/*************************************************************************** * Copyright (c) 2010 Werner Mayer * * * * 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 # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include #endif #include "CrossSection.h" using namespace Part; CrossSection::CrossSection(double a, double b, double c, const TopoDS_Shape& s) : a(a), b(b), c(c), s(s) { } std::list CrossSection::slice(double d) const { std::list wires; // Fixes: 0001228: Cross section of Torus in Part Workbench fails or give wrong results // Fixes: 0001137: Incomplete slices when using Part.slice on a torus TopExp_Explorer xp; for (xp.Init(s, TopAbs_SOLID); xp.More(); xp.Next()) { sliceSolid(d, xp.Current(), wires); } for (xp.Init(s, TopAbs_SHELL, TopAbs_SOLID); xp.More(); xp.Next()) { sliceNonSolid(d, xp.Current(), wires); } for (xp.Init(s, TopAbs_FACE, TopAbs_SHELL); xp.More(); xp.Next()) { sliceNonSolid(d, xp.Current(), wires); } return wires; } void CrossSection::sliceNonSolid(double d, const TopoDS_Shape& shape, std::list& wires) const { BRepAlgoAPI_Section cs(shape, gp_Pln(a,b,c,-d)); if (cs.IsDone()) { std::list edges; TopExp_Explorer xp; for (xp.Init(cs.Shape(), TopAbs_EDGE); xp.More(); xp.Next()) edges.push_back(TopoDS::Edge(xp.Current())); connectEdges(edges, wires); } } void CrossSection::sliceSolid(double d, const TopoDS_Shape& shape, std::list& wires) const { #if 0 gp_Pln slicePlane(a,b,c,-d); BRepBuilderAPI_MakeFace mkFace(slicePlane); TopoDS_Face face = mkFace.Face(); BRepAlgoAPI_Common mkInt(shape, face); if (mkInt.IsDone()) { // sort and repair the wires TopTools_IndexedMapOfShape mapOfWires; TopExp::MapShapes(mkInt.Shape(), TopAbs_WIRE, mapOfWires); connectWires(mapOfWires, wires); } #else gp_Pln slicePlane(a,b,c,-d); BRepBuilderAPI_MakeFace mkFace(slicePlane); TopoDS_Face face = mkFace.Face(); // Make sure to choose a point that does not lie on the plane (fixes #0001228) gp_Vec tempVector(a,b,c); tempVector.Normalize();//just in case. tempVector *= (d+1.0); gp_Pnt refPoint(0.0, 0.0, 0.0); refPoint.Translate(tempVector); BRepPrimAPI_MakeHalfSpace mkSolid(face, refPoint); TopoDS_Solid solid = mkSolid.Solid(); BRepAlgoAPI_Cut mkCut(shape, solid); if (mkCut.IsDone()) { TopTools_IndexedMapOfShape mapOfFaces; TopExp::MapShapes(mkCut.Shape(), TopAbs_FACE, mapOfFaces); for (int i=1; i<=mapOfFaces.Extent(); i++) { const TopoDS_Face& face = TopoDS::Face(mapOfFaces.FindKey(i)); BRepAdaptor_Surface adapt(face); if (adapt.GetType() == GeomAbs_Plane) { gp_Pln plane = adapt.Plane(); if (plane.Axis().IsParallel(slicePlane.Axis(), Precision::Confusion()) && plane.Distance(slicePlane.Location()) < Precision::Confusion()) { // sort and repair the wires TopTools_IndexedMapOfShape mapOfWires; TopExp::MapShapes(face, TopAbs_WIRE, mapOfWires); connectWires(mapOfWires, wires); } } } } #endif } void CrossSection::connectEdges (const std::list& edges, std::list& wires) const { // FIXME: Use ShapeAnalysis_FreeBounds::ConnectEdgesToWires() as an alternative std::list edge_list = edges; while (edge_list.size() > 0) { BRepBuilderAPI_MakeWire mkWire; // add and erase first edge mkWire.Add(edge_list.front()); edge_list.erase(edge_list.begin()); TopoDS_Wire new_wire = mkWire.Wire(); // current new wire // try to connect each edge to the wire, the wire is complete if no more egdes are connectible bool found = false; do { found = false; for (std::list::iterator pE = edge_list.begin(); pE != edge_list.end();++pE) { mkWire.Add(*pE); if (mkWire.Error() != BRepBuilderAPI_DisconnectedWire) { // edge added ==> remove it from list found = true; edge_list.erase(pE); new_wire = mkWire.Wire(); break; } } } while (found); // Fix any topological issues of the wire ShapeFix_Wire aFix; aFix.SetPrecision(Precision::Confusion()); aFix.Load(new_wire); aFix.FixReorder(); aFix.FixConnected(); aFix.FixClosed(); wires.push_back(aFix.Wire()); } } void CrossSection::connectWires (const TopTools_IndexedMapOfShape& wireMap, std::list& wires) const { Handle(TopTools_HSequenceOfShape) hWires = new TopTools_HSequenceOfShape(); for (int i=1; i<=wireMap.Extent(); i++) { const TopoDS_Shape& wire = wireMap.FindKey(i); hWires->Append(wire); } Handle(TopTools_HSequenceOfShape) hSorted = new TopTools_HSequenceOfShape(); ShapeAnalysis_FreeBounds::ConnectWiresToWires(hWires, Precision::Confusion(), false, hSorted); for (int i=1; i<=hSorted->Length(); i++) { const TopoDS_Wire& new_wire = TopoDS::Wire(hSorted->Value(i)); // Fix any topological issues of the wire ShapeFix_Wire aFix; aFix.SetPrecision(Precision::Confusion()); aFix.Load(new_wire); aFix.FixReorder(); aFix.FixConnected(); aFix.FixClosed(); wires.push_back(aFix.Wire()); } }