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2 | // ******************************************************************** |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: MCTruthManager.cc,v 1.2 2006/12/13 15:42:36 gunter Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------- |
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32 | // GEANT 4 - MCTruthManager class |
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33 | // -------------------------------------------------------------- |
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34 | // |
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35 | // Author: Witold POKORSKI (Witold.Pokorski@cern.ch) |
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36 | // |
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37 | // -------------------------------------------------------------- |
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38 | |
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39 | #include "MCTruthManager.hh" |
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40 | |
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41 | static MCTruthManager* instance = 0; |
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42 | |
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43 | MCTruthManager::MCTruthManager() : config(0) |
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44 | {} |
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45 | |
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46 | MCTruthManager::~MCTruthManager() |
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47 | {} |
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48 | |
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49 | MCTruthManager* MCTruthManager::GetInstance() |
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50 | { |
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51 | if( instance == 0 ) |
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52 | { |
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53 | instance = new MCTruthManager(); |
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54 | } |
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55 | return instance; |
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56 | } |
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57 | |
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58 | void MCTruthManager::NewEvent() |
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59 | { |
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60 | // first delete the old event |
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61 | delete event; |
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62 | // and now instaciate a new one |
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63 | event = new HepMC::GenEvent(); |
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64 | } |
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65 | |
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66 | void MCTruthManager::AddParticle(G4LorentzVector& momentum, |
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67 | G4LorentzVector& prodpos, |
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68 | G4LorentzVector& endpos, |
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69 | G4int pdg_id, G4int partID, G4int motherID, |
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70 | G4bool directParent) |
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71 | { |
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72 | // we create a new particle with barcode = partID |
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73 | HepMC::GenParticle* particle = new HepMC::GenParticle(momentum, pdg_id); |
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74 | particle->suggest_barcode(partID); |
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75 | // we initialize the 'segmentations' map |
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76 | // for the moment particle is not 'segmented' |
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77 | segmentations[partID] = 1; |
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78 | |
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79 | // we create the GenVertex corresponding to the end point of the track |
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80 | HepMC::GenVertex* endvertex = new HepMC::GenVertex(endpos); |
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81 | |
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82 | // barcode of the endvertex = - barcode of the track |
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83 | endvertex->suggest_barcode(-partID); |
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84 | endvertex->add_particle_in(particle); |
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85 | event->add_vertex(endvertex); |
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86 | |
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87 | if(motherID) // not a primary |
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88 | { |
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89 | // here we could try to improve speed by searching only through particles which |
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90 | // belong to the given primary tree |
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91 | HepMC::GenParticle* mother = event->barcode_to_particle(motherID); |
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92 | // |
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93 | if(mother) |
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94 | { |
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95 | // we first check whether the mother's end vertex corresponds to the particle's |
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96 | // production vertex |
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97 | HepMC::GenVertex* motherendvtx = mother->end_vertex(); |
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98 | G4LorentzVector motherendpos = motherendvtx->position(); |
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99 | |
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100 | if( motherendpos.x() == prodpos.x() && |
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101 | motherendpos.y() == prodpos.y() && |
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102 | motherendpos.z() == prodpos.z() ) // if yes, we attach the particle |
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103 | { |
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104 | motherendvtx->add_particle_out(particle); |
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105 | } |
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106 | else // if not, we check whether the mother is biological or adopted |
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107 | { |
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108 | if(!directParent) // adopted |
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109 | { |
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110 | G4bool found = false; |
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111 | |
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112 | // first check if any of the dummy particles |
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113 | // has the end vertex at the right place |
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114 | // |
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115 | for(HepMC::GenVertex::particles_out_const_iterator |
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116 | it=motherendvtx->particles_out_const_begin(); |
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117 | it!=motherendvtx->particles_out_const_end();it++) |
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118 | { |
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119 | if((*it)->pdg_id()==-999999) |
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120 | { |
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121 | G4LorentzVector dummypos = (*it)->end_vertex()->position(); |
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122 | |
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123 | if( dummypos.x() == prodpos.x() && |
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124 | dummypos.y() == prodpos.y() && |
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125 | dummypos.z() == prodpos.z() ) |
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126 | { |
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127 | (*it)->end_vertex()->add_particle_out(particle); |
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128 | found = true; |
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129 | break; |
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130 | } |
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131 | } |
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132 | } |
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133 | |
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134 | // and if not, create a dummy particle connecting |
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135 | // to the end vertex of the mother |
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136 | // |
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137 | if(!found) |
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138 | { |
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139 | HepMC::GenVertex* childvtx = new HepMC::GenVertex(prodpos); |
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140 | childvtx->add_particle_out(particle); |
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141 | |
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142 | // the dummy vertex gets the barcode -500000 |
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143 | // minus the daughter particle barcode |
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144 | // |
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145 | childvtx->suggest_barcode(-500000-partID); |
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146 | event->add_vertex(childvtx); |
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147 | |
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148 | HepMC::GenParticle* dummypart = |
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149 | new HepMC::GenParticle(G4LorentzVector(),-999999); |
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150 | |
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151 | // the dummy particle gets the barcode 500000 |
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152 | // plus the daughter particle barcode |
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153 | // |
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154 | dummypart->suggest_barcode(500000+partID); |
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155 | childvtx->add_particle_in(dummypart); |
