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1 | // Created by: Kirill GAVRILOV |
| 2 | // Copyright (c) 2016 OPEN CASCADE SAS |
| 3 | // |
| 4 | // This file is part of Open CASCADE Technology software library. |
| 5 | // |
| 6 | // This library is free software; you can redistribute it and/or modify it under |
| 7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
| 8 | // by the Free Software Foundation, with special exception defined in the file |
| 9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
| 10 | // distribution for complete text of the license and disclaimer of any warranty. |
| 11 | // |
| 12 | // Alternatively, this file may be used under the terms of Open CASCADE |
| 13 | // commercial license or contractual agreement. |
| 14 | |
| 15 | #ifndef _NCollection_Lerp_HeaderFile |
| 16 | #define _NCollection_Lerp_HeaderFile |
| 17 | |
| 18 | //! Simple linear interpolation tool (also known as mix() in GLSL). |
| 19 | //! The main purpose of this template class is making interpolation routines more readable. |
| 20 | template<class T> |
| 21 | class NCollection_Lerp |
| 22 | { |
| 23 | public: |
| 24 | //! Compute interpolated value between two values. |
| 25 | //! @param theStart first value |
| 26 | //! @param theEnd second value |
| 27 | //! @param theT normalized interpolation coefficient within [0, 1] range, |
| 28 | //! with 0 pointing to theStart and 1 to theEnd. |
| 29 | static T Interpolate (const T& theStart, |
| 30 | const T& theEnd, |
| 31 | double theT) |
| 32 | { |
| 33 | T aResult; |
| 34 | NCollection_Lerp aLerp (theStart, theEnd); |
| 35 | aLerp.Interpolate (theT, aResult); |
| 36 | return aResult; |
| 37 | } |
| 38 | |
| 39 | public: |
| 40 | |
| 41 | //! Empty constructor |
| 42 | NCollection_Lerp() : myStart(), myEnd() {} |
| 43 | |
| 44 | //! Main constructor. |
| 45 | NCollection_Lerp (const T& theStart, const T& theEnd) |
| 46 | { |
| 47 | Init (theStart, theEnd); |
| 48 | } |
| 49 | |
| 50 | //! Initialize values. |
| 51 | void Init (const T& theStart, const T& theEnd) |
| 52 | { |
| 53 | myStart = theStart; |
| 54 | myEnd = theEnd; |
| 55 | } |
| 56 | |
| 57 | //! Compute interpolated value between two values. |
| 58 | //! @param theT normalized interpolation coefficient within [0, 1] range, |
| 59 | //! with 0 pointing to first value and 1 to the second value. |
| 60 | //! @param theResult [out] interpolated value |
| 61 | void Interpolate (double theT, T& theResult) const |
| 62 | { |
| 63 | theResult = (1.0 - theT) * myStart + theT * myEnd; |
| 64 | } |
| 65 | |
| 66 | private: |
| 67 | T myStart; |
| 68 | T myEnd; |
| 69 | }; |
| 70 | |
| 71 | #endif // _NCollection_Lerp_HeaderFile |
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