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occt/src/ShapeUpgrade/ShapeUpgrade_ConvertCurve3dToBezier.cxx
abv a9dde4a31b 0027104: DownCast() cannot return null for mismatched handle 
Method DownCast() is made template, to be available only when argument is actually a pointer or handle to a base class.

For compatibility with existing code, method DownCast() that can be used for the same type, derived, or unrelated class (i.e. where there is no actual down casting) is still available, its use shall cause "deprecated" compiler warning.

OCCT code is updated to remove meaningless DownCast()s; a few places where DownCast() was used with argument of unrelated type are corrected.

DRAW command QAHandleCast is removed (it was useful only during redesign of handles).
2016-02-20 10:10:15 +03:00

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// Created on: 1999-05-13
// Created by: data exchange team
// Copyright (c) 1999-1999 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.
#include <Geom_BezierCurve.hxx>
#include <Geom_BSplineCurve.hxx>
#include <Geom_Circle.hxx>
#include <Geom_Conic.hxx>
#include <Geom_Curve.hxx>
#include <Geom_Line.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <GeomConvert.hxx>
#include <GeomConvert_ApproxCurve.hxx>
#include <GeomConvert_BSplineCurveToBezierCurve.hxx>
#include <Precision.hxx>
#include <ShapeExtend.hxx>
#include <ShapeUpgrade_ConvertCurve3dToBezier.hxx>
#include <Standard_Type.hxx>
#include <TColGeom_HArray1OfCurve.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <TColStd_Array1OfReal.hxx>
IMPLEMENT_STANDARD_RTTIEXT(ShapeUpgrade_ConvertCurve3dToBezier,ShapeUpgrade_SplitCurve3d)
ShapeUpgrade_ConvertCurve3dToBezier::ShapeUpgrade_ConvertCurve3dToBezier()
{
mySegments = new TColGeom_HSequenceOfCurve;
mySplitParams = new TColStd_HSequenceOfReal;
myLineMode = Standard_True;
myCircleMode = Standard_True;
myConicMode = Standard_True;
}
//=======================================================================
//function : Compute
//purpose :
//=======================================================================
void ShapeUpgrade_ConvertCurve3dToBezier::Compute()
{
mySegments->Clear();
mySplitParams->Clear();
Standard_Real precision = Precision::PConfusion();
Standard_Real First = mySplitValues->Value(1);
Standard_Real Last = mySplitValues->Value(mySplitValues->Length());
if(myCurve->IsKind(STANDARD_TYPE(Geom_TrimmedCurve))) {
Handle(Geom_TrimmedCurve) tmp = Handle(Geom_TrimmedCurve)::DownCast (myCurve);
Handle(Geom_Curve) BasCurve = tmp->BasisCurve();
ShapeUpgrade_ConvertCurve3dToBezier converter;
converter.Init(BasCurve,First,Last);
converter.SetSplitValues(mySplitValues);
converter.Compute();
mySplitValues->ChangeSequence() = converter.SplitValues()->Sequence();
myNbCurves = mySplitValues->Length()-1;
myStatus |= converter.myStatus;
mySegments->ChangeSequence() = converter.Segments()->Sequence();
mySplitParams->ChangeSequence() = converter.SplitParams()->Sequence();
return;
}
else if(myCurve->IsKind(STANDARD_TYPE(Geom_BezierCurve))) {
Handle(Geom_BezierCurve) bezier = Handle(Geom_BezierCurve)::DownCast (myCurve);
myNbCurves = mySplitValues->Length()-1;
mySplitParams->Append(First);
mySplitParams->Append(Last);
if(First < precision && Last > 1 - precision) {
mySegments->Append(bezier);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_OK);
} else {
Handle(Geom_BezierCurve) besNew = Handle(Geom_BezierCurve)::DownCast(bezier->Copy());
besNew->Segment(First,Last);
mySegments->Append(besNew);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
}
return;
}
else if(myCurve->IsKind(STANDARD_TYPE(Geom_Line))) {
Handle(Geom_Line) aLine = Handle(Geom_Line)::DownCast(myCurve);
myNbCurves = mySplitValues->Length()-1;
mySplitParams->Append(First);
mySplitParams->Append(Last);
if(!myLineMode) {
mySegments->Append(aLine);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_OK);
return;
}
TColgp_Array1OfPnt poles(1,2);
poles(1) = aLine->Value(First);
poles(2) = aLine->Value(Last);
Handle(Geom_BezierCurve) bezier = new Geom_BezierCurve(poles);
mySegments->Append(bezier);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
return;
}
else if((myCurve->IsKind(STANDARD_TYPE(Geom_Conic))&&!myConicMode)||
(myCurve->IsKind(STANDARD_TYPE(Geom_Circle))&&!myCircleMode)) {
