//=============================================================================
// GetStartPosition
// is_vertex must be "true" when the vert is muon vertex
// is_vertex must be "false" when the vert is for reference
//=============================================================================
bool HTBlob::GetStartPosition( Minerva::IDBlob *idBlob, Gaudi::XYZPoint vert, bool is_vertex ) const
{
debug() << " HTBlob::GetStartPosition " << endmsg;
TH2D *hU = new TH2D ( "hU", "hU", 480,4510,9990,127,-1075,1075);
TH2D *hV = new TH2D ( "hV", "hV", 480,4510,9990,127,-1075,1075);
if ( is_vertex ){
hU->Fill( vert.z(), m_mathTool->calcUfromXY(vert.x(), vert.y()), 20 );
hV->Fill( vert.z(), m_mathTool->calcVfromXY(vert.x(), vert.y()), 20);
}
SmartRefVector<Minerva::IDCluster> idClusters = idBlob->clusters();
SmartRefVector<Minerva::IDCluster>::iterator itClus = idClusters.begin();
Gaudi::XYZPoint pos;
double Dx = 0.0;
double Dz = 0.0;
double distance = 0.0;
double vt_x = -9999;
double vt_u;
double vt_v;
double vt_z = -9999;
double vtX = -9999;
double vtY = -9999;
double vtZ = -9999;
double dis_min_x = 10000;
double xu[2] = {0.0};
double xv[2] = {0.0};
double zu[2] = {0.0};
double zv[2] = {0.0}; // to NC Pi0 events, there is no muon vertex
int countu = 0;
int countv = 0; // to NC Pi0 events, there is no muon vertex
for ( ; itClus != idClusters.end(); itClus++ ){
Dx = (*itClus)->position() - vert.x();
Dz = (*itClus)->z() - vert.z();// to avoid 0
if( (*itClus)->view()== Minerva::IDCluster::X ) {
distance = sqrt( pow(Dx,2) + pow(Dz,2) );
if (distance <= dis_min_x ) {
dis_min_x = distance;
vt_x = (*itClus)->position();
vt_z = (*itClus)->z();
}
}
if( (*itClus)->view()== Minerva::IDCluster::U ){
debug() << " StartPoint U view, pe " << (*itClus)->pe() << "; z = " << (*itClus)->z()
<< "; coord " << (*itClus)->position() << endmsg;
Dx = (*itClus)->position() - m_mathTool->calcUfromXY(vert.x(),vert.y());
distance = sqrt( pow(Dx,2) + pow(Dz,2) );
if ( is_vertex ) {
hU->Fill( (*itClus)->z()-12,(*itClus)->tpos1(), (*itClus)->pe()/distance );
hU->Fill( (*itClus)->z()+12,(*itClus)->tpos2(), (*itClus)->pe()/distance );
}
hU->Fill( (*itClus)->z(),(*itClus)->position(), (*itClus)->pe()/distance );
if ( countu < 2 ){
zu[countu] = (*itClus)->z();
xu[countu] = (*itClus)->position();
countu++;
}
}
if( (*itClus)->view()== Minerva::IDCluster::V ){
debug() << " StartPoint V view, pe " << (*itClus)->pe() << "; z = " << (*itClus)->z()
<< "; coord " << (*itClus)->position() << endmsg;
Dx = (*itClus)->position() - m_mathTool->calcVfromXY(vert.x(),vert.y());
distance = sqrt( pow(Dx,2) + pow(Dz,2) );
if ( is_vertex ){
hV->Fill( (*itClus)->z()-12,(*itClus)->tpos1(), (*itClus)->pe()/distance );
hV->Fill( (*itClus)->z()+12,(*itClus)->tpos2(), (*itClus)->pe()/distance );
}
hV->Fill( (*itClus)->z(),(*itClus)->position(), (*itClus)->pe()/distance );
if ( countv < 2 ){
zv[countu] = (*itClus)->z();
xv[countu] = (*itClus)->position();
countv++;
}
}
}
TF1 *fU, *fV;
double slopeu = -9999;
double slopev = -9999;
double bu = -9999;
double bv = -9999;
bool goodFit_U = false;
bool goodFit_V = false;
if ( hU->GetEntries() > 3 ){
hU->Fit("pol1","Q0");
fU = hU->GetFunction("pol1");
bu = fU->GetParameter(0);
slopeu = fU->GetParameter(1);
goodFit_U = true;
delete fU;
}
else if ( hU->GetEntries() == 2 ){ // to deal with 2 clusters on NCPi0
if ( zu[0] > zu[1] ){
slopeu = (xu[0] - xu[1]) / (zu[0] - zu[1]);
bu = xu[1] - zu[1]*slopeu;
goodFit_U = true;
}
else if (zu[0] < zu[1] ) {
slopeu = (xu[1] - xu[0]) / (zu[1] - zu[0]);
bu = xu[0] - zu[0]*slopeu;
goodFit_U = true;
}
}
if ( hV->GetEntries() > 3 ){
hV->Fit("pol1","Q0");
fV = hV->GetFunction("pol1");
bv = fV->GetParameter(0);
slopev = fV->GetParameter(1);
goodFit_V = true;
delete fV;
}
else if ( hV->GetEntries() == 2 ){ // to deal with 2 clusters on NCPi0
if ( zv[0] > zv[1] ){
slopev = (xv[0] - xv[1]) / (zv[0] - zv[1]);
bv = xv[1] - zv[1]*slopeu;
goodFit_V = true;
}
else if (zu[1] < zu[0] ) { /* Trung: why zu instead of zv? */
slopev = (xv[1] - xv[0]) / (zv[1] - zv[0]);
bv = xv[0] - zv[0]*slopev;
goodFit_V = true;
}
}
vtX = vt_x;
vtZ = vt_z;
debug() << " Startpoint, slope u " << slopeu << " slope v" << slopev << endmsg;
if ( goodFit_U && goodFit_V ){ //3D blobs
vt_u = slopeu*vt_z + bu;
vt_v = slopev*vt_z + bv;
vtY = m_mathTool->calcYfromUV(vt_u,vt_v);
}
else if ( goodFit_U ) { //2D blobs
vt_u = slopeu*vt_z + bu;
vtY = (vt_x*.5 - vt_u)*2/sqrt(3); //calcYfromXU?
}
else if ( goodFit_V ) { //2D blobs
vt_v = slopev*vt_z + bv;
vtY = (vt_v - vt_x*.5)*2/sqrt(3); //calcYfromXV?
}
pos.SetX(vtX); pos.SetY(vtY); pos.SetZ(vtZ);
idBlob->setStartPoint(pos);
debug() << " Setting StarPoint " << pos << " Blob" << idBlob << endmsg;
delete hU;
delete hV;
if (goodFit_U || goodFit_V) return true;
return false;
}
