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|
SUBROUTINE CONGEN (XI,YI,IPACK,SCRARR,ICA)
C
C +-----------------------------------------------------------------+
C | |
C | Copyright (C) 1986 by UCAR |
C | University Corporation for Atmospheric Research |
C | All Rights Reserved |
C | |
C | NCARGRAPHICS Version 1.00 |
C | |
C +-----------------------------------------------------------------+
C
C
C
C DRAW A CONTOUR AT THE CURRENT LEVEL
C
C INPUT
C XI YI LOWER RIGHT CORNER OF CELL
C IPACK-FLAG TO ALLOW REDUCTION OF COORDINATE PAIR STORAGE
C IF REQUIRED
C SCRARR-SCRATCH ARRAY OF CONTOUR VALUES
C ICA-ENTERING CASE CONDITIONS IF ANY REQUIRED
C
C
C
C
COMMON /CONRA1/ CL(30) ,NCL ,OLDZ ,PV(210) ,
1 FINC ,HI ,FLO
COMMON /CONRA2/ REPEAT ,EXTRAP ,PER ,MESS ,
1 ISCALE ,LOOK ,PLDVLS ,GRD ,
2 CINC ,CHILO ,CON ,LABON ,
3 PMIMX ,SCALE ,FRADV ,EXTRI ,
4 BPSIZ ,LISTOP
COMMON /CONRA3/ IREC
COMMON /CONRA4/ NCP ,NCPSZ
COMMON /CONRA5/ NIT ,ITIPV
COMMON /CONRA6/ XST ,YST ,XED ,YED ,
1 STPSZ ,IGRAD ,IG ,XRG ,
2 YRG ,BORD ,PXST ,PYST ,
3 PXED ,PYED ,ITICK
COMMON /CONRA7/ TITLE ,ICNT ,ITLSIZ
COMMON /CONRA8/ IHIGH ,INMAJ ,INLAB ,INDAT ,
1 LEN ,IFMT ,LEND ,
2 IFMTD ,ISIZEP ,INMIN
COMMON /CONRA9/ ICOORD(500),NP ,MXXY ,TR ,
1 BR ,TL ,BL ,CONV ,
2 XN ,YN ,ITLL ,IBLL ,
3 ITRL ,IBRL ,XC ,YC ,
4 ITLOC(210) ,JX ,JY ,ILOC ,
5 ISHFCT ,XO ,YO ,IOC ,NC
COMMON /CONR10/ NT ,NL ,NTNL ,JWIPT ,
1 JWIWL ,JWIWP ,JWIPL ,IPR ,
2 ITPV
COMMON /CONR11/ NREP ,NCRT ,ISIZEL ,
1 MINGAP ,ISIZEM ,
2 TENS
COMMON /CONR12/ IXMAX ,IYMAX ,XMAX ,YMAX
LOGICAL REPEAT ,EXTRAP ,PER ,MESS ,
1 LOOK ,PLDVLS ,GRD ,LABON ,
2 PMIMX ,FRADV ,EXTRI ,CINC ,
3 TITLE ,LISTOP ,CHILO ,CON
COMMON /CONR15/ ISTRNG
CHARACTER*64 ISTRNG
COMMON /CONR16/ FORM
CHARACTER*10 FORM
COMMON /CONR17/ NDASH, IDASH, EDASH
CHARACTER*10 NDASH, IDASH, EDASH
C
C
C
DIMENSION SCRARR(1) ,IXMOV(2) ,IYMOV(2)
CHARACTER*64 IHOLD
CHARACTER*23 IVOUT
INTEGER GOOP
C
SAVE
DATA NOOP,GOOP/1,0/
C
C STATEMENT FUNCTIONS FOR MAPPING GRAPHICS OUTPUT
C
FX(XXX,YYY) = XXX
FY(XXX,YYY) = YYY
C
C STATEMENT FUNCTION TO MAKE ARRAY ACCESS SEEM LIKE MATRIX ACCESS
