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|
C***********************************************************************
C Module: plt_util.f
C
C Copyright (C) 1996 Harold Youngren, Mark Drela
C
C This library is free software; you can redistribute it and/or
C modify it under the terms of the GNU Library General Public
C License as published by the Free Software Foundation; either
C version 2 of the License, or (at your option) any later version.
C
C This library is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
C Library General Public License for more details.
C
C You should have received a copy of the GNU Library General Public
C License along with this library; if not, write to the Free
C Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
C
C Report problems to: guppy@maine.com
C or drela@mit.edu
C***********************************************************************
C
***********************************************************************
C --- Xplot11 utility routines
C
C Version 4.46 11/28/01
C
C Note: These are additional routines that supply additional plot
C functionality. Included are routines for axis scaling,
C axis plotting, line or curve plotting, contours, etc.
C***********************************************************************
subroutine XAXIS(X1,Y1,XAXT,DXANN,FANN,DANN,CHT,NDIG)
C.......................................................
C
C X1,Y1 starting point of x axis
C XAXT length of x axis ( - = suppress zero annotation)
C DXANN distance between annotations
C FANN first annotation value
C DANN delta annotation value
C CHT character width ( - = annotation above axis)
C NDIG number of digits to right of decimal point
C = -1 no decimal point
C = -2 number of digits determined internally
C <= -3 no axis annotation (just hash marks)
C.......................................................
C
XAX = ABS(XAXT)
CH = ABS(CHT)
C
IF(NDIG.LE.-2) THEN
ADANN = ABS(DANN)
ND = MAX( 1 , INT(-LOG10(ADANN)) )
IF(ADANN*10**ND - AINT(ADANN*10**ND+0.01) .GT. 0.01) ND = ND + 1
IF(ADANN*10**ND - AINT(ADANN*10**ND+0.01) .GT. 0.01) ND = ND + 1
ELSE
ND = NDIG
ENDIF
C
CALL GETFACTORS(XFAC,YFAC)
CHX = CH
CHY = CH*XFAC/YFAC
C
C---- x-axis
CALL PLOT(X1,Y1,3)
CALL PLOT(X1+XAX,Y1,2)
C
C---- annotate x-axis
DO 10 NT=1, 12345
XT = X1 + DXANN*FLOAT(NT-1)
IF(XT-X1.GT.XAX+0.5*DXANN) GO TO 11
C---- hash marks
CALL PLOT(XT,Y1-0.2*CHY,3)
CALL PLOT(XT,Y1+0.2*CHY,2)
C---- Numeric annotations
IF(NDIG.LE.-3) GO TO 10
RN = FANN + DANN*FLOAT(NT-1)
IF(ABS(RN).LT.1.0E-5 .AND. XAXT.LT.0.0) GO TO 10
GRN = 0.
IF(RN.NE.0.0) GRN = LOG10(ABS(RN)+0.5/10.0**MAX(0,ND))
GRN = MAX(GRN,0.0)
NABC = INT(GRN) + 2 + ND
WIDTH = CHX*FLOAT(NABC)
IF(RN.LT.0.0) WIDTH = WIDTH + CHX
XNUM = XT - 0.5*WIDTH + 0.1*CHX
YNUM = Y1 - 2.1*CHY
IF(CHT.LT.0.0) YNUM = Y1 + 0.9*CHY
CALL PLNUMB(XNUM,YNUM,CH,RN,0.0,ND)
10 CONTINUE
11 CONTINUE
C
RETURN
END
subroutine YAXIS(X1,Y1,YAXT,DYANN,FANN,DANN,CHT,NDIG)
C.......................................................
C
C X1,Y1 starting point of y axis
C YAXT length of y axis ( - = suppress zero annotation)
C DYANN distance between annotations
C FANN first annotation value
C DANN delta annotation value
C CHT character width ( - = annotation on right side )
C NDIG number of digits to right of decimal point
C = -1 no decimal point
C = -2 number of digits determined internally
C <= -3 no axis annotation (just hash marks)
C.......................................................
