342 lines
12 KiB
C++
342 lines
12 KiB
C++
/***************************************************************************
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* Copyright (c) 2010 Juergen Riegel <FreeCAD@juergen-riegel.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 <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 <BRepCheck_Analyzer.hxx>
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# include <BRep_Tool.hxx>
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# include <Geom_Plane.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 <TopoDS_Vertex.hxx>
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# include <TopExp_Explorer.hxx>
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# include <gp_Pln.hxx>
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# include <ShapeFix_Face.hxx>
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# include <ShapeFix_Wire.hxx>
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# include <ShapeAnalysis.hxx>
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# include <TopTools_IndexedMapOfShape.hxx>
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# include <IntTools_FClass2d.hxx>
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# include <ShapeAnalysis_Surface.hxx>
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# include <ShapeFix_Shape.hxx>
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#endif
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#include "FeatureSketchBased.h"
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#include <Mod/Part/App/Part2DObject.h>
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using namespace PartDesign;
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namespace PartDesign {
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// sort bounding boxes according to diagonal length
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struct Wire_Compare {
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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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BRepBndLib::Add(w1, box1);
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box1.SetGap(0.0);
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BRepBndLib::Add(w2, box2);
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box2.SetGap(0.0);
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return box1.SquareExtent() < box2.SquareExtent();
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}
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};
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PROPERTY_SOURCE(PartDesign::SketchBased, PartDesign::Feature)
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SketchBased::SketchBased()
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{
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ADD_PROPERTY(Sketch,(0));
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ADD_PROPERTY_TYPE(Midplane,(0),"SketchBased", App::Prop_None, "Extrude symmetric to sketch face");
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ADD_PROPERTY_TYPE(Reversed, (0),"SketchBased", App::Prop_None, "Reverse extrusion direction");
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}
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short SketchBased::mustExecute() const
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{
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if (Sketch.isTouched() ||
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Midplane.isTouched() ||
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Reversed.isTouched())
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return 1;
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return 0; // PartDesign::Feature::mustExecute();
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}
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void SketchBased::positionBySketch(void)
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{
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Part::Part2DObject *sketch = static_cast<Part::Part2DObject*>(Sketch.getValue());
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if (sketch && sketch->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
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Part::Feature *part = static_cast<Part::Feature*>(sketch->Support.getValue());
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if (part && part->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
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this->Placement.setValue(part->Placement.getValue());
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else
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this->Placement.setValue(sketch->Placement.getValue());
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}
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}
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Part::Part2DObject* SketchBased::getVerifiedSketch() const {
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App::DocumentObject* result = Sketch.getValue();
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if (!result)
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throw Base::Exception("No sketch linked");
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if (!result->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId()))
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throw Base::Exception("Linked object is not a Sketch or Part2DObject");
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return static_cast<Part::Part2DObject*>(result);
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}
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std::vector<TopoDS_Wire> SketchBased::getSketchWires() const {
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std::vector<TopoDS_Wire> result;
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TopoDS_Shape shape = getVerifiedSketch()->Shape.getShape()._Shape;
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if (shape.IsNull())
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throw Base::Exception("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 almost happens when re-computing the shape but sometimes also for the
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// first time
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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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throw Base::Exception("Linked shape object is empty");
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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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result.push_back(TopoDS::Wire(ex.Current()));
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}
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if (result.empty()) // there can be several wires
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throw Base::Exception("Linked shape object is not a wire");
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return result;
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}
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const TopoDS_Shape& SketchBased::getSupportShape() const {
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// get the support of the Sketch if any
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App::DocumentObject* SupportLink = static_cast<Part::Part2DObject*>(Sketch.getValue())->Support.getValue();
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Part::Feature* SupportObject = NULL;
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if (SupportLink && SupportLink->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
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SupportObject = static_cast<Part::Feature*>(SupportLink);
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if (SupportObject == NULL)
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throw Base::Exception("No support in Sketch!");
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const TopoDS_Shape& result = SupportObject->Shape.getValue();
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if (result.IsNull())
