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SUBROUTINE POLYPT( LOCTOF,STEDGE,TR, NGRIDF,FLEDGE,FL,LOCFOS, EPS,
1 NPOLY,P)
C
C POLYPT DETERMINES PERIMETER POINTS OF AREA COMMON TO STRUCTURAL
C TRIANGLE BOUNDED BY TR POINTS AND FLUID ELEMENT BOUNDED BY
C (3 OR 4) FL POINTS
C
DOUBLE PRECISION P(2,7)
DOUBLE PRECISION TR(3,3), FL(3,4), SS(2), P1(2), EPS(2)
INTEGER STEDGE(2,3), FLEDGE(2,4), KEDGE(2,5), JEDGE(2,7)
1, LOCTOF(3), LOCFOS(4)
C
IP= 0
NPOLY= 0
C
DO 10 I=1,2
DO 10 J=1,7
10 P(I,J)= 0.D0
C
DO 20 K=1,3
IF ( LOCTOF(K) .LT. 0) GO TO 40
20 CONTINUE
C
C STRUCTURAL TRIANGLE IS COMMON AREA WHEN NO STR PTS LIE OUTSIDE
C FLUID ELEMENT BOUNDRY
IP= 3
DO 30 K=1,3
DO 30 I=1,2
30 P(I,K)= TR(I,K)
GO TO 9000
C
40 CONTINUE
C
K= NGRIDF -1
DO 50 I=1,2
DO 45 J=1,K
JEDGE(I,J)= FLEDGE(I,J)
45 JEDGE(I,J+NGRIDF)= FLEDGE(I,J)
50 JEDGE(I,NGRIDF)= FLEDGE(I,NGRIDF)
C
DO 60 I=1,2
DO 55 J=1,2
KEDGE(I,J)= STEDGE(I,J)
55 KEDGE(I,J+3)= STEDGE(I,J)
60 KEDGE(I,3)= STEDGE(I,3)
C
C
DO 100 K=1,3
K1= KEDGE(1,K)
K2= KEDGE(2,K)
DO 100 J=1,NGRIDF
J1= JEDGE(1,J)
J2= JEDGE(2,J)
CALL PTINTR( TR(1,K1),TR(1,K2), FL(1,J1),FL(1,J2), SS, INTER, EPS)
IF (INTER .EQ. 1) GO TO 200
100 CONTINUE
C
C - - AREAS ARE DISJOINT
GO TO 9000
C
C
200 JLAST= J
JJ1= J
JJ2= J +NGRIDF -1
KLAST= K
KK1= K +1
KK2= K+2
C
IF (LOCTOF(K1) .EQ. 1) GO TO 1800
C 1ST TRI POINT IS OUTSIDE FLUID BOUNDRY
P1(2)= SS(2)
P1(1)= SS(1)
AP1= (P1(1)-TR(1,K1))**2 +(P1(2)-TR(2,K1))**2
JP1= JLAST
JJ1= JLAST+1
C
DO 300 J=JJ1,JJ2
J1= JEDGE(1,J)
J2= JEDGE(2,J)
CALL PTINTR( TR(1,K1),TR(1,K2), FL(1,J1),FL(1,J2), SS, INTER, EPS)
IF (INTER .EQ. 1) GO TO 400
300 CONTINUE
C
IP= IP+1
P(1,IP)= P1(1)
P(2,IP)= P1(2)
GO TO 1000
C
400 AP2= (SS(1)-TR(1,K1))**2 + (SS(2)-TR(2,K1))**2
IF (AP1 .LT. AP2) GO TO 500
C
P(1,IP+1)= SS(1)
P(2,IP+1)= SS(2)
P(1,IP+2)= P1(1)
P(2,IP+2)= P1(2)
IP= IP+2
JLAST= JP1
GO TO 600
C
500 P(1,IP+1)= P1(1)
P(2,IP+1)= P1(2)
P(1,IP+2)= SS(1)
P(2,IP+2)= SS(2)
IP= IP+2
JLAST= J
C
600 CONTINUE
IF ( JLAST .GT. NGRIDF) JLAST= JLAST -NGRIDF
JJ1= JLAST
JJ2= JJ1 +NGRIDF -1
J2= JEDGE(2,JLAST)
GO TO 2000
C
C SEARCH ALONG LAST STRUCTURAL TRIANGLE EDGE FOR NEXT PTINTR
C
1000 IF ( LOCTOF(K2) .LT. 0) GO TO 1100
IF (TR(1,K2) .EQ. P(1,1) .AND. TR(2,K2) .EQ. P(2,1)) GO TO 9000
IP= IP+1
P(1,IP)= TR(1,K2)
P(2,IP)= TR(2,K2)
KLAST= KLAST +1
IF ( KLAST .EQ. KK2) GO TO 9000
K2= KEDGE(2,KLAST)
GO TO 1000
C
1100 CONTINUE
JJ1= JLAST
IF (JJ1 .GT. JJ2) GO TO 9000
DO 1150 J= JJ1,JJ2
J1= JEDGE(1,J)
J2= JEDGE(2,J)
CALL PTINTR( P(1,IP),TR(1,K2), FL(1,J1),FL(1,J2), SS, INTER, EPS)
IF ( INTER .EQ. 1) GO TO 1200
1150 CONTINUE
C
GO TO 9000
C
1200 IF (SS(1) .EQ. P(1,1) .AND. SS(2) .EQ. P(2,1)) GO TO 9000
IP= IP +1
P(1,IP)= SS(1)
P(2,IP)= SS(2)
JLAST= J
GO TO 2000
C
1800 P(1,IP+1)= TR(1,K1)
P(2,IP+1)= TR(2,K1)
P(1,IP+2)= SS(1)
P(2,IP+2)= SS(2)
IP= IP+2
C
C SEARCH ALONG LAST FLUID EDGE FOR NEXT PTINTR
C
2000 IF ( LOCFOS(J2) .LT. 0) GO TO 2100
IF (FL(1,J2) .EQ. P(1,1) .AND. FL(2,J2) .EQ. P(2,1)) GO TO 9000
IP= IP+1
P(1,IP)= FL(1,J2)
P(2,IP)= FL(2,J2)
JLAST= JLAST +1
IF ( JLAST .GT. JJ2) GO TO 9000
J2= JEDGE(2,JLAST)
GO TO 2000
C
2100 CONTINUE
KK1= KLAST
IF (KK1 .GT. KK2) GO TO 9000
DO 2150 K=KK1,KK2
K1= KEDGE(1,K)
K2= KEDGE(2,K)
CALL PTINTR( P(1,IP),FL(1,J2), TR(1,K1),TR(1,K2), SS, INTER, EPS)
IF ( INTER .EQ. 1) GO TO 2200
2150 CONTINUE
C
GO TO 9000
C
2200 IF (SS(1) .EQ. P(1,1) .AND. SS(2) .EQ. P(2,1)) GO TO 9000
IP= IP +1
P(1,IP)= SS(1)
P(2,IP)= SS(2)
KLAST= K
GO TO 1000
C
C
9000 CONTINUE
NPOLY= IP
RETURN
END
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