EIC code displayed by LXR master/​include/​opencascade/​BRepMesh_GeomTool.hxx	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2025-01-18 10:03:14

 // Copyright (c) 2013 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 _BRepMesh_GeomTool_HeaderFile
 #define _BRepMesh_GeomTool_HeaderFile
 
 #include <BRepAdaptor_Surface.hxx>
 #include <GCPnts_TangentialDeflection.hxx>
 #include <GeomAbs_IsoType.hxx>
 #include <TopoDS_Edge.hxx>
 #include <Precision.hxx>
 
 class BRepAdaptor_Curve;
 class gp_Pnt2d;
 class BRepMesh_DefaultRangeSplitter;
 
 //! Tool class accumulating common geometrical functions as well as 
 //! functionality using shape geometry to produce data necessary for 
 //! tessellation.
 //! General aim is to calculate discretization points for the given
 //! curve or iso curve of surface according to the specified parameters.
 class BRepMesh_GeomTool
 {
 public:
 
   //! Enumerates states of segments intersection check.
   enum IntFlag
   {
     NoIntersection,
     Cross,
     EndPointTouch,
     PointOnSegment,
     Glued,
     Same
   };
 
 public:
 
   DEFINE_STANDARD_ALLOC
   
   //! Constructor.
   //! Initiates discretization of the given geometric curve.
   //! @param theCurve curve to be discretized.
   //! @param theFirstParam first parameter of the curve.
   //! @param theLastParam last parameter of the curve.
   //! @param theLinDeflection linear deflection.
   //! @param theAngDeflection angular deflection.
   //! @param theMinPointsNb minimum number of points to be produced.
   Standard_EXPORT BRepMesh_GeomTool(
     const BRepAdaptor_Curve& theCurve,
     const Standard_Real      theFirstParam,
     const Standard_Real      theLastParam,
     const Standard_Real      theLinDeflection,
     const Standard_Real      theAngDeflection,
     const Standard_Integer   theMinPointsNb = 2,
     const Standard_Real      theMinSize = Precision::Confusion());
   
   //! Constructor.
   //! Initiates discretization of geometric curve corresponding 
   //! to iso curve of the given surface.
   //! @param theSurface surface the iso curve to be taken from.
   //! @param theIsoType type of iso curve to be used, U or V.
   //! @param theParamIso parameter on the surface specifying the iso curve.
   //! @param theFirstParam first parameter of the curve.
   //! @param theLastParam last parameter of the curve.
   //! @param theLinDeflection linear deflection.
   //! @param theAngDeflection angular deflection.
   //! @param theMinPointsNb minimum number of points to be produced.
   Standard_EXPORT BRepMesh_GeomTool(
     const Handle(BRepAdaptor_Surface)& theSurface,
     const GeomAbs_IsoType               theIsoType,
     const Standard_Real                 theParamIso,
     const Standard_Real                 theFirstParam,
     const Standard_Real                 theLastParam,
     const Standard_Real                 theLinDeflection,
     const Standard_Real                 theAngDeflection,
     const Standard_Integer              theMinPointsNb = 2,
     const Standard_Real                 theMinSize = Precision::Confusion());
 
   //! Adds point to already calculated points (or replaces existing).
   //! @param thePoint point to be added.
   //! @param theParam parameter on the curve corresponding to the given point.
   //! @param theIsReplace if TRUE replaces existing point lying within 
   //! parameteric tolerance of the given point.
   //! @return index of new added point or found with parametric tolerance
   Standard_Integer AddPoint(const gp_Pnt&           thePoint,
                             const Standard_Real     theParam,
                             const Standard_Boolean  theIsReplace = Standard_True)
   {
     return myDiscretTool.AddPoint(thePoint, theParam, theIsReplace);
   }
   
   //! Returns number of discretization points.
   Standard_Integer NbPoints() const
   {
     return myDiscretTool.NbPoints();
   }
   
   //! Gets parameters of discretization point with the given index.
   //! @param theIndex index of discretization point.
   //! @param theIsoParam parameter on surface to be used as second coordinate 
   //! of resulting 2d point.
   //! @param theParam[out] parameter of the point on the iso curve.
   //! @param thePoint[out] discretization point.
   //! @param theUV[out] discretization point in parametric space of the surface.
   //! @return TRUE on success, FALSE elsewhere.
   Standard_EXPORT Standard_Boolean Value(const Standard_Integer theIndex,
                                          const Standard_Real    theIsoParam,
                                          Standard_Real&         theParam,
                                          gp_Pnt&                thePoint,
                                          gp_Pnt2d&              theUV) const;
   
