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[wip] start to integrate TPC pixel readout #316
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * InterpolatedHitGenerator.h | ||
| * | ||
| * Created on: Oct 12, 2016 | ||
| * Author: cligtenb | ||
| */ | ||
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| #ifndef INTERPOLATEDHITGENERATOR_H_ | ||
| #define INTERPOLATEDHITGENERATOR_H_ | ||
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| #include <functional> | ||
| #include <vector> | ||
| #include <cmath> | ||
| #include <algorithm> | ||
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| //geant4 | ||
| #include "G4ThreeVector.hh" //is actually a typedef of CLHEP::ThreeVector | ||
| #include "Randomize.hh"//also CLHEP | ||
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| //root | ||
| #include "TRandom.h" | ||
| #include "TMath.h" | ||
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| struct LinearVectorInterpolation { | ||
| LinearVectorInterpolation( G4ThreeVector x1, G4ThreeVector x2) : | ||
| _x1(x1), | ||
| _x2(x2) | ||
| {} | ||
| G4ThreeVector _x1, _x2; | ||
| G4ThreeVector operator()(double t) { //t is parameter between 0 and 1 | ||
| return _x1+t*(_x2-_x1);//interpolate linearly | ||
| } | ||
| }; | ||
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| struct QuadraticVectorInterpolation { | ||
| //interpolate using momentum at second point | ||
| QuadraticVectorInterpolation( G4ThreeVector x1, G4ThreeVector x2, G4ThreeVector momentum) : | ||
| _x1(x1), | ||
| _x2(x2), | ||
| _mom(momentum) | ||
| {} | ||
| G4ThreeVector _x1, _x2, _mom; | ||
| G4ThreeVector operator()(double t) { //t is parameter between 0 and 1 | ||
| G4ThreeVector vT=(_x2-_x1).mag()*_mom.unit(); | ||
| return _x1+t*(2*(_x2-_x1)-vT)+t*t*(_x1-_x2+vT);//interpolate quadratically | ||
| } | ||
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| }; | ||
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| struct AngleInterpolation { | ||
| //interpolate using momentum at angle between momenta | ||
| AngleInterpolation( G4ThreeVector x1, G4ThreeVector x2, G4ThreeVector p1, G4ThreeVector p2) : | ||
| _x1(x1), | ||
| _x2(x2), | ||
| _u1(p1.unit()), | ||
| _u2(p2.unit()) | ||
| {} | ||
| G4ThreeVector _x1, _x2, _u1, _u2; | ||
| int sign(int x) {return x < 0 ? -1 : 1; } | ||
| G4ThreeVector operator()(double t) { //t is parameter between 0 and 1 | ||
| G4ThreeVector pos {_x1}; | ||
| G4ThreeVector difference {_x2-_x1}; | ||
| //start with linear base | ||
| G4ThreeVector relativePos=t*difference; | ||
| //add dS factor in XY plane: | ||
| double dphi=_u1.deltaPhi(_u2); //phi difference between vectors | ||
| double L=difference.perp(); //point to point distance in XY plane | ||
| double dS=L/2*sin(dphi/2)/2; | ||
| //G4cout<<"ds="<<dS<<" L="<<L<<G4endl; | ||
| G4ThreeVector dSPos; | ||
| dSPos.setRhoPhiZ( | ||
| 4*abs(dS)*t*(1-t), //quadratic function in t | ||
| difference.phi()-sign(dS)*M_PI/2, //orthogonal to difference | ||
| 0); | ||
| return pos+relativePos+dSPos; | ||
| } | ||
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| }; | ||
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| //Produce a new hit at each location with a given chance; | ||
| struct FlatMultipleHitFunction { | ||
| std::vector<double> recurrenceChance={0.1}; | ||
| double previous=CLHEP::HepRandom::getTheEngine()->flat(); | ||
| int multiplicity=0; | ||
| FlatMultipleHitFunction(double p) : recurrenceChance(1,p) {} | ||
| FlatMultipleHitFunction(std::vector<double> p) : recurrenceChance(p) {} | ||
| double operator() (int) { | ||
| if(CLHEP::HepRandom::getTheEngine()->flat()<recurrenceChance.at(multiplicity)) { | ||
| if(unsigned(multiplicity)<recurrenceChance.size()-1) ++multiplicity; | ||
| return previous; | ||
| } else { | ||
| multiplicity=0; | ||
| return previous=CLHEP::HepRandom::getTheEngine()->flat(); | ||
| } | ||
| } | ||
| }; | ||
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| struct FlatHitFunction : FlatMultipleHitFunction { | ||
| FlatHitFunction() : FlatMultipleHitFunction(0) {}; | ||
| }; | ||
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| struct LandauBasedHitFunction { | ||
| double mu, sigma; | ||
