0026180: Modeling Algorithms - Provide shape self-intersection detector

Small correction of test case for issue CR26180

Fix GCC compilation warnings.

src/BRepExtrema/BRepExtrema_SelfIntersection.hxx

@@ -0,0 +1,134 @@
+// Created on: 2015-04-26
+// Created by: Denis BOGOLEPOV
+// Copyright (c) 2015 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepExtrema_SelfIntersection_HeaderFile
+#define _BRepExtrema_SelfIntersection_HeaderFile
+
+#include <BRepExtrema_OverlapTool.hxx>
+
+//! Tool class for detection of self-sections in the given shape.
+//! This class is based on BRepExtrema_OverlapTool and thus uses
+//! shape tessellation to detect incorrect mesh fragments (pairs
+//! of overlapped triangles belonging to different faces). Thus,
+//! a result depends critically on the quality of mesh generator
+//! (e.g., BREP mesh is not always a good choice, because it can
+//! contain gaps between adjacent face triangulations, which may
+//! not share vertices on common edge; thus false overlap can be
+//! detected). As a result, this tool can be used for relatively
+//! fast approximated test which provides sub-set of potentially
+//! overlapped faces.
+class BRepExtrema_SelfIntersection : public BRepExtrema_ElementFilter
+{
+  friend class BRepExtrema_OverlapTool;
+
+public:
+
+  //! Creates unitialized self-intersection tool.
+  Standard_EXPORT BRepExtrema_SelfIntersection (const Standard_Real theTolerance = 0.0);
+
+  //! Creates self-intersection tool for the given shape.
+  Standard_EXPORT BRepExtrema_SelfIntersection (const TopoDS_Shape& theShape, const Standard_Real theTolerance = 0.0);
+
+public:
+
+  //! Returns tolerance value used for self-intersection test.
+  Standard_Real Tolerance() const
+  {
+    return myTolerance;
+  }
+
+  //! Sets tolerance value used for self-intersection test.
+  void SetTolerance (const Standard_Real theTolerance)
+  {
+    myTolerance = theTolerance;
+  }
+
+  //! Loads shape for detection of self-intersections.
+  Standard_EXPORT Standard_Boolean LoadShape (const TopoDS_Shape& theShape);
+
+  //! Performs detection of self-intersections.
+  Standard_EXPORT void Perform();
+
+  //! True if the detection is completed.
+  Standard_Boolean IsDone() const
+  { 
+    return myOverlapTool.IsDone();
+  }
+
+  //! Returns set of IDs of overlapped sub-shapes (started from 0).
+  const BRepExtrema_MapOfIntegerPackedMapOfInteger& OverlapElements() const
+  {
+    return myOverlapTool.OverlapSubShapes1();
+  }
+
+  //! Returns sub-shape from the shape for the given index (started from 0).
+  const TopoDS_Face& GetSubShape (const Standard_Integer theID) const
+  {
+    return myFaceList.Value (theID);
+  }
+
+  //! Returns set of all the face triangles of the shape.
+  const Handle(BRepExtrema_TriangleSet)& ElementSet() const
+  {
+    return myElementSet;
+  }
+
+#ifdef OVERLAP_TOOL_OUTPUT_TRIANGLES
+  //! Returns set of overlapped mesh elements (only triangles).
+  const TColStd_PackedMapOfInteger& OverlapTriangles() const
+  {
+    return myOverlapTool.OverlapTriangles1();
+  }
+#endif
+
+protected:
+
+  //! Filter out correct adjacent mesh elements.
+  virtual BRepExtrema_ElementFilter::FilterResult PreCheckElements (const Standard_Integer theIndex1,
+                                                                    const Standard_Integer theIndex2);
+
+  //! Checks if the given triangles have only single common vertex.
+  BRepExtrema_ElementFilter::FilterResult isRegularSharedVertex (const BVH_Vec3d& theSharedVert,
+                                                                 const BVH_Vec3d& theTrng1Vtxs1,
+                                                                 const BVH_Vec3d& theTrng1Vtxs2,
+                                                                 const BVH_Vec3d& theTrng2Vtxs1,
+                                                                 const BVH_Vec3d& theTrng2Vtxs2);
+
+  //! Checks if the given triangles have only single common edge.
+  BRepExtrema_ElementFilter::FilterResult isRegularSharedEdge (const BVH_Vec3d& theTrng1Vtxs0,
+                                                               const BVH_Vec3d& theTrng1Vtxs1,
+                                                               const BVH_Vec3d& theTrng1Vtxs2,
+                                                               const BVH_Vec3d& theTrng2Vtxs2);
+
+private:
+
+  //! Self-intersection tolerance.
+  Standard_Real myTolerance;
+
+  //! Is the input shape inited?
+  Standard_Boolean myIsInit;
+
+  //! List of triangulated faces of the shape.
+  BRepExtrema_ShapeList myFaceList;
+
+  //! Set of all the face triangles of the shape.
+  Handle(BRepExtrema_TriangleSet) myElementSet;
+
+  //! Overlap tool used for self-intersection test.
+  BRepExtrema_OverlapTool myOverlapTool;
+
+};
+
+#endif // _BRepExtrema_SelfIntersection_HeaderFile