dnwalc.F

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!||====================================================================
!||    dnwalc      ../engine/source/output/anim/generate/dnwalc.F
!||--- called by ------------------------------------------------------
!||    dsecnor     ../engine/source/output/anim/generate/dsecnor.F
!||--- calls      -----------------------------------------------------
!||    write_s_c   ../common_source/tools/input_output/write_routtines.c
!||====================================================================
      SUBROUTINE dnwalc(X ,RWL ,MSR )
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER MSR
      my_real
     .   x(3,*), rwl(*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I,J
      my_real
     .   xwl, ywl, zwl,xn,yn,zn,d,dx,dy,dz,xl, v1, v2, v3, vv1,
     .   vv2, vv3, vv,s,c,xx,yy,zz,alpha,x0,y0,z0
      REAL R4
C-----------------------------------------------
C
       xn =rwl(1)
       yn =rwl(2)
       zn =rwl(3)
      IF(msr==0)THEN
       xwl=rwl(4)
       ywl=rwl(5)
       zwl=rwl(6)
      ELSE
       xwl=x(1,msr)
       ywl=x(2,msr)
       zwl=x(3,msr)
      ENDIF
C
      v1 = zero
      v2 = zep707
      v3 = zep707
 
      vv1 = v2 * zn - v3 * yn
      vv2 = v3 * xn - v1 * zn
      vv3 = v1 * yn - v2 * xn
      vv = sqrt(vv1*vv1 + vv2*vv2 + vv3*vv3)
      IF(vv<=half)THEN
        v1 = zero
        v2 = -zep707
        v3 = zep707
        vv1 = v2 * zn - v3 * yn
        vv2 = v3 * xn - v1 * zn
        vv3 = v1 * yn - v2 * xn
        vv = sqrt(vv1*vv1 + vv2*vv2 + vv3*vv3)
      ENDIF
      vv1 = vv1/vv
      vv2 = vv2/vv
      vv3 = vv3/vv
      v1 = vv2 * zn - vv3 * yn
      v2 = vv3 * xn - vv1 * zn
      v3 = vv1 * yn - vv2 * xn
C
      alpha = zero
      DO i=1,24
        s = sin(alpha)
        c = cos(alpha)
        xx = vv1 * s + v1 * c
        yy = vv2 * s + v2 * c
        zz = vv3 * s + v3 * c
        d = three1000
        DO j=1,2
          CALL write_s_c(nint(xx*d),1)
          CALL write_s_c(nint(yy*d),1)
          CALL write_s_c(nint(zz*d),1)
        ENDDO
        alpha = alpha + pi*one_over_12
      ENDDO
C
      RETURN
      END