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121 lines
3.6 KiB
121 lines
3.6 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 EQLANG (MXND, XN, YN, LXN, NODE, N0, N2, NFROM, DIST,
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& VRO, XDEL, YDEL)
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C***********************************************************************
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C SUBROUTINE EQLANG = CALCULATES A VECTOR SUM THAT ATTEMPTS TO
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C MAINTAIN EQUAL ANGLES FOR A NODE
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C***********************************************************************
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DIMENSION XN(MXND), YN(MXND), LXN(4, MXND)
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LOGICAL EXPAND
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PI = ATAN2(0.0, -1.0)
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TWOPI = 2.0 * PI
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IF (NFROM .GT. 0) THEN
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C TEST FOR THE EXPANSION CASE
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IF ( ( ((LXN (4, NFROM) .NE. 0) .AND.
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& (LXN (2, NFROM) .LT. 0)) .OR.
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& ((LXN (4, NFROM) .LT. 0) .AND.
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& (LXN (2, NFROM) .GT. 0)) )
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& .AND.
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& ((LXN (3, N0) .EQ. 0) .OR. (LXN (3, N2) .EQ. 0)) ) THEN
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EXPAND = .TRUE.
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ELSE
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EXPAND = .FALSE.
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ENDIF
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ANG1 = ATAN2 ( YN (N2) - YN (NFROM), XN (N2) - XN (NFROM))
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IF (ANG1 .LT. 0.) ANG1 = ANG1 + TWOPI
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ANG2 = ATAN2 ( YN (N0) - YN (NFROM), XN (N0) - XN (NFROM))
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IF (ANG2 .LT. 0.) ANG2 = ANG2 + TWOPI
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ANG3 = ATAN2 ( YN (NODE) - YN (NFROM), XN (NODE) - XN (NFROM))
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IF (ANG3 .LT. 0.) ANG3 = ANG3 + TWOPI
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C GET THE APPROPRIATE ANGLE BETWEEN ANGLE 1 AND 2
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ANG12D = ANG2 - ANG1
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IF (ANG12D .LT. 0.) ANG12D = ANG12D + TWOPI
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C IF THIS IS AN EXPANSION, THEN ADJUST THE ANGLE ACCORDINGLY
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IF (EXPAND) THEN
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IF (LXN (3, N2) .EQ. 0) THEN
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ANG12 = ANG1 + (ANG12D * .6)
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ELSEIF (LXN (3, N0) .EQ. 0) THEN
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ANG12 = ANG1 + (ANG12D * .4)
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ELSE
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ANG12 = ANG1 + (ANG12D * .5)
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ENDIF
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ELSE
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ANG12 = ANG1 + (ANG12D * .5)
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ENDIF
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IF (ANG12 .GT. TWOPI) ANG12 = ANG12 - TWOPI
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C GET THE AVERAGE ANGLE BETWEEN ANGLE 12 AND 3
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IF (ANG12 .GT. ANG3) THEN
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ANG3D = ANG12 - ANG3
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IF (ANG3D .GT. PI) THEN
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ANG = ANG12 + ((TWOPI - ANG3D) * .5)
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ELSE
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ANG = ANG12 - (ANG3D * .5)
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ENDIF
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ELSE
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ANG3D = ANG3 - ANG12
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IF (ANG3D .GT. PI) THEN
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ANG = ANG3 + ((TWOPI - ANG3D) * .5)
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ELSE
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ANG = ANG3 - (ANG3D * .5)
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ENDIF
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ENDIF
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C GET THE DISTANCE TO MAKE THE OUTSIDE FLAT AT THIS ANGLE
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D1 = SQRT ( ((XN (NFROM) - XN (N0)) ** 2) +
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& ((YN (NFROM) - YN (N0)) ** 2) )
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D2 = SQRT ( ((XN (N2) - XN (N0)) ** 2) +
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& ((YN (N2) - YN (N0)) ** 2) )
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D3 = SQRT ( ((XN (NFROM) - XN (N2)) ** 2) +
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& ((YN (NFROM) - YN (N2)) ** 2) )
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ARG = (SIN (ANG12D) * D1) / D2
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IF (ARG .GT. 1.0) ARG = 1.0
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IF (ARG .LT. -1.0) ARG = -1.0
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BETA = ASIN (ARG)
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D0 = (D3 * SIN (BETA)) / SIN (PI - BETA - (ANG12D * .5))
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IF (D0 .GT. DIST) THEN
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IF (EXPAND) THEN
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DIST0 = D0
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ELSE
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DIST0 = (DIST + D0) * .5
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ENDIF
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ELSE
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DIST0 = DIST
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ENDIF
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C CALCULATE THE NEW COORDINATES
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X0 = XN (NFROM) + (COS (ANG) * DIST0)
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Y0 = YN (NFROM) + (SIN (ANG) * DIST0)
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XDEL = (X0 - XN (NODE)) * VRO
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YDEL = (Y0 - YN (NODE)) * VRO
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ELSE
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XDEL = 0.
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YDEL = 0.
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ENDIF
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RETURN
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END
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