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//--------------------------------------------------------------------------------------------------
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// $Id: MatchingTools.h,v 1.2 2009/05/18 06:31:23 loizides Exp $
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//
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// MatchingTools
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//
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// This class implements a couple of simple geometrical matching functions.
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//
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// Authors: C.Loizides
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//--------------------------------------------------------------------------------------------------
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#ifndef MITPHYSICS_UTILS_MATCHINGTOOLS_H
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#define MITPHYSICS_UTILS_MATCHINGTOOLS_H
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#include <TObjArray.h>
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#include <TMath.h>
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#include "MitCommon/MathTools/interface/MathUtils.h"
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#include "MitAna/DataCont/interface/Collection.h"
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namespace mithep
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{
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class MatchingTools {
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public:
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template<class V1, class V2>
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static const V2 *Closest(const V1 *v1, const Collection<V2> &col, Double_t maxR,
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Bool_t self=kFALSE);
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template<class V1, class V2>
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static const V2 *ClosestRPt(const V1 *v1, const Collection<V2> &col, Double_t max,
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Bool_t self=kFALSE);
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template<class V1, class V2>
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static TObjArray *Closests(const V1 *v1, const Collection<V2> &col, Double_t maxR,
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Bool_t self=kFALSE);
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};
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//------------------------------------------------------------------------------------------------
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template<class V1, class V2>
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const V2 *MatchingTools::Closest(const V1 *v1, const Collection<V2> &col, Double_t maxR,
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Bool_t self)
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{
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// Return closest geometrical neighbor in eta-phi within maximum delta R of maxR.
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// If self is kFALSE make sure that identical pointers are excluded.
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if (!v1)
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return 0;
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const V2 *res = 0;
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const UInt_t ents = col.GetEntries();
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if (ents>0) {
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Double_t dR = 1e30;
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for (UInt_t i = 0; i<ents; ++i) {
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const V2 *v2 = col.At(i);
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if (!v2)
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continue;
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if (!self && (void*)v1==(void*)v2)
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continue;
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Double_t diff = MathUtils::DeltaR(*v1,*v2);
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if ((diff<maxR) && (diff<dR)) {
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res = v2;
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dR = diff;
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}
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}
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}
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return res;
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}
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//------------------------------------------------------------------------------------------------
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template<class V1, class V2>
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const V2 *MatchingTools::ClosestRPt(const V1 *v1, const Collection<V2> &col, Double_t max,
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Bool_t self)
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{
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// Return closest geometrical neighbor in eta-phi-pt within maximum delta of max.
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// If self is kFALSE make sure that identical pointers are excluded.
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if (!v1)
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return 0;
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const V2 *res = 0;
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const UInt_t ents = col.GetEntries();
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if (ents>0) {
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Double_t d = 1e30;
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for (UInt_t i = 0; i<ents; ++i) {
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const V2 *v2 = col.At(i);
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if (!v2)
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continue;
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if (!self && (void*)v1==(void*)v2)
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continue;
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Double_t diff = MathUtils::DeltaR2(*v1,*v2);
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Double_t ptd = 1-v1->Pt()/v2->Pt();
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diff += ptd*ptd;
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diff = TMath::Sqrt(diff);
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if ((diff<max) && (diff<d)) {
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res = v2;
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d = diff;
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}
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}
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}
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return res;
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}
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//------------------------------------------------------------------------------------------------
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template<class V1, class V2>
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TObjArray *MatchingTools::Closests(const V1 *v1, const Collection<V2> &col, Double_t maxR,
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Bool_t self)
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{
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// Return closest geometrical neighbors in eta-phi within maximum delta R of maxR.
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// If self is kFALSE make sure that identical pointers are excluded.
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if (!v1)
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return 0;
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TObjArray *res = new TObjArray;
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res->SetOwner(kFALSE);
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const UInt_t ents = col.GetEntries();
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for (UInt_t i = 0; i<ents; ++i) {
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const V2 *v2 = col.At(i);
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if (!v2)
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continue;
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if (!self && (void*)v1==(void*)v2)
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continue;
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Double_t diff = MathUtils::DeltaR(*v1,*v2);
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if (diff<maxR)
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res->Add(const_cast<V2*>(v2));
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}
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return res;
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}
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}
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#endif
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