	SUBROUTINE PLOTXY(X,NXS,XF,YF,IPV)
C** 
C**    @(#)plotxy.F	1.1    3/10/88
C**
C**
C***********************************************************************
C**
C**                 PLOT+ Scientific Graphics System
C**
C***********************************************************************
C**
C**
C
C  ARRAY X HOLDS X AND Y'S FOR ALL LINES.  DIMENSIONED FOR NXS.
C  ORDER AS FOLLOWS:  ALL X'S FOR LINE1, ALL X'S FOR LINE2,...
C                     STARTING AT X(NXS/2+1), ALL Y'S FOR LINE1,
C                     ALL Y'S FOR LINE2...
C  XF AND YF ARE FACTORS TO CONVERT TO INCHES FROM USER UNITS
C
*
*
*  This software was developed by the Thermal Modeling and Analysis
*  Project(TMAP) of the National Oceanographic and Atmospheric
*  Administration's (NOAA) Pacific Marine Environmental Lab(PMEL),
*  hereafter referred to as NOAA/PMEL/TMAP.
*
*  Access and use of this software shall impose the following
*  obligations and understandings on the user. The user is granted the
*  right, without any fee or cost, to use, copy, modify, alter, enhance
*  and distribute this software, and any derivative works thereof, and
*  its supporting documentation for any purpose whatsoever, provided
*  that this entire notice appears in all copies of the software,
*  derivative works and supporting documentation.  Further, the user
*  agrees to credit NOAA/PMEL/TMAP in any publications that result from
*  the use of this software or in any product that includes this
*  software. The names TMAP, NOAA and/or PMEL, however, may not be used
*  in any advertising or publicity to endorse or promote any products
*  or commercial entity unless specific written permission is obtained
*  from NOAA/PMEL/TMAP. The user also understands that NOAA/PMEL/TMAP
*  is not obligated to provide the user with any support, consulting,
*  training or assistance of any kind with regard to the use, operation
*  and performance of this software nor to provide the user with any
*  updates, revisions, new versions or "bug fixes".
*
*  THIS SOFTWARE IS PROVIDED BY NOAA/PMEL/TMAP "AS IS" AND ANY EXPRESS
*  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  ARE DISCLAIMED. IN NO EVENT SHALL NOAA/PMEL/TMAP BE LIABLE FOR ANY SPECIAL,
*  INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
*  RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
*  CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION, ARISING OUT OF OR IN
*  CONNECTION WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE. 
*
*
*	Modified *jd* J Davison JISAO/PMEL/TMAP 3.22.89
*	To exclude Denbo line dashing in favor of GKS line bundles 
*	Mod *jd* 8.3.92 to add interrupts 
*	Mod *sh* 11/97 to add PLOTPOL command

*  ACM  8-30-2000 Go back to calling the line dash subroutine.   
*  ACM 10/2012    Modulo-ing for PLOT/VS longitudes overlaid on a map.
*  ACM  2/2013    ticket 2141. Fix the modulo operation when the longitude
*                 range is over 360.
* V6.94+ *acm* 3/15 Ticket 2247: singleton points in line plots marked with a dot
* v696 *acm*   6/15 PLOT/VS/GAPLOC to define seperate line segments on	
*                   PLOT/VS plots (LAS ticket 1597 and others)
* v696 *acm*   6/15 Reverting. Implement /GAPLOC only for ribbon plots.	
* V698  4/16 *acm* New PLOT/SKIP=

        include         'xinterrupt.cmn' ! 1/89 *sh*
        include         'ppl_in_ferret.cmn'

	DIMENSION X(NXS)

        include 'parampl5_dat.decl'
        include 'PARAMPL5.DAT'
        include 'axis_inc.decl'
        include 'AXIS.INC'
        include 'lines_inc.decl'
        include 'LINES.INC'
        include 'pen_inc.decl'
        include 'PEN.INC'
        include 'pltl_inc.decl'
        include 'PLTL.INC'
        include 'hd_inc.decl'
        include 'HD.INC'
        include 'miss_inc.decl'
        include 'MISS.INC'
        include 'taxis_inc.decl'
        include 'TAXIS.INC'
        include 'axisl_inc.decl'
        include 'AXISL.INC'
        include 'cmrd_inc.decl'
        include 'CMRD.INC'
        include 'gkscm2.cmn' ! jd 3.22.89
        include 'gkspar.inc'	! sh 11/97
        include 'shade_vars.cmn'	! sh 11/97
        INCLUDE 'makedot.cmn'    ! 10/01 *acm*

