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