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occt/src/ShapeUpgrade/ShapeUpgrade_ConvertCurve3dToBezier.cxx

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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_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 against 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
std::cout <<"Warning: The range of the edge exceeds the curve domain" <<std::endl;
#endif
First = bf;
mySplitValues->SetValue(1,First);
}
if(Last > bl){
#ifdef OCCT_DEBUG
std::cout <<"Warning: The range of the edge exceeds the curve domain" <<std::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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