/***************************************************************************
 *   Copyright (c) 2010 Juergen Riegel <FreeCAD@juergen-riegel.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 "PreCompiled.h"
#ifndef _PreComp_
# include <functional>
# include <Bnd_Box.hxx>
# include <BRep_Builder.hxx>
# include <BRepBndLib.hxx>
# include <BRepBuilderAPI_Copy.hxx>
# include <BRepBuilderAPI_MakeFace.hxx>
# include <BRepAdaptor_Surface.hxx>
# include <BRepCheck_Analyzer.hxx>
# include <BRep_Tool.hxx>
# include <BRepExtrema_DistShapeShape.hxx>
# include <BRepPrimAPI_MakePrism.hxx>
# include <BRepProj_Projection.hxx>
# include <Geom_Plane.hxx>
# include <TopoDS.hxx>
# include <TopoDS_Compound.hxx>
# include <TopoDS_Face.hxx>
# include <TopoDS_Wire.hxx>
# include <TopoDS_Vertex.hxx>
# include <TopExp_Explorer.hxx>
# include <gp_Ax1.hxx>
# include <gp_Pln.hxx>
# include <ShapeFix_Face.hxx>
# include <ShapeFix_Wire.hxx>
# include <ShapeAnalysis.hxx>
# include <TopTools_IndexedMapOfShape.hxx>
# include <TopExp.hxx>
# include <IntTools_FClass2d.hxx>
# include <ShapeAnalysis_Surface.hxx>
# include <ShapeFix_Shape.hxx>
# include <Standard_Version.hxx>
# include <BRepBuilderAPI_MakeEdge.hxx>
# include <Extrema_ExtCC.hxx>
# include <Extrema_POnCurv.hxx>
# include <BRepAdaptor_CompCurve.hxx>
# include <BRepAdaptor_Curve.hxx>
# include <Standard_Version.hxx>
# include <GProp_GProps.hxx>
# include <BRepGProp.hxx>
#endif

#include <BRepExtrema_DistShapeShape.hxx>
#include <TopExp.hxx>
#include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
#include <BRepLProp_SLProps.hxx>
#include <BRepGProp_Face.hxx>

#include <Base/Exception.h>
#include <Base/Parameter.h>
#include <Base/Reader.h>
#include <Base/Console.h>
#include <App/Application.h>
#include <App/OriginFeature.h>
#include <App/Document.h>
#include <Mod/Part/App/modelRefine.h>
#include "FeatureSketchBased.h"
#include "DatumPlane.h"
#include "DatumLine.h"

using namespace PartDesign;

// sort bounding boxes according to diagonal length
class ProfileBased::Wire_Compare : public std::binary_function<const TopoDS_Wire&,
                                                              const TopoDS_Wire&, bool> {
public:
    bool operator() (const TopoDS_Wire& w1, const TopoDS_Wire& w2)
    {
        Bnd_Box box1, box2;
        if (!w1.IsNull()) {
            BRepBndLib::Add(w1, box1);
            box1.SetGap(0.0);
        }

        if (!w2.IsNull()) {
            BRepBndLib::Add(w2, box2);
            box2.SetGap(0.0);
        }

        return box1.SquareExtent() < box2.SquareExtent();
    }
};

PROPERTY_SOURCE(PartDesign::ProfileBased, PartDesign::FeatureAddSub)

ProfileBased::ProfileBased()
{
    ADD_PROPERTY_TYPE(Profile,(0),"SketchBased", App::Prop_None, "Reference to sketch");
    ADD_PROPERTY_TYPE(Midplane,(0),"SketchBased", App::Prop_None, "Extrude symmetric to sketch face");
    ADD_PROPERTY_TYPE(Reversed, (0),"SketchBased", App::Prop_None, "Reverse extrusion direction");
    ADD_PROPERTY_TYPE(UpToFace,(0),"SketchBased",(App::PropertyType)(App::Prop_None),"Face where feature will end");
}

short ProfileBased::mustExecute() const
{
    if (Profile.isTouched() ||
        Midplane.isTouched() ||
        Reversed.isTouched() ||
        UpToFace.isTouched())
        return 1;
    return PartDesign::FeatureAddSub::mustExecute();
}

void ProfileBased::positionByPrevious(void)
{
    Part::Feature* feat = getBaseObject(/* silent = */ true);
    if (feat) {
        this->Placement.setValue(feat->Placement.getValue());
    } else {
        //no base. Use either Sketch support's placement, or sketch's placement itself.
        Part::Part2DObject *sketch = getVerifiedSketch();
        App::DocumentObject* support = sketch->Support.getValue();
        if(support && support->isDerivedFrom(App::GeoFeature::getClassTypeId())) {
            this->Placement.setValue(static_cast<App::GeoFeature*>(support)->Placement.getValue());
        } else {
            this->Placement.setValue( sketch->Placement.getValue() );
        }
    }
}

void ProfileBased::transformPlacement(const Base::Placement &transform)
{
    Part::Feature* feat = getBaseObject(/* silent = */ true);
    if (feat) {
        feat->transformPlacement(transform);
    } else {
        Part::Part2DObject *sketch = getVerifiedSketch();
        sketch->transformPlacement(transform);
    }
    positionByPrevious();
}

Part::Part2DObject* ProfileBased::getVerifiedSketch(bool silent) const {
    App::DocumentObject* result = Profile.getValue();
    const char* err = nullptr;

    if (!result) {
        err = "No profile linked at all";
    } else {
        if (!result->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
            err = "Linked object is not a Sketch or Part2DObject";
            result = nullptr;
        }
    }

    if (!silent && err) {
        throw Base::Exception (err);
    }

    return static_cast<Part::Part2DObject*>(result);
}

Part::Feature* ProfileBased::getVerifiedObject(bool silent) const {

    App::DocumentObject* result = Profile.getValue();
    const char* err = nullptr;

    if (!result) {
        err = "No object linked";
    } else {
        if (!result->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
            err = "Linked object is not a Sketch, Part2DObject or Feature";
    }

    if (!silent && err) {
        throw Base::Exception (err);
    }

    return static_cast<Part::Feature*>(result);
}

TopoDS_Shape ProfileBased::getVerifiedFace(bool silent) const {

    App::DocumentObject* result = Profile.getValue();
    const char* err = nullptr;

    if (!result) {
        err = "No profile linked";
    } else {
        if (result->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
            
