src/Mod/Part/App/Geom2d/Curve2dPyImp.cpp

// SPDX-License-Identifier: LGPL-2.1-or-later

/***************************************************************************
 *   Copyright (c) 2016 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#include <sstream>

#include <BRepAdaptor_Curve.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_MakeEdge2d.hxx>
#include <BRep_Builder.hxx>
#include <BRep_Tool.hxx>
#include <BRepLib.hxx>
#include <GCPnts_UniformAbscissa.hxx>
#include <GCPnts_UniformDeflection.hxx>
#include <GCPnts_TangentialDeflection.hxx>
#include <GCPnts_QuasiUniformAbscissa.hxx>
#include <GCPnts_QuasiUniformDeflection.hxx>
#include <GCPnts_AbscissaPoint.hxx>
#include <Geom2d_Curve.hxx>
#include <Geom2d_Geometry.hxx>
#include <Geom2dAdaptor_Curve.hxx>
#include <Geom2dAPI_ExtremaCurveCurve.hxx>
#include <Geom2dAPI_InterCurveCurve.hxx>
#include <Geom2dAPI_ProjectPointOnCurve.hxx>
#include <Geom2dConvert_ApproxCurve.hxx>
#include <Geom2dLProp_CLProps2d.hxx>
#include <gp_Dir2d.hxx>
#include <Precision.hxx>
#include <ShapeConstruct_Curve.hxx>
#include <Standard_Failure.hxx>
#include <Standard_NullValue.hxx>
#include <TopoDS.hxx>

#include <Base/GeometryPyCXX.h>
#include <Base/PyWrapParseTupleAndKeywords.h>

#include "Geom2d/Curve2dPy.h"
#include "Geom2d/Curve2dPy.cpp"
#include "Geom2d/BSplineCurve2dPy.h"
#include "GeometrySurfacePy.h"
#include "OCCError.h"
#include "TopoShapeFacePy.h"


namespace Part
{
extern const Py::Object makeGeometryCurvePy(const Handle(Geom_Curve) & c);
}

using namespace Part;

// returns a string which represents the object e.g. when printed in python
std::string Curve2dPy::representation() const
{
    return "<Curve2d object>";
}

PyObject* Curve2dPy::PyMake(struct _typeobject*, PyObject*, PyObject*)  // Python wrapper
{
    // never create such objects with the constructor
    PyErr_SetString(PyExc_RuntimeError, "You cannot create an instance of the abstract class 'Curve2d'.");
    return nullptr;
}

// constructor method
int Curve2dPy::PyInit(PyObject* /*args*/, PyObject* /*kwd*/)
{
    return 0;
}

PyObject* Curve2dPy::reverse(PyObject* args)
{
    if (PyArg_ParseTuple(args, "")) {
        try {
            Handle(Geom2d_Curve) curve = Handle(Geom2d_Curve)::DownCast(getGeom2dCurvePtr()->handle());
            curve->Reverse();
            Py_Return;
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    return nullptr;
}

namespace Part
{
extern Py::Object shape2pyshape(const TopoDS_Shape& shape);

void create3dCurve(const TopoDS_Edge& edge)
{
    TopoDS_Edge edge3d;
    BRepAdaptor_Curve adapt_curve(edge);
    switch (adapt_curve.GetType()) {
        case GeomAbs_Line: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Line(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        case GeomAbs_Circle: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Circle(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        case GeomAbs_Ellipse: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Ellipse(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        case GeomAbs_Hyperbola: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Hyperbola(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        case GeomAbs_Parabola: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Parabola(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        case GeomAbs_BezierCurve: {
            BRepBuilderAPI_MakeEdge mkBuilder3d(
                adapt_curve.Bezier(),
                adapt_curve.FirstParameter(),
                adapt_curve.LastParameter()
            );
            edge3d = mkBuilder3d.Edge();
        } break;
        default:
            edge3d = edge;
            BRepLib::BuildCurves3d(edge3d, Precision::Confusion(), GeomAbs_Shape::GeomAbs_C1, 14, 10000);
            break;
    }
    Standard_Real aFirst, aLast;
    Handle(Geom_Curve) curve = BRep_Tool::Curve(edge3d, aFirst, aLast);
    BRep_Builder builder;
    builder.UpdateEdge(edge, curve, Precision::Confusion());
    builder.Range(edge, aFirst, aLast, true);
    return;
}
}  // namespace Part

