C    Copyright(C) 2014-2017 National Technology & Engineering Solutions of
C    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    Redistribution and use in source and binary forms, with or without
C    modification, are permitted provided that the following conditions are
C    met:
C    
C    * Redistributions of source code must retain the above copyright
C       notice, this list of conditions and the following disclaimer.
C    
C    * Redistributions in binary form must reproduce the above
C      copyright notice, this list of conditions and the following
C      disclaimer in the documentation and/or other materials provided
C      with the distribution.
C    
C    * Neither the name of NTESS nor the names of its
C      contributors may be used to endorse or promote products derived
C      from this software without specific prior written permission.
C    
C    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
C    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
C    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
C    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
C    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
C    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
C    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
C    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
C    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
C    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
C    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
C    

C $Id: getcrn.f,v 1.1 1990/11/30 11:07:56 gdsjaar Exp $
C $Log: getcrn.f,v $
C Revision 1.1  1990/11/30 11:07:56  gdsjaar
C Initial revision
C
C
CC* FILE: [.PAVING]GETCRN.FOR
CC* MODIFIED BY: TED BLACKER
CC* MODIFICATION DATE: 7/6/90
CC* MODIFICATION: COMPLETED HEADER INFORMATION
C
      SUBROUTINE GETCRN (MXND, MXCORN, MLN, LNODES, NCORN, LCORN,
     &   ANGLE, XN, YN, LXN, NLOOP, N1, ONLYC, PPOSBL, GRAPH, ERR)
C***********************************************************************
C
C  SUBROUTINE GETCRN = SETS UP ALL THE POSSIBLE CORNER (OR NON-SIDE)
C                      LOCATIONS IN THE MESH
C
C***********************************************************************
C
      DIMENSION LNODES (MLN, MXND), LCORN (MXCORN), ANGLE (MXND)
      DIMENSION XN (MXND), YN (MXND), LXN (4, MXND), X(1), Y(1)
C
      LOGICAL ONLYC, GRAPH, PPOSBL, ERR
C
      ERR = .FALSE.
C
C  COUNT THE CURRENT "POSSIBLE NON-SIDES" STARTING AT THE I COUNTER
C
      NODE = N1
      NOLD = N1
      KOUNTC = 0
      KOUNT = 0
      NCORN = 0
      PPOSBL = .TRUE.
  100 CONTINUE
      KOUNT = KOUNT + 1
      IF (KOUNT .GT. NLOOP) THEN
         CALL MESAGE ('PROBLEM IN GETCRN WITH UNCLOSED LOOP')
         ERR = .TRUE.
         GOTO 120
      ENDIF
C
C  CHECK IF A PRIMITIVE IS EVEN POSSIBLE HERE
C
      IF ( LNODES (6, NODE) .GT. 4) PPOSBL = .FALSE.
C
C  CHECK FOR A POSSIBLE "NON - SIDE" NODE
C
      IF (ONLYC) CALL NDSTAT (NODE, LXN (1, NODE), ANGLE (NODE), ISTAT)
C
C  A NEW "POSSIBLE NON-SIDE" NODE HAS BEEN FOUND
C
      IF ( ( (ONLYC) .AND. (ISTAT .EQ. 1) ) .OR.
     &   ( (.NOT. ONLYC) .AND. (LNODES (6, NODE) .NE. 3) ) ) THEN
         IF (GRAPH) THEN
            ISQR = NODE
            X(1) = XN (ISQR)
            Y(1) = YN (ISQR)
            IF ((ONLYC) .AND. (ISTAT .EQ. 1)) THEN
               CALL SYMBOL (1, X, Y, 'DIAMND')
            ELSEIF (.NOT. ONLYC) THEN
               IF (LNODES (6, NODE) .EQ. 1) THEN
                  CALL SYMBOL (1, X, Y, 'DIAMND')
               ELSEIF (LNODES (6, NODE) .EQ. 2) THEN
                  CALL SYMBOL (1, X, Y, 'CENTRX')
               ELSEIF (LNODES (6, NODE) .EQ. 4) THEN
                  CALL SYMBOL (1, X, Y, 'TRINGL')
               ELSE
                  CALL SYMBOL (1, X, Y, 'CIRCLE')
               ENDIF
            ENDIF
            CALL SFLUSH
         ENDIF
C
C  TOO MANY "NON-SIDES" HAVE BEEN FOUND - JUST PICK ONE AND GO
C
         IF (NCORN .EQ. MXCORN) THEN
            PPOSBL = .FALSE.
            DO 110 J = 1, NCORN
               IF (LNODES (6, LCORN (J)) .EQ. 1) THEN
                  NODE = J
                  IF (GRAPH) CALL LCOLOR ('WHITE')
                  GOTO 120
               ENDIF
  110       CONTINUE
            NODE = LCORN (1)
            IF (GRAPH) CALL LCOLOR ('WHITE')
            GOTO 120
         ENDIF
C
C  INPUT THIS "NON-SIDE"
C
         NCORN = NCORN + 1
         LCORN (NCORN) = NODE
C
C  ADD UP THE NUMBER OF NODES FROM THE LAST "NON-SIDE"
C
         IF (NCORN .GT. 1) THEN
            LNODES (7, LCORN (NCORN - 1)) = KOUNTC + 1
         ELSE
            KKC = KOUNTC + 1
         ENDIF
         KOUNTC = 0
C
C  THIS IS A SIDE - JUST CONTINUE
C
      ELSE
         KOUNTC = KOUNTC + 1
      ENDIF
C
C  CHECK FOR COMPLETION OF THE LOOP
C
      NODE = LNODES (3, NODE)
      IF (NODE .NE. NOLD) GOTO 100
C
C  GET THE FIRST CORNER'S DISTANCE FROM PREVIOUS CORNER CORRECT
C
      IF (NCORN .GE. 1) LNODES (7, LCORN (NCORN ) ) = KKC + KOUNTC
C
  120 CONTINUE
C
      RETURN
C
      END
