Cloned SEACAS for EXODUS library with extra build files for internal package management.
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
C of 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 See packages/seacas/LICENSE for details
REAL FUNCTION SPIRAL (XA, XK, X, XCEN, YCEN, ANGLE)
C***********************************************************************
C FUNCTION SPIRAL = CALCULATES THE Y VALUUE GIVEN THE SPIRAL AND X
C***********************************************************************
SPIRAL = XA * EXP (XK * ANGLE) * COS (ANGLE) - (X - XCEN)
RETURN
END