C
YAX = ABS(YAXT)
CH = ABS(CHT)
C
IF(NDIG.LE.-2) THEN
ADANN = ABS(DANN)
ND = MAX( 1 , INT(-LOG10(ADANN)) )
IF(ADANN*10**ND - AINT(ADANN*10**ND+0.01) .GT. 0.01) ND = ND + 1
IF(ADANN*10**ND - AINT(ADANN*10**ND+0.01) .GT. 0.01) ND = ND + 1
ELSE
ND = NDIG
ENDIF
C
CALL GETFACTORS(XFAC,YFAC)
CHX = CH
CHY = CH*XFAC/YFAC
C
C---- y-axis
CALL PLOT(X1,Y1,3)
CALL PLOT(X1,Y1+YAX,2)
C
C---- annotate y-axis
DO 10 NT=1, 12345
YT = Y1 + DYANN*FLOAT(NT-1)
IF(YT-Y1.GT.YAX+0.5*DYANN) GO TO 11
C---- hash marks
CALL PLOT(X1-0.2*CHX,YT,3)
CALL PLOT(X1+0.2*CHX,YT,2)
C---- Numeric annotations
IF(NDIG.LE.-3) GO TO 10
RN = FANN + DANN*FLOAT(NT-1)
IF(ABS(RN).LT.1.0E-5 .AND. YAXT.LT.0.0) GO TO 10
GRN = 0.
IF(RN.NE.0.0) GRN = LOG10(ABS(RN)+0.5/10.0**MAX(0,ND))
GRN = MAX(GRN,0.0)
NABC = INT(GRN) + 2 + ND
WIDTH = CHX*FLOAT(NABC)
IF(RN.LT.0.0) WIDTH = WIDTH + CHX
XT = X1 - (0.6*CHX + WIDTH)
IF(CHT.LT.0.0) XT = X1 + CHX
CALL PLNUMB(XT,YT-0.5*CHY,CH,RN,0.0,ND)
10 CONTINUE
11 CONTINUE
C
RETURN
END
subroutine XYLINE(N,X,Y,XOFF,XWT,YOFF,YWT,ILIN)
C....................................................................
C
C...General XY polyline plotting routine with offsets and scaling
C
C...INPUT X, Y Input arrays of length N
C XOFF,XWT Offset and scale factor for X array...
C YOFF,YWT Offset and scale factor for Y array...
C Xplot = XWT*(X-XOFF)
C Yplot = YWT*(Y-YOFF)
C ILIN Selects line pattern
C
C...8 line patterns are available (repeat for ILIN>8)
C 1 ***************************** SOLID
C 2 **** **** **** **** **** **** LONG DASHED
C 3 ** ** ** ** ** ** ** ** ** ** SHORT DASHED
C 4 * * * * * * * * * * * * * * * DOTTED
C 5 ***** * ***** * ***** * ***** DASH-DOT
C 6 ***** * * ***** * * ***** * * DASH-DOT-DOT
C 7 ***** * * * ***** * * * ***** DASH-DOT-DOT-DOT
C 8 **** **** * * **** **** * * DASH-DASH-DOT-DOT
C
C....................................................................
DIMENSION X(N), Y(N)
C
DIMENSION NMOV(7), SMOV(8,7)
C
DATA NPAT / 8 /
DATA SCL1 / 0.125 /
DATA NMOV / 2, 2, 2, 4, 6, 8, 8 /
DATA SMOV /1.2, -.4, 0., 0., 0., 0., 0., 0.,
& .5, -.4, 0., 0., 0., 0., 0., 0.,
& .2, -.4, 0., 0., 0., 0., 0., 0.,
& 1.4, -.4, .2, -.4, 0., 0., 0., 0.,
& 1.4, -.4, .2, -.4, .2, -.4, 0., 0.,
& 1.4, -.4, .2, -.4, .2, -.4, .2, -.4,
& 1.2, -.4, 1.2, -.4, .2, -.4, .2, -.4 /
C
IF(N.LE.1) RETURN
C
C---- set line pattern scale based on current user scaling factors
CALL GETFACTORS(XSCALE,YSCALE)
SCL = SCL1 / SQRT(XSCALE*YSCALE)
C
NLIN = MAX(ILIN,1)
IPAT = MOD(NLIN-1,NPAT) + 1
C
X2 = XWT*(X(1)-XOFF)
Y2 = YWT*(Y(1)-YOFF)
CALL PLOT(X2,Y2,3)
C
IF (IPAT.EQ.1) THEN
C...Plot using continuous line
DO 10 I=2, N
X1 = X2
Y1 = Y2
X2 = XWT*(X(I)-XOFF)
Y2 = YWT*(Y(I)-YOFF)
CALL PLOT(X2,Y2,2)
10 CONTINUE
C
ELSE
C...Plot using stored patterns for lines
I = 1
S1 = 0.
