include/opencascade/Vrml_LOD.hxx

0001 // Created on: 1997-02-10
0002 // Created by: Alexander BRIVIN
0003 // Copyright (c) 1997-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _Vrml_LOD_HeaderFile
0018 #define _Vrml_LOD_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_Type.hxx>
0022
0023 #include <NCollection_Array1.hxx>
0024 #include <NCollection_HArray1.hxx>
0025 #include <gp_Vec.hxx>
0026 #include <Standard_Transient.hxx>
0027 #include <Standard_OStream.hxx>
0028
0029 //! defines a LOD (level of detailization) node of VRML specifying properties
0030 //! of geometry and its appearance.
0031 //! This group node is used to allow applications to switch between
0032 //! various representations of objects automatically. The children of this
0033 //! node typically represent the same object or objects at the varying
0034 //! of Levels Of Detail (LOD), from highest detail to lowest.
0035 //!
0036 //! The specified center point of the LOD is transformed by current
0037 //! transformation into world space, and the distance from the transformed
0038 //! center to the world-space eye point is calculated.
0039 //! If thedistance is less than the first value in the ranges array,
0040 //! than the first child of the LOD group is drawn. If between
0041 //! the first and second values in the range array, the second child
0042 //! is drawn, etc.
0043 //! If there are N values in the range array, the LOD group should
0044 //! have N+1 children.
0045 //! Specifying too few children will result in the last child being
0046 //! used repeatedly for the lowest levels of detail; if too many children
0047 //! are specified, the extra children will be ignored.
0048 //! Each value in the ranges array should be greater than the previous
0049 //! value, otherwise results are undefined.
0050 class Vrml_LOD : public Standard_Transient
0051 {
0052
0053 public:
0054   Standard_EXPORT Vrml_LOD();
0055
0056   Standard_EXPORT Vrml_LOD(const occ::handle<NCollection_HArray1<double>>& aRange,
0057                            const gp_Vec&                                   aCenter);
0058
0059   Standard_EXPORT void SetRange(const occ::handle<NCollection_HArray1<double>>& aRange);
0060
0061   Standard_EXPORT occ::handle<NCollection_HArray1<double>> Range() const;
0062
0063   Standard_EXPORT void SetCenter(const gp_Vec& aCenter);
0064
0065   Standard_EXPORT gp_Vec Center() const;
0066
0067   Standard_EXPORT Standard_OStream& Print(Standard_OStream& anOStream) const;
0068
0069   DEFINE_STANDARD_RTTIEXT(Vrml_LOD, Standard_Transient)
0070
0071 private:
0072   occ::handle<NCollection_HArray1<double>> myRange;
0073   gp_Vec                                   myCenter;
0074   bool                                     myRangeFlag;
0075 };
0076
0077 #endif // _Vrml_LOD_HeaderFile