FreeCAD

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/***************************************************************************
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 *   Copyright (c) 2011 Werner Mayer <wmayer[at]users.sourceforge.net>     *
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 *                                                                         *
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 *   This file is part of the FreeCAD CAx development system.              *
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 *                                                                         *
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 *   This library is free software; you can redistribute it and/or         *
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 *   modify it under the terms of the GNU Library General Public           *
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 *   License as published by the Free Software Foundation; either          *
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 *   version 2 of the License, or (at your option) any later version.      *
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 *                                                                         *
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 *   This library  is distributed in the hope that it will be useful,      *
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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 *   GNU Library General Public License for more details.                  *
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 *                                                                         *
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 *   You should have received a copy of the GNU Library General Public     *
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 *   License along with this library; see the file COPYING.LIB. If not,    *
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 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
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 *   Suite 330, Boston, MA  02111-1307, USA                                *
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 *                                                                         *
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 ***************************************************************************/
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#include "PreCompiled.h"
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#ifndef _PreComp_
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# include <BRepBuilderAPI_Copy.hxx>
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# include <TopoDS.hxx>
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#endif
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#include "FeatureFace.h"
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#include "FaceMaker.h"
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using namespace Part;
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PROPERTY_SOURCE(Part::Face, Part::Feature)
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Face::Face()
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{
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    ADD_PROPERTY(Sources,(nullptr));
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    ADD_PROPERTY(FaceMakerClass,("Part::FaceMakerCheese"));//default value here is for legacy documents. Default for new objects is set in setupObject.
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    Sources.setSize(0);
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}
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short Face::mustExecute() const
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{
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    if (FaceMakerClass.isTouched())
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        return 1;
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    if (Sources.isTouched())
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        return 1;
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    return Part::Feature::mustExecute();
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}
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void Face::setupObject()
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{
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    this->FaceMakerClass.setValue("Part::FaceMakerBullseye");
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    Feature::setupObject();
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}
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App::DocumentObjectExecReturn *Face::execute()
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{
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    std::vector<App::DocumentObject*> links = Sources.getValues();
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    if (links.empty())
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        return new App::DocumentObjectExecReturn("No shapes linked");
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    std::unique_ptr<FaceMaker> facemaker = FaceMaker::ConstructFromType(this->FaceMakerClass.getValue());
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    for (std::vector<App::DocumentObject*>::iterator it = links.begin(); it != links.end(); ++it) {
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        if (!(*it))
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            return new App::DocumentObjectExecReturn("Linked object is not a Part object (has no Shape).");
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        TopoDS_Shape shape = Feature::getShape(*it);
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        if (shape.IsNull())
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            return new App::DocumentObjectExecReturn("Linked shape object is empty");
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        // this is a workaround for an obscure OCC bug which leads to empty tessellations
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        // for some faces. Making an explicit copy of the linked shape seems to fix it.
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        // The error only happens when re-computing the shape.
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        /*if (!this->Shape.getValue().IsNull()) {
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            BRepBuilderAPI_Copy copy(shape);
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            shape = copy.Shape();
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            if (shape.IsNull())
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                return new App::DocumentObjectExecReturn("Linked shape object is empty");
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        }*/
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        if(links.size() == 1 && shape.ShapeType() == TopAbs_COMPOUND)
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            facemaker->useCompound(TopoDS::Compound(shape));
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        else
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            facemaker->addShape(shape);
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    }
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    facemaker->Build();
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    TopoDS_Shape aFace = facemaker->Shape();
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    if (aFace.IsNull())
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        return new App::DocumentObjectExecReturn("Creating face failed (null shape result)");
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    this->Shape.setValue(aFace);
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    return App::DocumentObject::StdReturn;
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}
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