// Created on: 1991-06-25 // Created by: JCV // Copyright (c) 1991-1999 Matra Datavision // Copyright (c) 1999-2014 OPEN CASCADE SAS // // This file is part of Open CASCADE Technology software library. // // This library is free software; you can redistribute it and/or modify it under // the terms of the GNU Lesser General Public License version 2.1 as published // by the Free Software Foundation, with special exception defined in the file // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT // distribution for complete text of the license and disclaimer of any warranty. // // Alternatively, this file may be used under the terms of Open CASCADE // commercial license or contractual agreement. // Modified 04/10/96 : JCT : derivee des surfaces offset utilisation de // CSLib // Modified 15/11/96 : JPI : ajout equivalent surface pour les surfaces canoniques et modif des methodes D0 D1, ... UIso,VIso // Modified 18/11/96 : JPI : inversion de l'offsetValue dans UReverse et Vreverse #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static const Standard_Real MyAngularToleranceForG1 = Precision::Angular(); //======================================================================= //function : Copy //purpose : //======================================================================= Handle(Geom_Geometry) Geom_OffsetSurface::Copy () const { Handle(Geom_OffsetSurface) S(new Geom_OffsetSurface(basisSurf, offsetValue, Standard_True)); return S; } //======================================================================= //function : Geom_OffsetSurface //purpose : Basis surface cannot be an Offset surface or trimmed from // offset surface. //======================================================================= Geom_OffsetSurface::Geom_OffsetSurface (const Handle(Geom_Surface)& theSurf, const Standard_Real theOffset, const Standard_Boolean isNotCheckC0) : offsetValue (theOffset) { SetBasisSurface(theSurf, isNotCheckC0); } //======================================================================= //function : SetBasisSurface //purpose : //======================================================================= void Geom_OffsetSurface::SetBasisSurface (const Handle(Geom_Surface)& S, const Standard_Boolean isNotCheckC0) { Standard_Real aUf, aUl, aVf, aVl; S->Bounds(aUf, aUl, aVf, aVl); Handle(Geom_Surface) aCheckingSurf = Handle(Geom_Surface)::DownCast(S->Copy()); Standard_Boolean isTrimmed = Standard_False; while(aCheckingSurf->IsKind(STANDARD_TYPE(Geom_RectangularTrimmedSurface)) || aCheckingSurf->IsKind(STANDARD_TYPE(Geom_OffsetSurface))) { if (aCheckingSurf->IsKind(STANDARD_TYPE(Geom_RectangularTrimmedSurface))) { Handle(Geom_RectangularTrimmedSurface) aTrimS = Handle(Geom_RectangularTrimmedSurface)::DownCast(aCheckingSurf); aCheckingSurf = aTrimS->BasisSurface(); isTrimmed = Standard_True; } if (aCheckingSurf->IsKind(STANDARD_TYPE(Geom_OffsetSurface))) { Handle(Geom_OffsetSurface) aOS = Handle(Geom_OffsetSurface)::DownCast(aCheckingSurf); aCheckingSurf = aOS->BasisSurface(); offsetValue += aOS->Offset(); } } myBasisSurfContinuity = aCheckingSurf->Continuity(); Standard_Boolean isC0 = !isNotCheckC0 && (myBasisSurfContinuity == GeomAbs_C0); // Basis surface must be at least C1 if (isC0) { Handle(Geom_Curve) aCurve; if (aCheckingSurf->IsKind(STANDARD_TYPE(Geom_SurfaceOfRevolution))) { Handle(Geom_SurfaceOfRevolution) aRevSurf = Handle(Geom_SurfaceOfRevolution)::DownCast(aCheckingSurf); aCurve = aRevSurf->BasisCurve(); } else if (aCheckingSurf->IsKind(STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion))) { Handle(Geom_SurfaceOfLinearExtrusion) aLESurf = Handle(Geom_SurfaceOfLinearExtrusion)::DownCast(aCheckingSurf); aCurve = aLESurf->BasisCurve(); } if(!aCurve.IsNull()) { while(aCurve->IsKind(STANDARD_TYPE(Geom_TrimmedCurve)) || aCurve->IsKind(STANDARD_TYPE(Geom_OffsetCurve))) { if (aCurve->IsKind(STANDARD_TYPE(Geom_TrimmedCurve))) { Handle(Geom_TrimmedCurve) aTrimC = Handle(Geom_TrimmedCurve)::DownCast(aCurve); aCurve = aTrimC->BasisCurve(); } if (aCurve->IsKind(STANDARD_TYPE(Geom_OffsetCurve))) { Handle(Geom_OffsetCurve) aOC = Handle(Geom_OffsetCurve)::DownCast(aCurve); aCurve = aOC->BasisCurve(); } } } const Standard_Real aUIsoPar = (aUf + aUl)/2.0, aVIsoPar = (aVf + aVl)/2.0; Standard_Boolean isUG1 = Standard_False, isVG1 = Standard_False; const Handle(Geom_Curve) aCurv1 = aCurve.IsNull() ? aCheckingSurf->UIso(aUIsoPar) : aCurve; const Handle(Geom_Curve) aCurv2 = aCheckingSurf->VIso(aVIsoPar); isUG1 = !aCurv1->IsKind(STANDARD_TYPE(Geom_BSplineCurve)); isVG1 = !aCurv2->IsKind(STANDARD_TYPE(Geom_BSplineCurve)); if(!isUG1) { Handle(Geom_BSplineCurve) aBC = Handle(Geom_BSplineCurve)::DownCast(aCurv1); isUG1 = aBC->IsG1(aVf, aVl, MyAngularToleranceForG1); } // if(!isVG1) { Handle(Geom_BSplineCurve) aBC = Handle(Geom_BSplineCurve)::DownCast(aCurv2); isVG1 = aBC->IsG1(aUf, aUl, MyAngularToleranceForG1); } // if(isUG1 && isVG1) { myBasisSurfContinuity = GeomAbs_G1; isC0 = Standard_False; } // Raise exception if still C0 if (isC0) Standard_ConstructionError::Raise("Offset with no C1 Surface"); } if(isTrimmed) { basisSurf = new Geom_RectangularTrimmedSurface(aCheckingSurf, aUf, aUl, aVf, aVl); } else { basisSurf = aCheckingSurf; } equivSurf = Surface(); if (basisSurf->IsKind(STANDARD_TYPE(Geom_BSplineSurface)) || basisSurf->IsKind(STANDARD_TYPE(Geom_BezierSurface))) { // Tolerance en dur pour l'instant ,mais on devrait la proposer dans le constructeur // et la mettre en champ, on pourrait utiliser par exemple pour l'extraction d'iso // et aussi pour les singularite. Pour les surfaces osculatrices, on l'utilise pour // detecter si une iso est degeneree. const Standard_Real Tol = Precision::Confusion(); //0.0001; myOscSurf = new Geom_OsculatingSurface(basisSurf, Tol); } // Surface value calculator if (equivSurf.IsNull()) myEvaluator = new GeomEvaluator_OffsetSurface(basisSurf, offsetValue, myOscSurf); } //======================================================================= //function : SetOffsetValue //purpose : //======================================================================= void Geom_OffsetSurface::SetOffsetValue (const Standard_Real D) { offsetValue = D; equivSurf = Surface(); if (equivSurf.IsNull()) { if (myEvaluator.IsNull()) myEvaluator = new GeomEvaluator_OffsetSurface(basisSurf, offsetValue, myOscSurf); else myEvaluator->SetOffsetValue(offsetValue); } } //======================================================================= //function : UReverse //purpose : //======================================================================= void Geom_OffsetSurface::UReverse () { basisSurf->UReverse(); offsetValue = -offsetValue; if (!equivSurf.IsNull()) equivSurf->UReverse(); else myEvaluator->SetOffsetValue(offsetValue); } //======================================================================= //function : UReversedParameter //purpose : //======================================================================= Standard_Real Geom_OffsetSurface::UReversedParameter(const Standard_Real U) const { return basisSurf->UReversedParameter(U); } //======================================================================= //function : VReverse //purpose : //======================================================================= void Geom_OffsetSurface::VReverse () { basisSurf->VReverse(); offsetValue = -offsetValue; if (!equivSurf.IsNull()) equivSurf->VReverse(); else