            auto wires = getProfileWires();
            return makeFace(wires);
        }
        else if(result->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId())) {
            if(Profile.getSubValues().empty())
                err = "Linked object has no subshape specified";
            else {
                
                const Part::TopoShape& shape = Profile.getValue<Part::Feature*>()->Shape.getShape();
                TopoDS_Shape sub = shape.getSubShape(Profile.getSubValues()[0].c_str());
                if(sub.ShapeType() == TopAbs_FACE) 
                    return TopoDS::Face(sub);
                else if(sub.ShapeType() == TopAbs_WIRE) {
                
                    auto wire = TopoDS::Wire(sub);
                    if(!wire.Closed())
                        err = "Linked wire is not closed";
                    else {
                        BRepBuilderAPI_MakeFace mk(wire);
                        mk.Build();
                        return TopoDS::Face(mk.Shape());
                    }                        
                }
                else 
                    err = "Linked Subshape cannot be used";
            }
        }
        else 
            err = "Linked object is neither Sketch, Part2DObject or Part::Feature";
    }

    if (!silent && err) {
        throw Base::Exception (err);
    }

    return TopoDS_Face();
}


std::vector<TopoDS_Wire> ProfileBased::getProfileWires() const {
    std::vector<TopoDS_Wire> result;

    if(!Profile.getValue() || !Profile.getValue()->isDerivedFrom(Part::Feature::getClassTypeId()))
        throw Base::Exception("No valid profile linked");
    
    TopoDS_Shape shape;
    if(Profile.getValue()->isDerivedFrom(Part::Part2DObject::getClassTypeId()))
        shape = Profile.getValue<Part::Part2DObject*>()->Shape.getValue();
    else {
        if(Profile.getSubValues().empty()) 
            throw Base::Exception("No valid subelement linked in Part::Feature");

        shape = Profile.getValue<Part::Feature*>()->Shape.getShape().getSubShape(Profile.getSubValues().front().c_str());
    }
    
    if (shape.IsNull())
        throw Base::Exception("Linked shape object is empty");

    // this is a workaround for an obscure OCC bug which leads to empty tessellations
    // for some faces. Making an explicit copy of the linked shape seems to fix it.
    // The error almost happens when re-computing the shape but sometimes also for the
    // first time
    BRepBuilderAPI_Copy copy(shape);
    shape = copy.Shape();
    if (shape.IsNull())
        throw Base::Exception("Linked shape object is empty");

    TopExp_Explorer ex;
    for (ex.Init(shape, TopAbs_WIRE); ex.More(); ex.Next()) {
        result.push_back(TopoDS::Wire(ex.Current()));
    }
    if (result.empty()) // there can be several wires
        throw Base::Exception("Linked shape object is not a wire");

    return result;
}

// Note: We cannot return a reference, because it will become Null.
// Not clear where, because we check for IsNull() here, but as soon as it is passed out of
// this method, it becomes null!
const TopoDS_Face ProfileBased::getSupportFace() const {
    const Part::Part2DObject* sketch = getVerifiedSketch();
    if (sketch->MapMode.getValue() == Attacher::mmFlatFace  &&  sketch->Support.getValue()) {
        const auto &Support = sketch->Support;
        App::DocumentObject* ref = Support.getValue();

        Part::Feature *part = static_cast<Part::Feature*>(ref);
        if (part && part->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId())) {
            const std::vector<std::string> &sub = Support.getSubValues();
            assert(sub.size()==1);
            // get the selected sub shape (a Face)
            const Part::TopoShape &shape = part->Shape.getShape();
            if (shape.getShape().IsNull())
                throw Base::Exception("Sketch support shape is empty!");

            TopoDS_Shape sh = shape.getSubShape(sub[0].c_str());
            if (sh.IsNull())
                throw Base::Exception("Null shape in SketchBased::getSupportFace()!");

            const TopoDS_Face face = TopoDS::Face(sh);
            if (face.IsNull())
                throw Base::Exception("Null face in SketchBased::getSupportFace()!");

            BRepAdaptor_Surface adapt(face);
            if (adapt.GetType() != GeomAbs_Plane)
                throw Base::Exception("No planar face in SketchBased::getSupportFace()!");

            return face;
        }
    }
    return TopoDS::Face(Feature::makeShapeFromPlane(sketch));

}

int ProfileBased::getSketchAxisCount(void) const
{
    Part::Part2DObject *sketch = static_cast<Part::Part2DObject*>(Profile.getValue());
    if (!sketch)
        return -1; // the link to the sketch is lost
    return sketch->getAxisCount();
}

Part::Feature *ProfileBased::getBaseObject(bool silent) const
{
    // Test the base's class feature.
    Part::Feature *rv = Feature::getBaseObject(/* silent = */ true);
    if (rv) {
        return rv;
    }

    // getVerifiedObject() may throw it's own exception if fail
    Part::Feature* obj = getVerifiedObject(silent);

    if(!obj)
        return nullptr;
    
    if (!obj->isDerivedFrom(Part::Part2DObject::getClassTypeId()))
        return obj;

    //due to former test we know we have a 2d object
    Part::Part2DObject* sketch = getVerifiedSketch(silent);
    const char* err = nullptr;

    App::DocumentObject* spt = sketch->Support.getValue();
    if (spt) {
        if (spt->isDerivedFrom(Part::Feature::getClassTypeId())) {
            rv = static_cast<Part::Feature*>(spt);
        } else {
            err = "No base set, sketch support is not Part::Feature";
        }
    } else {
        err = "No base set, no sketch support either";
    }

    if (!silent && err) {
        throw Base::Exception (err);
    }

    return rv;
}

void ProfileBased::onChanged(const App::Property* prop)
{
    if (prop == &Profile) {
        // if attached to a sketch then mark it as read-only
        this->Placement.setStatus(App::Property::ReadOnly, Profile.getValue() != 0);
    }

    FeatureAddSub::onChanged(prop);
}

bool ProfileBased::isInside(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2) const
{
    Bnd_Box box1;
    BRepBndLib::Add(wire1, box1);
    box1.SetGap(0.0);

    Bnd_Box box2;
    BRepBndLib::Add(wire2, box2);
    box2.SetGap(0.0);

    if (box1.IsOut(box2))
        return false;

    double prec = Precision::Confusion();