PyObject* Curve2dPy::toShape(PyObject* args) const
{
    if (PyArg_ParseTuple(args, "")) {
        try {
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepBuilderAPI_MakeEdge2d mkBuilder(curv);
            TopoDS_Shape edge = mkBuilder.Shape();
            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_Clear();
    double u1, u2;
    if (PyArg_ParseTuple(args, "dd", &u1, &u2)) {
        try {
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepBuilderAPI_MakeEdge2d mkBuilder(curv, u1, u2);
            TopoDS_Shape edge = mkBuilder.Shape();
            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_Clear();
    PyObject* p;
    if (PyArg_ParseTuple(args, "O!", &(Part::GeometrySurfacePy::Type), &p)) {
        try {
            Handle(Geom_Surface) surf = Handle(Geom_Surface)::DownCast(
                static_cast<GeometrySurfacePy*>(p)->getGeomSurfacePtr()->handle()
            );
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepBuilderAPI_MakeEdge mkBuilder(curv, surf);
            TopoDS_Edge edge = mkBuilder.Edge();
            create3dCurve(edge);

            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_Clear();
    if (PyArg_ParseTuple(args, "O!dd", &(Part::GeometrySurfacePy::Type), &p, &u1, &u2)) {
        try {
            Handle(Geom_Surface) surf = Handle(Geom_Surface)::DownCast(
                static_cast<GeometrySurfacePy*>(p)->getGeomSurfacePtr()->handle()
            );
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepBuilderAPI_MakeEdge mkBuilder(curv, surf, u1, u2);
            TopoDS_Edge edge = mkBuilder.Edge();
            create3dCurve(edge);

            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {

            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_Clear();
    if (PyArg_ParseTuple(args, "O!", &(Part::TopoShapeFacePy::Type), &p)) {
        try {
            const TopoDS_Face& face = TopoDS::Face(
                static_cast<TopoShapeFacePy*>(p)->getTopoShapePtr()->getShape()
            );
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepAdaptor_Surface adapt(face);
            BRepBuilderAPI_MakeEdge mkBuilder(curv, adapt.Surface().Surface());
            TopoDS_Edge edge = mkBuilder.Edge();
            create3dCurve(edge);

            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_Clear();
    if (PyArg_ParseTuple(args, "O!dd", &(Part::TopoShapeFacePy::Type), &p, &u1, &u2)) {
        try {
            const TopoDS_Face& face = TopoDS::Face(
                static_cast<TopoShapeFacePy*>(p)->getTopoShapePtr()->getShape()
            );
            Handle(Geom2d_Curve) curv = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());

            BRepAdaptor_Surface adapt(face);
            BRepBuilderAPI_MakeEdge mkBuilder(curv, adapt.Surface().Surface(), u1, u2);
            TopoDS_Edge edge = mkBuilder.Edge();
            create3dCurve(edge);

            return Py::new_reference_to(shape2pyshape(edge));
        }
        catch (Standard_Failure& e) {
            PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
            return nullptr;
        }
    }

    PyErr_SetString(PyExc_TypeError, "empty parameter list, parameter range or surface expected");
    return nullptr;
}

PyObject* Curve2dPy::discretize(PyObject* args, PyObject* kwds) const
{
    try {
        Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
        Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
        if (c.IsNull()) {
            PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
            return nullptr;
        }

        Geom2dAdaptor_Curve adapt(c);
        double first = adapt.FirstParameter();
        double last = adapt.LastParameter();

        // use Number kwds
        static const std::array<const char*, 4> kwds_numPoints {"Number", "First", "Last", nullptr};
        PyErr_Clear();
        int numPoints = -1;
        if (Base::Wrapped_ParseTupleAndKeywords(
                args,
                kwds,
                "i|dd",
                kwds_numPoints,
                &numPoints,
                &first,
                &last
            )) {
            GCPnts_UniformAbscissa discretizer;
            discretizer.Initialize(adapt, numPoints, first, last);

            if (discretizer.IsDone() && discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();

                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt2d p = adapt.Value(discretizer.Parameter(i));
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }

