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C	PLOTTER ROUTINES ,10(3210)
C	FORPLT - PART 1, FORTRAN ROUTINES
C
C
c***** Begin Revision History *****
c
c 1100	CKS
c	Convert back to Fortran, remove arithmetic IFs and Hollerith
c
c***** Begin Version 7 *****
c
c 3210	PLB
c	FORTRAN-77ization;  IF-THEN-ELSE, DO
c	CAXIS
c
c***** End Revision History *****

C COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1980, 1987
C ALL RIGHTS RESERVED.
C 
C THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
C ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH LICENSE AND WITH THE
C INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY  OTHER
C COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
C OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF THE  SOFTWARE  IS  HEREBY
C TRANSFERRED.
C
C THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT  NOTICE
C AND  SHOULD  NOT  BE  CONSTRUED  AS A COMMITMENT BY DIGITAL EQUIPMENT
C CORPORATION.
C
C DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY  OF  ITS
C SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.

	SUBROUTINE CAXIS (X,Y,CHREXP,SIGN,SIZE,THETA,YMIN,DY)
C   New 7(3210) [PLB]
C ARGS:
C   X,Y	 STARTING POINT OF AXIS, IN INCHES, WHERE THE LOWER LEFT CORNER
C	 OF THE PAGE IS (0,0)
C   CHREXP CHARACTER EXPRESSION TEXT LABEL FOR THE AXIS
C   SIGN DIRECTION FOR AXIS LABEL
C   SIZE LENGTH OF AXIS, INCHES
C   THETA ANGLE AT WHICH AXIS IS PLOTTED (0=HORIZONTAL, 90=VERTICAL)
C   XMIN X VALUE AT LEFT EDGE OF AXIS
C   DX	 X CHANGE IN 1 INCH

	CHARACTER*(*) CHREXP
	IF (SIGN .LT. 0) THEN
		SIGN = -1.
	ELSE
		SIGN = 1.
	END IF
	NAC=LEN(CHREXP)
	N=SIZE+.5
	CTH=COSD(THETA)
	STH=SIND(THETA)
	TN=N
	XB=X
	YB=Y
	XA=X-.1*SIGN*STH
	YA=Y+.1*SIGN*CTH
	CALL PLOT(XA,YA,3)
	DO I=1,N
		CALL PLOT(XB,YB,2)
		XC=XB+CTH
		YC=YB+STH
		CALL PLOT(XC,YC,2)
		XA=XA+CTH
		YA=YA+STH
		CALL PLOT(XA,YA,2)
		XB=XC
		YB=YC
	END DO
	EXP=0
	NT=INT(ALOG10(DY)+.001)
	IF (NT .LT. -1 .OR. NT .GT. 1) EXP = NT
	ADY=DY*10.**(-EXP)
	ABSV=YMIN*10.**(-EXP)+TN*ADY
	XA=XB-(.20*SIGN-.05)*STH-.0857*CTH
	YA=YB+(.20*SIGN-.05)*CTH-.0857*STH
	N=N+1
	DO I=1,N
		CALL NUMBER(XA,YA,.1,ABSV,THETA,3)
		ABSV=ABSV-ADY
		XA=XA-CTH
		YA=YA-STH
	END DO
	TNC=NAC+7
	XA=X+(SIZE/2.-.06*TNC)*CTH-(-.07+SIGN*.36)*STH
	YA=Y+(SIZE/2.-.06*TNC)*STH+(-.07+SIGN*.36)*CTH
	CALL SYMBOL(XA,YA,.12,CHREXP,THETA)
	XA=XA+((TNC-6.)*.12)*CTH
	YA=YA+((TNC-6.)*.12)*STH
	IF (EXP .NE. 0) THEN
		CALL SYMBOL(XA,YA,.12,'(*10  )',THETA)
		XA=XA+.48*CTH-.07*STH
		YA=YA+.48*STH+.07*CTH
		CALL NUMBER(XA,YA,.1,EXP,THETA,-1)
	END IF
	RETURN
	END

	SUBROUTINE AXIS (X,Y,BCD,NC,SIZE,THETA,YMIN,DY)

C ARGS:
C   X,Y	 STARTING POINT OF AXIS, IN INCHES, WHERE THE LOWER LEFT CORNER
C	 OF THE PAGE IS (0,0)
C   BCD	 TEXT LABEL FOR THE AXIS
C   NC	 NUMBER OF CHARACTERS IN BCD
C   SIZE LENGTH OF AXIS, INCHES
C   THETA ANGLE AT WHICH AXIS IS PLOTTED (0=HORIZONTAL, 90=VERTICAL)
C   XMIN X VALUE AT LEFT EDGE OF AXIS
C   DX	 X CHANGE IN 1 INCH

