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PHG4ParticleGeneratorBase.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file PHG4ParticleGeneratorBase.cc
2 
3 #include "PHG4Particle.h" // for PHG4Particle
4 #include "PHG4Particlev1.h"
5 
6 #include "PHG4InEvent.h"
8 #include "PHG4VtxPoint.h"
9 
12 
13 #include <phool/PHCompositeNode.h>
14 #include <phool/PHDataNode.h> // for PHDataNode
15 #include <phool/PHNode.h> // for PHNode
16 #include <phool/PHNodeIterator.h> // for PHNodeIterator
17 #include <phool/PHObject.h> // for PHObject
18 #include <phool/PHRandomSeed.h>
19 #include <phool/getClass.h>
20 #include <phool/phool.h> // for PHWHERE
21 
22 #include <TSystem.h>
23 
24 #include <Geant4/G4ParticleDefinition.hh>
25 #include <Geant4/G4ParticleTable.hh>
26 #include <Geant4/G4SystemOfUnits.hh>
27 
28 #include <HepMC/SimpleVector.h> // for FourVector
29 
30 #include <gsl/gsl_rng.h>
31 
32 #include <cassert>
33 #include <cstdlib> // for exit
34 #include <iostream> // for operator<<, basic_ostream
35 #include <iterator> // for operator!=, reverse_iterator
36 #include <map> // for map<>::const_iterator, map
37 #include <utility> // for pair
38 
39 //using namespace std;
40 
42  : SubsysReco(name)
43 {
44  m_RandomGenerator = gsl_rng_alloc(gsl_rng_mt19937);
45  m_Seed = PHRandomSeed(); // fixed seed is handled in this funtcion
46  gsl_rng_set(m_RandomGenerator, m_Seed);
47  return;
48 }
49 
51 {
52  while (particlelist.begin() != particlelist.end())
53  {
54  delete particlelist.back();
55  particlelist.pop_back();
56  }
57  gsl_rng_free(m_RandomGenerator);
58  return;
59 }
60 
61 int PHG4ParticleGeneratorBase::get_pdgcode(const std::string &name) const
62 {
64  G4ParticleDefinition *particledef = particleTable->FindParticle(name);
65  if (particledef)
66  {
67  return particledef->GetPDGEncoding();
68  }
69  return 0;
70 }
71 
72 std::string
74 {
76  G4ParticleDefinition *particledef = particleTable->FindParticle(pdgcode);
77  if (particledef)
78  {
79  return particledef->GetParticleName();
80  }
81  // if we cannot find the particle definition we'll make it ia geantino
82  return "geantino";
83 }
84 
85 double
86 PHG4ParticleGeneratorBase::get_mass(const int pdgcode) const
87 {
89  G4ParticleDefinition *particledef = particleTable->FindParticle(get_pdgname(pdgcode));
90  if (particledef)
91  {
92  return particledef->GetPDGMass() / GeV;
93  }
94  return 0;
95 }
96 
98 {
100  particlelist[0]->set_name(particle);
101  particlelist[0]->set_pid(get_pdgcode(particle));
102  return;
103 }
104 
106 {
108  particlelist[0]->set_pid(pid);
109 }
110 
111 void PHG4ParticleGeneratorBase::set_mom(const double x, const double y, const double z)
112 {
114  particlelist[0]->set_px(x);
115  particlelist[0]->set_py(y);
116  particlelist[0]->set_pz(z);
117  return;
118 }
119 
120 void PHG4ParticleGeneratorBase::set_vtx(const double x, const double y, const double z)
121 {
122  m_Vtx_x = x;
123  m_Vtx_y = y;
124  m_Vtx_z = z;
125  return;
126 }
127 
129 {
130  PHG4InEvent *ineve = findNode::getClass<PHG4InEvent>(topNode, "PHG4INEVENT");
131  if (!ineve)
132  {
133  PHNodeIterator iter(topNode);
134  PHCompositeNode *dstNode;
135  dstNode = dynamic_cast<PHCompositeNode *>(iter.findFirst("PHCompositeNode", "DST"));
136 
137  ineve = new PHG4InEvent();
138  PHDataNode<PHObject> *newNode = new PHDataNode<PHObject>(ineve, "PHG4INEVENT", "PHObject");
139  dstNode->addNode(newNode);
140  }
141  return 0;
142 }
143 
145 {
146  std::cout << PHWHERE << " " << Name() << " using empty process_event" << std::endl;
147  return 0;
148 }
149 
150 void PHG4ParticleGeneratorBase::PrintParticles(const std::string &/*what*/) const
151 {
152  std::vector<PHG4Particle *>::const_iterator iter;
153  int i = 0;
154  for (iter = particlelist.begin(); iter != particlelist.end(); ++iter)
155  {
156  std::cout << "particle " << i << std::endl;
157  (*iter)->identify();
158  i++;
159  }
160 }
161 
162 void PHG4ParticleGeneratorBase::AddParticle(const std::string &particle, const double x, const double y, const double z)
163 {
