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 // Created on: 1992-08-26
 // Created by: Jean Louis FRENKEL
 // Copyright (c) 1992-1999 Matra Datavision
 // 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 _Prs3d_HeaderFile
 #define _Prs3d_HeaderFile
 
 #include <Graphic3d_ArrayOfPrimitives.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Prs3d_Drawer.hxx>
 #include <Prs3d_NListOfSequenceOfPnt.hxx>
 #include <Prs3d_Presentation.hxx>
 
 class Poly_Triangulation;
 
 //! The Prs3d package provides the following services
 //! -   a presentation object (the context for all
 //! modifications to the display, its presentation will be
 //! displayed in every view of an active viewer)
 //! -   an attribute manager governing how objects such
 //! as color, width, and type of line are displayed;
 //! these are generic objects, whereas those in
 //! StdPrs are specific geometries and topologies.
 //! -   generic   algorithms providing default settings for
 //! objects such as points, curves, surfaces and shapes
 //! -   a root object which provides the abstract
 //! framework for the DsgPrs definitions at work in
 //! display of dimensions, relations and trihedra.
 class Prs3d
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! draws an arrow at a given location, with respect
   //! to a given direction.
   Standard_EXPORT static Standard_Boolean MatchSegment(const Standard_Real X,
                                                        const Standard_Real Y,
                                                        const Standard_Real Z,
                                                        const Standard_Real aDistance,
                                                        const gp_Pnt&       p1,
                                                        const gp_Pnt&       p2,
                                                        Standard_Real&      dist);
 
   //! Computes the absolute deflection value based on relative deflection
   //! Prs3d_Drawer::DeviationCoefficient().
   //! @param[in] theBndMin  bounding box min corner
   //! @param[in] theBndMax  bounding box max corner
   //! @param[in] theDeviationCoefficient  relative deflection coefficient from
   //! Prs3d_Drawer::DeviationCoefficient()
   //! @return absolute deflection coefficient based on bounding box dimensions
   static Standard_Real GetDeflection(const Graphic3d_Vec3d& theBndMin,
                                      const Graphic3d_Vec3d& theBndMax,
                                      const Standard_Real    theDeviationCoefficient)
   {
     const Graphic3d_Vec3d aDiag = theBndMax - theBndMin;
     return Max(aDiag.maxComp() * theDeviationCoefficient * 4.0, Precision::Confusion());
   }
 
   //! Computes the absolute deflection value based on relative deflection
   //! Prs3d_Drawer::DeviationCoefficient().
   //! @param[in] theBndBox  bounding box
   //! @param[in] theDeviationCoefficient  relative deflection coefficient from
   //! Prs3d_Drawer::DeviationCoefficient()
   //! @param[in] theMaximalChordialDeviation  absolute deflection coefficient from
   //! Prs3d_Drawer::MaximalChordialDeviation()
   //! @return absolute deflection coefficient based on bounding box dimensions or
   //! theMaximalChordialDeviation if bounding box is Void or Infinite
   static Standard_Real GetDeflection(const Bnd_Box&      theBndBox,
                                      const Standard_Real theDeviationCoefficient,
                                      const Standard_Real theMaximalChordialDeviation)
   {
     if (theBndBox.IsVoid())
     {
       return theMaximalChordialDeviation;
     }
 
     Bnd_Box aBndBox = theBndBox;
     if (theBndBox.IsOpen())
     {
       if (!theBndBox.HasFinitePart())
       {
         return theMaximalChordialDeviation;
       }
       aBndBox = theBndBox.FinitePart();
     }
 
     Graphic3d_Vec3d aVecMin, aVecMax;
     aBndBox.Get(aVecMin.x(), aVecMin.y(), aVecMin.z(), aVecMax.x(), aVecMax.y(), aVecMax.z());
     return GetDeflection(aVecMin, aVecMax, theDeviationCoefficient);
   }
 
   //! Assembles array of primitives for sequence of polylines.
   //! @param[in] thePoints  the polylines sequence
   //! @return array of primitives
   Standard_EXPORT static Handle(Graphic3d_ArrayOfPrimitives) PrimitivesFromPolylines(
     const Prs3d_NListOfSequenceOfPnt& thePoints);
 
   //! Add primitives into new group in presentation and clear the list of polylines.
   Standard_EXPORT static void AddPrimitivesGroup(const Handle(Prs3d_Presentation)& thePrs,
                                                  const Handle(Prs3d_LineAspect)&   theAspect,
                                                  Prs3d_NListOfSequenceOfPnt&       thePolylines);
 
   //! Add triangulation free edges into sequence of line segments.
   //! @param[out] theSegments  sequence of line segments to fill
   //! @param[in] thePolyTri    triangulation to process
   //! @param[in] theLocation   transformation to apply
   Standard_EXPORT static void AddFreeEdges(TColgp_SequenceOfPnt&             theSegments,
                                            const Handle(Poly_Triangulation)& thePolyTri,
                                            const gp_Trsf&                    theLocation);
 };
 
 #endif // _Prs3d_HeaderFile

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