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107 lines
2.3 KiB
107 lines
2.3 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 PLTZCV(ZNEAR,ZFAR,N,MASK,PX,PY,PZ,QX,QY,QZ)
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INTEGER N
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INTEGER MASK(*)
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REAL PX(*)
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REAL PY(*)
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REAL PZ(*)
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REAL QX(*)
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REAL QY(*)
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REAL QZ(*)
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include 'izbit.inc'
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J = 0
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KM = 0
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DZ = ZFAR - ZNEAR
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2420 IF (.NOT. (J.LT.N)) GO TO 2430
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JN = MIN(N-J,32)
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J1 = J
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J = J + JN
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KM = KM + 1
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M = MASK(KM)
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IF (M.EQ.0) THEN
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GO TO 2420
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END IF
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DO 2440 K = 1,JN
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JB = IZBIT(K)
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IF (IAND(M,JB).EQ.0) THEN
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GO TO 2440
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END IF
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X1 = PX(K+J1)
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Y1 = PY(K+J1)
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Z1 = PZ(K+J1)
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X2 = QX(K+J1)
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Y2 = QY(K+J1)
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Z2 = QZ(K+J1)
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FP = Z1 - ZNEAR
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FQ = Z2 - ZNEAR
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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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GO TO 2440
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END IF
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IF (FP.GT.DZ .AND. FQ.GT.DZ) THEN
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M = IAND(M,NOT(JB))
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GO TO 2440
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END IF
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DF = FQ - FP
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IF (DF.GT.0.) THEN
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TN = (X2-X1)/DF
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SN = (Y2-Y1)/DF
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IF (FP.LT.0.) THEN
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Z1 = ZNEAR
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X1 = X1 - FP*TN
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Y1 = Y1 - FP*SN
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END IF
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IF (FQ.GT.DZ) THEN
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Z2 = ZFAR
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X2 = X2 + (DZ-FQ)*TN
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Y2 = Y2 + (DZ-FQ)*SN
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END IF
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ELSE IF (DF.LT.0.) THEN
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TN = (X2-X1)/DF
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SN = (Y2-Y1)/DF
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IF (FQ.LT.0.) THEN
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Z2 = ZNEAR
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X2 = X2 - FQ*TN
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Y2 = Y2 - FQ*SN
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END IF
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IF (FP.GT.DZ) THEN
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Z1 = ZFAR
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X1 = X1 + (DZ-FP)*TN
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Y1 = Y1 + (DZ-FP)*SN
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END IF
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END IF
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PX(K+J1) = X1
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PY(K+J1) = Y1
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PZ(K+J1) = Z1
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QX(K+J1) = X2
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QY(K+J1) = Y2
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QZ(K+J1) = Z2
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2440 CONTINUE
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MASK(KM) = M
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GO TO 2420
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2430 CONTINUE
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RETURN
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END
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