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69 lines
1.6 KiB
69 lines
1.6 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 PLTCV2(N,MASK,PX,PY,QX,QY,PPX,PPY,QQX,QQY,C1,C2)
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DIMENSION MASK(*),PX(*),PY(*),QX(*),QY(*),PPX(*),PPY(*),QQX(*),
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* QQY(*),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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2100 IF (.NOT. (J.LT.N)) GO TO 2110
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JN = MIN(N-J,32)
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J1 = J
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KM = KM + 1
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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 2100
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END IF
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DO 2120 K = 1,JN
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JB = IZBIT(K)
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IF (IAND(JB,M).EQ.0) THEN
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GO TO 2120
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END IF
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X1 = PX(J1+K)
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Y1 = PY(J1+K)
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X2 = QX(J1+K)
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Y2 = QY(J1+K)
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FP = (Y1-CY)*DX - (X1-CX)*DY
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FQ = (Y2-CY)*DX - (X2-CX)*DY
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IF (FP.LT.0. .AND. FQ.LT.0.) THEN
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M = IAND(M,NOT(JB))
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ELSE IF (FP.LT.0.) THEN
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XL = FQ/ (FQ-FP)
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X1 = X2 + XL* (X1-X2)
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Y1 = Y2 + XL* (Y1-Y2)
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ELSE IF (FQ.LT.0.) THEN
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XL = FP/ (FP-FQ)
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X2 = X1 + XL* (X2-X1)
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Y2 = Y1 + XL* (Y2-Y1)
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END IF
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PPX(K+J1) = X1
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PPY(K+J1) = Y1
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QQX(K+J1) = X2
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QQY(K+J1) = Y2
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2120 CONTINUE
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MASK(KM) = M
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GO TO 2100
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2110 CONTINUE
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RETURN
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END
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