myNbCurves = mySplitValues->Length()-1;
mySplitParams->Append(First);
mySplitParams->Append(Last);
mySegments->Append(myCurve);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_OK);
return;
}
else {
Handle(Geom_BSplineCurve) aBSpline;
Standard_Real Shift = 0.;
if(myCurve->IsKind(STANDARD_TYPE(Geom_Conic))) {
Handle(Geom_Curve) tcurve = new Geom_TrimmedCurve(myCurve,First,Last); //protection agains parabols ets
GeomConvert_ApproxCurve approx (tcurve, Precision::Approximation(),
GeomAbs_C1, 100, 6 );
if ( approx.HasResult() )
aBSpline = approx.Curve();
else {
Handle(Geom_TrimmedCurve) t3d = new Geom_TrimmedCurve(myCurve,First,Last);
aBSpline = GeomConvert::CurveToBSplineCurve(t3d,Convert_QuasiAngular);
}
Shift = First - aBSpline->FirstParameter();
First = aBSpline->FirstParameter();
Last = aBSpline->LastParameter();
}
else if(!myCurve->IsKind(STANDARD_TYPE(Geom_BSplineCurve))) {
aBSpline = GeomConvert::CurveToBSplineCurve(myCurve,Convert_QuasiAngular);
}
else
aBSpline = Handle(Geom_BSplineCurve)::DownCast(myCurve);
Standard_Real bf = aBSpline->FirstParameter();
Standard_Real bl = aBSpline->LastParameter();
if(Abs(First-bf) < precision)
First = bf;
if(Abs(Last-bl) < precision)
Last = bl;
if(First < bf){
#ifdef OCCT_DEBUG
cout <<"Warning: The range of the edge exceeds the curve domain" <<endl;
#endif
First = bf;
mySplitValues->SetValue(1,First);
}
if(Last > bl){
#ifdef OCCT_DEBUG
cout <<"Warning: The range of the edge exceeds the curve domain" <<endl;
#endif
Last = bl;
mySplitValues->SetValue(mySplitValues->Length(),Last);
}
GeomConvert_BSplineCurveToBezierCurve tool(aBSpline,First,Last,precision);
Standard_Integer nbArcs = tool.NbArcs();
TColStd_Array1OfReal knots(1,nbArcs+1);
tool.Knots(knots);
mySplitParams->Append(First+Shift);
Standard_Integer j; // svv Jan 10 2000 : porting on DEC
for(j = 1; j <=nbArcs; j++) {
Standard_Real nextKnot = knots(j+1)+Shift;
if(nextKnot - mySplitParams->Value(mySplitParams->Length()) > precision) {
mySegments->Append(tool.Arc(j));
mySplitParams->Append(knots(j+1)+Shift);
}
}
First = mySplitValues->Value(1);
for(j = 2; j <= mySplitValues->Length(); j++) {
Last = mySplitValues->Value(j);
for(Standard_Integer i = 2; i <= nbArcs+1; i++) {
Standard_Real valknot = knots(i)+Shift;
if(valknot <= First + precision) continue;
if(valknot >= Last - precision) break;
mySplitValues->InsertBefore(j++,valknot);
}
First = Last;
}
myNbCurves = mySplitValues->Length()-1;
}
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
}
//=======================================================================
//function : Build
//purpose :
//=======================================================================
void ShapeUpgrade_ConvertCurve3dToBezier::Build(const Standard_Boolean /*Segment*/)
{
Standard_Real prec = Precision::PConfusion();
Standard_Integer nb = mySplitValues->Length();
myResultingCurves = new TColGeom_HArray1OfCurve (1,nb-1);
Standard_Real prevPar = 0.;
Standard_Integer j=2;
for(Standard_Integer i = 2; i <= nb; i++) {
Standard_Real par = mySplitValues->Value(i);
for(; j<= mySplitParams->Length(); j++)
if(mySplitParams->Value(j)+prec > par)
break;
else
prevPar = 0.;
Handle(Geom_Curve) crv = Handle(Geom_Curve)::DownCast(mySegments->Value(j-1)->Copy());
if(crv->IsKind(STANDARD_TYPE(Geom_BezierCurve))) {
Handle(Geom_BezierCurve) bes = Handle(Geom_BezierCurve)::DownCast(crv);
Standard_Real uFact = mySplitParams->Value(j) - mySplitParams->Value(j-1);
Standard_Real pp = mySplitValues->Value(i-1);
Standard_Real length = (par - pp)/uFact;
bes->Segment(prevPar, prevPar+length);
prevPar += length;
myResultingCurves->SetValue(i-1,bes);
}
else
myResultingCurves->SetValue(i-1,crv);
}
}
//=======================================================================
//function : Segments
//purpose :
//=======================================================================
Handle(TColGeom_HSequenceOfCurve) ShapeUpgrade_ConvertCurve3dToBezier::Segments() const
{
return mySegments;
}
//=======================================================================
//function : SplitParams
//purpose :
//=======================================================================
Handle(TColStd_HSequenceOfReal) ShapeUpgrade_ConvertCurve3dToBezier::SplitParams() const
{
return mySplitParams;
}
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