    BRepBuilderAPI_MakeFace mkFace(wire1);
    if (!mkFace.IsDone())
        Standard_Failure::Raise("Failed to create a face from wire in sketch");
    TopoDS_Face face = validateFace(mkFace.Face());
    BRepAdaptor_Surface adapt(face);
    IntTools_FClass2d class2d(face, prec);
    Handle_Geom_Surface surf = new Geom_Plane(adapt.Plane());
    ShapeAnalysis_Surface as(surf);

    TopExp_Explorer xp(wire2,TopAbs_VERTEX);
    while (xp.More())  {
        TopoDS_Vertex v = TopoDS::Vertex(xp.Current());
        gp_Pnt p = BRep_Tool::Pnt(v);
        gp_Pnt2d uv = as.ValueOfUV(p, prec);
        if (class2d.Perform(uv) == TopAbs_IN)
            return true;
        // TODO: We can make a check to see if all points are inside or all outside
        // because otherwise we have some intersections which is not allowed
        else
            return false;
        xp.Next();
    }

    return false;
}

TopoDS_Face ProfileBased::validateFace(const TopoDS_Face& face) const
{
    BRepCheck_Analyzer aChecker(face);
    if (!aChecker.IsValid()) {
        TopoDS_Wire outerwire = ShapeAnalysis::OuterWire(face);
        TopTools_IndexedMapOfShape myMap;
        myMap.Add(outerwire);

        TopExp_Explorer xp(face,TopAbs_WIRE);
        ShapeFix_Wire fix;
        fix.SetFace(face);
        fix.Load(outerwire);
        fix.Perform();
        BRepBuilderAPI_MakeFace mkFace(fix.WireAPIMake());
        while (xp.More()) {
            if (!myMap.Contains(xp.Current())) {
                fix.Load(TopoDS::Wire(xp.Current()));
                fix.Perform();
                mkFace.Add(fix.WireAPIMake());
            }
            xp.Next();
        }

        aChecker.Init(mkFace.Face());
        if (!aChecker.IsValid()) {
            ShapeFix_Shape fix(mkFace.Face());
            fix.SetPrecision(Precision::Confusion());
            fix.SetMaxTolerance(Precision::Confusion());
            fix.SetMaxTolerance(Precision::Confusion());
            fix.Perform();
            fix.FixWireTool()->Perform();
            fix.FixFaceTool()->Perform();
            TopoDS_Face fixedFace = TopoDS::Face(fix.Shape());
            aChecker.Init(fixedFace);
            if (!aChecker.IsValid())
                Standard_Failure::Raise("Failed to validate broken face");
            return fixedFace;
        }
        return mkFace.Face();
    }

    return face;
}

TopoDS_Shape ProfileBased::makeFace(std::list<TopoDS_Wire>& wires) const
{
    BRepBuilderAPI_MakeFace mkFace(wires.front());
    const TopoDS_Face& face = mkFace.Face();
    if (face.IsNull())
        return face;
    gp_Dir axis(0,0,1);
    BRepAdaptor_Surface adapt(face);
    if (adapt.GetType() == GeomAbs_Plane) {
        axis = adapt.Plane().Axis().Direction();
    }

    wires.pop_front();
    for (std::list<TopoDS_Wire>::iterator it = wires.begin(); it != wires.end(); ++it) {
        BRepBuilderAPI_MakeFace mkInnerFace(*it);
        const TopoDS_Face& inner_face = mkInnerFace.Face();
        if (inner_face.IsNull())
            return inner_face; // failure
        gp_Dir inner_axis(0,0,1);
        BRepAdaptor_Surface adapt(inner_face);
        if (adapt.GetType() == GeomAbs_Plane) {
            inner_axis = adapt.Plane().Axis().Direction();
        }
        // It seems that orientation is always 'Forward' and we only have to reverse
        // if the underlying plane have opposite normals.
        if (axis.Dot(inner_axis) < 0)
            it->Reverse();
        mkFace.Add(*it);
    }
    return validateFace(mkFace.Face());
}

TopoDS_Shape ProfileBased::makeFace(const std::vector<TopoDS_Wire>& w) const
{
    if (w.empty())
        return TopoDS_Shape();

    //FIXME: Need a safe method to sort wire that the outermost one comes last
    // Currently it's done with the diagonal lengths of the bounding boxes
#if 1
    std::vector<TopoDS_Wire> wires = w;
    std::sort(wires.begin(), wires.end(), Wire_Compare());
    std::list<TopoDS_Wire> wire_list;
    wire_list.insert(wire_list.begin(), wires.rbegin(), wires.rend());
#else
    //bug #0001133: try alternative sort algorithm
    std::list<TopoDS_Wire> unsorted_wire_list;
    unsorted_wire_list.insert(unsorted_wire_list.begin(), w.begin(), w.end());
    std::list<TopoDS_Wire> wire_list;
    Wire_Compare wc;
    while (!unsorted_wire_list.empty()) {
        std::list<TopoDS_Wire>::iterator w_ref = unsorted_wire_list.begin();
        std::list<TopoDS_Wire>::iterator w_it = unsorted_wire_list.begin();
        for (++w_it; w_it != unsorted_wire_list.end(); ++w_it) {
            if (wc(*w_ref, *w_it))
                w_ref = w_it;
        }
        wire_list.push_back(*w_ref);
        unsorted_wire_list.erase(w_ref);
    }
#endif

    // separate the wires into several independent faces
    std::list< std::list<TopoDS_Wire> > sep_wire_list;
    while (!wire_list.empty()) {
        std::list<TopoDS_Wire> sep_list;
        TopoDS_Wire wire = wire_list.front();
        wire_list.pop_front();
        sep_list.push_back(wire);

        std::list<TopoDS_Wire>::iterator it = wire_list.begin();
        while (it != wire_list.end()) {
            if (isInside(wire, *it)) {
                sep_list.push_back(*it);
                it = wire_list.erase(it);
            }
            else {
                ++it;
            }
        }

        sep_wire_list.push_back(sep_list);
    }

    if (sep_wire_list.size() == 1) {
        std::list<TopoDS_Wire>& wires = sep_wire_list.front();
        return makeFace(wires);
    }
    else if (sep_wire_list.size() > 1) {
        TopoDS_Compound comp;
        BRep_Builder builder;
        builder.MakeCompound(comp);
        for (std::list< std::list<TopoDS_Wire> >::iterator it = sep_wire_list.begin(); it != sep_wire_list.end(); ++it) {
            TopoDS_Shape aFace = makeFace(*it);
            if (!aFace.IsNull())
                builder.Add(comp, aFace);
        }