	REAL MAXVEL

        REAL	xadd, xaddlast, datx, daty

	LOGICAL md
	INTEGER xpolybase, ypolybase, zpolybase, polysizemax, nl,
     .		nvertex, fill_ndx, nskp, idec

	INTEGER klast, mdot
	REAL	xtlast, ytlast

	INTEGER GET_NDX

* GKS initialization vars
	integer		error,trans_no,cflag
        integer         my_trans
        data            my_trans/20/
	real	 	w(4),v(4),ndc(4),uc(4)
	real		xinv,yinv

	logical		valid

*************************************

	nl = lnum

	xadd = 0.
	xadlast = 0.	
	MDOT = 99
C
C  JTYPE IS DATA TYPE (0 FOR 2D, 1 FOR 1D)
C
	IF(IPV.NE.0 .AND.JTYPE.NE.1) RETURN


1000	IBASE=0
	IY=NXS/2
	CS=COS(VANG*.01745329252)
	SN=SIN(VANG*.01745329252)
	ZT=YF/XF
	ICNT=1
	IF(M.GE.2.AND.IFLG(2).NE.0)ICNT=P(2)


	IF(MAKEP.EQ.'PLOTUV')THEN
	  IBASE=IY
	  IBASE1=0
	  IBASE2=LLENG(1)+IY
	  DO 90 I=1,LNUM,2
	    CALL VECTRS
	    CALL COLOR(IPEN(I))
	    DO 95 J=1,LLENG(I),ICNT
	      IF(XLE.AND.X(IBASE+J).LE.CMXLE)GOTO 95
	      IF(XEQ.AND.X(IBASE+J).EQ.CMXEQ)GOTO 95
	      IF(XGE.AND.X(IBASE+J).GE.CMXGE)GOTO 95
	      IF(YLE.AND.X(IBASE2+J).LE.CMYLE)GOTO 95
	      IF(YEQ.AND.X(IBASE2+J).EQ.CMYEQ)GOTO 95
	      IF(YGE.AND.X(IBASE2+J).GE.CMYGE)GOTO 95
	      YT= YFCT(I)*X(IBASE2+J)*CS + XFCT(I)*X(IBASE+J)*SN
	      XT= (XFCT(I)*X(IBASE+J)*CS - YFCT(I)*X(IBASE2+J)*SN)*ZT
	      CALL PLOT(X(IBASE1+J)+XOFF(I),YOFF(I),0,0)
	      CALL PLOT(X(IBASE1+J)+XOFF(I)+XT,YOFF(I)+YT,1,0)
	      if (interrupted) goto 51 ! *jd* 8.3.92
95	    CONTINUE
	    IBASE=IBASE2+LLENG(I+1)
	    IBASE1=IBASE1+LLENG(I+1)+LLENG(I)
90	  IBASE2=IBASE+LLENG(I+2)
	  GOTO 51
	END IF

******** LOOP OVER LINES STORED
	DO 50 I=1,nl
	  CALL MARKH(HMARK(I))
	  CALL COLOR(IPEN(I))

C set decimation for symbols
	  nskp = MAX(1,nskpsym(i))

C     SET PLOT MODE
	  IF(IPV.EQ.1)THEN
C     DRAW VECTORS
	    CALL VECTRS
	    DO 80 J=1,LLENG(I),ICNT
	      IF(XLE.AND.X(IBASE+J).LE.CMXLE)GOTO 80
	      IF(XEQ.AND.X(IBASE+J).EQ.CMXEQ)GOTO 80
	      IF(XGE.AND.X(IBASE+J).GE.CMXGE)GOTO 80
	      IF(YLE.AND.X(IY+IBASE+J).LE.CMYLE)GOTO 80
	      IF(YEQ.AND.X(IY+IBASE+J).EQ.CMYEQ)GOTO 80
	      IF(YGE.AND.X(IY+IBASE+J).GE.CMYGE)GOTO 80
	      YT= YFCT(I)*X(IY+IBASE+J)*CS + XFCT(I)*X(IBASE+J)*SN
	      XT=(XFCT(I)*X(IBASE+J)*CS - YFCT(I)*X(IY+IBASE+J)*SN)*ZT
	      CALL PLOT(FLOAT(J)+XOFF(I),YOFF(I),0,0)
	      CALL PLOT(FLOAT(J)+XOFF(I)+XT,YOFF(I)+YT,1,0)
80          CONTINUE