C
SCRTCH(IXX,IYY) = SCRARR(IYY+(IXX-1)*IYMAX)
C
C DRAW AN ENTIRE CONTOUR LINE WHEN A POTENTIAL START POINT IS
C PROVIDED
C
C SAVE STARTING CELL
C
XCS = XI
YCS = YI
C
C TEST IF VALID START POINT
C
ICASE = ICA
XC = XI
YC = YI
CALL CONCLD (ICASE,NOOP)
C
C IF NO CONTOUR RETURN
C
IF (ICASE.EQ.-1) RETURN
IF (ICASE.EQ.0) RETURN
C
C IF CONTOUR ALREADY DRAWN RETURN
C
ILOC = IOR(ISHIFT(JX,ISHFCT),JY)
IF (NP.EQ.0) GO TO 20
C
C TEST IF CONTOUR FOUND
C
DO 10 I=1,NP
IF (ILOC.NE.ICOORD(I)) GO TO 10
RETURN
10 CONTINUE
C
C GET CORRECT OLD CASE
C
20 IC = IOC
IF (ICASE.EQ.IOC) IC = NC
C
C SET UP STRUCTURE TO START IN OTHER DIRECTION FROM HERE IF CONTOUR
C UNEXPECTLY ENDS IN THIS DIRECTION
C
IFCASE = IC
IFOCSE = ICASE
FXO = XO
FYO = YO
LOOP = 1
C
C SET UP IC TO SIMULATE EXIT FROM A PREVIOUS CELL
C
IC = MOD(IC+2,4)
C
C IF EXTRAPOLATING PASS ON
C
IF (EXTRAP) GO TO 60
C
C TEST IF CONTOUR EXCEEDED BORDER LIMITS
C NOTE THAT ICASER CANNOT EQUAL 3 AT THIS POINT
C
GO TO ( 30, 40, 30, 50),ICASE
C
C EXIT FROM BOTTOM
C
30 IF (JX.GE.IXMAX) RETURN
GO TO 60
C
C EXIT FROM LEFT
C
40 IF (JY.LE.ITLOC(JX*2 - 1)) RETURN
GO TO 60
C
C EXIT FROM RIGHT
C
50 IF (JY.GE.ITLOC(JX*2 - 1)) RETURN
C
C SAVE CELL INFO IF COMMING BACK
C
60 TRT = TR
BRT = BR
TLT = TL
BLT = BL
IX = JX
IY = JY
C
C VALID CONTOUR START FOUND
C
XX = FX(XO,YO)
CALL FRSTD (XX,FY(XO,YO))
C
C DRAW CONTOUR IN THIS CELL
C
70 XX = FX(XN,YN)
CALL VECTD (XX,FY(XN,YN))
XCSTOR = XC
YCSTOR = YC
IXSTOR = IX
IYSTOR = IY
IOLDC = IC
IC = ICASE
C
C ENTER COORDINATE PAIR OF CONTOUR IN LIST
C
NP = NP+1
IF (NP.GT.MXXY) GO TO 180
ICOORD(NP) = ILOC
C
C BRANCH TO APPROPIATE CODE DEPENDING ON CONTOUR EXIT FROM THE CELL
C
80 GO TO ( 90, 110, 130, 150),IC
C
C EXIT FORM BOTTOM
C END CONTOUR IF ON CONVEX HULL
C
90 IF (EXTRAP) GO TO 100
IF (IY.LT.ITLOC(IX*2 - 1) .OR. IY-1.GT.ITLOC(IX*2)) GO TO 360
100 TR = BR
TL = BL
XC = XC+STPSZ
C
C IF ON BORDER END CONTOUR
C
IX = IX+1
IF (IX.GT.IXMAX) GO TO 360
BR = SCRTCH(IX,IY)
BL = SCRTCH(IX,IY-1)
ILOC = IOR(ISHIFT(IX,ISHFCT),IY)
C
C BRANCH IF CONTOUR CLOSED
C
IF (IX.EQ.JX .AND. IY.EQ.JY) GO TO 170