        // use Distance kwds
        static const std::array<const char*, 4> kwds_Distance {"Distance", "First", "Last", nullptr};
        PyErr_Clear();
        double distance = -1;
        if (Base::Wrapped_ParseTupleAndKeywords(args, kwds, "d|dd", kwds_Distance, &distance, &first, &last)) {
            GCPnts_UniformAbscissa discretizer;
            discretizer.Initialize(adapt, distance, first, last);

            if (discretizer.IsDone() && discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();

                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt2d p = adapt.Value(discretizer.Parameter(i));
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }

        // use Deflection kwds
        static const std::array<const char*, 4> kwds_Deflection {"Deflection", "First", "Last", nullptr};
        PyErr_Clear();
        double deflection;
        if (Base::Wrapped_ParseTupleAndKeywords(
                args,
                kwds,
                "d|dd",
                kwds_Deflection,
                &deflection,
                &first,
                &last
            )) {
            GCPnts_UniformDeflection discretizer(adapt, deflection, first, last);
            if (discretizer.IsDone() && discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();

                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt p = discretizer.Value(i);
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }

        // use TangentialDeflection kwds
        static const std::array<const char*, 6>
            kwds_TangentialDeflection {"Angular", "Curvature", "First", "Last", "Minimum", nullptr};
        PyErr_Clear();
        double angular;
        double curvature;
        int minimumPoints = 2;
        if (Base::Wrapped_ParseTupleAndKeywords(
                args,
                kwds,
                "dd|ddi",
                kwds_TangentialDeflection,
                &angular,
                &curvature,
                &first,
                &last,
                &minimumPoints
            )) {
            GCPnts_TangentialDeflection discretizer(adapt, first, last, angular, curvature, minimumPoints);
            if (discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();

                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt p = discretizer.Value(i);
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }

        // use QuasiNumber kwds
        static const std::array<const char*, 4> kwds_QuasiNumPoints {
            "QuasiNumber",
            "First",
            "Last",
            nullptr
        };
        PyErr_Clear();
        int quasiNumPoints;
        if (Base::Wrapped_ParseTupleAndKeywords(
                args,
                kwds,
                "i|dd",
                kwds_QuasiNumPoints,
                &quasiNumPoints,
                &first,
                &last
            )) {
            GCPnts_QuasiUniformAbscissa discretizer(adapt, quasiNumPoints, first, last);
            if (discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();

                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt2d p = adapt.Value(discretizer.Parameter(i));
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }

        // use QuasiDeflection kwds
        static const std::array<const char*, 4> kwds_QuasiDeflection {
            "QuasiDeflection",
            "First",
            "Last",
            nullptr
        };
        PyErr_Clear();
        double quasiDeflection;
        if (Base::Wrapped_ParseTupleAndKeywords(
                args,
                kwds,
                "d|dd",
                kwds_QuasiDeflection,
                &quasiDeflection,
                &first,
                &last
            )) {
            GCPnts_QuasiUniformDeflection discretizer(adapt, quasiDeflection, first, last);
            if (discretizer.NbPoints() > 0) {
                Py::List points;
                int nbPoints = discretizer.NbPoints();
                for (int i = 1; i <= nbPoints; i++) {
                    gp_Pnt p = discretizer.Value(i);
                    points.append(Base::Vector2dPy::create(p.X(), p.Y()));
                }

                return Py::new_reference_to(points);
            }
            else {
                PyErr_SetString(PartExceptionOCCError, "Discretization of curve failed");
                return nullptr;
            }
        }
    }
    catch (const Base::Exception& e) {
        PyErr_SetString(PartExceptionOCCError, e.what());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Wrong arguments");
    return nullptr;
}

PyObject* Curve2dPy::length(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u = c->FirstParameter();
            double v = c->LastParameter();
            double t = Precision::Confusion();
            if (!PyArg_ParseTuple(args, "|ddd", &u, &v, &t)) {
                return nullptr;
            }
            Geom2dAdaptor_Curve adapt(c);
            double len = GCPnts_AbscissaPoint::Length(adapt, u, v, t);
            return PyFloat_FromDouble(len);
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::parameterAtDistance(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double abscissa;
            double u = 0;
            if (!PyArg_ParseTuple(args, "d|d", &abscissa, &u)) {
                return nullptr;
            }
            Geom2dAdaptor_Curve adapt(c);
            GCPnts_AbscissaPoint abscissaPoint(adapt, abscissa, u);
            double parm = abscissaPoint.Parameter();
            return PyFloat_FromDouble(parm);
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::value(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u;
            if (!PyArg_ParseTuple(args, "d", &u)) {
                return nullptr;
            }
            gp_Pnt2d p = c->Value(u);
            return Py::new_reference_to(Base::Vector2dPy::create(p.X(), p.Y()));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::tangent(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u;
            if (!PyArg_ParseTuple(args, "d", &u)) {
                return nullptr;
            }
            gp_Dir2d dir;
            Geom2dLProp_CLProps2d prop(c, u, 2, Precision::Confusion());
            if (prop.IsTangentDefined()) {
                prop.Tangent(dir);
            }

