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occt/src/ShapeUpgrade/ShapeUpgrade_ConvertCurve2dToBezier.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 <Geom2d_BezierCurve.hxx>
#include <Geom2d_BSplineCurve.hxx>
#include <Geom2d_Conic.hxx>
#include <Geom2d_Line.hxx>
#include <Geom2d_TrimmedCurve.hxx>
#include <Geom2dConvert.hxx>
#include <Geom2dConvert_ApproxCurve.hxx>
#include <Geom2dConvert_BSplineCurveToBezierCurve.hxx>
#include <Geom_Curve.hxx>
#include <GeomTools.hxx>
#include <Precision.hxx>
#include <ShapeCustom_Curve2d.hxx>
#include <ShapeExtend.hxx>
#include <ShapeUpgrade_ConvertCurve2dToBezier.hxx>
#include <Standard_Type.hxx>
#include <TColGeom2d_HArray1OfCurve.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <TColStd_Array1OfReal.hxx>
IMPLEMENT_STANDARD_RTTIEXT(ShapeUpgrade_ConvertCurve2dToBezier,ShapeUpgrade_SplitCurve2d)
ShapeUpgrade_ConvertCurve2dToBezier::ShapeUpgrade_ConvertCurve2dToBezier()
{
mySegments = new TColGeom2d_HSequenceOfCurve;
mySplitParams = new TColStd_HSequenceOfReal;
}
static Handle(Geom2d_BezierCurve) MakeBezier2d(const Handle(Geom2d_Curve)& theCurve2d,
const Standard_Real theFirst,
const Standard_Real theLast)
{
TColgp_Array1OfPnt2d poles(1,2);
poles(1) = theCurve2d->Value(theFirst);
poles(2) = theCurve2d->Value(theLast);
Handle(Geom2d_BezierCurve) bezier = new Geom2d_BezierCurve(poles);
return bezier;
}
//=======================================================================
//function : Compute
//purpose :
//=======================================================================
void ShapeUpgrade_ConvertCurve2dToBezier::Compute()
{
mySegments->Clear();
mySplitParams->Clear();
Standard_Real precision = Precision::PConfusion();
Standard_Real First = mySplitValues->Value(1);
Standard_Real Last = mySplitValues->Value(mySplitValues->Length());
// PTV Try to create line2d from myCurve
if ( myCurve->IsKind(STANDARD_TYPE(Geom2d_BSplineCurve)) ||
myCurve->IsKind(STANDARD_TYPE(Geom2d_BezierCurve)) )
{
// static function`s code getted from ShapeConvert
Standard_Real tmpF, tmpL, aDeviation;
Handle(Geom2d_Line) aTmpLine2d =
ShapeCustom_Curve2d::ConvertToLine2d(myCurve, First, Last, Precision::Approximation(),
tmpF, tmpL, aDeviation);
if (!aTmpLine2d.IsNull() && (aDeviation <= Precision::Approximation()) )
{
Handle(Geom2d_BezierCurve) bezier = MakeBezier2d(aTmpLine2d, tmpF, tmpL);
mySegments->Append(bezier);
mySplitParams->Append(First);
mySplitParams->Append(Last);
myNbCurves = mySplitValues->Length()-1;
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
return;
}
}
if(myCurve->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))) {
Handle(Geom2d_TrimmedCurve) tmp = Handle(Geom2d_TrimmedCurve)::DownCast (myCurve);
Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve();
ShapeUpgrade_ConvertCurve2dToBezier converter;
//converter.Init(BasCurve,Max(First,BasCurve->FirstParameter()),Min(Last,BasCurve->LastParameter())); //???