        return comp;
    }
    else {
        return TopoDS_Shape(); // error
    }
}

void ProfileBased::getUpToFaceFromLinkSub(TopoDS_Face& upToFace,
                                         const App::PropertyLinkSub& refFace)
{
    App::DocumentObject* ref = refFace.getValue();
    std::vector<std::string> subStrings = refFace.getSubValues();

    if (ref == NULL)
        throw Base::Exception("SketchBased: Up to face: No face selected");

    if (ref->getTypeId().isDerivedFrom(App::Plane::getClassTypeId())) {
        upToFace = TopoDS::Face(makeShapeFromPlane(ref));
        return;
    } else if (ref->getTypeId().isDerivedFrom(PartDesign::Plane::getClassTypeId())) {
        Part::Datum* datum = static_cast<Part::Datum*>(ref);
        upToFace = TopoDS::Face(datum->getShape());
        return;
    }

    if (!ref->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
        throw Base::Exception("SketchBased: Up to face: Must be face of a feature");
    Part::TopoShape baseShape = static_cast<Part::Feature*>(ref)->Shape.getShape();

    if (subStrings.empty() || subStrings[0].empty())
        throw Base::Exception("SketchBased: Up to face: No face selected");
    // TODO: Check for multiple UpToFaces?

    upToFace = TopoDS::Face(baseShape.getSubShape(subStrings[0].c_str()));
    if (upToFace.IsNull())
        throw Base::Exception("SketchBased: Up to face: Failed to extract face");
}

void ProfileBased::getUpToFace(TopoDS_Face& upToFace,
                              const TopoDS_Shape& support,
                              const TopoDS_Face& supportface,
                              const TopoDS_Shape& sketchshape,
                              const std::string& method,
                              const gp_Dir& dir,
                              const double offset)
{
    if ((method == "UpToLast") || (method == "UpToFirst")) {
        // Check for valid support object
        if (support.IsNull())
            throw Base::Exception("SketchBased: Up to face: No support in Sketch and no base feature!");

        std::vector<Part::cutFaces> cfaces = Part::findAllFacesCutBy(support, sketchshape, dir);
        if (cfaces.empty())
            throw Base::Exception("SketchBased: Up to face: No faces found in this direction");

        // Find nearest/furthest face
        std::vector<Part::cutFaces>::const_iterator it, it_near, it_far;
        it_near = it_far = cfaces.begin();
        for (it = cfaces.begin(); it != cfaces.end(); it++)
            if (it->distsq > it_far->distsq)
                it_far = it;
            else if (it->distsq < it_near->distsq)
                it_near = it;
        upToFace = (method == "UpToLast" ? it_far->face : it_near->face);
    }

    // Check whether the face has limits or not. Unlimited faces have no wire
    // Note: Datum planes are always unlimited
    TopExp_Explorer Ex(upToFace,TopAbs_WIRE);
    if (Ex.More()) {
        // Remove the limits of the upToFace so that the extrusion works even if sketchshape is larger
        // than the upToFace
        bool remove_limits = false;
        for (Ex.Init(sketchshape,TopAbs_FACE); Ex.More(); Ex.Next()) {
            // Get outermost wire of sketch face
            TopoDS_Face sketchface = TopoDS::Face(Ex.Current());
            TopoDS_Wire outerWire = ShapeAnalysis::OuterWire(sketchface);
            if (!checkWireInsideFace(outerWire, upToFace, dir)) {
                remove_limits = true;
                break;
            }
        }

        if (remove_limits) {
            // Note: Using an unlimited face every time gives unnecessary failures for concave faces
            TopLoc_Location loc = upToFace.Location();
            BRepAdaptor_Surface adapt(upToFace, Standard_False);
            BRepBuilderAPI_MakeFace mkFace(adapt.Surface().Surface()
    #if OCC_VERSION_HEX >= 0x060502
                  , Precision::Confusion()
    #endif
            );
            if (!mkFace.IsDone())
                throw Base::Exception("SketchBased: Up To Face: Failed to create unlimited face");
            upToFace = TopoDS::Face(mkFace.Shape());
            upToFace.Location(loc);
        }
    }

    // Check that the upToFace does not intersect the sketch face and
    // is not parallel to the extrusion direction (for simplicity, supportface is used instead of sketchshape)
    BRepAdaptor_Surface adapt1(TopoDS::Face(supportface));
    BRepAdaptor_Surface adapt2(TopoDS::Face(upToFace));

    if (adapt2.GetType() == GeomAbs_Plane) {
        if (adapt1.Plane().Axis().IsNormal(adapt2.Plane().Axis(), Precision::Confusion()))
            throw Base::Exception("SketchBased: Up to face: Must not be parallel to extrusion direction!");
    }

    // We must measure from sketchshape, not supportface, here
    BRepExtrema_DistShapeShape distSS(sketchshape, upToFace);
    if (distSS.Value() < Precision::Confusion())
        throw Base::Exception("SketchBased: Up to face: Must not intersect sketch!");

    // Move the face in the extrusion direction
    // TODO: For non-planar faces, we could consider offsetting the surface
    if (fabs(offset) > Precision::Confusion()) {
        if (adapt2.GetType() == GeomAbs_Plane) {
            gp_Trsf mov;
            mov.SetTranslation(offset * gp_Vec(dir));
            TopLoc_Location loc(mov);
            upToFace.Move(loc);
        } else {
            throw Base::Exception("SketchBased: Up to Face: Offset not supported yet for non-planar faces");
        }
    }
}

void ProfileBased::generatePrism(TopoDS_Shape& prism,
                                const TopoDS_Shape& sketchshape,
                                const std::string& method,
                                const gp_Dir& dir,
                                const double L,
                                const double L2,
                                const bool midplane,
                                const bool reversed)
{
    if (method == "Length" || method == "TwoLengths" || method == "ThroughAll") {
        double Ltotal = L;
        double Loffset = 0.;
        if (method == "ThroughAll")
            // "ThroughAll" is modelled as a very long, but finite prism to avoid problems with pockets
            // Note: 1E6 created problems once...
            Ltotal = 1E4;


        if (method == "TwoLengths") {
            // midplane makes no sense here
            Loffset = -L2;
            Ltotal += L2;
        } else if (midplane)
            Loffset = -Ltotal/2;

        TopoDS_Shape from = sketchshape;
        if (method == "TwoLengths" || midplane) {
            gp_Trsf mov;
            mov.SetTranslation(Loffset * gp_Vec(dir));
            TopLoc_Location loc(mov);
            from = sketchshape.Moved(loc);
        } else if (reversed)
            Ltotal *= -1.0;

