// @(#)root/eve:$Id$
// Authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007

/*************************************************************************
 * Copyright (C) 1995-2007, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/


#include "TEveTrackPropagator.h"
#include "TEveTrack.h"
#include "TEveTrans.h"

#include "TMath.h"

#include <cassert>

//==============================================================================
// TEveMagFiled classes -- documentation only
//==============================================================================

//______________________________________________________________________________
//
// Abstract base-class for interfacing to magnetic field needed by the
// TEveTrackPropagator.
// See sub-classes for two simple implementations.
//
// NOTE: Magnetic field direction convention is inverted.

ClassImp(TEveMagField);

//______________________________________________________________________________
//
// Implements constant magnetic field, given by a vector fB.
//
// NOTE: Magnetic field direction convention is inverted.

ClassImp(TEveMagFieldConst);

//______________________________________________________________________________
//
// Implements constant magnetic filed that switches on given axial radius fR2
// from vector fBIn to fBOut.
//
// NOTE: Magnetic field direction convention is inverted.

ClassImp(TEveMagFieldDuo);


//==============================================================================

namespace
{
   //const Double_t kBMin     = 1e-6;
   const Double_t kPtMinSqr = 1e-20;
   const Double_t kAMin     = 1e-10;
   const Double_t kStepEps  = 1e-3;
}

//______________________________________________________________________________
TEveTrackPropagator::Helix_t::Helix_t() :
   fCharge(0),
   fMaxAng(45), fMaxStep(20.f), fDelta(0.1),
   fPhi(0), fValid(kFALSE),
   fLam(-1), fR(-1), fPhiStep(-1), fSin(-1), fCos(-1),
   fRKStep(20.0),
   fPtMag(-1), fPlMag(-1), fLStep(-1)
{
   // Default constructor.
}

//______________________________________________________________________________
void TEveTrackPropagator::Helix_t::UpdateCommon(const TEveVectorD& p, const TEveVectorD& b)
{
   // Common update code for helix and RK propagation.

   fB = b;

   // base vectors
   fE1 = b;
   fE1.Normalize();
   fPlMag = p.Dot(fE1);
   fPl    = fE1*fPlMag;

   fPt    = p - fPl;
   fPtMag = fPt.Mag();
   fE2    = fPt;
   fE2.Normalize();
}

//______________________________________________________________________________
void TEveTrackPropagator::Helix_t::UpdateHelix(const TEveVectorD& p, const TEveVectorD& b,
                                               Bool_t full_update, Bool_t enforce_max_step)
{
   // Update helix parameters.

   UpdateCommon(p, b);

   // helix parameters
   TMath::Cross(fE1.Arr(), fE2.Arr(), fE3.Arr());
   if (fCharge < 0) fE3.NegateXYZ();

   if (full_update)
   {
      using namespace TMath;
      Double_t a = fgkB2C * b.Mag() * Abs(fCharge);
      if (a > kAMin && fPtMag*fPtMag > kPtMinSqr)
      {
         fValid = kTRUE;

         fR   = Abs(fPtMag / a);
         fLam = fPlMag / fPtMag;

         // get phi step, compare fMaxAng with fDelta
         fPhiStep = fMaxAng * DegToRad();
         if (fR > fDelta)
         {
            Double_t ang  = 2.0 * ACos(1.0f - fDelta/fR);
            if (ang < fPhiStep)
               fPhiStep = ang;
         }

         // check max step size
         Double_t curr_step = fR * fPhiStep * Sqrt(1.0f + fLam*fLam);
         if (curr_step > fMaxStep || enforce_max_step)
            fPhiStep *= fMaxStep / curr_step;

         fLStep = fR * fPhiStep * fLam;
         fSin   = Sin(fPhiStep);
         fCos   = Cos(fPhiStep);
      }
      else
      {
         fValid = kFALSE;
      }
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::Helix_t::UpdateRK(const TEveVectorD& p, const TEveVectorD& b)
{
   // Update helix for stepper RungeKutta.