myEvaluator->SetOffsetValue(offsetValue); } //======================================================================= //function : VReversedParameter //purpose : //======================================================================= Standard_Real Geom_OffsetSurface::VReversedParameter(const Standard_Real V) const { return basisSurf->VReversedParameter(V); } //======================================================================= //function : Bounds //purpose : //======================================================================= void Geom_OffsetSurface::Bounds (Standard_Real& U1, Standard_Real& U2, Standard_Real& V1, Standard_Real& V2) const { basisSurf->Bounds (U1, U2 ,V1, V2); } //======================================================================= //function : Continuity //purpose : //======================================================================= GeomAbs_Shape Geom_OffsetSurface::Continuity () const { switch (myBasisSurfContinuity) { case GeomAbs_C2 : return GeomAbs_C1; case GeomAbs_C3 : return GeomAbs_C2; case GeomAbs_CN : return GeomAbs_CN; default : break; } return GeomAbs_C0; } //======================================================================= //function : D0 //purpose : //======================================================================= void Geom_OffsetSurface::D0 (const Standard_Real U, const Standard_Real V, gp_Pnt& P) const { #ifdef CHECK if (myBasisSurfContinuity == GeomAbs_C0) Geom_UndefinedValue::Raise(); #endif if (equivSurf.IsNull()) myEvaluator->D0(U, V, P); else equivSurf->D0(U,V,P); } //======================================================================= //function : D1 //purpose : //======================================================================= void Geom_OffsetSurface::D1 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V) const { #ifdef CHECK if (myBasisSurfContinuity == GeomAbs_C0 || myBasisSurfContinuity == GeomAbs_C1) Geom_UndefinedDerivative::Raise(); #endif if (equivSurf.IsNull()) myEvaluator->D1(U, V, P, D1U, D1V); else equivSurf->D1(U,V,P,D1U,D1V); } //======================================================================= //function : D2 //purpose : //======================================================================= void Geom_OffsetSurface::D2 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V, gp_Vec& D2U, gp_Vec& D2V, gp_Vec& D2UV) const { #ifdef CHECK if (myBasisSurfContinuity == GeomAbs_C0 || myBasisSurfContinuity == GeomAbs_C1 || myBasisSurfContinuity == GeomAbs_C2) Geom_UndefinedDerivative::Raise(); #endif if (equivSurf.IsNull()) myEvaluator->D2(U, V, P, D1U, D1V, D2U, D2V, D2UV); else equivSurf->D2(U,V,P,D1U,D1V,D2U,D2V,D2UV); } //======================================================================= //function : D3 //purpose : //======================================================================= void Geom_OffsetSurface::D3 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V, gp_Vec& D2U, gp_Vec& D2V, gp_Vec& D2UV, gp_Vec& D3U, gp_Vec& D3V, gp_Vec& D3UUV, gp_Vec& D3UVV) const { #ifdef CHECK if (!(basisSurf->IsCNu (4) && basisSurf->IsCNv (4))) { Geom_UndefinedDerivative::Raise(); } #endif if (equivSurf.IsNull()) myEvaluator->D3(U, V, P, D1U, D1V, D2U, D2V, D2UV, D3U, D3V, D3UUV, D3UVV); else equivSurf->D3(U,V,P,D1U,D1V,D2U,D2V,D2UV,D3U,D3V,D3UUV,D3UVV); } //======================================================================= //function : DN //purpose : //======================================================================= gp_Vec Geom_OffsetSurface::DN (const Standard_Real U, const Standard_Real V, const Standard_Integer Nu, const Standard_Integer Nv) const { Standard_RangeError_Raise_if (Nu < 0 || Nv < 0 || Nu + Nv < 1, " "); #ifdef CHECK if (!