slen.F

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!||====================================================================
!||    slen       ../starter/source/elements/solid/solide/slen.F
!||--- called by ------------------------------------------------------
!||    s6cderi3   ../starter/source/elements/thickshell/solide6c/s6cderi3.F
!||    sdlen3     ../starter/source/elements/solid/solide/sdlen3.F
!||====================================================================
      SUBROUTINE slen(X1,X2,X3,X4,Y1,Y2,Y3,Y4,Z1,Z2,Z3,Z4,J,
     .     AREA, AREAM)
C-----------------------------------------------------------
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER J
      my_real
     .   x1(*), x2(*), x3(*), x4(*), y1(*), y2(*), y3(*), y4(*),
     .   z1(*), z2(*), z3(*), z4(*),
     .   area(6, *), aream(*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "vect01_c.inc"
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
      my_real
     .   x13(mvsiz), x24(mvsiz), y13(mvsiz),
     .   y24(mvsiz), z13(mvsiz), z24(mvsiz), 
     .   fs1(mvsiz), fs2(mvsiz), fs3(mvsiz), ft1(mvsiz), ft2(mvsiz),
     .   ft3(mvsiz), e(mvsiz), f(mvsiz), g(mvsiz)
C-----------------------------------------------------------------------
C
      DO i=lft,llt
        x13(i)    = x3(i)-x1(i)
        x24(i)    = x4(i)-x2(i)
        y13(i)    = y3(i)-y1(i)
        y24(i)    = y4(i)-y2(i)
        z13(i)    = z3(i)-z1(i)
        z24(i)    = z4(i)-z2(i)
        fs1(i)    = x13(i)-x24(i)
        ft1(i)    = x13(i)+x24(i)
        fs2(i)    = y13(i)-y24(i)
        ft2(i)    = y13(i)+y24(i)
        fs3(i)    = z13(i)-z24(i)
        ft3(i)    = z13(i)+z24(i)
        e(i)      = fs1(i)*fs1(i)+fs2(i)*fs2(i)+fs3(i)*fs3(i)
        f(i)      = fs1(i)*ft1(i)+fs2(i)*ft2(i)+fs3(i)*ft3(i)
        g(i)      = ft1(i)*ft1(i)+ft2(i)*ft2(i)+ft3(i)*ft3(i)
        area(j,i) = e(i)*g(i)-f(i)*f(i)
        aream(i)  = max(area(j,i),aream(i))
      END DO
      
      RETURN
      END