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41 lines
1.4 KiB
41 lines
1.4 KiB
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 EXTND3 (MXND, XN, YN, ANGLE, N1, N2, N3, X, Y, DIST)
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C***********************************************************************
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C SUBROUTINE EXTND3 = CALCULATES TWO POSITIONS AN AVERAGE LENGTH AWAY
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C FROM A CORNER NODE AND ONE AT 1/3 ANGLE INTERVALS
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C***********************************************************************
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DIMENSION XN (MXND), YN (MXND)
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DIMENSION X(3), Y(3)
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ANG = ATAN2 (YN (N1) - YN (N2), XN (N1) - XN (N2))
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CANG = ANGLE / 3.
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ANG1 = ANG - CANG
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ANG2 = ANG - (ANGLE * .5)
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ANG3 = ANG - 2. * CANG
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DIST1 = SQRT ((YN (N2) - YN (N1)) **2 + (XN (N2) - XN (N1)) **2)
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DIST2 = SQRT ((YN (N3) - YN (N2)) **2 + (XN (N3) - XN (N2)) **2)
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DIST = (DIST1 + DIST2) * .5
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IF (CANG. EQ. 0.) THEN
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ADIST = DIST
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ELSE
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ADIST = DIST / SIN (CANG)
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ENDIF
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X(1) = ADIST * COS (ANG1) + XN (N2)
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Y(1) = ADIST * SIN (ANG1) + YN (N2)
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X(2) = 1.4142 * ADIST * COS (ANG2) + XN (N2)
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Y(2) = 1.4142 * ADIST * SIN (ANG2) + YN (N2)
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X(3) = ADIST * COS (ANG3) + XN (N2)
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Y(3) = ADIST * SIN (ANG3) + YN (N2)
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RETURN
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END
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