| int nhit=0; | ||
| double t; | ||
| LandauBasedHitFunction(double mu, double sigma) : mu(mu), sigma(sigma) {}; | ||
| double operator() (int) { | ||
| if(nhit<=0) { | ||
| while ( !(nhit=int(gRandom->Landau(mu, sigma))) ) {};//draw number until different from zero | ||
| t=CLHEP::HepRandom::getTheEngine()->flat(); | ||
| } | ||
| --nhit; | ||
| return t; | ||
| } | ||
| }; | ||
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| //generate a y=x like distribution for the number of hits | ||
| struct TriangularHitFunction { | ||
| double triangleFraction; | ||
| int nHitAtSame=0; | ||
| double t=0; | ||
| TriangularHitFunction(double triangleFraction=0.1) : triangleFraction(triangleFraction) {} | ||
| double operator() (int nHitRemaining) { | ||
| if(nHitAtSame<=0) { | ||
| double y=0;//under treshold is poisson=always one hit | ||
| // if(nHitRemaining<treshold) { | ||
| // if(nHitRemaining>10) { | ||
| // nHitAtSame=1; | ||
| // } | ||
| // const int startTrans=10; //treshold = slope length | ||
| // if(gRandom->Rndm() < double(nHitRemaining-startTrans)/treshold ) { | ||
| if(gRandom->Rndm() < triangleFraction) { // chance on generating a triangular dist | ||
| // if(nHitRemaining>treshold){ | ||
| // y=1; | ||
| y=TMath::Sqrt( gRandom->Rndm() );//y is a triangle between 0 and 1 | ||
| // y= gRandom->Rndm() ;//flat instead! | ||
| } | ||
| const int minHits=0; //fix to 1? | ||
| nHitAtSame=int(minHits+(nHitRemaining-minHits)*y); | ||
| t=gRandom->Rndm(); | ||
| } | ||
| --nHitAtSame; | ||
| return t; | ||
| } | ||
| }; | ||
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| class InterpolatedHitGenerator { | ||
| public: | ||
| InterpolatedHitGenerator( | ||
| std::function<double(int)> hitDistributionFunction, //e.g. [](int) { return CLHEP::HepRandom::getTheEngine()->flat(); } | ||
| std::function<G4ThreeVector(double)> hitLocationFunction); //e.g. LinearVectorInterpolation(x1,x2); | ||
| std::vector<G4ThreeVector> generateHits(int nHits); | ||
| std::vector<G4ThreeVector> interpolateHits(std::function<G4ThreeVector>); | ||
| std::vector<G4ThreeVector> generateFromFunction( | ||
| const std::function<G4ThreeVector(double)>& vectorFunction); | ||
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| protected: | ||
| std::function<double(int)> _getHitDistribution; //return parameter between 0.-1, for location on track, takes number of remaining hits as parameter | ||
| std::function<G4ThreeVector(double)> _getHitLocation; | ||
| std::vector<double> _param; //param saves parameter used to generate hits such that the corresponding momentum can later be found. | ||
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| }; | ||
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| InterpolatedHitGenerator::InterpolatedHitGenerator( | ||
| std::function<double(int)> hitDistributionFunction, | ||
| std::function<G4ThreeVector(double)> hitLocationFunction) : | ||
| _getHitDistribution(hitDistributionFunction), | ||
| _getHitLocation(hitLocationFunction) | ||
| {} | ||
|
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| std::vector<G4ThreeVector> InterpolatedHitGenerator::generateFromFunction( | ||
| const std::function<G4ThreeVector(double)>& vectorFunction) { | ||
| //generate hits | ||
| std::vector<G4ThreeVector> hits; | ||
| hits.reserve(_param.size()); | ||
| for (double t : _param) { | ||
| hits.push_back(vectorFunction(t)); | ||
| } | ||
| return hits; | ||
| } | ||
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| std::vector<G4ThreeVector> InterpolatedHitGenerator::generateHits(int nHits) { | ||
| //first generate the parameter, such that hits can be easily placed in order | ||
| _param.reserve(nHits); | ||
| for(int i=0; i<nHits; i++) { | ||
| _param.push_back( _getHitDistribution(nHits-i) ); | ||
| } | ||
| //sort | ||
| std::sort(_param.begin(), _param.end()); | ||
| //generate hits | ||
| std::vector<G4ThreeVector> hits = generateFromFunction(_getHitLocation); | ||
| return hits; | ||
| } | ||
|
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| #endif /* INTERPOLATEDHITGENERATOR_H_ */ |
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This should come through filters in ddsim, and not here in the geometry.