SUBROUTINE V2ST(I,X,Y,IX,IY)
      DIMENSION BUFIN(4),BFOUT(4)
      COMMON /TKTRNX/ TMINVX,TMINVY,TMAXVX,TMAXVY,TREALX,TREALY,
     1 TIMAGX,TIMAGY,TRCOSF,TRSINF,TRSCAL,TRFACX,TRFACY,
     2 TRPAR1,TRPAR2,TRPAR3,TRPAR4,TRPAR5,TRPAR6,KMOFLG(8),KPAD2,
     3 KBAUDR,KGNFLG,KGRAFL,KHOMEY,KKMODE,KHORSZ,KVERSZ,KTBLSZ,
     4 KSIZEF,KLMRGN,KRMRGN,KFACTR,KTERM,KLINE,KZAXIS,KBEAMX,KBEAMY,
     5 KMOVEF,KPCHAR(5),KDASHT,KMINSX,KMINSY,KMAXSX,KMAXSY,KEYCON,
     6 KINLFT,KOTLFT,KUNIT
      EQUIVALENCE (BUFIN(1),XS),(BUFIN(2),YS),(BUFIN(3),XE),
     1            (BUFIN(4),YE)
      EQUIVALENCE (BFOUT(1),CXS),(BFOUT(2),CYS),(BFOUT(3),CXE),
     1            (BFOUT(4),CYE)
      XE=X
      YE=Y
C * POINT OR MOVE
      IF(I .EQ. 0) GO TO 10
C * BRIGHT VECTOR
      XS=TIMAGX
      YS=TIMAGY
C * CLIP VECTOR
      CALL CLIPT(BUFIN,BFOUT)
C * ON SCREEN ?
      IF(KGNFLG .EQ. 1) GO TO 110
C * ARE WE AT START POINT ?
      IF(CXS .EQ. TREALX .AND. CYS .EQ. TREALY) GO TO 120
C * MOVE BEAM TO START POINT
      MODE=KKMODE
      CALL VECMOD
      CALL WINCOT(CXS,CYS,IX,IY)
      CALL XYCNVT(IX,IY)
      KKMODE=MODE
      GO TO 120
C * POINT OR MOVE
10    CALL PCLIPT(XE,YE)
C * OFF SCREEN ?
      IF(KGNFLG .EQ. 1) GO TO 110
      CXE=XE
      CYE=YE
C * CONVERT TO SCREEN COORDINATES
120   CALL WINCOT(CXE,CYE,IX,IY)
C * SAVE POSITION  ABS AND IMAGINARY
      TREALX=CXE
      TREALY=CYE
110   TIMAGX=X
      TIMAGY=Y
      RETURN
      END