In AEvent class the point where front fit crosses zero level (fTimeFront) is added

convertRawToAnalyzed/analyse.cpp

@@ -86,7 +86,7 @@ int main(int argc, char* argv[])
 
 	for(Long64_t i = 0; i < nentries; i++) {
 		tr->GetEntry(i);
-		//cout<<" i "<<i<<endl;
+		//cout<<" Event "<<i<<endl;
 		for (Int_t j = 0; j<noBranches; j++) {
 			wevent[j]->Reset();
 			wevent[j]->ProcessEvent();	//here all the analysis is going on so far

dataClasses/AEvent.cpp

@@ -81,6 +81,7 @@ void AEvent::Reset() {
 	fZeroLevel = 0.;
 	fChargeCFD = -10.;
 	fChargeLED = -10.;
+	fTimeFront = -100.;
 }
 
 void AEvent::SetInputEvent(RawEvent** event) {
@@ -173,6 +174,7 @@ void AEvent::FindFrontProperties() {
 
 	const Double_t timeStep = 0.05;	//in ns
 	Double_t time = 0;			//in ns
+	Double_t mytime = 0.;
 
 	if (!fGraphSignal) {
 		Warning("AEvent::FindFrontProperties", "Graph was not set");
@@ -196,9 +198,28 @@ void AEvent::FindFrontProperties() {
 	fit1->SetRange(fTime10,fTime90);
 
 	fGraphSignal->Fit(fit1,"RQN","goff");
+
 	fEdgeSlope = fit1->GetParameter(1);
 	fEdgeXi = fit1->GetChisquare();
 
+	//adding point where fit function crosses zero
+	Double_t a = 0, b = 0;
+	TF1 *line = new TF1("line","[1]*x + [0]");
+	a = fit1->GetParameter(1);
+	b = fit1->GetParameter(0);
+	line->SetParameter(0,b);
+	line->SetParameter(1,a);	
+	//cout<<"par 0 "<<b<<endl;
+	//cout<<"par 1 "<<a<<endl;
+
+	if( a!= 0. && b!= 0. ) {	//in case of fit data is empty
+		while(line->Eval(mytime) <= 0 && mytime <= 200.) {	
+			//cout<< "mytime "<<mytime<<endl;
+			fTimeFront = mytime;
+			mytime = mytime + timeStep;
+		}
+	}
+
 	delete fit1;
 }
 

dataClasses/AEvent.h

@@ -50,6 +50,7 @@ private:
 	Double_t fChargeLED;	//charge of the signal in Coulomb
 
 	Double_t fTimeLED;	//time of LED threshold crossing
+	Double_t fTimeFront;	//time of front fit crossing zero level
 
 	TGraph *fGraphSignal;
 	TGraph *fGraphCFD;