source: trunk/source/processes/hadronic/models/neutron_hp/include/G4NeutronHPInterpolator.hh @ 846

Last change on this file since 846 was 819, checked in by garnier, 16 years ago

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27// $Id: G4NeutronHPInterpolator.hh,v 1.19 2006/06/29 20:48:13 gunter Exp $
28// GEANT4 tag $Name:  $
29//
30#ifndef G4NeutronHPInterpolator_h
31#define G4NeutronHPInterpolator_h 1
32
33#include "globals.hh"
34#include "G4InterpolationScheme.hh"
35#include "Randomize.hh"
36#include "G4ios.hh"
37#include "G4HadronicException.hh"
38
39
40class G4NeutronHPInterpolator
41{
42  public:
43 
44  G4NeutronHPInterpolator(){}
45  ~G4NeutronHPInterpolator()
46   {
47    //  G4cout <<"deleted the interpolator"<<G4endl;
48   }
49 
50  inline G4double Lin(G4double x,G4double x1,G4double x2,G4double y1,G4double y2)
51  {
52    G4double slope=0, off=0;
53    if(x2-x1==0) return (y2+y1)/2.;
54    slope = (y2-y1)/(x2-x1);
55    off = y2-x2*slope;
56    G4double y = x*slope+off;
57    return y;
58  }
59 
60  inline G4double Interpolate(G4InterpolationScheme aScheme,
61                              G4double x, G4double x1, G4double x2,
62                                          G4double y1, G4double y2) const;       
63 
64  G4double
65  GetBinIntegral(const G4InterpolationScheme & aScheme, 
66                const G4double x1,const G4double x2,const G4double y1,const G4double y2);
67
68  G4double
69  GetWeightedBinIntegral(const G4InterpolationScheme & aScheme, 
70                const G4double x1,const G4double x2,const G4double y1,const G4double y2);
71
72  private:
73 
74  inline G4double Histogram(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
75  inline G4double LinearLinear(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
76  inline G4double LinearLogarithmic(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
77  inline G4double LogarithmicLinear(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
78  inline G4double LogarithmicLogarithmic(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
79  inline G4double Random(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const;
80
81};
82
83inline G4double G4NeutronHPInterpolator::
84Interpolate(G4InterpolationScheme aScheme,
85            G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const
86{
87  G4double result(0);
88  G4int theScheme = aScheme;
89  theScheme = theScheme%CSTART_;
90  switch(theScheme)
91  {
92    case 1:
93      result = Histogram(x, x1, x2, y1, y2);
94      break;
95    case 2:
96      result = LinearLinear(x, x1, x2, y1, y2);
97      break;
98    case 3:
99      result = LinearLogarithmic(x, x1, x2, y1, y2);
100      break;
101    case 4:
102      result = LogarithmicLinear(x, x1, x2, y1, y2);
103      break;
104    case 5:
105      result = LogarithmicLogarithmic(x, x1, x2, y1, y2);
106      break;
107    case 6:
108      result = Random(x, x1, x2, y1, y2);
109      break;
110    default:
111      G4cout << "theScheme = "<<theScheme<<G4endl;
112      throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPInterpolator::Carthesian Invalid InterpolationScheme");
113      break;
114  }
115  return result;
116}
117
118inline G4double G4NeutronHPInterpolator::
119Histogram(G4double , G4double , G4double , G4double y1, G4double ) const
120{
121  G4double result;
122  result = y1;
123  return result;
124}
125
126inline G4double G4NeutronHPInterpolator::
127LinearLinear(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const
128{
129  G4double slope=0, off=0;
130  if(x2-x1==0) return (y2+y1)/2.;
131  slope = (y2-y1)/(x2-x1);
132  off = y2-x2*slope;
133  G4double y = x*slope+off;
134  return y;
135}
136
137inline G4double G4NeutronHPInterpolator::
138LinearLogarithmic(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const
139{
140  G4double result;
141  if(x==0) result = y1+y2/2.;
142  else if(x1==0) result = y1;
143  else if(x2==0) result = y2;
144  else result = LinearLinear(std::log(x), std::log(x1), std::log(x2), y1, y2);
145  return result;
146}
147 
148inline G4double G4NeutronHPInterpolator::
149LogarithmicLinear(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const
150{
151  G4double result;
152  if(y1==0||y2==0) result = 0;
153  else 
154  {
155    result = LinearLinear(x, x1, x2, std::log(y1), std::log(y2));
156    result = std::exp(result);
157  }
158  return result;
159}
160 
161inline G4double G4NeutronHPInterpolator::
162LogarithmicLogarithmic(G4double x, G4double x1, G4double x2, G4double y1, G4double y2) const
163{
164  G4double result;
165  if(x==0) result = y1+y2/2.;
166  else if(x1==0) result = y1;
167  else if(x2==0) result = y2;
168  if(y1==0||y2==0) result = 0;
169  else 
170  {
171    result = LinearLinear(std::log(x), std::log(x1), std::log(x2), std::log(y1), std::log(y2));
172    result = std::exp(result);
173  }
174  return result;
175}
176
177inline G4double G4NeutronHPInterpolator::
178Random(G4double , G4double , G4double , G4double y1, G4double y2) const
179{
180  G4double result;
181  result = y1+G4UniformRand()*(y2-y1);
182  return result;
183}
184
185#endif
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