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47 lines
1.0 KiB
47 lines
1.0 KiB
2 years ago
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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 PLTCP2(N,MASK,PX,PY,C1,C2)
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DIMENSION MASK(*),PX(*),PY(*),C1(*),C2(*)
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include 'izbit.inc'
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CX = C1(1)
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CY = C1(2)
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DX = C2(1) - CX
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DY = C2(2) - CY
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J = 0
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KM = 0
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2020 IF (.NOT. (J.LT.N)) GO TO 2030
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JN = MIN(N-J,32)
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KM = 1 + KM
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J1 = J
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J = J + JN
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M = MASK(KM)
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IF (M.EQ.0) THEN
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GO TO 2020
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END IF
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DO 2040 K = 1,JN
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JB = IZBIT(K)
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IF (IAND(M,JB).NE.0) THEN
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FP = (PY(J1+K)-CY)*DX - (PX(J1+K)-CX)*DY
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IF (FP.LT.0.) THEN
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M = IAND(M,NOT(JB))
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END IF
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END IF
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2040 CONTINUE
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MASK(KM) = M
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GO TO 2020
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2030 CONTINUE
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RETURN
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END
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