        // Its better not to use BRepFeat_MakePrism here even if we have a support because the
        // resulting shape creates problems with Pocket
        BRepPrimAPI_MakePrism PrismMaker(from, Ltotal*gp_Vec(dir), 0,1); // finite prism
        if (!PrismMaker.IsDone())
            throw Base::Exception("SketchBased: Length: Could not extrude the sketch!");
        prism = PrismMaker.Shape();
    } else {
        throw Base::Exception("SketchBased: Internal error: Unknown method for generatePrism()");
    }

}

const bool ProfileBased::checkWireInsideFace(const TopoDS_Wire& wire, const TopoDS_Face& face,
                                            const gp_Dir& dir) {
    // Project wire onto the face (face, not surface! So limits of face apply)
    // FIXME: The results of BRepProj_Projection do not seem to be very stable. Sometimes they return no result
    // even in the simplest projection case.
    // FIXME: Checking for Closed() is wrong because this has nothing to do with the wire itself being closed
    // But ShapeAnalysis_Wire::CheckClosed() doesn't give correct results either.
    BRepProj_Projection proj(wire, face, dir);
    return (proj.More() && proj.Current().Closed());
}

const bool ProfileBased::checkLineCrossesFace(const gp_Lin &line, const TopoDS_Face &face)
{
#if 1
    BRepBuilderAPI_MakeEdge mkEdge(line);
    TopoDS_Wire wire = ShapeAnalysis::OuterWire(face);
    BRepExtrema_DistShapeShape distss(wire, mkEdge.Shape(), Precision::Confusion());
    if (distss.IsDone()) {
        if (distss.Value() > Precision::Confusion())
            return false;
        // build up map vertex->edge
        TopTools_IndexedDataMapOfShapeListOfShape vertex2Edge;
        TopExp::MapShapesAndAncestors(wire, TopAbs_VERTEX, TopAbs_EDGE, vertex2Edge);

        for (Standard_Integer i=1; i<= distss.NbSolution(); i++) {
            if (distss.PointOnShape1(i).Distance(distss.PointOnShape2(i)) > Precision::Confusion())
                continue;
            BRepExtrema_SupportType type = distss.SupportTypeShape1(i);
            if (type == BRepExtrema_IsOnEdge) {
                TopoDS_Edge edge = TopoDS::Edge(distss.SupportOnShape1(i));
                BRepAdaptor_Curve adapt(edge);
                // create a plane (pnt,dir) that goes through the intersection point and is built of
                // the vectors of the sketch normal and the rotation axis
                const gp_Dir& normal = BRepAdaptor_Surface(face).Plane().Axis().Direction();
                gp_Dir dir = line.Direction().Crossed(normal);
                gp_Pnt pnt = distss.PointOnShape1(i);

                Standard_Real t;
                distss.ParOnEdgeS1(i, t);
                gp_Pnt p_eps1 = adapt.Value(std::max<double>(adapt.FirstParameter(), t-10*Precision::Confusion()));
                gp_Pnt p_eps2 = adapt.Value(std::min<double>(adapt.LastParameter(), t+10*Precision::Confusion()));

                // now check if we get a change in the sign of the distances
                Standard_Real dist_p_eps1_pnt = gp_Vec(p_eps1, pnt).Dot(gp_Vec(dir));
                Standard_Real dist_p_eps2_pnt = gp_Vec(p_eps2, pnt).Dot(gp_Vec(dir));
                // distance to the plane must be noticable
                if (fabs(dist_p_eps1_pnt) > 5*Precision::Confusion() &&
                    fabs(dist_p_eps2_pnt) > 5*Precision::Confusion()) {
                    if (dist_p_eps1_pnt * dist_p_eps2_pnt < 0)
                        return true;
                }
            }
            else if (type == BRepExtrema_IsVertex) {
                // for a vertex check the two adjacent edges if there is a change of sign
                TopoDS_Vertex vertex = TopoDS::Vertex(distss.SupportOnShape1(i));
                const TopTools_ListOfShape& edges = vertex2Edge.FindFromKey(vertex);
                if (edges.Extent() == 2) {
                    // create a plane (pnt,dir) that goes through the intersection point and is built of
                    // the vectors of the sketch normal and the rotation axis
                    BRepAdaptor_Surface adapt(face);
                    const gp_Dir& normal = adapt.Plane().Axis().Direction();
                    gp_Dir dir = line.Direction().Crossed(normal);
                    gp_Pnt pnt = distss.PointOnShape1(i);

                    // from the first edge get a point next to the intersection point
                    const TopoDS_Edge& edge1 = TopoDS::Edge(edges.First());
                    BRepAdaptor_Curve adapt1(edge1);
                    Standard_Real dist1 = adapt1.Value(adapt1.FirstParameter()).SquareDistance(pnt);
                    Standard_Real dist2 = adapt1.Value(adapt1.LastParameter()).SquareDistance(pnt);
                    gp_Pnt p_eps1;
                    if (dist1 < dist2)
                        p_eps1 = adapt1.Value(adapt1.FirstParameter() + 2*Precision::Confusion());
                    else
                        p_eps1 = adapt1.Value(adapt1.LastParameter() - 2*Precision::Confusion());

                    // from the second edge get a point next to the intersection point
                    const TopoDS_Edge& edge2 = TopoDS::Edge(edges.Last());
                    BRepAdaptor_Curve adapt2(edge2);
                    Standard_Real dist3 = adapt2.Value(adapt2.FirstParameter()).SquareDistance(pnt);
                    Standard_Real dist4 = adapt2.Value(adapt2.LastParameter()).SquareDistance(pnt);
                    gp_Pnt p_eps2;
                    if (dist3 < dist4)
                        p_eps2 = adapt2.Value(adapt2.FirstParameter() + 2*Precision::Confusion());
                    else
                        p_eps2 = adapt2.Value(adapt2.LastParameter() - 2*Precision::Confusion());

