sectarea.F

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!      SUBROUTINE SECTAREA(IXS,X,IBUF,NELE,ISOLNOD,AREA)  
!||====================================================================
!||    sectarea          ../starter/source/loads/bolt/sectarea.F
!||--- called by ------------------------------------------------------
!||    hm_read_preload   ../starter/source/loads/general/preload/hm_read_preload.F
!||--- uses       -----------------------------------------------------
!||====================================================================
      SUBROUTINE sectarea(IXS,IXS10,X,IBUF,NELE,ISOLNOD,AREA,ITAB)
      use element_mod , only : nixs
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com04_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER IXS(NIXS,*),IXS10(6,*),IBUF(2,*),ISOLNOD(*)  ,ITAB(*)
      INTEGER NELE
      my_real
     .   area,x(3,*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------     
      INTEGER IE, II, I, J, IN1, IN2, IN3, I10
      INTEGER NODE(10)
      my_real
     .   x1,y1,z1,x2,y2,z2,x3,y3,z3,n3
C=======================================================================
      
      area = zero
      DO ie=1,nele
        j=0
        ii=ibuf(1,ie)
        node(1:10) = 0
        IF(ii<=numels8)THEN
         IF(isolnod(ii) == 4) THEN     ! Case of tetra4
           DO i=0,6,2
            IF(btest(ibuf(2,ie),i)) THEN
              j=j+1
              node(j)=ixs(i+2,ii)
            ENDIF
           ENDDO
         ELSE IF (isolnod(ii) == 8) THEN
           DO i=0,7
            IF(btest(ibuf(2,ie),i)) THEN
              j=j+1
              node(j)=ixs(i+2,ii)
            ENDIF
           ENDDO
         ENDIF
           
         IF(j>=3)THEN
           in1 = node(1)
           in2 = node(2)
           in3 = node(3)
           x1=x(1,in1)-x(1,in2)
           y1=x(2,in1)-x(2,in2)
           z1=x(3,in1)-x(3,in2)
           x2=x(1,in3)-x(1,in2)
           y2=x(2,in3)-x(2,in2)
           z2=x(3,in3)-x(3,in2)
           x3=y1*z2-z1*y2
           y3=z1*x2-z2*x1
           z3=x1*y2-x2*y1
           n3=x3*x3+y3*y3+z3*z3
           area=area+half*sqrt(n3)
           IF(j==4)THEN
             in2 = node(4)
             x1=x(1,in1)-x(1,in2)
             y1=x(2,in1)-x(2,in2)
             z1=x(3,in1)-x(3,in2)
             x2=x(1,in3)-x(1,in2)
             y2=x(2,in3)-x(2,in2)
             z2=x(3,in3)-x(3,in2)
             x3=y1*z2-z1*y2
             y3=z1*x2-z2*x1
             z3=x1*y2-x2*y1
             n3=x3*x3+y3*y3+z3*z3
             area=area+half*sqrt(n3)
           ENDIF
         ENDIF
         
        ELSE
         i10=ii-numels8
         IF(i10<=numels10) THEN
         !IF(ISOLNOD(II) == 10) THEN     ! Cas du tetra10
          DO i=0,6,2
           IF(btest(ibuf(2,ie),i)) THEN
            j=j+1
            node(j)=ixs(i+2,ii)
           ENDIF
          ENDDO
          DO i=8,13
           IF(btest(ibuf(2,ie),i)) THEN
            j=j+1
            node(j)=ixs10(i-7,i10)
           ENDIF
          ENDDO
         
         IF(j==6)THEN
          in1 = node(1)
          in2 = node(2)
          in3 = node(3)
          x1=x(1,in2)-x(1,in1)
          y1=x(2,in2)-x(2,in1)
          z1=x(3,in2)-x(3,in1)
          x2=x(1,in3)-x(1,in1)
          y2=x(2,in3)-x(2,in1)
          z2=x(3,in3)-x(3,in1)
          x3=y1*z2-z1*y2
          y3=z1*x2-z2*x1
          z3=x1*y2-x2*y1
          n3=x3*x3+y3*y3+z3*z3
          area=area+half*sqrt(n3)
         ENDIF
        ENDIF
        ENDIF
      ENDDO
         
      RETURN
      END