S2 = 0.
S0 = 0.
C
20 DO 40 II=1, 99999
C
C...Pattern specifies pen up or down
IM = MOD(II+1,NMOV(IPAT-1)) + 1
IPEN = 3
IF(SMOV(IM,IPAT-1).GT.0.) IPEN = 2
C
DS = SCL*ABS(SMOV(IM,IPAT-1))
SPAT = S0 + DS
C
C...Find data interval containing pattern point
30 IF (SPAT.GE.S2 .AND. I+1.LE.N) THEN
I = I + 1
CALL PLOT(X2,Y2,IPEN)
X1 = X2
Y1 = Y2
S1 = S2
X2 = XWT*(X(I)-XOFF)
Y2 = YWT*(Y(I)-YOFF)
DS = SQRT((X2-X1)**2 + (Y2-Y1)**2)
S2 = S1 + DS
GO TO 30
ENDIF
C
C...Find point on interval using linear interpolation
IF (SPAT.GT.S2) SPAT = S2
IF(S2 .EQ. S1) THEN
FRAC = 0.0
ELSE
FRAC = (SPAT-S1)/(S2-S1)
ENDIF
XX = X1 + FRAC*(X2-X1)
YY = Y1 + FRAC*(Y2-Y1)
C
C...Move to new point using stored pattern to specify pen up or down
CALL PLOT(XX,YY,IPEN)
IF (I.GE.N .AND. SPAT.GE.S2) GO TO 50
S0 = SPAT
40 CONTINUE
C
50 CONTINUE
ENDIF
C
RETURN
END
subroutine XYSYMB(N,X,Y,XOFF,XWT,YOFF,YWT,SH,ISYM)
C.............................................................
C
C...GENERAL XY MULTIPLE-SYMBOL PLOTTING ROUTINE
C (useful for overplotting XYLINE plot with point symbols)
C
C...INPUT X, Y Input arrays of length N
C XOFF,XWT Offset and scale factor for X array
C YOFF,YWT Offset and scale factor for Y array
C SH Symbol size
C ISYM Selects symbol type
C if ISYM < 0 ... no plotting
C.............................................................
C
DIMENSION X(N), Y(N)
C
IF(ISYM.LT.0) RETURN
C
DO 10 I=1, N
XPLT = XWT*(X(I)-XOFF)
YPLT = YWT*(Y(I)-YOFF)
CALL PLSYMB(XPLT,YPLT,SH,ISYM,0.0,0)
10 CONTINUE
C
RETURN
END
subroutine CONT_GRID(IX,JX,II,JJ,X,Y,F,FCON,XOFF,YOFF,XWT,YWT)
DIMENSION X(IX,JX), Y(IX,JX), F(IX,JX)
CALL CONTGRID(IX,JX,II,JJ,X,Y,F,FCON,XOFF,YOFF,XWT,YWT)
RETURN
END
subroutine CONTGRID(IX,JX,II,JJ,X,Y,F,FCON,XOFF,YOFF,XWT,YWT)
DIMENSION X(IX,JX), Y(IX,JX), F(IX,JX)
C--------------------------------------------------------------------------
C
C Plots one contour of a function F on a logically rectangular grid.
C (normally called repeatedly if a number of contours is to be drawn)
C
C IX JX dimensions of arrays X, Y, F
C II JJ array limits of arrays X, Y, F
C X(i,j) independent coordinates of point (i,j)
C Y(i,j)
C F(i,j) function value at point (i,j)
C FCON value of F on the contour to be drawn
C XOFF offset for X
C YOFF offset for Y
C XWT scaling factor for X
C YWT scaling factor for Y
C
C XPLOT = (X - XOFF)*XWT
C YPLOT = (Y - YOFF)*YWT
C--------------------------------------------------------------------------
C
LOGICAL FOUND
C
C---- go over all cells and draw contour in any cell which contains the contour
DO 10 IO=1, II-1
IP = IO+1
C
DO 110 JO=1, JJ-1
JP = JO+1
C
FOUND = .FALSE.