                    // now check if we get a change in the sign of the distances
                    Standard_Real dist_p_eps1_pnt = gp_Vec(p_eps1, pnt).Dot(gp_Vec(dir));
                    Standard_Real dist_p_eps2_pnt = gp_Vec(p_eps2, pnt).Dot(gp_Vec(dir));
                    // distance to the plane must be noticable
                    if (fabs(dist_p_eps1_pnt) > Precision::Confusion() &&
                        fabs(dist_p_eps2_pnt) > Precision::Confusion()) {
                        if (dist_p_eps1_pnt * dist_p_eps2_pnt < 0)
                            return true;
                    }
                }
            }
        }
    }

    return false;
#else
    // This is not as easy as it looks, because a distance of zero might be OK if
    // the axis touches the sketchshape in in a linear edge or a vertex
    // Note: This algorithm does not catch cases where the sketchshape touches the
    // axis in two or more points
    // Note: And it only works on closed outer wires
    TopoDS_Wire outerWire = ShapeAnalysis::OuterWire(face);
    BRepBuilderAPI_MakeEdge mkEdge(line);
    if (!mkEdge.IsDone())
        throw Base::Exception("Revolve: Unexpected OCE failure");
    BRepAdaptor_Curve axis(TopoDS::Edge(mkEdge.Shape()));

    TopExp_Explorer ex;
    int intersections = 0;
    std::vector<gp_Pnt> intersectionpoints;

    // Note: We need to look at evey edge separately to catch coincident lines
    for (ex.Init(outerWire, TopAbs_EDGE); ex.More(); ex.Next()) {
        BRepAdaptor_Curve edge(TopoDS::Edge(ex.Current()));
        Extrema_ExtCC intersector(axis, edge);

        if (intersector.IsDone()) {
            for (int i = 1; i <= intersector.NbExt(); i++) {


#if OCC_VERSION_HEX >= 0x060500
                if (intersector.SquareDistance(i) < Precision::Confusion()) {
#else
                if (intersector.Value(i) < Precision::Confusion()) {
#endif
                    if (intersector.IsParallel()) {
                        // A line that is coincident with the axis produces three intersections
                        // 1 with the line itself and 2 with the adjacent edges
                        intersections -= 2;
                    } else {
                        Extrema_POnCurv p1, p2;
                        intersector.Points(i, p1, p2);
                        intersectionpoints.push_back(p1.Value());
                        intersections++;
                    }
                }
            }
        }
    }

    // Note: We might check this inside the loop but then we have to rely on TopExp_Explorer
    // returning the wire's edges in adjacent order (because of the coincident line checking)
    if (intersections > 1) {
        // Check that we don't touch the sketchface just in two identical vertices
        if ((intersectionpoints.size() == 2) &&
            (intersectionpoints[0].IsEqual(intersectionpoints[1], Precision::Confusion())))
            return false;
        else
            return true;
    }

    return false;
#endif
}

void ProfileBased::remapSupportShape(const TopoDS_Shape& newShape)
{
    TopTools_IndexedMapOfShape faceMap;
    TopExp::MapShapes(newShape, TopAbs_FACE, faceMap);

    // here we must reset the placement otherwise the geometric matching doesn't work
    Part::TopoShape shape = this->Shape.getValue();
    TopoDS_Shape sh = shape.getShape();
    sh.Location(TopLoc_Location());
    shape.setShape(sh);

    std::vector<App::DocumentObject*> refs = this->getInList();
    for (std::vector<App::DocumentObject*>::iterator it = refs.begin(); it != refs.end(); ++it) {
        std::vector<App::Property*> props;
        (*it)->getPropertyList(props);
        for (std::vector<App::Property*>::iterator jt = props.begin(); jt != props.end(); ++jt) {
            if (!(*jt)->isDerivedFrom(App::PropertyLinkSub::getClassTypeId()))
                continue;
            App::PropertyLinkSub* link = static_cast<App::PropertyLinkSub*>(*jt);
            if (link->getValue() != this)
                continue;
            std::vector<std::string> subValues = link->getSubValues();
            std::vector<std::string> newSubValues;

            for (std::vector<std::string>::iterator it = subValues.begin(); it != subValues.end(); ++it) {
                std::string shapetype;
                if (it->size() > 4 && it->substr(0,4) == "Face") {
                    shapetype = "Face";
                }
                else if (it->size() > 4 && it->substr(0,4) == "Edge") {
                    shapetype = "Edge";
                }
                else if (it->size() > 6 && it->substr(0,6) == "Vertex") {
                    shapetype = "Vertex";
                }
                else {
                    newSubValues.push_back(*it);
                    continue;
                }

                bool success = false;
                TopoDS_Shape element;
                try {
                    element = shape.getSubShape(it->c_str());
                }
                catch (Standard_Failure) {
                    // This shape doesn't even exist, so no chance to do some tests
                    newSubValues.push_back(*it);
                    continue;
                }
                try {
                    // as very first test check if old face and new face are parallel planes
                    TopoDS_Shape newElement = Part::TopoShape(newShape).getSubShape(it->c_str());
                    if (isParallelPlane(element, newElement)) {
                        newSubValues.push_back(*it);
                        success = true;
                    }
                }
                catch (Standard_Failure) {
                }
                // try an exact matching
                if (!success) {
                    for (int i=1; i<faceMap.Extent(); i++) {
                        if (isQuasiEqual(element, faceMap.FindKey(i))) {
                            std::stringstream str;
                            str << shapetype << i;
                            newSubValues.push_back(str.str());
                            success = true;
                            break;
                        }
                    }
                }
                // if an exact matching fails then try to compare only the geometries
                if (!success) {
                    for (int i=1; i<faceMap.Extent(); i++) {
                        if (isEqualGeometry(element, faceMap.FindKey(i))) {
                            std::stringstream str;
                            str << shapetype << i;
                            newSubValues.push_back(str.str());
                            success = true;
                            break;
                        }
                    }
                }

