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371 lines
10 KiB
C++
371 lines
10 KiB
C++
// Created on: 1992-01-23
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// Created by: Didier PIFFAULT
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// Copyright (c) 1992-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#include <gp_Dir.hxx>
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#include <TopAbs.hxx>
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#include <TopTrans_CurveTransition.hxx>
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#define GREATER 1
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#define SAME 0
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#define LOWER -1
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//=======================================================================
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//function : TopTrans_CurveTransition
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//purpose : Empty Constructor.
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//=======================================================================
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TopTrans_CurveTransition::TopTrans_CurveTransition ()
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: myCurv(0.0),
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Init(Standard_False),
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CurvFirst(0.0),
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CurvLast(0.0)
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{
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}
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//=======================================================================
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//function : Reset
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//purpose : Initializer for a complex curve transition with the elements
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// of the intersecting curve.
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//=======================================================================
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void TopTrans_CurveTransition::Reset (const gp_Dir& Tgt,
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const gp_Dir& Norm,
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const Standard_Real Curv)
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{
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myTgt=Tgt; myNorm=Norm; myCurv=Curv; Init=Standard_True;
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}
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//=======================================================================
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//function : Reset
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//purpose : Initializer for a complex curve transition with the elements
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// of the intersecting straight line.
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//=======================================================================
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void TopTrans_CurveTransition::Reset (const gp_Dir& Tgt)
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{
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myTgt=Tgt; myCurv=0.; Init=Standard_True;
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}
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//=======================================================================
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//function : Compare
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//purpose : Compare the elements of an interference on an intersected
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// curve with the interference stored in the complex Transition.
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//=======================================================================
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void TopTrans_CurveTransition::Compare (const Standard_Real Tole,
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const gp_Dir& T,
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const gp_Dir& N,
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const Standard_Real C,
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const TopAbs_Orientation St,
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const TopAbs_Orientation Or)
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{
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// S is the transition, how the curve cross the boundary
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// O is the orientation, how the intersection is set on the boundary
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TopAbs_Orientation S = St;
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TopAbs_Orientation O = Or;
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// adjustment for INTERNAL transition
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if (S == TopAbs_INTERNAL) {
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if (T * myTgt < 0)
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S = TopAbs::Reverse(O);
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else
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S = O;
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}
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// It is the first comparison for this complex transition
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if (Init) {
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Init=Standard_False;
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TgtFirst =T;
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NormFirst=N;
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CurvFirst=C;
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TranFirst=S;
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TgtLast =T;
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NormLast =N;
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CurvLast =C;
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TranLast =S;
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switch (O) {
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// Interference en fin d'arete il faut inverser la tangente
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case TopAbs_REVERSED :
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TgtFirst.Reverse();
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TgtLast.Reverse();
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break;
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case TopAbs_INTERNAL :
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// Interference en milieu d'arete il faut inverser en fonction de la
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// position de la tangente de reference
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if (myTgt*T>0) TgtFirst.Reverse();
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else TgtLast.Reverse();
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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}
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// Compare with the existent first and last transition :
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else {
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Standard_Boolean FirstSet=Standard_False;
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Standard_Real cosAngWithT=myTgt*T;
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switch (O) {
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case TopAbs_REVERSED :
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cosAngWithT= -cosAngWithT;
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break;
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case TopAbs_INTERNAL :
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if (cosAngWithT>0) cosAngWithT=-cosAngWithT;
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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Standard_Real cosAngWith1=myTgt*TgtFirst;
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switch (Compare(cosAngWithT, cosAngWith1, Tole)) {
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case LOWER :
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// If the angle is greater than the first the new become the first
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FirstSet=Standard_True;
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TgtFirst =T;
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switch (O) {
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case TopAbs_REVERSED :
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TgtFirst.Reverse();
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break;
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case TopAbs_INTERNAL :
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if (myTgt*T>0) TgtFirst.Reverse();
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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NormFirst=N;
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CurvFirst=C;
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TranFirst=S;
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break;
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case SAME :
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// If same angles we look at the Curvature
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if (IsBefore(Tole, cosAngWithT, N, C, NormFirst, CurvFirst)) {
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FirstSet=Standard_True;
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TgtFirst =T;
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switch (O) {
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case TopAbs_REVERSED :
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TgtFirst.Reverse();
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break;
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case TopAbs_INTERNAL :
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if (myTgt*T>0) TgtFirst.Reverse();
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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NormFirst=N;
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CurvFirst=C;
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TranFirst=S;
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}
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break;
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case GREATER:
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break;
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}
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if (!FirstSet || O==TopAbs_INTERNAL) {
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// Dans les cas de tangence le premier peut etre aussi le dernier
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if (O==TopAbs_INTERNAL) cosAngWithT=-cosAngWithT;
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Standard_Real cosAngWith2=myTgt*TgtLast;
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switch (Compare(cosAngWithT, cosAngWith2, Tole)) {
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case GREATER:
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// If the angle is lower than the last the new become the last
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TgtLast =T;
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switch (O) {
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case TopAbs_REVERSED :
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TgtLast.Reverse();
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break;
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case TopAbs_INTERNAL :
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if (myTgt*T<0) TgtLast.Reverse();
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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NormLast =N;
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CurvLast =C;
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TranLast =S;
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break;
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case SAME:
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// If the angle is the same we look at the curvature
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if (IsBefore(Tole, cosAngWithT, NormLast, CurvLast, N, C)) {
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TgtLast =T;
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switch (O) {
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case TopAbs_REVERSED :
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TgtLast.Reverse();
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break;
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case TopAbs_INTERNAL :
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if (myTgt*T<0) TgtLast.Reverse();
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break;
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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break;
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}
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NormLast=N;
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CurvLast=C;
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TranLast=S;
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}
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}
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}
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}
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}
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//=======================================================================
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//function : StateBefore
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//purpose : Give the state of the curv before the interference.
