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occt/src/ShapeUpgrade/ShapeUpgrade_ConvertCurve2dToBezier.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 <Geom2d_BezierCurve.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 <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 against 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
std::cout <<"Warning: The range of the edge exceeds the pcurve 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 pcurve domain" <<std::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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