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*DECK XCWREC
SUBROUTINE XCWREC(ANGD,SIDE,TRKPOS,LINTER,ROTPOS,INDS,IMS)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Track outer rectangle for 2-D cluster.
*
*Copyright:
* Copyright (C) 1992 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): G.Marleau
*
*Parameters: input
* ANGD track director cosines (cos(a),sin(a)).
* SIDE side of rectangle.
* IMS surface merge.
*
*Parameters: input/output
* TRKPOS one track point at input (*,1).
* Track origin at output (*,1).
* Track origin at input (*,2).
*
*Parameters: output
* LINTER intersection logical.
* ROTPOS position wrt rotated axis.
* INDS surface of intersection.
*
*----------------------------------------------------------------------
*
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DOUBLE PRECISION ANGD(2),SIDE(2),TRKPOS(2,2),ROTPOS(2,2)
INTEGER IMS(6),INDS(2)
LOGICAL LINTER
*----
* EQUATIONS FOR SIDES
* SIDE 1: XR= SIDE(1)/2 (-SIDE(2)/2<=YR<=SIDE(2)/2)
* SIDE 2: YR= SIDE(2)/2 (-SIDE(1)/2<=XR<=SIDE(1)/2)
* SIDE 3: XR=-SIDE(1)/2 (-SIDE(2)/2<=YR<=SIDE(2)/2)
* SIDE 4: YR=-SIDE(2)/2 (-SIDE(1)/2<=XR<=SIDE(1)/2)
* TRACK EQUATION
* YR= TAN(ANGD)*(XR-TRKPOS(1,1))+TRKPOS(2,1)
* OR XR=COTAN(ANGD)*(YR-TRKPOS(2,1))+TRKPOS(1,1)
*----
YTOP=0.5D0*SIDE(2)
XTOP=0.5D0*SIDE(1)
LINTER=.FALSE.
IF(ANGD(1).EQ.0.0D0) THEN
*----
* TRACK PARALLEL TO Y
* TRACK INTERCEPT SURFACE 4 AND 2
*----
IF(ABS(TRKPOS(1,1)).LT.XTOP) THEN
TRKPOS(1,2)=TRKPOS(1,1)
IF(ANGD(2).LT.0.0) THEN
INDS(2)=IMS(4)
INDS(1)=IMS(2)
TRKPOS(2,2)=-YTOP
TRKPOS(2,1)=YTOP
ELSE
INDS(2)=IMS(2)
INDS(1)=IMS(4)
TRKPOS(2,2)=YTOP
TRKPOS(2,1)=-YTOP
ENDIF
LINTER=.TRUE.
ENDIF
ELSE IF(ANGD(2).EQ.0.0D0) THEN
*----
* TRACK PARALLEL TO X
* TRACK INTERCEPT SURFACE 3 AND 1
*----
IF(ABS(TRKPOS(2,1)).LT.YTOP) THEN
TRKPOS(2,2)=TRKPOS(2,1)
IF(ANGD(1).LT.0.0D0) THEN
INDS(2)=IMS(3)
INDS(1)=IMS(1)
TRKPOS(1,2)=-XTOP
TRKPOS(1,1)=XTOP
ELSE
INDS(2)=IMS(1)
INDS(1)=IMS(3)
TRKPOS(1,2)=XTOP
TRKPOS(1,1)=-XTOP
ENDIF
LINTER=.TRUE.