                // the new shape couldn't be found so keep the old sub-name
                if (!success)
                    newSubValues.push_back(*it);
            }

            link->setValue(this, newSubValues);
        }
    }
}

namespace PartDesign {
struct gp_Pnt_Less  : public std::binary_function<const gp_Pnt&,
                                                  const gp_Pnt&, bool>
{
    bool operator()(const gp_Pnt& p1,
                    const gp_Pnt& p2) const
    {
        if (fabs(p1.X() - p2.X()) > Precision::Confusion())
            return p1.X() < p2.X();
        if (fabs(p1.Y() - p2.Y()) > Precision::Confusion())
            return p1.Y() < p2.Y();
        if (fabs(p1.Z() - p2.Z()) > Precision::Confusion())
            return p1.Z() < p2.Z();
        return false; // points are considered to be equal
    }
};
}

bool ProfileBased::isQuasiEqual(const TopoDS_Shape& s1, const TopoDS_Shape& s2) const
{
    if (s1.ShapeType() != s2.ShapeType())
        return false;
    TopTools_IndexedMapOfShape map1, map2;
    TopExp::MapShapes(s1, TopAbs_VERTEX, map1);
    TopExp::MapShapes(s2, TopAbs_VERTEX, map2);
    if (map1.Extent() != map2.Extent())
        return false;

    std::vector<gp_Pnt> p1;
    for (int i=1; i<=map1.Extent(); i++) {
        const TopoDS_Vertex& v = TopoDS::Vertex(map1.FindKey(i));
        p1.push_back(BRep_Tool::Pnt(v));
    }
    std::vector<gp_Pnt> p2;
    for (int i=1; i<=map2.Extent(); i++) {
        const TopoDS_Vertex& v = TopoDS::Vertex(map2.FindKey(i));
        p2.push_back(BRep_Tool::Pnt(v));
    }

    std::sort(p1.begin(), p1.end(), gp_Pnt_Less());
    std::sort(p2.begin(), p2.end(), gp_Pnt_Less());

    if (p1.size() != p2.size())
        return false;

    std::vector<gp_Pnt>::iterator it = p1.begin(), jt = p2.begin();
    for (; it != p1.end(); ++it, ++jt) {
        if (!(*it).IsEqual(*jt, Precision::Confusion()))
            return false;
    }

    return true;
}

bool ProfileBased::isEqualGeometry(const TopoDS_Shape& s1, const TopoDS_Shape& s2) const
{
    if (s1.ShapeType() == TopAbs_FACE && s2.ShapeType() == TopAbs_FACE) {
        BRepAdaptor_Surface a1(TopoDS::Face(s1));
        BRepAdaptor_Surface a2(TopoDS::Face(s2));
        if (a1.GetType() == GeomAbs_Plane && a2.GetType() == GeomAbs_Plane) {
            gp_Pln p1 = a1.Plane();
            gp_Pln p2 = a2.Plane();
            if (p1.Distance(p2.Location()) < Precision::Confusion()) {
                const gp_Dir& d1 = p1.Axis().Direction();
                const gp_Dir& d2 = p2.Axis().Direction();
                if (d1.IsParallel(d2, Precision::Confusion()))
                    return true;
            }
        }
    }
    else if (s1.ShapeType() == TopAbs_EDGE && s2.ShapeType() == TopAbs_EDGE) {
    }
    else if (s1.ShapeType() == TopAbs_VERTEX && s2.ShapeType() == TopAbs_VERTEX) {
        gp_Pnt p1 = BRep_Tool::Pnt(TopoDS::Vertex(s1));
        gp_Pnt p2 = BRep_Tool::Pnt(TopoDS::Vertex(s2));
        return p1.Distance(p2) < Precision::Confusion();
    }

    return false;
}

bool ProfileBased::isParallelPlane(const TopoDS_Shape& s1, const TopoDS_Shape& s2) const
{
    if (s1.ShapeType() == TopAbs_FACE && s2.ShapeType() == TopAbs_FACE) {
        BRepAdaptor_Surface a1(TopoDS::Face(s1));
        BRepAdaptor_Surface a2(TopoDS::Face(s2));
        if (a1.GetType() == GeomAbs_Plane && a2.GetType() == GeomAbs_Plane) {
            gp_Pln p1 = a1.Plane();
            gp_Pln p2 = a2.Plane();
            const gp_Dir& d1 = p1.Axis().Direction();
            const gp_Dir& d2 = p2.Axis().Direction();
            if (d1.IsParallel(d2, Precision::Confusion()))
                return true;
        }
    }

    return false;
}


const double ProfileBased::getReversedAngle(const Base::Vector3d &b, const Base::Vector3d &v)
{
    try {
        Part::Feature* obj = getVerifiedObject();
        TopoDS_Shape sketchshape = getVerifiedFace();

        // get centre of gravity of the sketch face
        GProp_GProps props;
        BRepGProp::SurfaceProperties(sketchshape, props);
        gp_Pnt cog = props.CentreOfMass();
        Base::Vector3d p_cog(cog.X(), cog.Y(), cog.Z());
        // get direction to cog from its projection on the revolve axis
        Base::Vector3d perp_dir = p_cog - p_cog.Perpendicular(b, v);
        // get cross product of projection direction with revolve axis direction
        Base::Vector3d cross = v % perp_dir;
        // get sketch vector pointing away from support material
        Base::Placement SketchPos = obj->Placement.getValue();
        Base::Rotation SketchOrientation = SketchPos.getRotation();
        Base::Vector3d SketchNormal(0,0,1);
        SketchOrientation.multVec(SketchNormal,SketchNormal);

        return SketchNormal * cross;
    }
    catch (...) {
        return Reversed.getValue();
    }
}

void ProfileBased::getAxis(const App::DocumentObject *pcReferenceAxis, const std::vector<std::string> &subReferenceAxis,
                          Base::Vector3d& base, Base::Vector3d& dir)
{
    dir = Base::Vector3d(0,0,0); // If unchanged signals that no valid axis was found
    if (pcReferenceAxis == NULL)
        return;

    Part::Part2DObject* sketch = getVerifiedSketch();
    Base::Placement SketchPlm = sketch->Placement.getValue();
    Base::Vector3d SketchPos = SketchPlm.getPosition();
    Base::Rotation SketchOrientation = SketchPlm.getRotation();
    Base::Vector3d SketchVector(0,0,1);
    SketchOrientation.multVec(SketchVector,SketchVector);
    gp_Pln sketchplane(gp_Pnt(SketchPos.x, SketchPos.y, SketchPos.z), gp_Dir(SketchVector.x, SketchVector.y, SketchVector.z));

    // get reference axis
    if (pcReferenceAxis->getTypeId().isDerivedFrom(PartDesign::Line::getClassTypeId())) {
        const PartDesign::Line* line = static_cast<const PartDesign::Line*>(pcReferenceAxis);
        base = line->getBasePoint();
        dir = line->getDirection();

        // Check that axis is perpendicular with sketch plane!
        if (sketchplane.Axis().Direction().Angle(gp_Dir(dir.x, dir.y, dir.z))< Precision::Angular())
             throw Base::Exception("Rotation axis must not be perpendicular with the sketch plane");
        return;
    }

    if (pcReferenceAxis->getTypeId().isDerivedFrom(App::Line::getClassTypeId())) {
        const App::Line* line = static_cast<const App::Line*>(pcReferenceAxis);
        base = Base::Vector3d(0,0,0);
        line->Placement.getValue().multVec (Base::Vector3d (1,0,0), dir);