C
C op 3 pp
C
C 4 2
C
C oo 1 po
C
XOO = X(IO,JO)
XOP = X(IO,JP)
XPO = X(IP,JO)
XPP = X(IP,JP)
C
YOO = Y(IO,JO)
YOP = Y(IO,JP)
YPO = Y(IP,JO)
YPP = Y(IP,JP)
C
FOO = F(IO,JO)
FOP = F(IO,JP)
FPO = F(IP,JO)
FPP = F(IP,JP)
C
C-------- bottom edge (side 1)
IF(FCON.GE.FOO .AND. FCON.LT.FPO .OR.
& FCON.LT.FOO .AND. FCON.GE.FPO ) THEN
XCON = XOO + (FCON-FOO)*(XPO-XOO)/(FPO-FOO)
YCON = YOO + (FCON-FOO)*(YPO-YOO)/(FPO-FOO)
IF(FOUND) THEN
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),2)
ELSE
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),3)
ENDIF
FOUND = .NOT.FOUND
ENDIF
C
C-------- left edge (side 4)
IF(FCON.GE.FOO .AND. FCON.LT.FOP .OR.
& FCON.LT.FOO .AND. FCON.GE.FOP ) THEN
XCON = XOO + (FCON-FOO)*(XOP-XOO)/(FOP-FOO)
YCON = YOO + (FCON-FOO)*(YOP-YOO)/(FOP-FOO)
IF(FOUND) THEN
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),2)
ELSE
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),3)
ENDIF
FOUND = .NOT.FOUND
ENDIF
C
C-------- right edge (side 2)
IF(FCON.GE.FPO .AND. FCON.LT.FPP .OR.
& FCON.LT.FPO .AND. FCON.GE.FPP ) THEN
XCON = XPO + (FCON-FPO)*(XPP-XPO)/(FPP-FPO)
YCON = YPO + (FCON-FPO)*(YPP-YPO)/(FPP-FPO)
IF(FOUND) THEN
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),2)
ELSE
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),3)
ENDIF
FOUND = .NOT.FOUND
ENDIF
C
C-------- top edge (side 3)
IF(FCON.GE.FOP .AND. FCON.LT.FPP .OR.
& FCON.LT.FOP .AND. FCON.GE.FPP ) THEN
XCON = XOP + (FCON-FOP)*(XPP-XOP)/(FPP-FOP)
YCON = YOP + (FCON-FOP)*(YPP-YOP)/(FPP-FOP)
IF(FOUND) THEN
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),2)
ELSE
CALL PLOT(XWT*(XCON-XOFF),YWT*(YCON-YOFF),3)
ENDIF
FOUND = .NOT.FOUND
ENDIF
C
110 CONTINUE
10 CONTINUE
C
RETURN
END
subroutine CONTQUAD(X,Y,F,
& FUPR,FLWR,
& NCU,XCU,YCU,
& NCL,XCL,YCL,
& NA,NE,NV,XP,YP)
C--------------------------------------------------------------------------
C Contour a single quadrilateral element between an upper and
C a lower contour limit. The output from this routine is both the
C line segments defining the upper and lower contours and a set of
C polygons that define the area of the element lying between the
C contour limits. These may be used to shade the area on a plot.
C
C X, Y Arrays containing quadrilateral coordinate data
C F Array containing the quantity F(x,y) to be contoured,
C ie. F(i) is defined at X(i),Y(i), i=1->4
C FUPR, FLWR Upper and lower contour limits
C NCU Number of upper limit contour line points
C XCU, YCU Arrays of x,y points (in pairs) on upper contour
C NCL Number of lower limit contour line points
C XCL, YCL Arrays of x,y points (in pairs) on lower contour
C NA Number of polygon areas in XP, YP, NE arrays
C NE Array of numbers of points in each polygon area
C NV Vertex count of points in XP,YP arrays
C XP, YP Coordinate points of contour polygons
C
C Note: the output contour line points on the upper contour (XCU,YCU)
C or lower contour (XCL,YCL) are only valid in point pairs, ie.
C points 1 and 2 define a segment, points 3 and 4 define the next,
C etc. In general, there is no guarantee that the cross-pair points
C (like points 2 and 3) will be contiguous. DO NOT PLOT THESE AS A
C CONTIGUOUS ARRAY OF POINTS.
C
C Note: the output areas (NA polygon areas) are stored with the points
C for all polygons in one big XP,YP array. The number of points
C in each polygon are stored in NE, i.e. NE(1) is the number of
C points stored in XP,YP for the first polygon, NE(2) is the number
C of vertices stored following those for the second polygon, etc.
C The total number of vertices is NV=sum[NE(1)+NE(2)..+NE(NA)].
