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68 lines
1.7 KiB
68 lines
1.7 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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SUBROUTINE CLOSEG (MSNAP, SNAPDX, NSNAP, X, Y, II, INDEX, XBOT,
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& XTOP, YBOT, YTOP)
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C***********************************************************************
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C SUBROUTINE CLOSEG = SUBROUTINE TO RETURN CLOSEST GRID LINE
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C***********************************************************************
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C SUBROUTINE CALLED BY:
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C DIGIT = A SUBROUTINE TO INPUT GEOMETRY
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C***********************************************************************
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C VARIABLES USED:
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C X = THE X LOCATION IN USER COORDINATES
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C Y = THE Y LOCATION IN USER COORDINATES
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C***********************************************************************
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DIMENSION SNAPDX(2, MSNAP), NSNAP(2)
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C FIND CLOSEST GRID CROSSING IN X OR Y
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XHOLD = X
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YHOLD = Y
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CALL SNAPPT (MSNAP, SNAPDX, NSNAP, XHOLD, YHOLD)
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IF (ABS(XHOLD - X) .LT. ABS(YHOLD - Y)) THEN
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INDEX = 1
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ELSE
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INDEX = 2
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XHOLD = YHOLD
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END IF
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C FIND INDEX TO GRID LINE
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DO 100 I = 1, NSNAP(INDEX)
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IF (SNAPDX(INDEX, I) .GE. XHOLD) THEN
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II = I
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GO TO 110
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END IF
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100 CONTINUE
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II = NSNAP(INDEX)
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110 CONTINUE
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C SET GRID LINE LIMITS
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IF (INDEX .EQ. 1) THEN
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XBOT = SNAPDX(1, II)
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XTOP = XBOT
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YBOT = SNAPDX(2, 1)
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YTOP = SNAPDX(2, NSNAP(2))
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ELSE
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XBOT = SNAPDX(1, 1)
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XTOP = SNAPDX(1, NSNAP(1))
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YBOT = SNAPDX(2, II)
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YTOP = YBOT
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END IF
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RETURN
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END
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