164  PHG4Particle *part = new PHG4Particlev1(particle, get_pdgcode(particle), x, y, z);
165  particlelist.push_back(part);
166 }
167 
168 void PHG4ParticleGeneratorBase::AddParticle(const int pid, const double x, const double y, const double z)
169 {
171  particle->set_pid(pid);
172  particle->set_px(x);
173  particle->set_py(y);
174  particle->set_pz(z);
175  particlelist.push_back(particle);
176 }
177 
179 {
180  if (!particlelist.size())
181  {
183  particlelist.push_back(part);
184  }
185  return;
186 }
187 
189 {
190  if ((particle->get_name()).size() == 0) // no size -> empty name string
191  {
192  particle->set_name(get_pdgname(particle->get_pid()));
193  }
194  if (particle->get_pid() == 0)
195  {
196  particle->set_pid(get_pdgcode(particle->get_name()));
197  }
198  if (m_EmbedFlag)
199  {
200  ineve->AddEmbeddedParticle(particle, m_EmbedFlag);
201  }
202  return;
203 }
204 
205 void PHG4ParticleGeneratorBase::set_seed(const unsigned int iseed)
206 {
207  m_Seed = iseed;
208  std::cout << Name() << " random seed: " << m_Seed << std::endl;
209  gsl_rng_set(m_RandomGenerator, m_Seed);
210 }
211 
213 {
215  {
216  return 0;
217  }
218 
219  PHHepMCGenEventMap *genevtmap = findNode::getClass<PHHepMCGenEventMap>(topNode, "PHHepMCGenEventMap");
220 
221  if (genevtmap)
222  {
223  // use the highest priority HepMC subevent's vertex, ie that with highest embedding ID
224 
226  genevtmap->rbegin();
227 
228  if (iter != genevtmap->rend())
229  {
230  const PHHepMCGenEvent *hepmc_evt = iter->second;
231 
232  assert(hepmc_evt);
233 
234  const HepMC::FourVector &vtx = hepmc_evt->get_collision_vertex();
235 
236  set_vtx(vtx.x(), vtx.y(), vtx.z());
237 
238  if (Verbosity() > 0)
239  {
240  std::cout << "PHG4ParticleGeneratorBase::ReuseExistingVertex - reuse PHHepMCGenEventMap vertex "
241  << vtx.x() << ", " << vtx.y() << ", " << vtx.z() << " cm. Source event:"
242  << std::endl;
243  hepmc_evt->identify();
244  }
245 
246  return 1;
247  }
248  }
249 
250  // try PHG4INEVENT
251  PHG4InEvent *ineve = findNode::getClass<PHG4InEvent>(topNode, "PHG4INEVENT");
252 
253  if (ineve->GetNVtx() > 0)
254  {
255  std::pair<std::map<int, PHG4VtxPoint *>::const_iterator,
256  std::map<int, PHG4VtxPoint *>::const_iterator>
257  range = ineve->GetVertices();
258  std::map<int, PHG4VtxPoint *>::const_iterator iter = range.first;
259  PHG4VtxPoint *vtx = iter->second;
260 
261  if (!vtx)
262  {
263  std::cout << PHWHERE << "::Error - PHG4SimpleEventGenerator expects an existing vertex in PHG4InEvent, but none exists" << std::endl;
264  exit(1);
265  }
266  if (Verbosity() > 0)
267  {
268  std::cout << PHWHERE << "::Info - use this primary vertex from PHG4InEvent:" << std::endl;
269  vtx->identify();
270  }
271 
272  set_vtx(vtx->get_x(), vtx->get_y(), vtx->get_z());
273  return 1;
274 
275  } // if (_ineve->GetNVtx() > 0) {
276  // try the next option for getting primary vertex
277 
278  PHG4TruthInfoContainer *truthInfoList = //
279  findNode::getClass<PHG4TruthInfoContainer>(topNode,
280  "G4TruthInfo");
281  if (truthInfoList)
282  {
283  // embed to vertexes as set by primary vertex from the truth container, e.g. when embedding into DST
284 
285  PHG4VtxPoint *vtx = truthInfoList->GetPrimaryVtx(1);
286 
287  if (!vtx)
288  {
289  truthInfoList->identify();
290  std::cout << PHWHERE << "::Error - PHG4SimpleEventGenerator expects an existing truth vertex in PHG4TruthInfoContainer, but none exists"
291  << std::endl;
292  exit(1);
293  }
294 
295  if (Verbosity() > 0)
296  {
297  std::cout << PHWHERE << "::Info - use this primary vertex from PHG4TruthInfoContainer:" << std::endl;
298  vtx->identify();
299  }
300 
301  set_vtx(vtx->get_x(), vtx->get_y(), vtx->get_z());
302  return 1;
303  }
304 
305  // I am out of options.....
306 
307  std::cout << PHWHERE << "::Error we expect an existing truth vertex, but none exists"
308  << std::endl;
309  gSystem->Exit(1);
310 
311  return 0;
312 }
313 
315 {
316  while (particlelist_begin() != particlelist_end())
317  {
318  delete particlelist.back();
319  particlelist.pop_back();
320  }
321  return;
322 }