interp.F

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!||====================================================================
!||    interp   ../engine/source/tools/curve/interp.F
!||--- called by ------------------------------------------------------
!||    laser2   ../engine/source/loads/laser/laser2.F
!||    laser3   ../engine/source/loads/laser/laser2.F
!||    m18law   ../engine/source/materials/mat/mat018/m18law.F
!||    m18th    ../engine/source/materials/mat/mat018/m18th.F
!||    repla3   ../engine/source/elements/spring/repla3.F
!||    rgwal1   ../engine/source/ale/grid/rgwal1.F
!||    timfun   ../engine/source/tools/curve/timfun.F
!||====================================================================
      SUBROUTINE interp(TF,TT,NPOINT,F,TG)
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 NPOINT
      my_real tt, f, tg
      my_real tf(2,*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, M
      my_real dt1, dt2, d1, d2
C-----------------------------------------------
      IF (tt-tf(1,npoint)>zero) GO TO 50
      DO 20 i=2,npoint
      m=i
      IF (tt-tf(1,m)<=zero) GO TO 30
   20 CONTINUE
   50 f=zero
      tg=zero
      RETURN
   30 dt1=tt-tf(1,m-1)
      dt2=-tt+tf(1,m)
      d1=tf(1,m)-tf(1,m-1)
      d2=tf(2,m)-tf(2,m-1)
      tg=zero
      IF(d1/=zero)tg=d2/d1
      !TEST POUR PRECISION DU CALCUL
      IF(dt1<=dt2)THEN
       f =tf(2,m-1)+dt1*tg
      ELSE
       f =tf(2,m)-dt2*tg
      ENDIF
      RETURN
      END