        // Check that axis is perpendicular with sketch plane!
        if (sketchplane.Axis().Direction().Angle(gp_Dir(dir.x, dir.y, dir.z)) < Precision::Angular())
             throw Base::Exception("Rotation axis must not be perpendicular with the sketch plane");
        return;
    }

    if (pcReferenceAxis == sketch){
        bool hasValidAxis=false;
        Base::Axis axis;
        if (subReferenceAxis[0] == "V_Axis") {
            hasValidAxis = true;
            axis = sketch->getAxis(Part::Part2DObject::V_Axis);
        } else if (subReferenceAxis[0] == "H_Axis") {
            hasValidAxis = true;
            axis = sketch->getAxis(Part::Part2DObject::H_Axis);
        } else if (subReferenceAxis[0].size() > 4 && subReferenceAxis[0].substr(0,4) == "Axis") {
            int AxId = std::atoi(subReferenceAxis[0].substr(4,4000).c_str());
            if (AxId >= 0 && AxId < sketch->getAxisCount()) {
                hasValidAxis = true;
                axis = sketch->getAxis(AxId);
            }
        }
        if (hasValidAxis) {
            axis *= SketchPlm;
            base=axis.getBase();
            dir=axis.getDirection();
            return;
        } //else - an edge of the sketch was selected as an axis
    }

    if (pcReferenceAxis->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId())) {
        if (subReferenceAxis.empty())
            throw Base::Exception("No rotation axis reference specified");
        const Part::Feature* refFeature = static_cast<const Part::Feature*>(pcReferenceAxis);
        Part::TopoShape refShape = refFeature->Shape.getShape();
        TopoDS_Shape ref = refShape.getSubShape(subReferenceAxis[0].c_str());

        if (ref.ShapeType() == TopAbs_EDGE) {
            TopoDS_Edge refEdge = TopoDS::Edge(ref);
            if (refEdge.IsNull())
                throw Base::Exception("Failed to extract rotation edge");
            BRepAdaptor_Curve adapt(refEdge);
            if (adapt.GetType() != GeomAbs_Line)
                throw Base::Exception("Rotation edge must be a straight line");

            gp_Pnt b = adapt.Line().Location();
            base = Base::Vector3d(b.X(), b.Y(), b.Z());
            gp_Dir d = adapt.Line().Direction();
            dir = Base::Vector3d(d.X(), d.Y(), d.Z());
            // Check that axis is co-planar with sketch plane!
            // Check that axis is perpendicular with sketch plane!
            if (sketchplane.Axis().Direction().Angle(d) < Precision::Angular())
                throw Base::Exception("Rotation axis must not be perpendicular with the sketch plane");
            return;
        } else {
            throw Base::Exception("Rotation reference must be an edge");
        }
    }

    throw Base::Exception("Rotation axis reference is invalid");
}

TopoDS_Shape ProfileBased::refineShapeIfActive(const TopoDS_Shape& oldShape) const
{
    Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter()
        .GetGroup("BaseApp")->GetGroup("Preferences")->GetGroup("Mod/PartDesign");
    if (hGrp->GetBool("RefineModel", false)) {
        Part::BRepBuilderAPI_RefineModel mkRefine(oldShape);
        TopoDS_Shape resShape = mkRefine.Shape();
        return resShape;
    }

    return oldShape;
}

Base::Vector3d ProfileBased::getProfileNormal() const {

    Base::Vector3d SketchVector(0,0,1);
    auto obj = getVerifiedObject(true);
    if(!obj) 
        return SketchVector;

    // get the Sketch plane
    if(obj->isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
        Base::Placement SketchPos = obj->Placement.getValue();
        Base::Rotation SketchOrientation = SketchPos.getRotation();    
        SketchOrientation.multVec(SketchVector,SketchVector);
    }
    else {
        TopoDS_Shape shape = getVerifiedFace(true);
        if(shape.ShapeType() == TopAbs_FACE) {
            BRepAdaptor_Surface adapt(TopoDS::Face(shape));
            double u = adapt.FirstUParameter() + (adapt.LastUParameter() - adapt.FirstUParameter())/2.;
            double v = adapt.FirstVParameter() + (adapt.LastVParameter() - adapt.FirstVParameter())/2.;
            BRepLProp_SLProps prop(adapt,u,v,2,Precision::Confusion());
            if(prop.IsNormalDefined()) {
                gp_Pnt pnt; gp_Vec vec;
                // handles the orientation state of the shape
                BRepGProp_Face(TopoDS::Face(shape)).Normal(u,v,pnt,vec);
                SketchVector = Base::Vector3d(vec.X(), vec.Y(), vec.Z());
            }
        }
    }
    
    return SketchVector;
}


void ProfileBased::Restore(Base::XMLReader& reader) {
   
    reader.readElement("Properties");
    int Cnt = reader.getAttributeAsInteger("Count");

    for (int i=0 ;i<Cnt ;i++) {
        reader.readElement("Property");
        const char* PropName = reader.getAttribute("name");
        const char* TypeName = reader.getAttribute("type");
        App::Property* prop = getPropertyByName(PropName);
        // NOTE: We must also check the type of the current property because a
        // subclass of PropertyContainer might change the type of a property but
        // not its name. In this case we would force to read-in a wrong property
        // type and the behaviour would be undefined.
        try {
            //check if we load the old sketch property
            if(!prop && (strcmp("Sketch", PropName) == 0) && (strcmp("App::PropertyLink", TypeName) == 0)) {
                
                std::vector<std::string> vec;
                // read my element
                reader.readElement("Link");
                // get the value of my attribute
                std::string name = reader.getAttribute("value");

                if (name != "") {                    
                    App::Document* document = getDocument();
                    DocumentObject* object = document ? document->getObject(name.c_str()) : 0;
                    Profile.setValue(object, vec);
                }
                else {
                    Profile.setValue(0, vec);
                }
            }
            else if (prop && strcmp(prop->getTypeId().getName(), TypeName) == 0)
                prop->Restore(reader);
        }
        catch (const Base::XMLParseException&) {
            throw; // re-throw
        }
        catch (const Base::Exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        catch (const std::exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        catch (const char* e) {
            Base::Console().Error("%s\n", e);
        }

        reader.readEndElement("Property");
    }
    reader.readEndElement("Properties");
}