	  ELSE IF(IPV.EQ.2) THEN
	    IF( m .ge. 1 .and. iflg(1) .ne. 0)then
	       if( p(1) .gt. 0 )then
		   rlenfact = p(1) * abs(xf)
	       else
		   rlenfact = -p(1) * abs(yf)
	       endif
	    else
	       rlenfact = min( abs(xf), abs(yf))
	    endif
	    jcnt = 1
	    if( m .ge. 2 .and. iflg(2) .ne. 0)jcnt = p(2)
	    IF ( i .GT. 1) GOTO 50
	    ibaseu = 0
	    ibasev = iy
	    ibasex = lleng(1)
	    ibasey = iy + lleng(1)
	    CALL COLOR(IPEN(1))
	    maxvel = 0.0
	    DO 100 j = 1,lleng(1),jcnt
	      dist=sqrt(x(ibasev+j)**2+x(ibaseu+j)**2)
	      if(dist.gt.maxvel)maxvel=dist
	      ytail = x(ibasey+j)
	      yhead = ytail + rlenfact*x(ibasev+j)/yf
	      xtail = x(ibasex+j)
	      xhead = xtail + rlenfact*x(ibaseu+j)/xf
	      CALL DRAWVEC(xtail,ytail,xhead,yhead,rlenfact,0,xf,yf)
100	    CONTINUE
	    CALL DRAWVEC(maxvel,ytail,xhead,yhead,rlenfact,1,xf,yf)

* standard line or point plot
	  ELSEIF (ipv .EQ. 0) THEN
!ACM 	    IF(ITYPE(I).GE.4 .and. .not.gks_open)THEN ! JD 3.22.89
	    IF(ITYPE(I).GE.4)THEN ! JD 3.22.89
	      CALL DASHSZ(DN1(I),UP1(I),DN2(I),UP2(I))
	      CALL DASHES
	    ELSE
	      CALL VECTRS
	    END IF
	    IF(ITYPE(I).EQ.3)THEN 
               CALL POINTS
               IF (imark(i) .eq. 99) ipt = 0
            ENDIF
	    IF(.NOT.(XLE.OR.XEQ.OR.XGE.OR.YLE.OR.YEQ.OR.YGE))THEN
C     DO NOT CHECK POINTS FOR MISSING DATA
	      CALL TRANS(I,X(IBASE+1),X(IY+IBASE+1),XT,YT)
	      CALL PLOT(XT,YT,0,0)
	      IF(ITYPE(I).NE.0.AND.ITYPE(I).NE.4)CALL MARK(IMARK(I))
	      IM=0
	      IF(ITYPE(I).EQ.1.OR.ITYPE(I).EQ.3)IM=IMARK(I)
	      DO 60 J=IBASE+1,IBASE+LLENG(I)
	        CALL TRANS(I,X(J),X(IY+J),XT,YT)
	        CALL PLOT(XT,YT,1,0)
60            CALL MARK(IM)
	    ELSE
C     CHECK POINTS FOR OUT OF RANGE   (CM)
	      DO 70 J=IBASE+1,IBASE+LLENG(I)
* ... locate first point
		IF(XLE.AND.X(J).LE.CMXLE)GOTO 70
		IF(XEQ.AND.X(J).EQ.CMXEQ)GOTO 70
		IF(XGE.AND.X(J).GE.CMXGE)GOTO 70
		IF(YLE.AND.X(IY+J).LE.CMYLE)GOTO 70
		IF(YEQ.AND.X(IY+J).EQ.CMYEQ)GOTO 70
		IF(YGE.AND.X(IY+J).GE.CMYGE)GOTO 70

		datx = X(J)
	        daty = X(IY+J)
		IF (MOD_VS_X .AND. datx .LT. xlo) THEN
		   xadd = 360.
		   datx = datx + xadd
		ELSE IF (MOD_VS_X .AND. datx .GT. xhi) THEN
		   xadd = -360.
		   datx = datx + xadd
		ENDIF
		xaddlast = xadd

