| 1 | #ifndef MARS_MHexagonalFT
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| 2 | #define MARS_MHexagonalFT
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| 3 |
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| 4 | #ifndef ROOT_TObject
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| 5 | #include <TObject.h>
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| 6 | #endif
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| 7 | #ifndef ROOT_MArrayF
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| 8 | #include "MArrayF.h"
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| 9 | #endif
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| 10 | #ifndef ROOT_MArrayI
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| 11 | #include "MArrayI.h"
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| 12 | #endif
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| 13 |
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| 14 | class MArrayD;
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| 15 | class MGeomCam;
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| 16 |
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| 17 | class MHexagonalFT : public TObject
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| 18 | {
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| 19 | private:
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| 20 |
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| 21 | int Delta(int i) const
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| 22 | {
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| 23 | return i==0 || i==(Int_t)fNumRows-1 ? 1 : 0;
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| 24 | } // Delta(i) = kronecker(i%(fNumRows-1), 0)
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| 25 | float P(int j, int n) const
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| 26 | {
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| 27 | const Int_t a = Delta(j+n);
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| 28 | const Int_t b = Delta(j);
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| 29 | const Int_t c = Delta(n);
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| 30 |
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| 31 | return 6./((1+a)*(1+b+c));
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| 32 | } // Definition of P(i,j) see paper
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| 33 |
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| 34 | UInt_t fNumRows;
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| 35 |
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| 36 | MArrayF fPsi;
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| 37 |
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| 38 | MArrayI fM;
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| 39 | MArrayI fK;
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| 40 |
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| 41 | MArrayF fP;
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| 42 |
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| 43 | MArrayI fIdx;
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| 44 |
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| 45 | public:
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| 46 | MHexagonalFT();
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| 47 | MHexagonalFT(Int_t num);
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| 48 |
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| 49 | void Prepare(Int_t num);
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| 50 |
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| 51 | void TransformFastFWD(const MArrayD &inre, MArrayD &outre, MArrayD &outim) const;
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| 52 | void TransformFastBWD(const MArrayD &inre, const MArrayD &inim, MArrayD &outre) const;
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| 53 |
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| 54 | void TransformSlow(const MArrayD &inre, const MArrayD &inim,
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| 55 | MArrayD &outre, MArrayD &outim, Bool_t fwd=kTRUE);
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| 56 |
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| 57 | UInt_t GetNumKnots() const { return fP.GetSize(); } // Return number of knots in triangle
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| 58 | UInt_t GetNumRows() const { return fNumRows; } // return number of rows in triangle
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| 59 |
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| 60 | UInt_t M(UShort_t i) const { return fM[i]; } // return m-axis-index of absolute index i
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| 61 | UInt_t K(UShort_t i) const { return fK[i]; } // return k-axis-index of absolute index i
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| 62 |
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| 63 | Int_t GetRow(UShort_t i) const { return fM[i]+fK[i]; } // return row-index of absolute index i
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| 64 | Int_t GetCol(UShort_t i) const { return fM[i]-fK[i]; } // return col-index of absolute index i
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| 65 |
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| 66 | ClassDef(MHexagonalFT,0) // general hexagonal fourier transformation
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| 67 | };
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| 68 |
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| 69 | #endif
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