C
C Note: the NCU,NCL,NA,NV counters are cumulative in this routine!
C If you want to contour each quadrilateral without accumulating
C contour points or polygons reset NCU=0,NCL=0,NA=0,NV=0 before
C each call to CONTQUAD.
C
C--------------------------------------------------------------------------
DIMENSION X(4), Y(4), F(4)
DIMENSION XP(1), YP(1), NE(1)
DIMENSION XCL(1), YCL(1), XCU(1), YCU(1)
C
DIMENSION IANG(4)
DIMENSION XTMP(3), YTMP(3), FTMP(3)
C
C---- NCU tracks the number of upper contour points
C NCL tracks the number of lower contour points
C NA tracks the number of polygon areas
C NV tracks the total number of stored vertices in the XP,YP arrays
C---- Uncomment these if you want to reset the counters each time you
C contour a quadrilateral
C NA = 0
C NV = 0
C NCU = 0
C NCL = 0
C
FHI = FUPR
FLO = FLWR
IF (FHI.LT.FLO) THEN
FHI = FLWR
FLO = FUPR
ENDIF
C
C---- Extrema
FMAX = AMAX1(F(1),F(2),F(3),F(4))
FMIN = AMIN1(F(1),F(2),F(3),F(4))
C
C---- If cell is above contour band or below contour band skip it
IF (FMAX.LE.FLO .OR. FMIN.GE.FHI) RETURN
C
C---- If cell is totally within contour band there are no contour lines,
C and cell can be shaded directly
IF (FMAX.LE.FHI .AND. FMIN.GE.FLO) THEN
DO 2 I = 1, 4
NV = NV + 1
XP(NV) = X(I)
YP(NV) = Y(I)
2 CONTINUE
NA = NA + 1
NE(NA) = 4
GO TO 100
ENDIF
C
C----Check for convex or concave quadrilaterals
ISUM = 0
DO 3 J = 1, 4
JM = MOD(J+2,4) + 1
JP = MOD(J, 4) + 1
IANG(J) = 1
IF ( (X(J)-X(JM))*(Y(JP)-Y(J)) .LT.
& (X(JP)-X(J))*(Y(J)-Y(JM)) ) IANG(J) = -1
ISUM = ISUM + IANG(J)
3 CONTINUE
DO 4 J = 1, 4
IF (IANG(J)*ISUM.LT.0) GO TO 10
4 CONTINUE
C
C----All angles < 180 deg., split into 4 triangles with average center pt
XTMP(3) = 0.25*(X(1)+X(2)+X(3)+X(4))
YTMP(3) = 0.25*(Y(1)+Y(2)+Y(3)+Y(4))
FTMP(3) = 0.25*(F(1)+F(2)+F(3)+F(4))
C
DO 5 I = 1, 4
IP = MOD(I,4) + 1
XTMP(1) = X(I)
YTMP(1) = Y(I)
FTMP(1) = F(I)
XTMP(2) = X(IP)
YTMP(2) = Y(IP)
FTMP(2) = F(IP)
CALL CONTTRI(XTMP,YTMP,FTMP,FHI,FLO,
& NCU,XCU,YCU,NCL,XCL,YCL,NA,NE,NV,XP,YP)
5 CONTINUE
GO TO 100
C
C----Quadrilaterals with an angle > 180, two triangles
10 XTMP(3) = X(J)
YTMP(3) = Y(J)
FTMP(3) = F(J)
C
JP1 = MOD(J,4) + 1
XTMP(1) = X(JP1)
YTMP(1) = Y(JP1)
FTMP(1) = F(JP1)
JP2 = MOD(JP1,4) + 1
XTMP(2) = X(JP2)
YTMP(2) = Y(JP2)
FTMP(2) = F(JP2)
CALL CONTTRI(XTMP,YTMP,FTMP,FHI,FLO,
& NCU,XCU,YCU,NCL,XCL,YCL,NA,NE,NV,XP,YP)
C
JM2 = MOD(JM+1,4) + 1
XTMP(1) = X(JM2)
YTMP(1) = Y(JM2)
FTMP(1) = F(JM2)
JM1 = MOD(JM2,4) + 1
XTMP(2) = X(JM1)
YTMP(2) = Y(JM1)
FTMP(2) = F(JM1)
CALL CONTTRI(XTMP,YTMP,FTMP,FHI,FLO,
& NCU,XCU,YCU,NCL,XCL,YCL,NA,NE,NV,XP,YP)
C
100 RETURN
END
subroutine CONTTRI(X,Y,F,
& FUPR,FLWR,
& NCU,XCU,YCU,
& NCL,XCL,YCL,
& NA,NE,NV,XP,YP)
C
C Contour a single triangular element between an upper and
C a lower contour limit. The output from this routine is both the line
C segments defining the upper and lower contours and a set of
C polygons that define the area of the element lying between the
C contour limits. These may be used to shade the area on a plot.