	DIMENSION BCD(2)
	SIGN = 1.
	IF (NC .LT. 0) SIGN = -1.
	NAC=IABS(NC)
	N=SIZE+.5
	CTH=COSD(THETA)
	STH=SIND(THETA)
	TN=N
	XB=X
	YB=Y
	XA=X-.1*SIGN*STH
	YA=Y+.1*SIGN*CTH
	CALL PLOT(XA,YA,3)
	DO I=1,N			![3210]
		CALL PLOT(XB,YB,2)
		XC=XB+CTH
		YC=YB+STH
		CALL PLOT(XC,YC,2)
		XA=XA+CTH
		YA=YA+STH
		CALL PLOT(XA,YA,2)
		XB=XC
		YB=YC
	END DO				![3210]
	EXP=0
	NT=INT(ALOG10(DY)+.001)
	IF (NT .LT. -1 .OR. NT .GT. 1) EXP = NT
	ADY=DY*10.**(-EXP)
	ABSV=YMIN*10.**(-EXP)+TN*ADY
	XA=XB-(.20*SIGN-.05)*STH-.0857*CTH
	YA=YB+(.20*SIGN-.05)*CTH-.0857*STH
	N=N+1
	DO I=1,N			![3210]
		CALL NUMBER(XA,YA,.1,ABSV,THETA,3)
		ABSV=ABSV-ADY
		XA=XA-CTH
		YA=YA-STH
	END DO				![3210]
	TNC=NAC+7
	XA=X+(SIZE/2.-.06*TNC)*CTH-(-.07+SIGN*.36)*STH
	YA=Y+(SIZE/2.-.06*TNC)*STH+(-.07+SIGN*.36)*CTH
	CALL SYMBOL(XA,YA,.12,BCD,THETA,NAC)
	XA=XA+((TNC-6.)*.12)*CTH
	YA=YA+((TNC-6.)*.12)*STH
	IF (EXP .NE. 0) THEN		![3210]
		CALL SYMBOL(XA,YA,.12,'(*10  )',THETA,7)
		XA=XA+.48*CTH-.07*STH
		YA=YA+.48*STH+.07*CTH
		CALL NUMBER(XA,YA,.1,EXP,THETA,-1)
	END IF				![3210]
	RETURN
	END

	SUBROUTINE LINE (X,Y,N,K)
	DIMENSION X(1),Y(1)
	I3=3
	DO I=1,N*K,K			![3210]
		CALL PLOT(X(I),Y(I),I3)
		I3=2
	END DO				![3210]
	END

	SUBROUTINE SCALE (X, N, S, XMIN, DX)
C ARGS:
C   X	INPUT ARRAY, RETURNED SCALED FOR PLOTTING
C   N   NUMBER OF ELEMENTS IN X
C   S   AXIS LENGTH IN INCHES
C   XMIN,DX  RETURNED SET UP FOR AXIS ROUTINE

	DIMENSION X(N)

	XMIN = X(1);  XMAX = X(1)
	DO I = 2,N			![3210]
		IF (X(I) .LT. XMIN) XMIN = X(I)
		IF (X(I) .GT. XMAX) XMAX = X(I)
	END DO				![3210]

	IF (XMIN .NE. XMAX) GO TO 20
	XMIN = 0;   XMAX = 2 * XMAX
	IF (XMAX .GT. 0) GO TO 20
	XMIN = XMAX;   XMAX = 0
	IF (XMIN .NE. 0) GO TO 20
	XMIN = -1;  XMAX = 1
20	CONTINUE

	T = (XMAX - XMIN) * 10 / S + XMIN
	D = T - XMIN
	E = ALOG10(D);  IE = E
	IF (E .LT. 0 .AND. E .NE. AINT(E)) IE = IE - 1
	T = D / 10.**IE

22	IF (T .LE. 8) THEN		![3210]
		IF (T .LE. 8) D = 8
		IF (T .LE. 5) D = 5
		IF (T .LE. 4) D = 4
		IF (T .LE. 2) D = 2
		IF (T .LE. 1) D = 1
	ELSE				![3210]
		IE = IE + 1;  D = 1
	END IF				![3210]

	DX = 10.**(IE-1) * D
	E = XMIN/DX
	IF (E .LT. 0 .AND. E .NE. AINT(E)) E = E - 1
	XMIN1 = DX * AINT(E)
	XMAX1 = XMIN1 + S*DX
	IF (XMIN1 .LE. XMIN .AND. XMAX1 .GE. XMAX) GO TO 40
	T = D*2
	IF (D .EQ. 4) T = 5
	GO TO 22

40	XMIN = XMIN1
	DO I = 1,N			![3210]
		X(I) = (X(I) - XMIN) / DX
	END DO				![3210]
	END