	        CALL TRANS(I,datx,daty,XT,YT)
	        CALL PLOT(XT,YT,0,0)
	        IF(ITYPE(I).NE.0.AND.ITYPE(I).NE.4) CALL MARK(IMARK(I))
		IM=0
	        IF(ITYPE(I).EQ.1.OR.ITYPE(I).EQ.3) IM=IMARK(I)
	        GOTO 71
70	      CONTINUE
71	      IDN=1
	      idec = 0
* ... plot remaining points
	      DO 72 K=J+1,IBASE+LLENG(I)
		IF((XLE.AND.X(K).LE.CMXLE).OR.
     *		   (XEQ.AND.X(K).EQ.CMXEQ).OR.
     *		   (XGE.AND.X(K).GE.CMXGE).OR.
     *		 (YLE.AND.X(IY+K).LE.CMYLE).OR.
     *		 (YEQ.AND.X(IY+K).EQ.CMYEQ).OR.
     *		 (YGE.AND.X(IY+K).GE.CMYGE))THEN

		  IF (IDN .EQ. 1 .AND. klast.EQ.k-1) THEN ! prev pt was a singleton
                      CALL PLOT(XTLAST,YTLAST,0,0)
                      CALL MARK(MDOT)
		  ENDIF

	          IDN=0
	        ELSE

	          IF (MOD_VS_X) THEN
	          datx = X(K)
	          daty = X(IY+K)

		  IF (MOD_VS_X .AND. datx .LT. xlo) THEN 
		     xadd = 360.
		     datx = datx + xadd

		  ELSE IF (MOD_VS_X .AND. datx .GT. xhi) THEN  
		     xadd = -360.
		     datx = datx + xadd

		  ELSE
		     xadd = 0.

		  ENDIF

* New modulo wrap: Plot to next point on the last wrap, then pick up the pen, go to 
* the new point on new wrap, then go on.
		  IF (xadd .NE. xaddlast) THEN
		     datxlast = datx - xadd + xaddlast
		     CALL TRANS(I,datxlast,daty,XT,YT)
		     CALL PLOT(xt,yt,idn,0)
		     CALL TRANS(I,datx,daty,XT,YT)
		     CALL PLOT(XT,YT,0,0)
		     CALL PLOT(XT,YT,IDN,0)
		  ENDIF

		  CALL TRANS(I,datx,daty,XT,YT)
		  xaddlast = xadd
	
	          ELSE
		     CALL TRANS(I,X(K),X(IY+K),XT,YT)
		  ENDIF  ! mod_vs_x

		  CALL PLOT(XT,YT,IDN,0)

		  if (interrupted) goto 51 ! *jd* 8.3.92
	          idec = idec + 1
	          md = MOD(idec,nskp) .EQ. 0
	          IF (md) CALL MARK(IM)
	          IF(IDN.EQ.0)THEN
		    xtlast = xt
		    ytlast = yt
		    klast = k
	            IDN=1
	          END IF
	        END IF
72	      CONTINUE
	    END IF
	    IF(ITYPE(I).EQ.2.OR.ITYPE(I).EQ.5)CALL MARK(IMARK(I))

	  END IF

          IF (imark(i) .eq. 99) THEN
             CALL doit_makedot(IPT,XDOT,YDOT)
             IPT = 0
          ENDIF
	if (interrupted) go to 51 !*jd* 8.3.92
50	IBASE=IBASE+LLENG(I)

******** END OF LOOP OVER LINES STORED

*** FINALIZE
 51	CONTINUE
        IF (imark(i) .eq. 99) THEN
          CALL doit_makedot(IPT,XDOT,YDOT)
          IPT = 0
        ENDIF

        CALL COLOR(IPEN(0))
	RETURN

	END