   UpdateCommon(p, b);

   if (fCharge)
   {
      fValid = kTRUE;

      // cached values for propagator
      fB = b;
      fPlMag = p.Dot(fB);
   }
   else
   {
      fValid = kFALSE;
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::Helix_t::Step(const TEveVector4D& v, const TEveVectorD& p,
                                        TEveVector4D& vOut, TEveVectorD& pOut)
{
   // Step helix for given momentum p from vertex v.

   vOut = v;

   if (fValid)
   {
      TEveVectorD d = fE2*(fR*fSin) + fE3*(fR*(1-fCos)) + fE1*fLStep;
      vOut    += d;
      vOut.fT += TMath::Abs(fLStep);

      pOut = fPl + fE2*(fPtMag*fCos) + fE3*(fPtMag*fSin);

      fPhi += fPhiStep;
   }
   else
   {
      // case: pT < kPtMinSqr or B < kBMin
      // might happen if field directon changes pT ~ 0 or B becomes zero
      vOut    += p * (fMaxStep / p.Mag());
      vOut.fT += fMaxStep;
      pOut  = p;
   }
}


//==============================================================================
// TEveTrackPropagator
//==============================================================================

//______________________________________________________________________________
//
// Holding structure for a number of track rendering parameters.
// Calculates path taking into account the parameters.
//
// NOTE: Magnetic field direction convention is inverted.
//
// This is decoupled from TEveTrack/TEveTrackList to allow sharing of the
// Propagator among several instances. Back references are kept so the tracks
// can be recreated when the parameters change.
//
// TEveTrackList has Get/Set methods for RnrStlye. TEveTrackEditor and
// TEveTrackListEditor provide editor access.
//
// Enum EProjTrackBreaking_e and member fProjTrackBreaking specify whether 2D
// projected tracks get broken into several segments when the projected space
// consists of separate domains (like Rho-Z). The track-breaking is enabled by
// default.
//

ClassImp(TEveTrackPropagator);

Double_t             TEveTrackPropagator::fgDefMagField = 0.5;
const Double_t       TEveTrackPropagator::fgkB2C        = 0.299792458e-2;
TEveTrackPropagator  TEveTrackPropagator::fgDefault;

Double_t             TEveTrackPropagator::fgEditorMaxR  = 2000;
Double_t             TEveTrackPropagator::fgEditorMaxZ  = 4000;

//______________________________________________________________________________
TEveTrackPropagator::TEveTrackPropagator(const char* n, const char* t,
                                         TEveMagField *field, Bool_t own_field) :
   TEveElementList(n, t),
   TEveRefBackPtr(),

   fStepper(kHelix),
   fMagFieldObj(field),
   fOwnMagFiledObj(own_field),

   fMaxR    (350),   fMaxZ    (450),
   fNMax    (4096),  fMaxOrbs (0.5),

   fEditPathMarks (kTRUE),
   fFitDaughters  (kTRUE),   fFitReferences (kTRUE),
   fFitDecay      (kTRUE),
   fFitCluster2Ds (kTRUE),   fFitLineSegments (kTRUE),
   fRnrDaughters  (kFALSE),  fRnrReferences (kFALSE),
   fRnrDecay      (kFALSE),  fRnrCluster2Ds (kFALSE),
   fRnrFV         (kFALSE),
   fPMAtt(), fFVAtt(),

   fProjTrackBreaking(kPTB_Break), fRnrPTBMarkers(kFALSE), fPTBAtt(),

   fV()
{
   // Default constructor.

   fPMAtt.SetMarkerColor(kYellow);
   fPMAtt.SetMarkerStyle(2);
   fPMAtt.SetMarkerSize(2);

   fFVAtt.SetMarkerColor(kRed);
   fFVAtt.SetMarkerStyle(4);
   fFVAtt.SetMarkerSize(1.5);

   fPTBAtt.SetMarkerColor(kBlue);
   fPTBAtt.SetMarkerStyle(4);
   fPTBAtt.SetMarkerSize(0.8);

   if (fMagFieldObj == 0) {
      fMagFieldObj = new TEveMagFieldConst(0., 0., fgDefMagField);
      fOwnMagFiledObj = kTRUE;
   }
}

//______________________________________________________________________________
TEveTrackPropagator::~TEveTrackPropagator()
{
   // Destructor.

   if (fOwnMagFiledObj)
   {
      delete fMagFieldObj;
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::OnZeroRefCount()
{
   // Virtual from TEveRefBackPtr - track reference count has reached zero.

   CheckReferenceCount("TEveTrackPropagator::OnZeroRefCount ");
}

//______________________________________________________________________________
void TEveTrackPropagator::CheckReferenceCount(const TEveException& eh)
{
   // Check reference count - virtual from TEveElement.
   // Must also take into account references from TEveRefBackPtr.

   if (fRefCount <= 0)
   {
      TEveElementList::CheckReferenceCount(eh);
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::ElementChanged(Bool_t update_scenes, Bool_t redraw)
{
   // Element-change notification.
   // Stamp all tracks as requiring display-list regeneration.
   // Virtual from TEveElement.

