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// File: GeomLib_Check2dBSplineCurve.cxx
// Created: Wed May 28 17:26:47 1997
// Author: Xavier BENVENISTE
// <xab@zozox.paris1.matra-dtv.fr>
#include <GeomLib_Check2dBSplineCurve.ixx>
#include <Geom_BSplineCurve.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Vec2d.hxx>
//=======================================================================
//function : GeomLib_Check2dBSplineCurve
//purpose :
//=======================================================================
GeomLib_Check2dBSplineCurve::GeomLib_Check2dBSplineCurve(const Handle(Geom2d_BSplineCurve)& Curve,
const Standard_Real Tolerance,
const Standard_Real AngularTolerance)
:myCurve(Curve),
myDone(Standard_False),
myFixFirstTangent(Standard_False),
myFixLastTangent(Standard_False),
myAngularTolerance(Abs(AngularTolerance)),
myTolerance(Abs(Tolerance)),
myFirstPole(1.0,0.0e0),
myLastPole(1.0e0,0.0e0)
{
Standard_Integer ii,
num_poles ;
Standard_Real tangent_magnitude,
value,
angular_value,
factor,
vector_magnitude ;
num_poles = Curve->NbPoles() ;
if (( ! myCurve->IsPeriodic() )&& num_poles >= 4) {
gp_Vec2d tangent,
diff,
a_vector;
for (ii = 1 ; ii <= 2 ; ii++) {
tangent.SetCoord(ii,myCurve->Pole(2).Coord(ii) - myCurve->Pole(1).Coord(ii)) ;
a_vector.SetCoord(ii, myCurve->Pole(3).Coord(ii) - myCurve->Pole(1).Coord(ii)) ;
}
tangent_magnitude = tangent.Magnitude() ;
vector_magnitude = a_vector.Magnitude() ;
if (tangent_magnitude > myTolerance &&
vector_magnitude > myTolerance)
{
value = tangent.Dot(a_vector) ;
if ( value < 0.0e0) {
for (ii = 1 ; ii <= 2 ; ii++) {
diff.SetCoord(ii, (tangent.Coord(ii) / tangent_magnitude) + (a_vector.Coord(ii) / vector_magnitude)) ;
}
angular_value =
diff.Magnitude() ;
if (angular_value < myAngularTolerance) {
myFixFirstTangent = Standard_True ;
factor = 1.0e0 ;
if (tangent_magnitude > 0.5e0 * vector_magnitude) {
factor = 0.5e0 * vector_magnitude / tangent_magnitude ;
}
for (ii = 1 ; ii <= 2 ; ii++) {
myFirstPole.SetCoord(ii, myCurve->Pole(1).Coord(ii) - factor * tangent.Coord(ii)) ;
}
}
}
}
for (ii = 1 ; ii <= 2 ; ii++) {
tangent.SetCoord(ii,myCurve->Pole(num_poles-1).Coord(ii) - myCurve->Pole(num_poles).Coord(ii)) ;
a_vector.SetCoord(ii, myCurve->Pole(num_poles-2).Coord(ii) - myCurve->Pole(num_poles).Coord(ii)) ;
}
tangent_magnitude = tangent.Magnitude() ;
vector_magnitude = a_vector.Magnitude() ;
if (tangent_magnitude > myTolerance &&
vector_magnitude > myTolerance)
{
value = tangent.Dot(a_vector) ;
if (value < 0.0e0) {
for (ii = 1 ; ii <= 2 ; ii++) {
diff.SetCoord(ii, (tangent.Coord(ii) / tangent_magnitude) + (a_vector.Coord(ii) / vector_magnitude)) ;
}
angular_value =
diff.Magnitude() ;
if ( angular_value < myAngularTolerance) {
myFixLastTangent = Standard_True ;
factor = 1.0e0 ;
if (tangent_magnitude > 0.5e0 * vector_magnitude) {
factor = 0.5e0 * vector_magnitude / tangent_magnitude ;
}
for (ii = 1 ; ii <= 2 ; ii++) {
myLastPole.SetCoord(ii, myCurve->Pole(num_poles).Coord(ii) - factor * tangent.Coord(ii)) ;
}
}
}
}
}
else {
myDone = Standard_True ;
}
}
//=======================================================================
//function : NeedTangentFix
//purpose :
//=======================================================================
void GeomLib_Check2dBSplineCurve::NeedTangentFix(Standard_Boolean & FirstFlag,
Standard_Boolean & LastFlag) const
{
FirstFlag = myFixFirstTangent ;
LastFlag = myFixLastTangent ;
}
//=======================================================================
//function : FixTangent
//purpose :
//=======================================================================
Handle(Geom2d_BSplineCurve) GeomLib_Check2dBSplineCurve::FixedTangent(const Standard_Boolean FirstFlag,
const Standard_Boolean LastFlag)
{
Handle(Geom2d_BSplineCurve) new_curve ;
if ((myFixFirstTangent && FirstFlag) ||(myFixLastTangent && LastFlag)) {
new_curve =
Handle(Geom2d_BSplineCurve)::DownCast(myCurve->Copy()) ;
}
if (myFixFirstTangent && FirstFlag) {
new_curve->SetPole(2,
myFirstPole) ;
}
if (myFixLastTangent && LastFlag) {
Standard_Integer num_poles = myCurve->NbPoles() ;
new_curve->SetPole(num_poles-1,
myLastPole) ;
}
myDone = Standard_True ;
return new_curve ;
}
//=======================================================================
//function : FixTangent
//purpose :
//=======================================================================
void GeomLib_Check2dBSplineCurve::FixTangent(const Standard_Boolean FirstFlag,
const Standard_Boolean LastFlag)
{
if (myFixFirstTangent && FirstFlag) {
myCurve->SetPole(2,
myFirstPole) ;
}
if (myFixLastTangent && LastFlag) {
Standard_Integer num_poles = myCurve->NbPoles() ;
myCurve->SetPole(num_poles-1,
myLastPole) ;
}
myDone = Standard_True ;
}
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