1 | #ifndef G4CASCADE_INTERPOLATOR_HH |
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2 | #define G4CASCADE_INTERPOLATOR_HH |
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3 | // |
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4 | // ******************************************************************** |
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5 | // * License and Disclaimer * |
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6 | // * * |
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7 | // * The Geant4 software is copyright of the Copyright Holders of * |
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8 | // * the Geant4 Collaboration. It is provided under the terms and * |
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9 | // * conditions of the Geant4 Software License, included in the file * |
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10 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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11 | // * include a list of copyright holders. * |
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12 | // * * |
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13 | // * Neither the authors of this software system, nor their employing * |
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14 | // * institutes,nor the agencies providing financial support for this * |
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15 | // * work make any representation or warranty, express or implied, * |
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16 | // * regarding this software system or assume any liability for its * |
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17 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * for the full disclaimer and the limitation of liability. * |
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19 | // * * |
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20 | // * This code implementation is the result of the scientific and * |
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21 | // * technical work of the GEANT4 collaboration. * |
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22 | // * By using, copying, modifying or distributing the software (or * |
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23 | // * any work based on the software) you agree to acknowledge its * |
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24 | // * use in resulting scientific publications, and indicate your * |
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25 | // * acceptance of all terms of the Geant4 Software license. * |
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26 | // ******************************************************************** |
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27 | // $Id: G4CascadeInterpolator.hh,v 1.1 2010/05/14 18:01:28 mkelsey Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
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29 | // |
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30 | // Author: Michael Kelsey <kelsey@slac.stanford.edu> |
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31 | // |
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32 | // Simple linear interpolation class, more lightweight than |
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33 | // G4PhysicsVector. Templated on number of X-axis (usually energy) |
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34 | // bins, constructor takes a C-array of bin edges as input, and an |
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35 | // optional flag whether to extrapolate (the default) or truncate values |
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36 | // beyond the bin boundaries. |
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37 | // |
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38 | // The interpolation action returns a simple double: the integer part |
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39 | // is the bin index, and the fractional part is, obviously, the |
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40 | // fractional part. |
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41 | |
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42 | #include "globals.hh" |
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43 | #include <cfloat> |
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44 | |
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45 | |
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46 | template <int NBINS> |
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47 | class G4CascadeInterpolator { |
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48 | public: |
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49 | enum { nBins=NBINS, last=NBINS-1 }; |
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50 | |
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51 | G4CascadeInterpolator(const G4double (&xb)[nBins], G4bool extrapolate=true) |
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52 | : xBins(xb), doExtrapolation(extrapolate), |
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53 | lastX(-DBL_MAX), lastVal(-DBL_MAX) {} |
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54 | |
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55 | virtual ~G4CascadeInterpolator() {} |
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56 | |
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57 | // Find bin position (index and fraction) from input argument |
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58 | G4double getBin(const G4double x) const; |
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59 | |
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60 | // Apply bin position from first input to second (array) |
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61 | G4double interpolate(const G4double x, const G4double (&yb)[nBins]) const; |
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62 | G4double interpolate(const G4double (&yb)[nBins]) const; |
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63 | |
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64 | private: |
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65 | const G4double (&xBins)[nBins]; |
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66 | G4bool doExtrapolation; |
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67 | |
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68 | mutable G4double lastX; // Buffers to remember previous call |
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69 | mutable G4double lastVal; |
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70 | }; |
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71 | |
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72 | // NOTE: G4 requires template function definitions in .hh file |
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73 | #include "G4CascadeInterpolator.icc" |
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74 | |
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75 | #endif /* G4CASCADE_INTERPOLATOR_HH */ |
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