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SUBROUTINE TISOHR (IERROR)
C
C LATEST REVISION JULY 1984
C
C PURPOSE TO PROVIDE A SIMPLE DEMONSTRATION OF
C THE ISOSRFHR PACKAGE
C
C USAGE CALL TISOHR (IERROR)
C
C ARGUMENTS
C
C ON OUTPUT IERROR
C AN INTEGER VARIABLE
C =0 IF THERE IS A NORMAL EXIT FROM THE
C ISOSRFHR ROUTINES
C =1 OTHERWISE
C
C I/O THIS ROUTINE REQUIRES UNIT IUNIT FOR SCRATCH
C PURPOSES. USERS SHOULD PUT THE UNITS LABELLED
C COMMON (SEE BELOW) IN THE CALLING PROGRAM,
C AND ALSO SET THE VALUE OF THE COMMON VARIABLE
C IUNIT IN THE CALLING PROGRAM.
C
C IF THERE IS A NORMAL EXIT FROM THE
C ISOSRFHR ROUTINES THE MESSAGE
C ISOSRFHR TEST SUCCESSFUL . . . SEE PLOT TO
C VERIFY PERFORMANCE
C IS PRINTED.
C
C ALSO, A SAMPLE PLOT IS
C PRODUCED ON THE MACHINE GRAPHICS
C DEVICE. ONE MUST EXAMINE THIS PLOT
C TO DETERMINE IF THE ROUTINES HAVE
C EXECUTED CORRECTLY.
C
C COMMON BLOCKS UNITS
C
C PRECISION SINGLE
C
C REQUIRED LIBRARY ISOSRFHR
C FILES
C
C LANGUAGE FORTRAN
C
C ALGORITHM THIS SUBROUTINE USES THE ROUTINES IN
C THE PACKAGE ISOSRFHR TO DRAW A PERSPECTIVE
C DRAWING OF TWO INTERLOCKING DOUGHNUTS
C
C PORTABILITY ANSI STANDARD
C
C
DIMENSION EYE(3) ,S(4) ,IS2(4,200) ,
1 ST1(81,51,2) ,IOBJS(81,51)
COMMON /UNITS/ IUNIT
C
C SPECIFY COORDINATES FOR PLOT TITLES. ON AN ABSTRACT GRID WHERE
C THE INTEGER COORDINATES RANGE FROM 1 TO 1024, THE VALUES IX AND IY
C DEFINE THE CENTER OF THE TITLE STRING.
C
DATA IX/448/, IY/990/
C
C
C DEFINE THE EYE POSITION
C
DATA EYE(1), EYE(2), EYE(3) / 200., 250., 250. /
C
C DEFINE THE OVERALL DIMENSION OF THE BOX CONTAINING THE OBJECTS
C
DATA NU, NV, NW / 51, 81, 51 /
C
C SPECIFY THE DIMENSIONS OF THE MODEL OF THE IMAGE PLANE
C
DATA LX, NX, NY / 4, 180, 180 /
C
C SPECIFY CRT COORDINATES OF THE AREA WHERE THE PICTURE
C IS TO BE DRAWN
C
DATA S(1),S(2),S(3),S(4)/ 10.,1010.,10.,1010./
DATA MV / 81 /
C
C SPECIFY THE LARGE AND SMALL RADII FOR THE INDIVIDUAL DOUGHNUTS
C
DATA RBIG1,RBIG2,RSML1,RSML2/ 20., 20., 6., 6. /
C
SAVE
C
C CALL THE INITIALIZATION ROUTINE
C
CALL INIT3D (EYE,NU,NV,NW,ST1,LX,NY,IS2,IUNIT,S)
C
C INITIALIZE THE ERRROR FLAG
C
IERROR = 1
C
C CREATE AND PLOT DATA FOR TWO INTERLOCKING DOUGHNUTS
C
JCENT1 = FLOAT(NV)*.5-RBIG1*.5
JCENT2 = FLOAT(NV)*.5+RBIG2*.5
DO 70 IBKWDS=1,NU
I = NU+1-IBKWDS
C
C CREATE THE I-TH CROSS SECTION IN THE U DIRECTION OF THE
C THREE-DIMENSIONAL ARRAY AND STORE IN IOBJS AS ZEROS AND ONES
C
FIMID = I-NU/2
DO 20 J=1,NV
FJMID1 = J-JCENT1
FJMID2 = J-JCENT2
DO 10 K=1,NW
FKMID = K-NW/2
F1 = SQRT(RBIG1*RBIG1/(FJMID1*FJMID1+FKMID*FKMID+.1))
F2 = SQRT(RBIG2*RBIG2/(FIMID*FIMID+FJMID2*FJMID2+.1))
FIP1 = (1.-F1)*FIMID
FIP2 = (1.-F2)*FIMID
FJP1 = (1.-F1)*FJMID1
FJP2 = (1.-F2)*FJMID2
FKP1 = (1.-F1)*FKMID
FKP2 = (1.-F2)*FKMID
TEMP = AMIN1(FIMID**2+FJP1**2+FKP1**2-RSML1**2,
1 FKMID**2+FIP2**2+FJP2**2-RSML2**2)
IF (TEMP .LE. 0.) IOBJS(J,K) = 1
IF (TEMP .GT. 0.) IOBJS(J,K) = 0
10 CONTINUE
20 CONTINUE
C
C SET PROPER WORDS TO 1 FOR DRAWING AXES
C
IF (I .NE. 1) GO TO 50
DO 30 K=1,NW
IOBJS(1,K) = 1
30 CONTINUE
DO 40 J=1,NV
IOBJS(J,1) = 1
40 CONTINUE
GO TO 60
50 CONTINUE
IOBJS(1,1) = 1
60 CONTINUE
C
C CALL THE DRAW AND REMEMBER ROUTINE FOR THIS SLAB
C
CALL DANDR (NV,NW,ST1,LX,NX,NY,IS2,IUNIT,S,IOBJS,MV)
70 CONTINUE
C
C TITLE THE PLOT
C
CALL GQCNTN(IER,ICN)
CALL GSELNT(0)
XC = PAU2FX(IX)
YC = PAU2FY(IY)
CALL WTSTR(XC,YC,'DEMONSTRATION PLOT FOR ISOSRFHR',2,0,0)
CALL GSELNT(ICN)
C
C ADVANCE THE PLOTTING DEVICE
C
c CALL NEWFM
C
IERROR = 0
c WRITE (6,1001)
RETURN
C
c1001 FORMAT (' ISOSRFHR TEST SUCCESSFUL',24X,
c 1 'SEE PLOT TO VERIFY PERFORMANCE')
C
END
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