KANG .GT. 4) THEN
            NWANT = 3
         ELSEIF (KANG .GT. 2) THEN
            NWANT = 2
         ELSE
            NWANT = 1
         ENDIF
      ENDIF

      CALL NSPLIT (MXND, MLN, LNODES, ANGLE, NSTART, KANG, INODE,
     &   NNODE, NWANT, MAXSIZ)

      DO 100 I = 1, NNODE
         IF (LXN (1, I) .GT. 0) THEN

C  MARK THE SMOOTHING

            CALL MARKSM (MXND, MLN, LXK, KXL, NXL, LXN, LNODES,
     &         LNODES (2, INODE(I)), ERR)
            IF (ERR) GOTO 110
            CALL MARKSM (MXND, MLN, LXK, KXL, NXL, LXN, LNODES,
     &         LNODES (2, LNODES (2, INODE(I))), ERR)
            IF (ERR) GOTO 110
            CALL MARKSM (MXND, MLN, LXK, KXL, NXL, LXN, LNODES,
     &         LNODES (3, INODE(I)), ERR)
            IF (ERR) GOTO 110
            CALL MARKSM (MXND, MLN, LXK, KXL, NXL, LXN, LNODES,
     &         LNODES (3, LNODES (3, INODE(I))), ERR)
            IF (ERR) GOTO 110
            CALL MARKSM (MXND, MLN, LXK, KXL, NXL, LXN, LNODES,
     &         LNODES (3, LNODES (3, LNODES (3, INODE(I)))), ERR)
            IF (ERR) GOTO 110

C  MAKE SURE THAT THE NSTART, NEND, AND NODE GET UPDATED IF THEY ARE TO
C  BE DELETED

            IF ( (INODE(I) .EQ. NSTART) .OR.
     &         (LNODES (3, INODE(I)) .EQ. NSTART)) THEN
               NSTART = LNODES (3, LNODES (3, INODE(I)))
            ENDIF
            IF ( (INODE(I) .EQ. NEND) .OR.
     &         (LNODES (3, INODE(I)) .EQ. NEND) ) THEN
               NEND = LNODES (3, LNODES (3, INODE(I)))
            ENDIF
            IF ( (INODE(I) .EQ. NODE) .OR.
     &         (LNODES (3, INODE(I)) .EQ. NODE) ) THEN
               NODE = LNODES (3, LNODES (3, INODE(I)))
            ENDIF

C  TAKE THE TUCK

            CALL TUCK (MXND, MLN, NUID, XN, YN, LXK, KXL, NXL, LXN,
     &         LNODES, IAVAIL, NAVAIL, LLL, KKK, NNN, INODE (I), NLOOP,
     &         GRAPH, NOROOM, ERR)
            IF ((NOROOM) .OR. (ERR)) GOTO 110
            IF (VIDEO) THEN
               CALL RPLOTL (MXND, XN, YN, ZN, NXL, XMIN, XMAX, YMIN,
     &            YMAX, ZMIN, ZMAX, LLL, DEV1, KREG)
               CALL SNAPIT (1)
            ENDIF
         ENDIF
  100 CONTINUE

  110 CONTINUE

      RETURN

      END