   //! Gets parameters of discretization point with the given index.
   //! @param theIndex index of discretization point.
   //! @param theSurface surface the curve is lying onto.
   //! @param theParam[out] parameter of the point on the curve.
   //! @param thePoint[out] discretization point.
   //! @param theUV[out] discretization point in parametric space of the surface.
   //! @return TRUE on success, FALSE elsewhere.
   Standard_EXPORT Standard_Boolean Value(const Standard_Integer              theIndex,
                                          const Handle(BRepAdaptor_Surface)& theSurface,
                                          Standard_Real&                      theParam,
                                          gp_Pnt&                             thePoint,
                                          gp_Pnt2d&                           theUV) const;
   
 public: //! @name static API
 
   //! Computes normal to the given surface at the specified
   //! position in parametric space.
   //! @param theSurface surface the normal should be found for.
   //! @param theParamU U parameter in parametric space of the surface.
   //! @param theParamV V parameter in parametric space of the surface.
   //! @param[out] thePoint 3d point corresponding to the given parameters.
   //! @param[out] theNormal normal vector at the point specified by the parameters.
   //! @return FALSE if the normal can not be computed, TRUE elsewhere.
   Standard_EXPORT static Standard_Boolean Normal(
     const Handle(BRepAdaptor_Surface)& theSurface,
     const Standard_Real                 theParamU,
     const Standard_Real                 theParamV,
     gp_Pnt&                             thePoint,
     gp_Dir&                             theNormal);
 
   //! Checks intersection between two lines defined by two points.
   //! @param theStartPnt1 start point of first line.
   //! @param theEndPnt1 end point of first line.
   //! @param theStartPnt2 start point of second line.
   //! @param theEndPnt2 end point of second line.
   //! @param[out] theIntPnt point of intersection.
   //! @param[out] theParamOnSegment parameters of intersection point 
   //! corresponding to first and second segment.
   //! @return status of intersection check.
   Standard_EXPORT static IntFlag IntLinLin(
     const gp_XY&  theStartPnt1,
     const gp_XY&  theEndPnt1,
     const gp_XY&  theStartPnt2,
     const gp_XY&  theEndPnt2,
     gp_XY&        theIntPnt,
     Standard_Real (&theParamOnSegment)[2]);
 
   //! Checks intersection between the two segments. 
   //! Checks that intersection point lies within ranges of both segments.
   //! @param theStartPnt1 start point of first segment.
   //! @param theEndPnt1 end point of first segment.
   //! @param theStartPnt2 start point of second segment.
   //! @param theEndPnt2 end point of second segment.
   //! @param isConsiderEndPointTouch if TRUE EndPointTouch status will be
   //! returned in case if segments are touching by end points, if FALSE
   //! returns NoIntersection flag.
   //! @param isConsiderPointOnSegment if TRUE PointOnSegment status will be
   //! returned in case if end point of one segment lies onto another one, 
   //! if FALSE returns NoIntersection flag.
   //! @param[out] theIntPnt point of intersection.
   //! @return status of intersection check.
   Standard_EXPORT static IntFlag IntSegSeg(
     const gp_XY&           theStartPnt1,
     const gp_XY&           theEndPnt1,
     const gp_XY&           theStartPnt2,
     const gp_XY&           theEndPnt2,
     const Standard_Boolean isConsiderEndPointTouch,
     const Standard_Boolean isConsiderPointOnSegment,
     gp_Pnt2d&              theIntPnt);
 
   //! Compute deflection of the given segment.
   static Standard_Real SquareDeflectionOfSegment(
     const gp_Pnt& theFirstPoint,
     const gp_Pnt& theLastPoint,
     const gp_Pnt& theMidPoint)
   {
     // 23.03.2010 skl for OCC21645 - change precision for comparison
     if (theFirstPoint.SquareDistance(theLastPoint) > Precision::SquareConfusion())
     {
       gp_Lin aLin(theFirstPoint, gp_Dir(gp_Vec(theFirstPoint, theLastPoint)));
       return aLin.SquareDistance(theMidPoint);
     }
 
     return theFirstPoint.SquareDistance(theMidPoint);
   }
 
   // For better meshing performance we try to estimate the acceleration circles grid structure sizes:
   // For each parametric direction (U, V) we estimate firstly an approximate distance between the future points -
   // this estimation takes into account the required face deflection and the complexity of the face.
   // Particularly, the complexity of the faces based on BSpline curves and surfaces requires much more points.
   // At the same time, for planar faces and linear parts of the arbitrary surfaces usually no intermediate points
   // are necessary.
   // The general idea for each parametric direction:
   // cells_count = 2 ^ log10 ( estimated_points_count )
   // For linear parametric direction we fall back to the initial vertex count:
   // cells_count = 2 ^ log10 ( initial_vertex_count )
   Standard_EXPORT static std::pair<Standard_Integer, Standard_Integer> CellsCount (
     const Handle (Adaptor3d_Surface)&   theSurface,
     const Standard_Integer               theVerticesNb,
     const Standard_Real                  theDeflection,
     const BRepMesh_DefaultRangeSplitter* theRangeSplitter);
 
 private:
 
   //! Classifies the point in case of coincidence of two vectors.
   //! @param thePoint1 the start point of a segment (base point).
   //! @param thePoint2 the end point of a segment.
   //! @param thePointToCheck the point to classify.
   //! @return zero value if point is out of segment and non zero value 
   //! if point is between the first and the second point of segment.
   static Standard_Integer classifyPoint (const gp_XY& thePoint1,
                                          const gp_XY& thePoint2,
                                          const gp_XY& thePointToCheck);
 
 private:
 
   const TopoDS_Edge*                  myEdge;
   GCPnts_TangentialDeflection         myDiscretTool;
   GeomAbs_IsoType                     myIsoType;
 };
 
 #endif

This page was automatically generated by the 2.3.7 LXR engine. The LXR team