0026775: Bad result of section algorithm

Walking line method extraction into separate class IntTools_WLineTool.
New purging method of walking line had been added. Now point which are out of bounds are deleted.

Minor corrections.

Test case for issue CR26775

src/IntTools/FILES

@@ -85,3 +85,5 @@ IntTools_Tools.cxx
 IntTools_Tools.hxx
 IntTools_TopolTool.cxx
 IntTools_TopolTool.hxx
+IntTools_WLineTool.hxx
+IntTools_WLineTool.cxx

src/IntTools/IntTools_WLineTool.hxx

@@ -0,0 +1,81 @@
+// Copyright (c) 1999-2014 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 _IntTools_WLineTool_HeaderFile
+#define _IntTools_WLineTool_HeaderFile
+
+#include <Standard_Boolean.hxx>
+#include <Standard_Macro.hxx>
+#include <IntPatch_WLine.hxx>
+#include <IntPatch_SequenceOfLine.hxx>
+class TopoDS_Face;
+class GeomAdaptor_HSurface;
+class GeomInt_LineConstructor;
+class IntTools_Context;
+class Adaptor3d_TopolTool;
+
+//! IntTools_WLineTool provides set of static methods related to walking lines.
+class IntTools_WLineTool
+{
+public:
+
+  DEFINE_STANDARD_ALLOC
+
+  Standard_EXPORT static
+    Standard_Boolean NotUseSurfacesForApprox(const TopoDS_Face& aF1,
+                                             const TopoDS_Face& aF2,
+                                             const Handle(IntPatch_WLine)& WL,
+                                             const Standard_Integer ifprm,
+                                             const Standard_Integer ilprm);
+
+  //! I
+  //! Removes equal points (leave one of equal points) from theWLine
+  //! and recompute vertex parameters.
+  //!
+  //! II
+  //! Removes point out of borders in case of non periodic surfaces.
+  //!
+  //! III
+  //! Removes exceed points using tube criteria:
+  //! delete 7D point if it lies near to expected lines in 2d and 3d.
+  //! Each task (2d, 2d, 3d) have its own tolerance and checked separately.
+  //!
+  //! Returns new WLine or null WLine if the number
+  //! of the points is less than 2.
+  Standard_EXPORT static
+    Handle(IntPatch_WLine) ComputePurgedWLine(const Handle(IntPatch_WLine)       &theWLine,
+                                              const Handle(GeomAdaptor_HSurface) &theS1,
+                                              const Handle(GeomAdaptor_HSurface) &theS2,
+                                              const Handle(Adaptor3d_TopolTool)  &theDom1,
+                                              const Handle(Adaptor3d_TopolTool)  &theDom2);
+
+  Standard_EXPORT static
+  Handle(Geom2d_BSplineCurve) MakeBSpline2d(const Handle(IntPatch_WLine) &theWLine,
+                                            const Standard_Integer       ideb,
+                                            const Standard_Integer       ifin,
+                                            const Standard_Boolean       onFirst);
+
+  Standard_EXPORT static
+  Standard_Boolean DecompositionOfWLine(const Handle(IntPatch_WLine)& theWLine,
+                                        const Handle(GeomAdaptor_HSurface)&            theSurface1, 
+                                        const Handle(GeomAdaptor_HSurface)&            theSurface2,
+                                        const TopoDS_Face&                             theFace1,
+                                        const TopoDS_Face&                             theFace2,
+                                        const GeomInt_LineConstructor&                 theLConstructor,
+                                        const Standard_Boolean                         theAvoidLConstructor,
+                                        IntPatch_SequenceOfLine&                       theNewLines,
+                                        Standard_Real&                                 theReachedTol3d,
+                                        const Handle(IntTools_Context)& );
+};
+
+#endif