            return Py::new_reference_to(Base::Vector2dPy::create(dir.X(), dir.Y()));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::normal(PyObject* args) const
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u;
            if (!PyArg_ParseTuple(args, "d", &u)) {
                return nullptr;
            }
            gp_Dir2d dir;
            Geom2dLProp_CLProps2d prop(c, u, 2, Precision::Confusion());
            prop.Normal(dir);

            return Py::new_reference_to(Base::Vector2dPy::create(dir.X(), dir.Y()));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::curvature(PyObject* args) const
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u;
            if (!PyArg_ParseTuple(args, "d", &u)) {
                return nullptr;
            }
            Geom2dLProp_CLProps2d prop(c, u, 2, Precision::Confusion());
            double C = prop.Curvature();
            return Py::new_reference_to(Py::Float(C));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::centerOfCurvature(PyObject* args) const
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u;
            if (!PyArg_ParseTuple(args, "d", &u)) {
                return nullptr;
            }
            Geom2dLProp_CLProps2d prop(c, u, 2, Precision::Confusion());
            gp_Pnt2d pnt;
            prop.CentreOfCurvature(pnt);

            return Py::new_reference_to(Base::Vector2dPy::create(pnt.X(), pnt.Y()));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::parameter(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            PyObject* p;
            if (!PyArg_ParseTuple(args, "O!", Base::Vector2dPy::type_object(), &p)) {
                return nullptr;
            }
            Base::Vector2d v = Py::toVector2d(p);
            gp_Pnt2d pnt(v.x, v.y);
            Geom2dAPI_ProjectPointOnCurve ppc(pnt, c);
            double val = ppc.LowerDistanceParameter();
            return Py::new_reference_to(Py::Float(val));
        }
    }
    catch (Standard_Failure& e) {

        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::toBSpline(PyObject* args)
{
    Handle(Geom2d_Geometry) g = getGeometry2dPtr()->handle();
    Handle(Geom2d_Curve) c = Handle(Geom2d_Curve)::DownCast(g);
    try {
        if (!c.IsNull()) {
            double u, v;
            u = c->FirstParameter();
            v = c->LastParameter();
            if (!PyArg_ParseTuple(args, "|dd", &u, &v)) {
                return nullptr;
            }
            ShapeConstruct_Curve scc;
            Handle(Geom2d_BSplineCurve) spline = scc.ConvertToBSpline(c, u, v, Precision::Confusion());
            if (spline.IsNull()) {
                Standard_NullValue::Raise("Conversion to B-spline failed");
            }
            return new BSplineCurve2dPy(new Geom2dBSplineCurve(spline));
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
    return nullptr;
}

PyObject* Curve2dPy::approximateBSpline(PyObject* args)
{
    double tolerance;
    int maxSegment, maxDegree;
    const char* order = "C2";
    if (!PyArg_ParseTuple(args, "dii|s", &tolerance, &maxSegment, &maxDegree, &order)) {
        return nullptr;
    }

    GeomAbs_Shape absShape;
    std::string str = order;
    if (str == "C0") {
        absShape = GeomAbs_C0;
    }
    else if (str == "G1") {
        absShape = GeomAbs_G1;
    }
    else if (str == "C1") {
        absShape = GeomAbs_C1;
    }
    else if (str == "G2") {
        absShape = GeomAbs_G2;
    }
    else if (str == "C2") {
        absShape = GeomAbs_C2;
    }
    else if (str == "C3") {
        absShape = GeomAbs_C3;
    }
    else if (str == "CN") {
        absShape = GeomAbs_CN;
    }
    else {
        absShape = GeomAbs_C2;
    }