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//=======================================================================
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TopAbs_State TopTrans_CurveTransition::StateBefore () const
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{
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if (Init) return TopAbs_UNKNOWN;
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switch (TranFirst)
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{
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case TopAbs_FORWARD :
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case TopAbs_EXTERNAL :
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return TopAbs_OUT;
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case TopAbs_REVERSED :
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case TopAbs_INTERNAL :
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return TopAbs_IN;
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}
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return TopAbs_OUT;
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}
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//=======================================================================
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//function : StateAfter
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//purpose : give the state of the curve after the interference.
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//=======================================================================
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TopAbs_State TopTrans_CurveTransition::StateAfter () const
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{
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if (Init) return TopAbs_UNKNOWN;
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switch (TranLast)
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{
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case TopAbs_FORWARD :
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case TopAbs_INTERNAL :
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return TopAbs_IN;
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case TopAbs_REVERSED :
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case TopAbs_EXTERNAL :
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return TopAbs_OUT;
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}
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return TopAbs_OUT;
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}
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//=======================================================================
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//function : IsBefore
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//purpose : Compare the curvature of the two transition and return true
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// if T1 is before T2
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//=======================================================================
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Standard_Boolean TopTrans_CurveTransition::IsBefore
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(const Standard_Real Tole,
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const Standard_Real CosAngl,
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const gp_Dir& N1,
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const Standard_Real C1,
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const gp_Dir& N2,
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const Standard_Real C2) const
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{
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Standard_Real TN1=myTgt*N1;
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Standard_Real TN2=myTgt*N2;
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Standard_Boolean OneBefore=Standard_False;
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if (Abs(TN1)<=Tole || Abs(TN2)<=Tole) {
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// Tangent : The first is the interference which have the nearest curvature
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// from the reference.
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if (myCurv==0) {
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// The reference is straight
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// The first is the interference which have the lowest curvature.
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if (C1<C2) OneBefore=Standard_True;
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// Modified by Sergey KHROMOV - Wed Dec 27 17:08:49 2000 Begin
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if (CosAngl>0)
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OneBefore=!OneBefore;
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// Modified by Sergey KHROMOV - Wed Dec 27 17:08:50 2000 End
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}
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else {
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// The reference is curv
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// The first is the interference which have the nearest curvature
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// in the direction
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Standard_Real deltaC1, deltaC2;
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if (C1==0. || myCurv==0.) {
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deltaC1=C1-myCurv;
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}
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else {
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deltaC1=(C1-myCurv)*(N1*myNorm);
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}
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if (C2==0. || myCurv==0.) {
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deltaC2=C2-myCurv;
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}
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else {
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deltaC2=(C2-myCurv)*(N2*myNorm);
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}
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if (deltaC1 < deltaC2) OneBefore=Standard_True;
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if (CosAngl>0) OneBefore=!OneBefore;
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}
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}
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else if (TN1<0) {
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// Before the first interference we are in the curvature
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if (TN2>0) {
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// Before the second interference we are out the curvature
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// The first interference is before /* ->)( */
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OneBefore=Standard_True;
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}
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else {
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// Before the second interference we are in the curvature
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if (C1>C2) {
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// We choice the greater curvature
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// The first interference is before /* ->)) */
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OneBefore=Standard_True;
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}
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}
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}
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else if (TN1>0) {
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// Before the first interference we are out the curvature
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if (TN2>0) {
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// Before the second interference we are out the curvature /* ->(( */
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if (C1<C2) {
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// We choice the lower curvature
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// The first interference is before
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OneBefore=Standard_True;
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}
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}
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}
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return OneBefore;
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}
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//=======================================================================
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//function : Compare
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//purpose : Compare two angles
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//=======================================================================
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Standard_Integer TopTrans_CurveTransition::Compare(const Standard_Real Ang1,
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const Standard_Real Ang2,
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const Standard_Real Tole) const
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{
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Standard_Integer res=SAME;
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if (Ang1 - Ang2 > Tole) res=GREATER;
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else if (Ang2 - Ang1 > Tole) res=LOWER;
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return res;
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}
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