// SplitShape_Presentation.cpp: implementation of the SplitShape_Presentation class. // Split shape by wire ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "SplitShape_Presentation.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include // Initialization of global variable with an instance of this class OCCDemo_Presentation* OCCDemo_Presentation::Current = new SplitShape_Presentation; // Initialization of array of samples const SplitShape_Presentation::PSampleFuncType SplitShape_Presentation::SampleFuncs[] = { &SplitShape_Presentation::sample1, &SplitShape_Presentation::sample2 }; #ifdef WNT #define EOL "\r\n" #define DELIM "\\" #else #define EOL "\n" #define DELIM "/" #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// SplitShape_Presentation::SplitShape_Presentation() { myNbSamples = sizeof(SampleFuncs)/sizeof(PSampleFuncType); setName ("SplitShape"); } ////////////////////////////////////////////////////////////////////// // Sample execution ////////////////////////////////////////////////////////////////////// void SplitShape_Presentation::DoSample() { getAISContext()->EraseAll(); if (myIndex >=0 && myIndex < myNbSamples) (this->*SampleFuncs[myIndex])(); } ////////////////////////////////////////////////////////////////////// // Auxiliary functions ////////////////////////////////////////////////////////////////////// Standard_Boolean SplitShape_Presentation::readShell(TCollection_AsciiString& theText) { myShell.Nullify(); TCollection_AsciiString aPath; aPath = aPath + GetDataDir() + DELIM + "shell1.brep"; BRep_Builder aBld; Standard_Boolean isRead = BRepTools::Read (myShell, aPath.ToCString(), aBld); if (!isRead) { theText = aPath + " is not found"; setResultText(theText.ToCString()); } return isRead; } Standard_Boolean SplitShape_Presentation::computeSection (BRepAlgoAPI_Section& aSecAlgo, TopoDS_Wire& aSecWire, TCollection_AsciiString& aText) { aText += " aSecAlgo.Approximation(Standard_True); // approximate new geometries" EOL " aSecAlgo.ComputePCurveOn1(Standard_True); // pcurves must be computed on shell" EOL " aSecAlgo.Build();" EOL " if (!aSecAlgo.IsDone())" EOL " return;" EOL " TopoDS_Shape aSection = aSecAlgo.Shape(); // get compound of section edges" EOL EOL " // connect section edges to a wire" EOL " TopTools_ListOfShape aEdges;" EOL " TopExp_Explorer ex(aSection, TopAbs_EDGE);" EOL " if (!ex.More()) // is section empty?" EOL " return;" EOL " for (; ex.More(); ex.Next())" EOL " aEdges.Append(ex.Current());" EOL " BRepBuilderAPI_MakeWire aWMaker;" EOL " aWMaker.Add(aEdges);" EOL " if (!aWMaker.IsDone())" EOL " return;" EOL " TopoDS_Wire aSecWire = aWMaker.Wire();" EOL EOL; setResultText(aText.ToCString()); // define parameters and perform section aSecAlgo.Approximation(Standard_True); // approximate new geometries aSecAlgo.ComputePCurveOn1(Standard_True); // pcurves must be computed on shell aSecAlgo.Build(); if (!aSecAlgo.IsDone()) { aText += EOL "Error: section algo has failed" EOL; setResultText(aText.ToCString()); return Standard_False; } TopoDS_Shape aSection = aSecAlgo.Shape(); // get compound of section edges // connect section edges to a wire TopTools_ListOfShape aEdges; TopExp_Explorer ex(aSection, TopAbs_EDGE); if (!ex.More()) // is section empty? { aText += EOL "Error: no intersection found" EOL; setResultText(aText.ToCString()); return Standard_False; } for (; ex.More(); ex.Next()) aEdges.Append(ex.Current()); BRepBuilderAPI_MakeWire aWMaker; aWMaker.Add(aEdges); if (!aWMaker.IsDone()) { aText += EOL "Error: connecting of section edges has failed" EOL; setResultText(aText.ToCString()); return Standard_False; } aSecWire = aWMaker.Wire(); return Standard_True; } ///////////////////////////////////////////////////////////////////// Standard_Boolean SplitShape_Presentation::splitAndComposeLeft (const BRepAlgoAPI_Section& aSecAlgo, const TopoDS_Wire& aSecWire, TopoDS_Shell& aNewShell, TCollection_AsciiString& aText) { aText += " // initialize splitting algo with the shell" EOL " BRepFeat_SplitShape aSplitter(myShell);" EOL EOL " // add splitting edges" EOL " TopoDS_Iterator its(aSecWire);" EOL " for (; its.More(); its.Next())" EOL " {" EOL " const TopoDS_Edge& aEdge = TopoDS::Edge(its.Value());" EOL " // determine an ancestor face of this edge" EOL " TopoDS_Face aFace;" EOL " if (aSecAlgo.HasAncestorFaceOn1(aEdge, aFace))" EOL " aSplitter.Add (aEdge, aFace);" EOL " }" EOL EOL " // perform splitting" EOL " aSplitter.Build();" EOL " if (!aSplitter.IsDone())" EOL " return;" EOL EOL " // compose a new shell from the left side faces" EOL " TopoDS_Shell aNewShell;" EOL " aBld.MakeShell(aNewShell);" EOL " const TopTools_ListOfShape& aLF = aSplitter.Left();" EOL " TopTools_ListIteratorOfListOfShape it(aLF);" EOL " for (; it.More(); it.Next())" EOL " aBld.Add (aNewShell, it.Value());" EOL EOL; setResultText(aText.ToCString()); // initialize splitting algo with the shell BRepFeat_SplitShape aSplitter(myShell); // add splitting edges TopoDS_Iterator its(aSecWire); for (; its.More(); its.Next()) { const TopoDS_Edge& aEdge = TopoDS::Edge(its.Value()); // determine an ancestor face of this edge TopoDS_Face aFace; if (aSecAlgo.HasAncestorFaceOn1(aEdge, aFace)) aSplitter.Add (aEdge, aFace); } // perform splitting aSplitter.Build(); if (!aSplitter.IsDone()) { aText += EOL "Error: splitting algo has failed" EOL; setResultText(aText.ToCString()); return Standard_False; } // compose a new shell from the left side faces BRep_Builder aBld; aBld.MakeShell(aNewShell); const TopTools_ListOfShape& aLF = aSplitter.Left(); TopTools_ListIteratorOfListOfShape it(aLF); for (; it.More(); it.Next()) aBld.Add (aNewShell, it.Value()); return Standard_True; } ////////////////////////////////////////////////////////////////////// // Sample functions ////////////////////////////////////////////////////////////////////// void SplitShape_Presentation::sample1() { ResetView(); SetViewCenter(60.457558475728, -20.351205260916); SetViewScale(29.468160110195); setResultTitle ("Split shell by plane"); TCollection_AsciiString aText = " // define initial shell" EOL " TopoDS_Shell myShell;" EOL " // myShell = ...;" EOL EOL " // define secant plane" EOL " gp_Pln aPln(gp_Pnt(65,11,0), gp_Dir(1,-0.1,-0.3));" EOL EOL " // make section of myShell by the plane" EOL " Standard_Boolean performNow = Standard_False;" EOL " BRepAlgoAPI_Section aSecAlgo (myShell, aPln, performNow);" EOL ; setResultText(aText.ToCString()); // read shell if (myShell.IsNull() && !readShell(aText)) return; Handle(AIS_InteractiveObject) aIShell = drawShape (myShell); if (WAIT_A_SECOND) return; // define secant plane gp_Pln aPln(gp_Pnt(65,11,0), gp_Dir(1,-0.1,-0.3)); Handle(Geom_Surface) aPlane = new Geom_Plane(aPln); aPlane = new Geom_RectangularTrimmedSurface(aPlane,-5.,20.,-13.,13.); Handle(AIS_InteractiveObject) aIPlane = drawSurface(aPlane); if (WAIT_A_LITTLE) return; // make section of myShell by the plane TopoDS_Wire aSecWire; Standard_Boolean performNow = Standard_False; BRepAlgoAPI_Section aSecAlgo (myShell, aPln, performNow); if (!computeSection(aSecAlgo, aSecWire, aText)) return; getAISContext()->Erase(aIPlane); Handle(AIS_InteractiveObject) aISecWire = drawShape (aSecWire,Quantity_NOC_GREEN,Standard_False); Handle(Prs3d_LineAspect) aLA = new Prs3d_LineAspect(Quantity_NOC_GREEN,Aspect_TOL_SOLID,3.); aISecWire->Attributes()->SetWireAspect(aLA); getAISContext()->Display(aISecWire); if (WAIT_A_LITTLE) return; aText += " //aSecWire.Reverse(); // orient wire to have the left side as you need" EOL EOL; setResultText(aText.ToCString()); //aSecWire.Reverse(); // orient wire to have the left side as you need // split myShell by aSecWire and compose the left side subshell TopoDS_Shell aNewShell; if (!splitAndComposeLeft(aSecAlgo, aSecWire, aNewShell, aText)) return; drawShape (aNewShell); getAISContext()->Erase(aIShell); getAISContext()->Erase(aISecWire); } ///////////////////////////////////////////////////////////////////// void SplitShape_Presentation::sample2() { setResultTitle ("Cut hole from shell"); TCollection_AsciiString aText = " // define initial shell" EOL " TopoDS_Shell myShell;" EOL " // myShell = ...;" EOL EOL " // define contour of the hole and its normal direction" EOL " TopoDS_Wire aCont;" EOL " gp_Dir aNormal(-0.2, -0.7, 0.4);" EOL " // aCont = ... ;" EOL EOL " // project the contour on the shell along aNormal;" EOL " // for that create prism from the contour" EOL " // and find intersection with the shell" EOL " Standard_Real dist = 8;" EOL " gp_Vec aPrismVec(aNormal.Reversed().XYZ()*dist*2);" EOL " BRepPrimAPI_MakePrism aSweeper(aCont,aPrismVec);" EOL " if (!aSweeper.IsDone())" EOL " return;" EOL " TopoDS_Shape aPrism = aSweeper.Shape();" EOL EOL " // make section of myShell by the prism" EOL " TopoDS_Wire aSecWire;" EOL " Standard_Boolean performNow = Standard_False;" EOL " BRepAlgoAPI_Section aSecAlgo (myShell, aPrism, performNow);" EOL ; setResultText(aText.ToCString()); // read shell if (myShell.IsNull() && !readShell(aText)) return; Handle(AIS_InteractiveObject) aIShell = drawShape (myShell); if (WAIT_A_SECOND) return; // define contour of the hole and its normal direction TopoDS_Wire aCont; gp_Dir aNormal(-0.2, -0.7, 0.4); Standard_Real dx=2, dy=1.5, aOffValue=1.5; TopoDS_Wire aPol = BRepBuilderAPI_MakePolygon(gp_Pnt(-dx,-dy,0), gp_Pnt(dx,-dy,0), gp_Pnt(dx,dy,0), gp_Pnt(-dx,dy,0), Standard_True); // transform contour to a needed location gp_Pnt aOrigin(78,16,10); gp_Dir aXDir(1, 0, 0); gp_Ax2 aSystem(aOrigin, aNormal, aXDir); gp_Trsf aTrsf; aTrsf.SetDisplacement(gp::XOY(), aSystem); aPol.Location(TopLoc_Location(aTrsf)); BRepOffsetAPI_MakeOffset aOffAlgo (aPol, GeomAbs_Arc); aOffAlgo.Perform (aOffValue); aCont = TopoDS::Wire(aOffAlgo.Shape()); Handle(AIS_InteractiveObject) aICont = drawShape (aCont); if (WAIT_A_SECOND) return; // project the contour on the shell along aNormal; // for that create prism from the contour // and find intersection with the shell Standard_Real dist = 8; gp_Vec aPrismVec(aNormal.Reversed().XYZ()*dist); BRepPrimAPI_MakePrism aSweeper(aCont,aPrismVec); if (!aSweeper.IsDone()) { aText += EOL "Error: sweeping algo has failed" EOL; setResultText(aText.ToCString()); return; } TopoDS_Shape aPrism = aSweeper.Shape(); Handle(AIS_InteractiveObject) aIPrism = drawShape(aPrism, Quantity_NOC_LEMONCHIFFON3); if (WAIT_A_LITTLE) return; // make section of myShell by the prism TopoDS_Wire aSecWire; Standard_Boolean performNow = Standard_False; BRepAlgoAPI_Section aSecAlgo (myShell, aPrism, performNow); if (!computeSection(aSecAlgo, aSecWire, aText)) return; aText += " aSecWire.Reverse(); // orient wire to have the left side as you need" EOL EOL; setResultText(aText.ToCString()); //aSecWire.Reverse(); // orient wire to have the left side as you need // get an edge from the initial contour and // determine the corresponding projection edge from the section wire; // check orientations of their first derivatives TopoDS_Shape aEdgeP, aEdge1, aFace, aEdge2; TopoDS_Iterator it(aPol); aEdgeP = it.Value(); aEdge1 = aOffAlgo.Generated(aEdgeP).First(); aFace = aSweeper.Generated(aEdge1).First(); for (it.Initialize(aSecWire); it.More() && aEdge2.IsNull(); it.Next()) { TopoDS_Shape aF; if (aSecAlgo.HasAncestorFaceOn2(it.Value(),aF) && aF.IsSame(aFace)) aEdge2 = it.Value(); } if (aEdge2.IsNull()) { aText += EOL "Error: cannot orient projected contour due to" EOL "failure restoring history of modification" EOL; setResultText(aText.ToCString()); return; } BRepAdaptor_Curve aC1(TopoDS::Edge(aEdge1)), aC2(TopoDS::Edge(aEdge2)); gp_Pnt p1, p2; gp_Vec v1, v2; aC1.D1(aC1.FirstParameter(), p1, v1); aC2.D1(aC2.FirstParameter(), p2, v2); if (aEdge1.Orientation() == TopAbs_REVERSED) v1.Reverse(); if (aEdge2.Orientation() == TopAbs_REVERSED) v2.Reverse(); Standard_Real pr = v1 * v2; if (pr > 0.) aSecWire.Reverse(); getAISContext()->Erase(aIPrism); Handle(AIS_InteractiveObject) aISecWire = drawShape (aSecWire,Quantity_NOC_GREEN,Standard_False); Handle(Prs3d_LineAspect) aLA = new Prs3d_LineAspect(Quantity_NOC_GREEN,Aspect_TOL_SOLID,3.); aISecWire->Attributes()->SetWireAspect(aLA); getAISContext()->Display(aISecWire); if (WAIT_A_SECOND) return; // split myShell by aSecWire and compose the left side subshell TopoDS_Shell aNewShell; if (!splitAndComposeLeft(aSecAlgo, aSecWire, aNewShell, aText)) return; drawShape (aNewShell); getAISContext()->Erase(aIShell); getAISContext()->Erase(aISecWire); }