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1 | // Created on: 1991-03-12 |
| 2 | // Created by: Michel CHAUVAT |
| 3 | // Copyright (c) 1991-1999 Matra Datavision |
| 4 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
| 5 | // |
| 6 | // This file is part of Open CASCADE Technology software library. |
| 7 | // |
| 8 | // This library is free software; you can redistribute it and/or modify it under |
| 9 | // the terms of the GNU Lesser General Public License version 2.1 as published |
| 10 | // by the Free Software Foundation, with special exception defined in the file |
| 11 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
| 12 | // distribution for complete text of the license and disclaimer of any warranty. |
| 13 | // |
| 14 | // Alternatively, this file may be used under the terms of Open CASCADE |
| 15 | // commercial license or contractual agreement. |
| 16 | |
| 17 | #ifndef _GProp_HeaderFile |
| 18 | #define _GProp_HeaderFile |
| 19 | |
| 20 | #include <Standard.hxx> |
| 21 | #include <Standard_DefineAlloc.hxx> |
| 22 | #include <Standard_Handle.hxx> |
| 23 | |
| 24 | #include <Standard_Real.hxx> |
| 25 | class gp_Pnt; |
| 26 | class gp_Mat; |
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27 | |
| 28 | |
| 29 | |
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30 | //! This package defines algorithms to compute the global properties |
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31 | //! of a set of points, a curve, a surface, a solid (non infinite |
| 32 | //! region of space delimited with geometric entities), a compound |
| 33 | //! geometric system (heterogeneous composition of the previous |
| 34 | //! entities). |
| 35 | //! |
| 36 | //! Global properties are : |
| 37 | //! . length, area, volume, |
| 38 | //! . centre of mass, |
| 39 | //! . axis of inertia, |
| 40 | //! . moments of inertia, |
| 41 | //! . radius of gyration. |
| 42 | //! |
| 43 | //! It provides also a class to compile the average point or |
| 44 | //! line of a set of points. |
| 45 | class GProp |
| 46 | { |
| 47 | public: |
| 48 | |
| 49 | DEFINE_STANDARD_ALLOC |
| 50 | |
| 51 | |
| 52 | //! methods of package |
| 53 | //! Computes the matrix Operator, referred to as the |
| 54 | //! "Huyghens Operator" of a geometric system at the |
| 55 | //! point Q of the space, using the following data : |
| 56 | //! - Mass, i.e. the mass of the system, |
| 57 | //! - G, the center of mass of the system. |
| 58 | //! The "Huyghens Operator" is used to compute |
| 59 | //! Inertia/Q, the matrix of inertia of the system at |
| 60 | //! the point Q using Huyghens' theorem : |
| 61 | //! Inertia/Q = Inertia/G + HOperator (Q, G, Mass) |
| 62 | //! where Inertia/G is the matrix of inertia of the |
| 63 | //! system relative to its center of mass as returned by |
| 64 | //! the function MatrixOfInertia on any GProp_GProps object. |
| 65 | Standard_EXPORT static void HOperator (const gp_Pnt& G, const gp_Pnt& Q, const Standard_Real Mass, gp_Mat& Operator); |
| 66 | |
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67 | }; |
| 68 | |
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69 | #endif // _GProp_HeaderFile |
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