221 lines
7.8 KiB
C++
221 lines
7.8 KiB
C++
/***************************************************************************
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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 <Bnd_Box.hxx>
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# include <gp_Pln.hxx>
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# include <BRep_Builder.hxx>
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# include <BRepBndLib.hxx>
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# include <BRepBuilderAPI_Copy.hxx>
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# include <BRepBuilderAPI_MakeFace.hxx>
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# include <BRepAdaptor_Surface.hxx>
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# include <Geom_Plane.hxx>
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# include <Geom_Surface.hxx>
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# include <TopoDS.hxx>
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# include <TopoDS_Compound.hxx>
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# include <TopoDS_Face.hxx>
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# include <TopoDS_Wire.hxx>
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# include <TopExp_Explorer.hxx>
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# include <BRepAlgoAPI_Fuse.hxx>
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# include <gp_Pln.hxx>
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#endif
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#include <Base/Placement.h>
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#include "FeatureFace.h"
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#include <Mod/Part/App/Part2DObject.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,(0));
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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 (Sources.isTouched())
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return 1;
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return Part::Feature::mustExecute();
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}
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App::DocumentObjectExecReturn *Face::execute(void)
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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::vector<TopoDS_Wire> wires;
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for (std::vector<App::DocumentObject*>::iterator it = links.begin(); it != links.end(); ++it) {
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if (!(*it && (*it)->isDerivedFrom(Part::Part2DObject::getClassTypeId())))
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return new App::DocumentObjectExecReturn("Linked object is not a Sketch or Part2DObject");
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TopoDS_Shape shape = static_cast<Part::Part2DObject*>(*it)->Shape.getShape()._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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// 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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TopExp_Explorer ex;
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for (ex.Init(shape, TopAbs_WIRE); ex.More(); ex.Next()) {
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wires.push_back(TopoDS::Wire(ex.Current()));
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}
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}
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if (wires.empty()) // there can be several wires
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return new App::DocumentObjectExecReturn("Linked shape object is not a wire");
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TopoDS_Shape aFace = makeFace(wires);
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if (aFace.IsNull())
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return new App::DocumentObjectExecReturn("Creating a face from sketch failed");
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this->Shape.setValue(aFace);
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return App::DocumentObject::StdReturn;
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}
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// sort bounding boxes according to diagonal length
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class Face::Wire_Compare {
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public:
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bool operator() (const TopoDS_Wire& w1, const TopoDS_Wire& w2)
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{
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Bnd_Box box1, box2;
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if (!w1.IsNull()) {
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BRepBndLib::Add(w1, box1);
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box1.SetGap(0.0);
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}
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if (!w2.IsNull()) {
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BRepBndLib::Add(w2, box2);
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box2.SetGap(0.0);
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}
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return box1.SquareExtent() < box2.SquareExtent();
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}
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};
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TopoDS_Shape Face::makeFace(std::list<TopoDS_Wire>& wires) const
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{
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BRepBuilderAPI_MakeFace mkFace(wires.front());
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const TopoDS_Face& face = mkFace.Face();
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if (face.IsNull())
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return face;
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gp_Dir axis(0,0,1);
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BRepAdaptor_Surface adapt(face);
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if (adapt.GetType() == GeomAbs_Plane) {
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axis = adapt.Plane().Axis().Direction();
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}
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wires.pop_front();
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for (std::list<TopoDS_Wire>::iterator it = wires.begin(); it != wires.end(); ++it) {
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BRepBuilderAPI_MakeFace mkInnerFace(*it);
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const TopoDS_Face& inner_face = mkInnerFace.Face();
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gp_Dir inner_axis(0,0,1);
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BRepAdaptor_Surface adapt(inner_face);
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if (adapt.GetType() == GeomAbs_Plane) {
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inner_axis = adapt.Plane().Axis().Direction();
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}
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// It seems that orientation is always 'Forward' and we only have to reverse
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// if the underlying plane have opposite normals.
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if (axis.Dot(inner_axis) < 0)
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it->Reverse();
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mkFace.Add(*it);
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}
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return mkFace.Face();
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}
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TopoDS_Shape Face::makeFace(const std::vector<TopoDS_Wire>& w) const
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{
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if (w.empty())
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return TopoDS_Shape();
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//FIXME: Need a safe method to sort wire that the outermost one comes last
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// Currently it's done with the diagonal lengths of the bounding boxes
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std::vector<TopoDS_Wire> wires = w;
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std::sort(wires.begin(), wires.end(), Wire_Compare());
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std::list<TopoDS_Wire> wire_list;
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wire_list.insert(wire_list.begin(), wires.rbegin(), wires.rend());
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// separate the wires into several independent faces
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std::list< std::list<TopoDS_Wire> > sep_wire_list;
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while (!wire_list.empty()) {
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std::list<TopoDS_Wire> sep_list;
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TopoDS_Wire wire = wire_list.front();
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wire_list.pop_front();
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sep_list.push_back(wire);
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Bnd_Box box;
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BRepBndLib::Add(wire, box);
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box.SetGap(0.0);
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std::list<TopoDS_Wire>::iterator it = wire_list.begin();
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while (it != wire_list.end()) {
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Bnd_Box box2;
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BRepBndLib::Add(*it, box2);
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box2.SetGap(0.0);
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if (!box.IsOut(box2)) {
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sep_list.push_back(*it);
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it = wire_list.erase(it);
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}
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else {
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++it;
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}
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}
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sep_wire_list.push_back(sep_list);
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}
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if (sep_wire_list.size() == 1) {
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std::list<TopoDS_Wire>& wires = sep_wire_list.front();
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return makeFace(wires);
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}
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else if (sep_wire_list.size() > 1) {
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TopoDS_Compound comp;
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BRep_Builder builder;
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builder.MakeCompound(comp);
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for (std::list< std::list<TopoDS_Wire> >::iterator it = sep_wire_list.begin(); it != sep_wire_list.end(); ++it) {
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TopoDS_Shape aFace = makeFace(*it);
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if (!aFace.IsNull())
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builder.Add(comp, aFace);
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}
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return comp;
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}
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else {
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return TopoDS_Shape(); // error
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}
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}
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