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156 | motherendvtx->add_particle_out(dummypart); |
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157 | } |
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158 | } |
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159 | else // biological |
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160 | { |
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161 | // in case mother was already 'split' we need to look for |
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162 | // the right 'segment' to add the new daugther. |
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163 | // We use Time coordinate to locate the place for the new vertex |
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164 | |
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165 | G4int number_of_segments = segmentations[motherID]; |
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166 | G4int segment = 0; |
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167 | |
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168 | // we loop through the segments |
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169 | // |
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170 | while ( !((mother->end_vertex()->position().t()>prodpos.t()) && |
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171 | (mother->production_vertex()->position().t()<prodpos.t())) ) |
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172 | { |
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173 | segment++; |
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174 | if (segment == number_of_segments) |
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175 | G4cerr << "Problem!!!! Time coordinates incompatible!" << G4endl; |
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176 | |
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177 | mother = event->barcode_to_particle(segment*10000000 + motherID); |
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178 | } |
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179 | |
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180 | // now, we 'split' the appropriate 'segment' of the mother particle |
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181 | // into two particles and create a new vertex |
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182 | // |
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183 | HepMC::GenVertex* childvtx = new HepMC::GenVertex(prodpos); |
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184 | childvtx->add_particle_out(particle); |
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185 | event->add_vertex(childvtx); |
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186 | |
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187 | // we first detach the mother from its original vertex |
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188 | // |
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189 | HepMC::GenVertex* orig_mother_end_vtx = mother->end_vertex(); |
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190 | orig_mother_end_vtx->remove_particle(mother); |
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191 | |
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192 | // and attach it to the new vertex |
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193 | // |
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194 | childvtx->add_particle_in(mother); |
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195 | |
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196 | // now we create a new particle representing the mother after |
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197 | // interaction the barcode of the new particle is 10000000 + the |
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198 | // original barcode |
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199 | // |
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200 | HepMC::GenParticle* mothertwo = new HepMC::GenParticle(*mother); |
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201 | mothertwo->suggest_barcode(segmentations[motherID]*10000000 |
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202 | + mother->barcode()); |
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203 | |
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204 | // we also reset the barcodes of the vertices |
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205 | // |
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206 | orig_mother_end_vtx->suggest_barcode(-segmentations[motherID] |
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207 | *10000000 - mother->barcode()); |
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208 | childvtx->suggest_barcode(-mother->barcode()); |
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209 | |
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210 | // we attach it to the new vertex where interaction took place |
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211 | // |
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212 | childvtx->add_particle_out(mothertwo); |
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213 | |
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214 | // and we attach it to the original endvertex |
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215 | // |
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216 | orig_mother_end_vtx->add_particle_in(mothertwo); |
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217 | |
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218 | // and finally ... the increase the 'segmentation counter' |
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219 | // |
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220 | segmentations[motherID] = segmentations[motherID]+1; |
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221 | } |
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222 | } |
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223 | } |
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224 | else |
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225 | // mother GenParticle is not there for some reason... |
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226 | // if this happens, we need to revise the philosophy... |
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227 | // a solution would be to create HepMC particles |
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228 | // at the begining of each track |
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229 | { |
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230 | G4cerr << "barcode " << motherID << " mother not there! "<< G4endl; |
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231 | } |
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232 | } |
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233 | else // primary |
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234 | { |
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235 | HepMC::GenVertex* primaryvtx = new HepMC::GenVertex(prodpos); |
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236 | primaryvtx->add_particle_out(particle); |
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237 | event->add_vertex(primaryvtx); |
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238 | |
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239 | // add id to the list of primaries |
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240 | // |
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241 | primarybarcodes.push_back(partID); |
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242 | } |
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243 | } |
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244 | |
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245 | void MCTruthManager::PrintEvent() |
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246 | { |
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247 | event->print(); |
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248 | |
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249 | // looping over primaries and print the decay tree for each of them |
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250 | // |
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251 | for(std::vector<int>::const_iterator primarybar=primarybarcodes.begin(); |
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252 | primarybar!=primarybarcodes.end();primarybar++) |
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253 | { |
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254 | printTree(event->barcode_to_particle(*primarybar), " | "); |
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255 | } |
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256 | } |
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257 | |
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258 | void MCTruthManager::printTree(HepMC::GenParticle* particle, G4String offset) |
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259 | { |
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260 | G4cout << offset << "--- barcode: " << particle->barcode() << " pdg: " |
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261 | << particle->pdg_id() << " energy: " << particle->momentum().e() |
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262 | << " production vertex: "<< particle->production_vertex()->position() |
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263 | << G4endl; |
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264 | |
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265 | for(HepMC::GenVertex::particles_out_const_iterator |
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266 | it=particle->end_vertex()->particles_out_const_begin(); |
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267 | it!=particle->end_vertex()->particles_out_const_end(); |
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268 | it++) |
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269 | { |
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270 | G4String deltaoffset = ""; |
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271 | |
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272 | if( std::fmod((*it)->barcode(),10000000) != std::fmod(particle->barcode(),10000000) ) |
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273 | { |
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274 | deltaoffset = " | "; |
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275 | } |
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276 | |
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277 | printTree((*it), offset + deltaoffset); |
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278 | } |
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279 | } |
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