converter.Init(BasCurve,First,Last);
converter.SetSplitValues(mySplitValues);
converter.Compute();
mySplitValues->Clear();
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(Geom2d_BezierCurve))) {
Handle(Geom2d_BezierCurve) bezier = Handle(Geom2d_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(Geom2d_BezierCurve) besNew = Handle(Geom2d_BezierCurve)::DownCast(bezier->Copy());
besNew->Segment(First,Last);
mySegments->Append(besNew);
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
}
return;
}
else if(myCurve->IsKind(STANDARD_TYPE(Geom2d_Line))) {
Handle(Geom2d_Line) aLine2d = Handle(Geom2d_Line)::DownCast(myCurve);
Handle(Geom2d_BezierCurve) bezier = MakeBezier2d(aLine2d, First, Last);
mySegments->Append(bezier);
mySplitParams->Append(First);
mySplitParams->Append(Last);
myNbCurves = mySplitValues->Length()-1;
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
return;
}
else {
Handle(Geom2d_BSplineCurve) aBSpline2d;
Standard_Real Shift = 0.;
if(myCurve->IsKind(STANDARD_TYPE(Geom2d_Conic))) {
Handle(Geom2d_Curve) tcurve = new Geom2d_TrimmedCurve(myCurve,First,Last); //protection agains parabols ets
Geom2dConvert_ApproxCurve approx (tcurve, Precision::Approximation(),
GeomAbs_C1, 100, 6 );
if ( approx.HasResult() )
aBSpline2d = approx.Curve();
else
aBSpline2d = Geom2dConvert::CurveToBSplineCurve(tcurve,Convert_QuasiAngular);
Shift = First - aBSpline2d->FirstParameter();
First = aBSpline2d->FirstParameter();
Last = aBSpline2d->LastParameter();
}
else if(!myCurve->IsKind(STANDARD_TYPE(Geom2d_BSplineCurve))) {
aBSpline2d = Geom2dConvert::CurveToBSplineCurve(myCurve,Convert_QuasiAngular);
}
else
aBSpline2d = Handle(Geom2d_BSplineCurve)::DownCast(myCurve);
Standard_Real bf = aBSpline2d->FirstParameter();
Standard_Real bl = aBSpline2d->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 pcurve domain" <<endl;
#endif
First = bf;
mySplitValues->SetValue(1,First);
}
if(Last > bl){
#ifdef OCCT_DEBUG
cout <<"Warning: The range of the edge exceeds the pcurve domain" <<endl;
#endif
Last = bl;
mySplitValues->SetValue(mySplitValues->Length(),Last);
}
// PTV 20.12.2001 Try to simpify BSpline Curve
ShapeCustom_Curve2d::SimplifyBSpline2d (aBSpline2d, Precision::Approximation());
Geom2dConvert_BSplineCurveToBezierCurve tool(aBSpline2d,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
Standard_Real newFirst = First+Shift;
Standard_Real newLast = First+Shift;
for(j = 1; j <=nbArcs; j++) {
Standard_Real nextKnot = knots(j+1)+Shift;
if(nextKnot - mySplitParams->Value(mySplitParams->Length()) > precision) {
Handle(Geom2d_Curve) aCrv2d = tool.Arc(j);
if ( aCrv2d->IsKind(STANDARD_TYPE(Geom2d_BezierCurve)) )
{
newFirst = newLast;
newLast = nextKnot;
Standard_Real tmpF, tmpL, aDeviation;
Handle(Geom2d_Line) aTmpLine2d =
ShapeCustom_Curve2d::ConvertToLine2d(aCrv2d, newFirst, newLast, Precision::Approximation(),
tmpF, tmpL, aDeviation);
if (!aTmpLine2d.IsNull() && (aDeviation <= Precision::Approximation()) )
{
Handle(Geom2d_BezierCurve) bezier = MakeBezier2d(aBSpline2d, newFirst, newLast);
mySegments->Append(bezier);
mySplitParams->Append(newLast);
continue;
}
}
mySegments->Append(aCrv2d);
mySplitParams->Append(nextKnot);
}
}
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_ConvertCurve2dToBezier::Build(const Standard_Boolean /*Segment*/)
{
Standard_Real prec = Precision::PConfusion();
Standard_Integer nb = mySplitValues->Length();
myResultingCurves = new TColGeom2d_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(Geom2d_BezierCurve) bes = Handle(Geom2d_BezierCurve)
::DownCast(mySegments->Value(j-1)->Copy());
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);
}
}
//=======================================================================
//function : Segments
//purpose :
//=======================================================================
Handle(TColGeom2d_HSequenceOfCurve) ShapeUpgrade_ConvertCurve2dToBezier::Segments() const
{
return mySegments;
}
//=======================================================================
//function : SplitParams
//purpose :
//=======================================================================
Handle(TColStd_HSequenceOfReal) ShapeUpgrade_ConvertCurve2dToBezier::SplitParams() const
{
return mySplitParams;
}
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