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43 lines
1.2 KiB
43 lines
1.2 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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C=======================================================================
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SUBROUTINE PLTARR(XTAIL,YTAIL,XHEAD,YHEAD,THETA,ARRLEN)
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REAL XTAIL,YTAIL
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REAL XHEAD,YHEAD
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REAL THETA
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REAL ARRLEN
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DATA SMALL/1.E-3/
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IF (ABS(XTAIL-XHEAD).LE.SMALL .AND.
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* ABS(YTAIL-YHEAD).LE.SMALL) THEN
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RETURN
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END IF
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CALL PLTVCT(1,XTAIL,YTAIL,XHEAD,YHEAD)
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IF (ARRLEN.LE.0.) THEN
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RETURN
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END IF
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DX = XHEAD - XTAIL
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DY = YHEAD - YTAIL
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ALPHA = ATAN2(DY,DX)
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A = -ARRLEN*COS(ALPHA)*COS(THETA) + ARRLEN*SIN(ALPHA)*SIN(THETA) +
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* XHEAD
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B = -ARRLEN*COS(ALPHA)*SIN(THETA) - ARRLEN*SIN(ALPHA)*COS(THETA) +
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* YHEAD
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CALL PLTVCT(1,XHEAD,YHEAD,A,B)
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A = -ARRLEN*COS(ALPHA)*COS(-THETA) +
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* ARRLEN*SIN(ALPHA)*SIN(-THETA) + XHEAD
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B = -ARRLEN*COS(ALPHA)*SIN(-THETA) -
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* ARRLEN*SIN(ALPHA)*COS(-THETA) + YHEAD
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CALL PLTVCT(1,XHEAD,YHEAD,A,B)
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RETURN
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END
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