ENDIF
ELSE
NSEG=1
COSAI=1.0/ANGD(1)
SINAI=1.0/ANGD(2)
*----
* SLOPEY=TAN(ANGD)
* SLOPEX=COTAN(ANGD)
* RINTY=TRKPOS(2,1)-SLOPEY*TRKPOS(1,1)
* RINTX=TRKPOS(1,1)-SOLPEX*TRKPOS(2,1)
*----
SLOPEY=ANGD(2)*COSAI
SLOPEX=ANGD(1)*SINAI
RINTY=TRKPOS(2,1)-SLOPEY*TRKPOS(1,1)
RINTX=TRKPOS(1,1)-SLOPEX*TRKPOS(2,1)
*----
* SURFACE 3: YR=RINTY-SLOPEY*XTOP
* (-YTOP <=YR<= YTOP)
*----
TRKPOS(2,NSEG)=RINTY-SLOPEY*XTOP
IF( ABS(TRKPOS(2,NSEG)).LE.YTOP ) THEN
*----
* TRACK INTERSEPT SURFACE 3
*----
INDS(NSEG)=IMS(3)
TRKPOS(1,NSEG)=-XTOP
NSEG=NSEG+1
ENDIF
*----
* SURFACE 1: YR=RINTY+SLOPEY*XTOP
* (-YTOP <=YR<= YTOP)
*----
TRKPOS(2,NSEG)=RINTY+SLOPEY*XTOP
IF( ABS(TRKPOS(2,NSEG)).LE.YTOP ) THEN
*----
* TRACK INTERSEPT SURFACE 1
*----
INDS(NSEG)=IMS(1)
TRKPOS(1,NSEG)=XTOP
IF(NSEG.EQ.2) GO TO 100
NSEG=NSEG+1
ENDIF
*----
* SURFACE 4: XR=RINTX-SLOPEX*YTOP
* (-XTOP <=XR<= XTOP)
*----
TRKPOS(1,NSEG)=RINTX-SLOPEX*YTOP
IF( ABS(TRKPOS(1,NSEG)).LE.XTOP ) THEN
*----
* TRACK INTERSEPT SURFACE 4
*----
INDS(NSEG)=IMS(4)
TRKPOS(2,NSEG)=-YTOP
IF(NSEG.EQ.2) GO TO 100
NSEG=NSEG+1
ENDIF
*----
* SURFACE 2: XR=RINTX+SLOPEX*YTOP
* (-XTOP <=XR<= XTOP)
*----
TRKPOS(1,NSEG)=RINTX+SLOPEX*YTOP
IF( ABS(TRKPOS(1,NSEG)).LE.XTOP ) THEN
*----
* TRACK INTERSEPT SURFACE 2
*----
INDS(NSEG)=IMS(2)
TRKPOS(2,NSEG)=YTOP
IF(NSEG.EQ.2) GO TO 100
NSEG=NSEG+1
ENDIF
100 CONTINUE
IF(NSEG.EQ.2) THEN
LINTER=.TRUE.
*----
* REORDER INTERSECTION POINTS FOR DIRECTION
*----
IF(ANGD(1).LT.0.0D0) THEN
IF(TRKPOS(1,1).GT.TRKPOS(1,2)) THEN
TRKTMP=TRKPOS(1,2)
TRKPOS(1,2)=TRKPOS(1,1)
TRKPOS(1,1)=TRKTMP
TRKTMP=TRKPOS(2,2)
TRKPOS(2,2)=TRKPOS(2,1)
TRKPOS(2,1)=TRKTMP
INDT=INDS(2)
INDS(2)=INDS(1)
INDS(1)=INDT
ENDIF
ELSE
IF(TRKPOS(1,1).GT.TRKPOS(1,2)) THEN
TRKTMP=TRKPOS(1,2)
TRKPOS(1,2)=TRKPOS(1,1)
TRKPOS(1,1)=TRKTMP
TRKTMP=TRKPOS(2,2)
TRKPOS(2,2)=TRKPOS(2,1)
TRKPOS(2,1)=TRKTMP
INDT=INDS(2)
INDS(2)=INDS(1)
INDS(1)=INDT
ENDIF
ENDIF
IF(ANGD(2).LT.0.0D0) THEN
IF(TRKPOS(2,2).GT.TRKPOS(2,1)) THEN
TRKTMP=TRKPOS(1,2)
TRKPOS(1,2)=TRKPOS(1,1)
TRKPOS(1,1)=TRKTMP
TRKTMP=TRKPOS(2,2)
TRKPOS(2,2)=TRKPOS(2,1)
TRKPOS(2,1)=TRKTMP
INDT=INDS(2)
INDS(2)=INDS(1)
INDS(1)=INDT
ENDIF
ELSE
IF(TRKPOS(2,1).GT.TRKPOS(2,2)) THEN
TRKTMP=TRKPOS(1,2)
TRKPOS(1,2)=TRKPOS(1,1)
TRKPOS(1,1)=TRKTMP
TRKTMP=TRKPOS(2,2)
TRKPOS(2,2)=TRKPOS(2,1)
TRKPOS(2,1)=TRKTMP
INDT=INDS(2)
INDS(2)=INDS(1)
INDS(1)=INDT
ENDIF
ENDIF
ENDIF
ENDIF
*----
* ROTATE RECTANGLE BY ANGD
*----
IF(LINTER) THEN
DO 110 II=1,2
ROTPOS(1,II)=ANGD(1)*TRKPOS(1,II)+ANGD(2)*TRKPOS(2,II)
ROTPOS(2,II)=-ANGD(2)*TRKPOS(1,II)+ANGD(1)*TRKPOS(2,II)
110 CONTINUE
ENDIF
RETURN
END
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