(basisSurf->IsCNu (Nu) && basisSurf->IsCNv (Nv))) { Geom_UndefinedDerivative::Raise(); } #endif gp_Vec D(0,0,0); if (equivSurf.IsNull()) D = myEvaluator->DN(U, V, Nu, Nv); else D = equivSurf->DN(U,V,Nu,Nv); return D; } ////************************************************* //// //// EVALUATOR FOR THE ISO-CURVE APPROXIMATION //// ////************************************************* class Geom_OffsetSurface_UIsoEvaluator : public AdvApprox_EvaluatorFunction { public: Geom_OffsetSurface_UIsoEvaluator (const Handle(Geom_Surface)& theSurface, const Standard_Real theU) : CurrentSurface(theSurface), IsoPar(theU) {} virtual void Evaluate (Standard_Integer *Dimension, Standard_Real StartEnd[2], Standard_Real *Parameter, Standard_Integer *DerivativeRequest, Standard_Real *Result, // [Dimension] Standard_Integer *ErrorCode); private: Handle(Geom_Surface) CurrentSurface; Standard_Real IsoPar; }; void Geom_OffsetSurface_UIsoEvaluator::Evaluate(Standard_Integer *,/*Dimension*/ Standard_Real /*StartEnd*/[2], Standard_Real *Parameter, Standard_Integer *DerivativeRequest, Standard_Real *Result, Standard_Integer *ReturnCode) { gp_Pnt P; if (*DerivativeRequest == 0) { P = CurrentSurface->Value(IsoPar,*Parameter); Result[0] = P.X(); Result[1] = P.Y(); Result[2] = P.Z(); } else { gp_Vec DU,DV; CurrentSurface->D1(IsoPar,*Parameter,P,DU,DV); Result[0] = DV.X(); Result[1] = DV.Y(); Result[2] = DV.Z(); } *ReturnCode = 0; } class Geom_OffsetSurface_VIsoEvaluator : public AdvApprox_EvaluatorFunction { public: Geom_OffsetSurface_VIsoEvaluator (const Handle(Geom_Surface)& theSurface, const Standard_Real theV) : CurrentSurface(theSurface), IsoPar(theV) {} virtual void Evaluate (Standard_Integer *Dimension, Standard_Real StartEnd[2], Standard_Real *Parameter, Standard_Integer *DerivativeRequest, Standard_Real *Result, // [Dimension] Standard_Integer *ErrorCode); private: Handle(Geom_Surface) CurrentSurface; Standard_Real IsoPar; }; void Geom_OffsetSurface_VIsoEvaluator::Evaluate(Standard_Integer *,/*Dimension*/ Standard_Real /*StartEnd*/[2], Standard_Real *Parameter, Standard_Integer *DerivativeRequest, Standard_Real *Result, Standard_Integer *ReturnCode) { gp_Pnt P; if (*DerivativeRequest == 0) { P = CurrentSurface->Value(*Parameter,IsoPar); Result[0] = P.X(); Result[1] = P.Y(); Result[2] = P.Z(); } else { gp_Vec DU,DV; CurrentSurface->D1(*Parameter,IsoPar,P,DU,DV); Result[0] = DU.X(); Result[1] = DU.Y(); Result[2] = DU.Z(); } *ReturnCode = 0; } //======================================================================= //function : UIso //purpose : The Uiso or the VIso of an OffsetSurface can't be clearly // exprimed as a curve from Geom. So, to extract the U or VIso // an Approximation is needed. This approx always will return a // BSplineCurve from Geom. //======================================================================= Handle(Geom_Curve) Geom_OffsetSurface::UIso (const Standard_Real UU) const { if (equivSurf.IsNull()) { const Standard_Integer Num1 = 0, Num2 = 0, Num3 = 1; Handle(TColStd_HArray1OfReal) T1, T2, T3 = new TColStd_HArray1OfReal(1,Num3); T3->Init(Precision::Approximation()); Standard_Real U1,U2,V1,V2; Bounds(U1,U2,V1,V2); const GeomAbs_Shape Cont = GeomAbs_C1; const Standard_Integer MaxSeg = 100, MaxDeg = 14; Handle(Geom_OffsetSurface) me (this); Geom_OffsetSurface_UIsoEvaluator ev (me, UU); AdvApprox_ApproxAFunction Approx(Num1, Num2, Num3, T1, T2, T3, V1, V2, Cont, MaxDeg, MaxSeg, ev); Standard_ConstructionError_Raise_if (!Approx.IsDone(), " Geom_OffsetSurface : UIso"); const Standard_Integer NbPoles = Approx.NbPoles(); TColgp_Array1OfPnt Poles( 1, NbPoles); TColStd_Array1OfReal Knots( 1, Approx.NbKnots()); TColStd_Array1OfInteger Mults( 1, Approx.NbKnots()); Approx.Poles(1, Poles); Knots = Approx.Knots()->Array1(); Mults = Approx.Multiplicities()->Array1(); Handle(Geom_BSplineCurve) C = new Geom_BSplineCurve( Poles, Knots, Mults, Approx.Degree()); return C; } else return equivSurf->UIso(UU); } //======================================================================= //function : VIso //purpose : //======================================================================= Handle(Geom_Curve) Geom_OffsetSurface::VIso (const Standard_Real VV) const { if (equivSurf.IsNull()) { const Standard_Integer Num1 = 0, Num2 = 0, Num3 = 1; Handle(TColStd_HArray1OfReal) T1, T2, T3 = new TColStd_HArray1OfReal(1,Num3); T3->Init(Precision::Approximation()); Standard_Real U1,U2,V1,V2; Bounds(U1,U2,V1,V2); const GeomAbs_Shape Cont = GeomAbs_C1; const Standard_Integer MaxSeg = 100, MaxDeg = 14; Handle(Geom_OffsetSurface) me (this); Geom_OffsetSurface_VIsoEvaluator ev (me, VV); AdvApprox_ApproxAFunction Approx (Num1, Num2, Num3, T1, T2, T3, U1, U2, Cont, MaxDeg, MaxSeg, ev); Standard_ConstructionError_Raise_if (!Approx.IsDone(), " Geom_OffsetSurface : VIso"); TColgp_Array1OfPnt Poles( 1, Approx.NbPoles()); TColStd_Array1OfReal Knots( 1, Approx.NbKnots()); TColStd_Array1OfInteger Mults( 1, Approx.NbKnots()); Approx.Poles(1, Poles); Knots = Approx.Knots()->Array1(); Mults = Approx.Multiplicities()->Array1(); Handle(Geom_BSplineCurve) C = new Geom_BSplineCurve( Poles, Knots, Mults, Approx.Degree()); return C; } else return equivSurf->VIso(VV); } //======================================================================= //function : IsCNu //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsCNu (const Standard_Integer N) const { Standard_RangeError_Raise_if (N < 0, " "); return basisSurf->IsCNu (N+1); } //======================================================================= //function : IsCNv //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsCNv (const Standard_Integer N) const { Standard_RangeError_Raise_if (N < 0, " "); return basisSurf->IsCNv (N+1); } //======================================================================= //function : IsUPeriodic //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsUPeriodic () const { return basisSurf->IsUPeriodic(); } //======================================================================= //function : UPeriod //purpose : //======================================================================= Standard_Real Geom_OffsetSurface::UPeriod() const { return basisSurf->UPeriod(); } //======================================================================= //function : IsVPeriodic //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsVPeriodic () const { return basisSurf->IsVPeriodic(); } //======================================================================= //function : VPeriod //purpose : //======================================================================= Standard_Real Geom_OffsetSurface::VPeriod() const { return basisSurf->VPeriod(); } //======================================================================= //function : IsUClosed //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsUClosed () const { Standard_Boolean UClosed; Handle(Geom_Surface) SBasis = BasisSurface(); if (SBasis->IsKind (STANDARD_TYPE(Geom_RectangularTrimmedSurface))) { Handle(Geom_RectangularTrimmedSurface) St = Handle(Geom_RectangularTrimmedSurface)::DownCast(SBasis); Handle(Geom_Surface) S = Handle(Geom_Surface)::DownCast(St->BasisSurface()); if (S->IsKind (STANDARD_TYPE(Geom_ElementarySurface))) { UClosed = SBasis->IsUClosed(); } else if (S->IsKind (STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion))) { Handle(Geom_SurfaceOfLinearExtrusion) Extru = Handle(Geom_SurfaceOfLinearExtrusion)::DownCast(S); Handle(Geom_Curve) C = Extru->BasisCurve(); if (C->IsKind (STANDARD_TYPE(Geom_Circle)) || C->IsKind (STANDARD_TYPE(Geom_Ellipse))) { UClosed = SBasis->IsUClosed(); } else { UClosed = Standard_False; } } else if (S->IsKind (STANDARD_TYPE(Geom_SurfaceOfRevolution))) { UClosed = SBasis->IsUClosed(); } else { UClosed = Standard_False; } } else { if (SBasis->IsKind (STANDARD_TYPE(Geom_ElementarySurface))) { UClosed = SBasis->IsUClosed(); } else if (SBasis->IsKind (STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion))) { Handle(Geom_SurfaceOfLinearExtrusion) Extru = Handle(Geom_SurfaceOfLinearExtrusion)::DownCast(SBasis); Handle(Geom_Curve) C = Extru->BasisCurve(); UClosed = (C->IsKind(STANDARD_TYPE(Geom_Circle)) || C->IsKind(STANDARD_TYPE(Geom_Ellipse))); } else if (SBasis->IsKind (STANDARD_TYPE(Geom_SurfaceOfRevolution))) { UClosed = Standard_True; } else { UClosed = Standard_False; } } return UClosed; } //======================================================================= //function : IsVClosed //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::IsVClosed () const { Standard_Boolean VClosed; Handle(Geom_Surface) SBasis = BasisSurface(); if (SBasis->IsKind (STANDARD_TYPE(Geom_RectangularTrimmedSurface))) { Handle(Geom_RectangularTrimmedSurface) St = Handle(Geom_RectangularTrimmedSurface)::DownCast(SBasis); Handle(Geom_Surface) S = Handle(Geom_Surface)::DownCast(St->BasisSurface()); if (S->IsKind (STANDARD_TYPE(Geom_ElementarySurface))) { VClosed = SBasis->IsVClosed(); } else { VClosed = Standard_False; } } else { if (SBasis->IsKind (STANDARD_TYPE(Geom_ElementarySurface))) { VClosed = SBasis->IsVClosed(); } else { VClosed = Standard_False; } } return VClosed; } //======================================================================= //function : Transform //purpose : //======================================================================= void Geom_OffsetSurface::Transform (const gp_Trsf& T) { basisSurf->Transform (T); offsetValue *= T.ScaleFactor(); equivSurf.Nullify(); if (myEvaluator.IsNull()) myEvaluator = new GeomEvaluator_OffsetSurface(basisSurf, offsetValue, myOscSurf); else myEvaluator->SetOffsetValue(offsetValue); } //======================================================================= //function : TransformParameters //purpose : //======================================================================= void Geom_OffsetSurface::TransformParameters(Standard_Real& U, Standard_Real& V, const gp_Trsf& T) const { basisSurf->TransformParameters(U,V,T); if(!equivSurf.IsNull()) equivSurf->TransformParameters(U,V,T); } //======================================================================= //function : ParametricTransformation //purpose : //======================================================================= gp_GTrsf2d Geom_OffsetSurface::ParametricTransformation (const gp_Trsf& T) const { return basisSurf->ParametricTransformation(T); } //======================================================================= //function : Surface //purpose : Trouve si elle existe, une surface non offset, equivalente // a l'offset surface. //======================================================================= Handle(Geom_Surface) Geom_OffsetSurface::Surface() const { if (offsetValue == 0.0) return basisSurf; // Cas direct Standard_Real Tol = Precision::Confusion(); Handle(Geom_Surface) Result, Base; Result.Nullify(); Handle(Standard_Type) TheType = basisSurf->DynamicType(); Standard_Boolean IsTrimmed; Standard_Real U1 = 0., V1 = 0., U2 = 0., V2 = 0.; // Preambule pour les surface trimmes if (TheType == STANDARD_TYPE(Geom_RectangularTrimmedSurface)) { Handle(Geom_RectangularTrimmedSurface) S = Handle(Geom_RectangularTrimmedSurface)::DownCast(basisSurf); Base = S->BasisSurface(); TheType = Base->DynamicType(); S->Bounds(U1,U2,V1,V2); IsTrimmed = Standard_True; } else { IsTrimmed = Standard_False; Base = basisSurf; } // Traite les surfaces cannonique if (TheType == STANDARD_TYPE(Geom_Plane)) { Handle(Geom_Plane) P = Handle(Geom_Plane)::DownCast(Base); gp_Vec T = P->Position().XDirection()^P->Position().YDirection(); T *= offsetValue; Result = Handle(Geom_Plane)::DownCast(P->Translated(T)); } else if (TheType == STANDARD_TYPE(Geom_CylindricalSurface)) { Handle(Geom_CylindricalSurface) C = Handle(Geom_CylindricalSurface)::DownCast(Base); Standard_Real Radius = C->Radius(); gp_Ax3 Axis = C->Position(); if (Axis.Direct()) Radius += offsetValue; else Radius -= offsetValue; if ( Radius >= Tol ) { Result = new Geom_CylindricalSurface( Axis, Radius); } else if ( Radius <= -Tol ){ Axis.Rotate(gp_Ax1(Axis.Location(),Axis.Direction()),M_PI); Result = new Geom_CylindricalSurface( Axis, Abs(Radius)); Result->UReverse(); } else { // surface degeneree } } else if (TheType == STANDARD_TYPE(Geom_ConicalSurface)) { Handle(Geom_ConicalSurface) C = Handle(Geom_ConicalSurface)::DownCast(Base); gp_Ax3 anAxis = C->Position(); Standard_Boolean isDirect = anAxis.Direct(); Standard_Real anAlpha = C->SemiAngle(); Standard_Real aRadius; if (isDirect) { aRadius = C->RefRadius() + offsetValue * Cos (anAlpha); } else { aRadius = C->RefRadius() - offsetValue * Cos (anAlpha); } if (aRadius >= 0.) { gp_Vec aZ (anAxis.Direction()); if (isDirect) { aZ *= -offsetValue * Sin (anAlpha); } else { aZ *= offsetValue * Sin (anAlpha); } anAxis.Translate (aZ); Result = new Geom_ConicalSurface (anAxis, anAlpha, aRadius); } else { // surface degeneree } } else if (TheType == STANDARD_TYPE(Geom_SphericalSurface)) { Handle(Geom_SphericalSurface) S = Handle(Geom_SphericalSurface)::DownCast(Base); Standard_Real Radius = S->Radius(); gp_Ax3 Axis = S->Position(); if (Axis.Direct()) Radius += offsetValue; else Radius -= offsetValue; if ( Radius >= Tol) { Result = new Geom_SphericalSurface(Axis, Radius); } else if ( Radius <= -Tol ) { Axis.Rotate(gp_Ax1(Axis.Location(),Axis.Direction()),M_PI); Axis.ZReverse(); Result = new Geom_SphericalSurface(Axis, -Radius); Result->UReverse(); } else { // surface degeneree } } else if (TheType == STANDARD_TYPE(Geom_ToroidalSurface)) { Handle(Geom_ToroidalSurface) S = Handle(Geom_ToroidalSurface)::DownCast(Base); Standard_Real MajorRadius = S->MajorRadius(); Standard_Real MinorRadius = S->MinorRadius(); gp_Ax3 Axis = S->Position(); if (MinorRadius <= MajorRadius) { if (Axis.Direct()) MinorRadius += offsetValue; else MinorRadius -= offsetValue; if (MinorRadius >= Tol) Result = new Geom_ToroidalSurface(Axis,MajorRadius,MinorRadius); // else if (MinorRadius <= -Tol) // Result->UReverse(); else { // surface degeneree } } } // S'il le faut on trimme le resultat if (IsTrimmed && !Result.IsNull()) { Base = Result; Result = new Geom_RectangularTrimmedSurface (Base, U1, U2, V1,V2); } return Result; } //======================================================================= //function : UOsculatingSurface //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::UOsculatingSurface(const Standard_Real U, const Standard_Real V, Standard_Boolean& t, Handle(Geom_BSplineSurface)& L) const { return !myOscSurf.IsNull() && myOscSurf->UOscSurf(U,V,t,L); } //======================================================================= //function : VOsculatingSurface //purpose : //======================================================================= Standard_Boolean Geom_OffsetSurface::VOsculatingSurface(const Standard_Real U, const Standard_Real V, Standard_Boolean& t, Handle(Geom_BSplineSurface)& L) const { return !myOscSurf.IsNull() && myOscSurf->VOscSurf(U, V, t, L); }