C
C X, Y, Arrays containing triangular element points
C F Array containing the quantity F(x,y) to be contoured,
C ie. F(i) is defined at X(i),Y(i), i=1->3
C FUPR, FLWR Upper and lower contour limits
C NCU Number of upper limit contour line points
C XCU, YCU Arrays of x,y points on upper contour
C NCL Number of lower limit contour line points
C XCL, YCL Arrays of x,y points on lower contour
C NA Number of polygon areas in XP, YP, NE arrays
C NE Array of numbers of points in each polygon area
C NV Vertex count of points in XP,YP arrays
C XP, YP Coordinate points of contour polygons
C
C Note: the output contour line points on the upper contour (XCU,YCU)
C or lower contour (XCL,YCL) are only valid in point pairs, ie.
C points 1 and 2 define a segment, points 3 and 4 define the next,
C etc. In general, there is no guarantee that the cross-pair points
C (like points 2 and 3) will be contiguous. DO NOT PLOT THESE AS A
C CONTIGUOUS ARRAY OF POINTS.
C
C Note: the output areas (NA polygons) are stored with the points
C for all polys in one big XP,YP array. The number of points
C in each polygon are stored in NE, i.e. NE(1) is the number of
C points stored in XP,YP for the first polygon, NE(2) is the number
C of vertices stored following those for the second polygon, etc.
C The total number of vertices is NV=sum[NE(1)+NE(2)..+NE(NA)].
C
C Note: the NCU,NCL,NA,NV counters are cumulative in this routine!
C If you want to contour each triangle without accumulating
C contour points or polygons reset NCU=0,NCL=0,NA=0,NV=0 before
C each call to CONTTRI.
C
DIMENSION X(3), Y(3), F(3), FH(3), FL(3),
& XCU(1), YCU(1), XCL(1), YCL(1), XP(1), YP(1), NE(1)
C
C---- NCU tracks the number of upper contour points
C NCL tracks the number of lower contour points
C NA tracks the number of polygon areas
C NV tracks the total number of stored vertices in the XP,YP arrays
C---- Uncomment these if you want to reset the counters each time you
C contour a triangle
C NA = 0
C NV = 0
C NCU = 0
C NCL = 0
C
FHI = FUPR
FLO = FLWR
IF (FHI.LT.FLO) THEN
FHI = FLWR
FLO = FUPR
ENDIF
NVFRST = NV
C
EPS = 0.0001*(FHI-FLO)
C
C---- Temporary values
DO 1 I = 1, 3
FH(I) = F(I) - FHI
FL(I) = F(I) - FLO
IF (FH(I).GE.0. .AND. FH(I).LT. EPS) FH(I) = EPS
IF (FH(I).LE.0. .AND. FH(I).GT.-EPS) FH(I) = -EPS
IF (FL(I).GE.0. .AND. FL(I).LT. EPS) FL(I) = EPS
IF (FL(I).LE.0. .AND. FL(I).GT.-EPS) FL(I) = -EPS
1 CONTINUE
C
C----Check point by point for points in contour limits
DO 50 I = 1, 3
C
C----Inside contour limits
IF (FH(I).LT.0. .AND. FL(I).GT.0.) THEN
NV = NV + 1
XP(NV) = X(I)
YP(NV) = Y(I)
C
ELSE
C
IF (FH(I).GE.0.) THEN
C----Check for intersections with previous and next point
IP = MOD(I,3) + 1
IM = MOD(I+1,3) + 1
IF (FH(IM).LT.0.) THEN
ETA = -(FH(IM)+FH(I))/(FH(IM)-FH(I))
NCU = NCU + 1
XCU(NCU) = 0.5*(X(I) + X(IM) + ETA*(X(IM)-X(I)) )
YCU(NCU) = 0.5*(Y(I) + Y(IM) + ETA*(Y(IM)-Y(I)) )
NV = NV + 1
XP(NV) = XCU(NCU)
YP(NV) = YCU(NCU)
ENDIF
IF (FH(IP).LT.0.) THEN
ETA = -(FH(IP)+FH(I))/(FH(IP)-FH(I))