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throw Base::Exception("Support shape is invalid");
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TopExp_Explorer xp (result, TopAbs_SOLID);
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if (!xp.More())
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throw Base::Exception("Support shape is not a solid");
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return result;
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}
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void SketchBased::onChanged(const App::Property* prop)
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{
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if (prop == &Sketch) {
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// if attached to a sketch then mark it as read-only
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this->Placement.StatusBits.set(2, Sketch.getValue() != 0);
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}
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Feature::onChanged(prop);
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}
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bool SketchBased::isInside(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2) const
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{
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Bnd_Box box1;
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BRepBndLib::Add(wire1, box1);
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box1.SetGap(0.0);
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Bnd_Box box2;
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BRepBndLib::Add(wire2, box2);
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box2.SetGap(0.0);
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if (box1.IsOut(box2))
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return false;
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double prec = Precision::Confusion();
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BRepBuilderAPI_MakeFace mkFace(wire1);
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TopoDS_Face face = validateFace(mkFace.Face());
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BRepAdaptor_Surface adapt(face);
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IntTools_FClass2d class2d(face, prec);
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Handle_Geom_Surface surf = new Geom_Plane(adapt.Plane());
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ShapeAnalysis_Surface as(surf);
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TopExp_Explorer xp(wire2,TopAbs_VERTEX);
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while (xp.More()) {
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TopoDS_Vertex v = TopoDS::Vertex(xp.Current());
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gp_Pnt p = BRep_Tool::Pnt(v);
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gp_Pnt2d uv = as.ValueOfUV(p, prec);
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if (class2d.Perform(uv) == TopAbs_IN)
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return true;
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// TODO: We can make a check to see if all points are inside or all outside
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// because otherwise we have some intersections which is not allowed
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else
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return false;
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xp.Next();
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}
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return false;
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}
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TopoDS_Face SketchBased::validateFace(const TopoDS_Face& face) const
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{
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BRepCheck_Analyzer aChecker(face);
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if (!aChecker.IsValid()) {
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TopoDS_Wire outerwire = ShapeAnalysis::OuterWire(face);
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TopTools_IndexedMapOfShape myMap;
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myMap.Add(outerwire);
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TopExp_Explorer xp(face,TopAbs_WIRE);
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ShapeFix_Wire fix;
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fix.SetFace(face);
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fix.Load(outerwire);
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fix.Perform();
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BRepBuilderAPI_MakeFace mkFace(fix.WireAPIMake());
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while (xp.More()) {
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if (!myMap.Contains(xp.Current())) {
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fix.Load(TopoDS::Wire(xp.Current()));
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fix.Perform();
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mkFace.Add(fix.WireAPIMake());
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}
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xp.Next();
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}
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aChecker.Init(mkFace.Face());
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if (!aChecker.IsValid()) {
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ShapeFix_Shape fix(mkFace.Face());
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fix.SetPrecision(Precision::Confusion());
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fix.SetMaxTolerance(Precision::Confusion());
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fix.SetMaxTolerance(Precision::Confusion());
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fix.Perform();
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fix.FixWireTool()->Perform();
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fix.FixFaceTool()->Perform();
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return TopoDS::Face(fix.Shape());
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}
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return mkFace.Face();
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}
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return face;
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}
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TopoDS_Shape SketchBased::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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if (inner_face.IsNull())
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return inner_face; // failure
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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 validateFace(mkFace.Face());
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}
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TopoDS_Shape SketchBased::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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std::list<TopoDS_Wire>::iterator it = wire_list.begin();
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while (it != wire_list.end()) {
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if (isInside(wire, *it)) {
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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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int SketchBased::getSketchAxisCount(void) const
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{
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Part::Part2DObject *sketch = static_cast<Part::Part2DObject*>(Sketch.getValue());
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return sketch->getAxisCount();
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}
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}
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