slen.F

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!||====================================================================
!||    slen     ../engine/source/elements/solid/solide/slen.F
!||--- called by ------------------------------------------------------
!||    fdlen3   ../engine/source/elements/solid/solide/fdlen3.F
!||    sdlen3   ../engine/source/elements/solid/solide/sdlen3.F
!||====================================================================
      SUBROUTINE slen(
     1   X1,      X2,      X3,      X4,
     2   Y1,      Y2,      Y3,      Y4,
     3   Z1,      Z2,      Z3,      Z4,
     4   J,       AREA,    AREAM,   NEL)
C
C NOTE : SURFACE OF FACETS IS AVAILABLE FOR ALE ELEMENTS
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, INTENT(IN) :: NEL
      INTEGER J
      my_real
     .   X1(*), X2(*), X3(*), X4(*), Y1(*), Y2(*), Y3(*), Y4(*),
     .   z1(*), z2(*), z3(*), z4(*),area(mvsiz,6),aream(*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
      my_real
     .   X13, Y13, Z13,
     .   X24, Y24, Z24,
     .   fs1, fs2, fs3,
     .   ft1, ft2, ft3,
     .   e, f, g
C-----------------------------------------------
      DO 10 i=1,nel
      x13=x3(i) - x1(i)
      x24=x4(i) - x2(i)
      y13=y3(i) - y1(i)
      y24=y4(i) - y2(i)
      z13=z3(i) - z1(i)
      z24=z4(i) - z2(i)
C
      fs1=x13-x24
      ft1=x13+x24
      fs2=y13-y24
      ft2=y13+y24
      fs3=z13-z24
      ft3=z13+z24
C
      e=fs1*fs1+fs2*fs2+fs3*fs3
      f=fs1*ft1+fs2*ft2+fs3*ft3
      g=ft1*ft1+ft2*ft2+ft3*ft3
      area(i,j) =e*g-f*f
      aream(i)= max(area(i,j),aream(i))
   10 CONTINUE
      RETURN
      END