NCU = NCU + 1
XCU(NCU) = 0.5*(X(I) + X(IP) + ETA*(X(IP)-X(I)) )
YCU(NCU) = 0.5*(Y(I) + Y(IP) + ETA*(Y(IP)-Y(I)) )
NV = NV + 1
XP(NV) = XCU(NCU)
YP(NV) = YCU(NCU)
ENDIF
ENDIF
C
IF (FL(I).LE.0.) THEN
C----Check for intersections with previous and next point
IP = MOD(I,3) + 1
IM = MOD(I+1,3) + 1
IF (FL(IM).GT.0.) THEN
ETA = -(FL(IM)+FL(I))/(FL(IM)-FL(I))
NCL = NCL + 1
XCL(NCL) = 0.5*(X(I) + X(IM) + ETA*(X(IM)-X(I)) )
YCL(NCL) = 0.5*(Y(I) + Y(IM) + ETA*(Y(IM)-Y(I)) )
NV = NV + 1
XP(NV) = XCL(NCL)
YP(NV) = YCL(NCL)
ENDIF
IF (FL(IP).GT.0.) THEN
ETA = -(FL(IP)+FL(I))/(FL(IP)-FL(I))
NCL = NCL + 1
XCL(NCL) = 0.5*(X(I) + X(IP) + ETA*(X(IP)-X(I)) )
YCL(NCL) = 0.5*(Y(I) + Y(IP) + ETA*(Y(IP)-Y(I)) )
NV = NV + 1
XP(NV) = XCL(NCL)
YP(NV) = YCL(NCL)
ENDIF
ENDIF
C
ENDIF
C
50 CONTINUE
C
IF (NV.GT.NVFRST+2) THEN
NA = NA + 1
NE(NA) = NV - NVFRST
ENDIF
C
RETURN
END
subroutine AXISADJ(xmin,xmax,xspan,deltax,ntics)
C...Make scaled axes with engineering increments between tics
C
C Input: xmin, xmax - input range for which scaled axis is desired
C
C Output: xmin, xmax - adjusted range for scaled axis
C xspan - adjusted span of scaled axis
C deltax - increment to be used for scaled axis
C nincr - number of tics to be used on axis
C note that ntics=1+(xspan/deltax)
C
real xmin,xmax,xspan,deltax,xinc,xinctbl(5)
integer ntics,i
data xinctbl / 0.1, 0.2, 0.25, 0.5, 1. /
c
xspan1 = xmax-xmin
if (xspan1.eq.0.) xspan1 = 1.
c
xpon = ifix(log10(xspan1))
xspan = xspan1 / 10.**xpon
c
do i = 1, 5
xinc = xinctbl(i)
ntics = 1 + ifix(xspan/xinc + 0.1)
if (ntics.LE.6) go to 1
end do
c
1 deltax = xinc*10.**xpon
xmin = deltax* ifloor(xmin/deltax)
xmax = deltax*iceiling(xmax/deltax)
xspan = xmax - xmin
ntics = 1 + ifix(xspan/deltax + 0.1)
return
end
function iceiling(x)
c--- returns next highest integer value if fraction is non-zero
integer iceiling
real x
i = ifix(x)
if(x-i.GT.0.) i = i+1
iceiling = i
return
end
function ifloor(x)
c--- returns next lowest integer value if fraction is negative, non-zero
integer ifloor
real x
i = ifix(x)
if(x-i.LT.0.) i = i-1
ifloor = i
return
end
subroutine ANNOT(CH)
C------------------------------------------------------
C Interactive annotation menu for adding custom
C ornaments to an active plot (before PLEND call).
C------------------------------------------------------
CHARACTER*80 AA
CHARACTER*1 OPT, KCHAR
C
SAVE CHF, ISYMB
DATA CHF, ISYMB / 1.0, 0 /
C
900 CONTINUE
C
1000 FORMAT(A)
1010 FORMAT(A,$)
1020 FORMAT(A,F7.3,A,$)
1030 FORMAT(A,I2 ,A,$)
C
WRITE(*,1050)
1050 FORMAT(/' C haracters | '
& /' S lant characters | '
& /' M ath characters | plot '
& /' P oint symbol | '
& /' L ine | '
& /' A rrow | '
& /' '
& /' W idth of characters | modify'
& /' T ype of point symbol | ')
C
905 WRITE(*,*)
WRITE(*,1010) ' Select option or <return>: '
READ(*,1000) OPT
IF(OPT.EQ.' ') RETURN
C
CHI = CHF*CH
C
C-------------------------------------------------------------
IF(INDEX('CcSsMm',OPT).NE.0) THEN
C
WRITE(*,*) 'Click on lower left point of character string...'