    try {
        Handle(Geom2d_Curve) self = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());
        Geom2dConvert_ApproxCurve approx(self, tolerance, absShape, maxSegment, maxDegree);
        if (approx.IsDone()) {
            return new BSplineCurve2dPy(new Geom2dBSplineCurve(approx.Curve()));
        }
        else if (approx.HasResult()) {
            std::stringstream str;
            str << "Maximum error (" << approx.MaxError() << ") is outside tolerance";
            PyErr_SetString(PyExc_RuntimeError, str.str().c_str());
            return nullptr;
        }
        else {
            PyErr_SetString(PyExc_RuntimeError, "Approximation of curve failed");
            return nullptr;
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
        return nullptr;
    }
}

Py::String Curve2dPy::getContinuity() const
{
    GeomAbs_Shape c = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle())->Continuity();
    std::string str;
    switch (c) {
        case GeomAbs_C0:
            str = "C0";
            break;
        case GeomAbs_G1:
            str = "G1";
            break;
        case GeomAbs_C1:
            str = "C1";
            break;
        case GeomAbs_G2:
            str = "G2";
            break;
        case GeomAbs_C2:
            str = "C2";
            break;
        case GeomAbs_C3:
            str = "C3";
            break;
        case GeomAbs_CN:
            str = "CN";
            break;
        default:
            str = "Unknown";
            break;
    }
    return Py::String(str);
}

Py::Boolean Curve2dPy::getClosed() const
{
    return Py::Boolean(
        Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle())->IsClosed() ? true : false
    );
}

Py::Boolean Curve2dPy::getPeriodic() const
{
    return Py::Boolean(
        Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle())->IsPeriodic() ? true : false
    );
}

Py::Float Curve2dPy::getFirstParameter() const
{
    return Py::Float(Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle())->FirstParameter());
}

Py::Float Curve2dPy::getLastParameter() const
{
    return Py::Float(Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle())->LastParameter());
}

PyObject* Curve2dPy::getCustomAttributes(const char* /*attr*/) const
{
    return nullptr;
}

int Curve2dPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
{
    return 0;
}

PyObject* Curve2dPy::intersectCC(PyObject* args) const
{
    Handle(Geom2d_Curve) curve1 = Handle(Geom2d_Curve)::DownCast(getGeometry2dPtr()->handle());
    try {
        if (!curve1.IsNull()) {
            PyObject* p;
            double prec = Precision::Confusion();
            if (!PyArg_ParseTuple(args, "O!|d", &(Part::Curve2dPy::Type), &p, &prec)) {
                return nullptr;
            }

            Handle(Geom2d_Curve) curve2 = Handle(Geom2d_Curve)::DownCast(
                static_cast<Geometry2dPy*>(p)->getGeometry2dPtr()->handle()
            );
            Py::List points;
            Geom2dAPI_InterCurveCurve intersector(curve1, curve2, prec);
            if ((intersector.NbPoints() == 0) && (intersector.NbSegments() == 0)) {
                // No intersection
                return Py::new_reference_to(Py::List());
            }
            if (intersector.NbPoints() > 0) {
                // Cross intersections
                for (int i = 1; i <= intersector.NbPoints(); i++) {
                    gp_Pnt2d p1 = intersector.Point(i);
                    points.append(Base::Vector2dPy::create(p1.X(), p1.Y()));
                }
            }
            if (intersector.NbSegments() > 0) {
                // Tangential intersections
                Geom2dAPI_ExtremaCurveCurve intersector2(
                    curve1,
                    curve2,
                    curve1->FirstParameter(),
                    curve1->LastParameter(),
                    curve2->FirstParameter(),
                    curve2->LastParameter()
                );
                for (int i = 1; i <= intersector2.NbExtrema(); i++) {
                    if (intersector2.Distance(i) > prec) {
                        continue;
                    }
                    gp_Pnt2d p1, p2;
                    intersector2.Points(i, p1, p2);
                    points.append(Base::Vector2dPy::create(p1.X(), p1.Y()));
                }
            }
            return Py::new_reference_to(points);
        }
    }
    catch (Standard_Failure& e) {
        PyErr_SetString(PyExc_RuntimeError, e.GetMessageString());
        return nullptr;
    }

    PyErr_SetString(PyExc_TypeError, "Geometry is not a curve");
    return nullptr;
}