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98 lines
2.7 KiB
98 lines
2.7 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE PLTLI1(PLL,PUR,N,XV,YV,NO,XVO,YVO)
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CHARACTER*6 SUBNAM
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PARAMETER (SUBNAM='PLTLI1')
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DIMENSION PLL(2),PUR(2),XV(*),YV(*),XVO(*),YVO(*)
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DIMENSION P(2),S(2)
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LOGICAL INSIDE
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NMAX = NO
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NO = 0
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S(1) = XV(N)
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S(2) = YV(N)
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DO 2220 I = 1,N
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P(1) = XV(I)
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P(2) = YV(I)
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INSIDE = P(2) .GE. PLL(2)
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IF (INSIDE) THEN
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INSIDE = S(2) .GE. PLL(2)
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IF (INSIDE) THEN
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NO = NO + 1
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IF (NO.GT.NMAX) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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* 'Not enough space for output vertices; polygon clip unfinished'
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* ,2)
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RETURN
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END IF
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XVO(NO) = P(1)
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YVO(NO) = P(2)
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ELSE
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TEMP = PUR(1) - PLL(1)
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FP = (S(2)-PLL(2))*TEMP
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FQ = (P(2)-PLL(2))*TEMP
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XL = FQ/ (FQ-FP)
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NO = NO + 1
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IF (NO.GT.NMAX) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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* 'Not enough space for output vertices; polygon clip unfinished'
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* ,2)
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RETURN
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END IF
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XVO(NO) = P(1) + XL* (S(1)-P(1))
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YVO(NO) = P(2) + XL* (S(2)-P(2))
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NO = NO + 1
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IF (NO.GT.NMAX) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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* 'Not enough space for output vertices; polygon clip unfinished'
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* ,2)
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RETURN
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END IF
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XVO(NO) = P(1)
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YVO(NO) = P(2)
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END IF
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ELSE
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INSIDE = S(2) .GE. PLL(2)
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IF (INSIDE) THEN
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TEMP = PUR(1) - PLL(1)
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FP = (S(2)-PLL(2))*TEMP
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FQ = (P(2)-PLL(2))*TEMP
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XL = FQ/ (FQ-FP)
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NO = NO + 1
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IF (NO.GT.NMAX) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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* 'Not enough space for output vertices; polygon clip unfinished'
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* ,2)
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RETURN
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END IF
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XVO(NO) = P(1) + XL* (S(1)-P(1))
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YVO(NO) = P(2) + XL* (S(2)-P(2))
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END IF
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END IF
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S(1) = P(1)
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S(2) = P(2)
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2220 CONTINUE
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RETURN
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END
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