CALL GETCURSORXY(XX,YY,KCHAR)
WRITE(*,1010) ' Enter character string: '
READ (*,1000) AA
C
C---- find index of last non-blank character
DO 112 NA=80, 1, -1
IF(AA(NA:NA).NE.' ') GO TO 113
112 CONTINUE
113 CONTINUE
C
CALL NEWPEN(3)
IF(INDEX('Cc',OPT).NE.0) CALL PLCHAR(XX,YY,CHI,AA,0.0,NA)
IF(INDEX('Ss',OPT).NE.0) CALL PLSLAN(XX,YY,CHI,AA,0.0,NA)
IF(INDEX('Mm',OPT).NE.0) CALL PLMATH(XX,YY,CHI,AA,0.0,NA)
CALL PLFLUSH
C
C-------------------------------------------------------------
ELSE IF(INDEX('Pp',OPT).NE.0) THEN
C
WRITE(*,*) 'Click on symbol locations ...'
CALL GETCURSORXY(XX,YY,KCHAR)
CALL NEWPEN(2)
CALL PLSYMB(XX,YY,CHI,ISYMB,0.0,0)
CALL PLFLUSH
C
C-------------------------------------------------------------
ELSE IF(INDEX('LlAa',OPT).NE.0) THEN
C
WRITE(*,*) 'Click on line points, twice on last point...'
C
CALL NEWPEN(1)
CALL GETCURSORXY(XXM,YYM,KCHAR)
CALL PLOT(XXM,YYM,3)
CALL PLOT(XXM,YYM,2)
XXL = XXM
YYL = YYM
CALL PLFLUSH
DO 131 IP=1, 12345
CALL GETCURSORXY(XX,YY,KCHAR)
CALL PLOT(XX,YY,2)
CALL PLFLUSH
IF(XXM.EQ.XX .AND. YYM.EQ.YY) GO TO 132
XXL = XXM
YYL = YYM
XXM = XX
YYM = YY
131 CONTINUE
132 CONTINUE
C
IF(INDEX('Aa',OPT).NE.0) THEN
C------ add arrowhead
DX = XX - XXL
DY = YY - YYL
DS = SQRT(DX**2 + DY**2)
ARLEN = 1.5*CHI
HAR = 0.1
cc IF(DS .GT. ARLEN) THEN
CALL PLOT(XX-ARLEN*(DX+HAR*DY)/DS,YY-ARLEN*(DY-HAR*DX)/DS,2)
CALL PLOT(XX-ARLEN*(DX-HAR*DY)/DS,YY-ARLEN*(DY+HAR*DX)/DS,2)
CALL PLOT(XX,YY,2)
cc ENDIF
ENDIF
C
XX = XX + 0.7*CHI
YY = YY - 0.5*CHI
CALL PLFLUSH
C
C-------------------------------------------------------------
ELSE IF(INDEX('Ww',OPT).NE.0) THEN
C
140 WRITE(*,1020)
& ' Enter new character width factor (currently =',CHF,'): '
READ (*,*,ERR=140) CHF
C
C-------------------------------------------------------------
ELSE IF(INDEX('Tt',OPT).NE.0) THEN
C
WRITE(*,*)
WRITE(*,*) ' 0 square 7 Y '
WRITE(*,*) ' 1 circle 8 flipped Y '
WRITE(*,*) ' 2 triangle 9 * '
WRITE(*,*) ' 3 + 10 flipped * '
WRITE(*,*) ' 4 x 11 hourglass '
WRITE(*,*) ' 5 diamond 12 bowtie '
WRITE(*,*) ' 6 yield sign 13 star '
WRITE(*,*)
160 WRITE(*,1030) ' Enter new symbol type (currently =',ISYMB,'): '
READ (*,*,ERR=160) ISYMB
C
C-------------------------------------------------------------
ELSE
C
GO TO 900
C
ENDIF
C
GO TO 905
END ! ANNOT
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