1 // Created on: 2008-05-26
2 // Created by: Ekaterina SMIRNOVA
3 // Copyright (c) 2008-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef BRepMesh_CircleInspector_Header
17 #define BRepMesh_CircleInspector_Header
19 #include <IMeshData_Types.hxx>
20 #include <BRepMesh_Circle.hxx>
21 #include <Precision.hxx>
24 #include <NCollection_CellFilter.hxx>
26 //! Auxilary class to find circles shot by the given point.
27 class BRepMesh_CircleInspector : public NCollection_CellFilter_InspectorXY
30 typedef Standard_Integer Target;
33 //! @param theTolerance tolerance to be used for identification of shot circles.
34 //! @param theReservedSize size to be reserved for vector of circles.
35 //! @param theAllocator memory allocator to be used by internal collections.
36 BRepMesh_CircleInspector(
37 const Standard_Real theTolerance,
38 const Standard_Integer theReservedSize,
39 const Handle(NCollection_IncAllocator)& theAllocator)
40 : mySqTolerance(theTolerance*theTolerance),
41 myResIndices(theAllocator),
42 myCircles(theReservedSize, theAllocator)
46 //! Adds the circle to vector of circles at the given position.
47 //! @param theIndex position of circle in the vector.
48 //! @param theCircle circle to be added.
49 inline void Bind(const Standard_Integer theIndex,
50 const BRepMesh_Circle& theCircle)
52 myCircles.SetValue(theIndex, theCircle);
55 //! Resutns vector of registered circles.
56 inline const IMeshData::VectorOfCircle& Circles() const
61 //! Returns circle with the given index.
62 //! @param theIndex index of circle.
63 //! @return circle with the given index.
64 inline BRepMesh_Circle& Circle(const Standard_Integer theIndex)
66 return myCircles(theIndex);
69 //! Set reference point to be checked.
70 //! @param thePoint bullet point.
71 inline void SetPoint(const gp_XY& thePoint)
77 //! Returns list of circles shot by the reference point.
78 inline IMeshData::ListOfInteger& GetShotCircles()
83 //! Performs inspection of a circle with the given index.
84 //! @param theTargetIndex index of a circle to be checked.
85 //! @return status of the check.
86 inline NCollection_CellFilter_Action Inspect(
87 const Standard_Integer theTargetIndex)
89 BRepMesh_Circle& aCircle = myCircles(theTargetIndex);
90 const Standard_Real& aRadius = aCircle.Radius();
92 return CellFilter_Purge;
94 gp_XY& aLoc = const_cast<gp_XY&>(aCircle.Location());
96 const Standard_Real aDX = myPoint.ChangeCoord(1) - aLoc.ChangeCoord(1);
97 const Standard_Real aDY = myPoint.ChangeCoord(2) - aLoc.ChangeCoord(2);
99 //This check is wrong. It is better to use
101 // const Standard_Real aR = aRadius + aToler;
102 // if ((aDX * aDX + aDY * aDY) <= aR * aR)
107 //where aToler = sqrt(mySqTolerance). Taking into account the fact
108 //that the input parameter of the class (see constructor) is linear
109 //(not quadratic) tolerance there is no point in square root computation.
110 //Simply, we do not need to compute square of the input tolerance and to
111 //assign it to mySqTolerance. The input linear tolerance is needed to be used.
113 //However, this change leads to hangs the test case "perf mesh bug27119".
114 //So, this correction is better to be implemented in the future.
116 if ((aDX * aDX + aDY * aDY) - (aRadius * aRadius) <= mySqTolerance)
117 myResIndices.Append(theTargetIndex);
119 return CellFilter_Keep;
122 //! Checks indices for equlity.
123 static Standard_Boolean IsEqual(
124 const Standard_Integer theIndex,
125 const Standard_Integer theTargetIndex)
127 return (theIndex == theTargetIndex);
131 Standard_Real mySqTolerance;
132 IMeshData::ListOfInteger myResIndices;
133 IMeshData::VectorOfCircle myCircles;