CALL CONCLD (ICASE,GOOP)
IF (ICASE.EQ.-1) GO TO 360
IF (ICASE.NE.0) GO TO 70
GO TO 230
C
C EXIT FROM LEFT SIDE
C TEST IF IN CONVEX HULL
C
110 IF (EXTRAP) GO TO 120
IF (IY-1.LT.ITLOC( (IX-1)*2 - 1 ) .AND. IY-1.LT.ITLOC(IX*2 - 1))
1 GO TO 360
120 TR = TL
BR = BL
YC = YC-STPSZ
C
C IF ON BORDER END CONTOUR
C
IY = IY-1
IF (IY.LT.2) GO TO 360
TL = SCRTCH(IX-1,IY-1)
BL = SCRTCH(IX,IY-1)
C
C BRANCH IF CONTOUR CLOSED
C
IF (IX.EQ.JX .AND. IY.EQ.JY) GO TO 170
ILOC = IOR(ISHIFT(IX,ISHFCT),IY)
CALL CONCLD (ICASE,GOOP)
IF (ICASE.EQ.-1) GO TO 360
IF (ICASE.NE.0) GO TO 70
GO TO 230
C
C EXIT FROM TOP
C END CONTOUR IF OUT OF CONVEX HULL
C
130 IF (EXTRAP) GO TO 140
IF (IY.LT.ITLOC( (IX-1)*2 - 1 ) .OR. IY-1.GT.ITLOC( (IX-1)*2 ))
1 GO TO 360
140 BR = TR
BL = TL
XC = XC-STPSZ
C
C END CONTOUR IF OUTSIDE OF BORDER
C
IX = IX-1
IF (IX.LT.2) GO TO 360
TR = SCRTCH(IX-1,IY)
TL = SCRTCH(IX-1,IY-1)
ILOC = IOR(ISHIFT(IX,ISHFCT),IY)
C
C BRANCH IF CONTOUR CLOSED
C
IF (IX.EQ.JX .AND. IY.EQ.JY) GO TO 170
CALL CONCLD (ICASE,GOOP)
IF (ICASE.EQ.-1) GO TO 360
IF (ICASE.NE.0) GO TO 70
GO TO 230
C
C EXIT FROM RIGHT SIDE
C TEST IF ON CONVEX HULL
C
150 IF (EXTRAP) GO TO 160
IF (IY.GT.ITLOC( (IX-1)*2 ) .AND. IY.GT.ITLOC(IX*2)) GO TO 360
160 TL = TR
BL = BR
YC = YC+STPSZ
C
C IF ON BORDER END CONTOUR
C
IY = IY+1
IF (IY.GT.IYMAX) GO TO 360
TR = SCRTCH(IX-1,IY)
BR = SCRTCH(IX,IY)
ILOC = IOR(ISHIFT(IX,ISHFCT),IY)
C
C BRANCH IF CONTOUR CLOSED
C
IF (IX.EQ.JX .AND. IY.EQ.JY) GO TO 170
CALL CONCLD (ICASE,GOOP)
IF (ICASE.EQ.-1) GO TO 360
IF (ICASE.NE.0) GO TO 70
GO TO 230
C
C END THE CONTOUR
C
170 CALL LASTD
TR = TRT
BR = BRT
TL = TLT
BL = BLT
RETURN
C
C CONTOUR STORAGE EXCEEDED TRY PACKING
C
180 IF (IPACK.EQ.0) GO TO 200
NP = 0
ITEST = IOR(ISHIFT(JX,ISHFCT),JY)
DO 190 K=1,MXXY
IF (ICOORD(K).LE.ITEST) GO TO 190
NP = NP+1
ICOORD(NP) = ICOORD(K)
190 CONTINUE
IF (NP.LT.MXXY) GO TO 80
C
C FAILURE NO MORE SPACE ABORT THIS CONTOUR LEVEL
C
200 IHOLD(1:39) = ' CONDRW-CONTOUR STORAGE EXAUSTED LEVEL='
C
C BLANK FILL THE ENCODE ARRAY
C
IVOUT = ' '
C +NOAO - FTN internal write rewritten as encode for IRAF.
