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C $Id: mpd2sy.f,v 1.2 2000/10/25 18:55:01 gdsjaar Exp $ 
C $Log: mpd2sy.f,v $
C Revision 1.2  2000/10/25 18:55:01  gdsjaar
C In the pltli? functions, check for N==0 before doing any array
C accesses.
C
C Also changed all references to 'mask' to be arrays where they were
C scalars since downstream code seems to treat them as arrays.
C
C Revision 1.1  1993/07/16 16:47:11  gdsjaar
C Changed plt to library rather than single source file.
C 
C=======================================================================
      SUBROUTINE MPD2SY(N,X0,Y0,SYM)
      COMMON /MAP/MODEL(4,4),VIEW(4,4),PROJ(4,4),CPNEAR,CPFAR,VWPORT(4),
     *       MVP(4,4),VP(4,4),CPLINE(2,2,10),CPPLAN(2,3,10),PEYE(3),
     *       PLOOK(3),ETWIST,NCPLIN,NCPLAN,TMAT1(4,4),TMAT2(4,4),
     *       TMAT3(4,4),TVEC1(4),TVEC2(4),TVEC3(4),TVEC4(4),TARR1(32),
     *       TARR2(32),TARR3(32),TARR4(32),TARR5(32),TARR6(32),
     *       TARR7(32),TARR8(32)
      REAL MODEL,MVP
      CHARACTER*(*) SYM
      LOGICAL NOCLIP
      DIMENSION C1(2),C2(2),X0(*),Y0(*)
      INTEGER MASK(1)

      VCX = (VWPORT(1)+VWPORT(2))/2.
      VSX = (VWPORT(2)-VWPORT(1))/2.
      VCY = (VWPORT(3)+VWPORT(4))/2.
      VSY = (VWPORT(4)-VWPORT(3))/2.
      NOCLIP = (NCPLIN.EQ.0)
      J = 0
 2600 IF (.NOT. (J.LT.N)) GO TO 2610
      JN = MIN(N-J,32)
      J1 = J
      J = J + JN
      MASK(1) = -1
      IF (NOCLIP) THEN
         CALL MPMUL2(JN,X0(1+J1),Y0(1+J1),MVP,TARR1,TARR2,TARR3,TARR4)

      ELSE
         CALL MPMUL2(JN,X0(1+J1),Y0(1+J1),MODEL,TARR1,TARR2,TARR3,TARR4)
         DO 2620 K = 1,NCPLIN
            C1(1) = CPLINE(1,1,K)
            C1(2) = CPLINE(1,2,K)
            C2(1) = CPLINE(2,1,K)
            C2(2) = CPLINE(2,2,K)
            CALL PLTCP2(JN,MASK,TARR1,TARR2,C1,C2)
 2620    CONTINUE
         CALL MPMUL4(JN,MASK(1),TARR1,TARR2,TARR3,TARR4,VP,TARR1,TARR2,
     *               TARR3,TARR4)
      END IF

      DO 2640 I = 1,JN
         TARR1(I) = (TARR1(I)/TARR4(I))*VSX + VCX
         TARR2(I) = (TARR2(I)/TARR4(I))*VSY + VCY
 2640 CONTINUE
      C1(1) = VWPORT(1)
      C1(2) = VWPORT(3)
      C2(1) = VWPORT(2)
      C2(2) = VWPORT(4)
      CALL PLTVWP(C1,C2,JN,MASK,TARR1,TARR2)
      CALL PLTSBM(JN,MASK,TARR1,TARR2,SYM)
      GO TO 2600

 2610 CONTINUE
      RETURN

      END