C
C WRITE(IVOUT,'(G13.5)')CONV
call encode (13, '(g13.5)', ivout, conv)
C
C -NOAO
IHOLD(40:62) = IVOUT
CALL SETER (IHOLD,10,IREC)
RETURN
C
C BAD TIME THE CONTOUR EXITED A CORNER OF THE CELL MUST SEARCH FOR
C NEW CELL
C
230 IXSTP = IXSTOR
IYSTP = IYSTOR
GO TO ( 240, 250, 260, 270),IOLDC
C
C PREVIOUS CELL BOTTOM EXIT
C
240 IXSTP = IXSTP-1
GO TO 280
C
C PREVIOUS CELL LEFT EXIT
C
250 IYSTP = IYSTP+1
GO TO 280
C
C PREVIOUS CELL TOP EXIT
C
260 IXSTP = IXSTP+1
GO TO 280
C
C PREVIOUS CELL RIGHT EXIT
C
270 IYSTP = IYSTP-1
C
C BRANCH TO CURRENT CELL CASE
C
280 GO TO ( 290, 300, 310, 320),IC
C
C APPARENT BOTTOM EXIT
C
290 IXMOV(1) = 0
IXMOV(2) = 1
IYMOV(1) = -1
IYMOV(2) = 1
GO TO 330
C
C APPARENT LEFT EXIT
C
300 IXMOV(1) = 1
IXMOV(2) = -1
IYMOV(1) = 0
IYMOV(2) = -1
GO TO 330
C
C APPARENT TOP EXIT
C
310 IXMOV(1) = 0
IXMOV(2) = -1
IYMOV(1) = -1
IYMOV(2) = 1
GO TO 330
C
C APPARENT RIGHT EXIT
C
320 IXMOV(1) = 1
IXMOV(2) = -1
IYMOV(1) = 0
IYMOV(2) = 1
C
C SEARCH THE POSSIBLE CELLS
C
330 DO 350 K=1,2
DO 340 L=1,2
XC = XCSTOR + STPSZ*FLOAT( IXMOV(K) )
YC = YCSTOR + STPSZ*FLOAT( IYMOV(L) )
IX = IXSTOR+IXMOV(K)
IY = IYSTOR+IYMOV(L)
ILOC = IOR(ISHIFT(IX,ISHFCT),IY)
C
C IF BACK TO START END CONTOUR
C
IF (IX.EQ.JX .AND. IY.EQ.JY) GO TO 170
C
C IF AT PREVIOUS CELL SKIP PROCESSING
C
IF (IX.EQ.IXSTP .AND. IY.EQ.IYSTP) GO TO 340
C
C COMPUTE CELL VALUES
C
TL = SCRTCH(IX-1,IY-1)
BL = SCRTCH(IX,IY-1)
TR = SCRTCH(IX-1,IY)
BL = SCRTCH(IX,IY)
ICASE = IC
CALL CONCLD (ICASE,NOOP)
IF (ICASE.EQ.-1) GO TO 360
IF (ICASE.NE.0) GO TO 70
C
C FAILURE TRY AGAIN
C
340 CONTINUE
350 CONTINUE
C
C NO MORE CONTOUR TRY OTHER END OF LINE
C
360 IF (LOOP.EQ.0) GO TO 170
LOOP = 0
IX = JX
IY = JY
TR = TRT
TL = TLT
BR = BRT
BL = BLT
IC = IFCASE
ICASE = IC
IOLDC = IFOCSE
XC = XI
YC = YI
IXSTOR = IX
IYSTOR = IY
YCSTOR = YI
XCSTOR = XI
XX = FX(FXO,FYO)
CALL LASTD
CALL FRSTD (XX,FY(FXO,FYO))
GO TO ( 90, 110, 130, 150),IC
END
|