   TEveTrack* track;
   RefMap_i i = fBackRefs.begin();
   while (i != fBackRefs.end())
   {
      track = dynamic_cast<TEveTrack*>(i->first);
      track->StampObjProps();
      ++i;
   }
   TEveElementList::ElementChanged(update_scenes, redraw);
}

//==============================================================================

//______________________________________________________________________________
void TEveTrackPropagator::InitTrack(const TEveVectorD &v, Int_t charge)
{
   // Initialize internal data-members for given particle parameters.

   fV = v;
   fPoints.push_back(fV);

   // init helix
   fH.fPhi    = 0;
   fH.fCharge = charge;
}

//______________________________________________________________________________
void TEveTrackPropagator::InitTrack(const TEveVectorF& v, Int_t charge)
{
   // TEveVectorF wrapper.

   TEveVectorD vd(v);
   InitTrack(vd, charge);
}

//______________________________________________________________________________
void TEveTrackPropagator::ResetTrack()
{
   // Reset cache holding particle trajectory.

   fPoints.clear();

   // reset helix
   fH.fPhi = 0;
}

//______________________________________________________________________________
Int_t TEveTrackPropagator::GetCurrentPoint() const
{
   // Get index of current point on track.

   return fPoints.size() - 1;
}

//______________________________________________________________________________
Double_t TEveTrackPropagator::GetTrackLength(Int_t start_point, Int_t end_point) const
{
   // Calculate track length from start_point to end_point.
   // If end_point is less than 0, distance to the end is returned.

   if (end_point < 0) end_point = fPoints.size() - 1;

   Double_t sum = 0;
   for (Int_t i = start_point; i < end_point; ++i)
   {
      sum += (fPoints[i+1] - fPoints[i]).Mag();
   }
   return sum;
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::GoToVertex(TEveVectorD& v, TEveVectorD& p)
{
   // Propagate particle with momentum p to vertex v.

   Update(fV, p, kTRUE);

   if ((v-fV).Mag() < kStepEps)
   {
      fPoints.push_back(v);
      return kTRUE;
   }

   return fH.fValid ? LoopToVertex(v, p) : LineToVertex(v);
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::GoToLineSegment(const TEveVectorD& s, const TEveVectorD& r, TEveVectorD& p)
{
   // Propagate particle with momentum p to line with start point s and vector r to the second point.

   Update(fV, p, kTRUE);

   if (!fH.fValid)
   {
      TEveVectorD v;
      ClosestPointBetweenLines(s, r, fV, p, v);
      LineToVertex(v);
      return kTRUE;
   }
   else
   {
      return LoopToLineSegment(s, r, p);
   }
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::GoToVertex(TEveVectorF& v, TEveVectorF& p)
{
   // TEveVectorF wrapper.

   TEveVectorD vd(v), pd(p);
   Bool_t result = GoToVertex(vd, pd);
   v = vd; p = pd;
   return result;
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::GoToLineSegment(const TEveVectorF& s, const TEveVectorF& r, TEveVectorF& p)
{
   // TEveVectorF wrapper.

   TEveVectorD sd(s), rd(r), pd(p);
   Bool_t result = GoToLineSegment(sd, rd, pd);
   p = pd;
   return result;
}

//______________________________________________________________________________
void TEveTrackPropagator::GoToBounds(TEveVectorD& p)
{
   // Propagate particle to bounds.
   // Return TRUE if hit bounds.

   Update(fV, p, kTRUE);

   fH.fValid ? LoopToBounds(p): LineToBounds(p);
}

//______________________________________________________________________________
void TEveTrackPropagator::GoToBounds(TEveVectorF& p)
{
   // TEveVectorF wrapper.

   TEveVectorD pd(p);
   GoToBounds(pd);
   p = pd;
}

//______________________________________________________________________________
void TEveTrackPropagator::Update(const TEveVector4D& v, const TEveVectorD& p,
                                 Bool_t full_update, Bool_t enforce_max_step)
{
   // Update helix / B-field projection state.

   if (fStepper == kHelix)
   {
      fH.UpdateHelix(p, fMagFieldObj->GetFieldD(v), !fMagFieldObj->IsConst() || full_update, enforce_max_step);
   }
   else
   {
      fH.UpdateRK(p, fMagFieldObj->GetFieldD(v));

      if (full_update)
      {
         using namespace TMath;

         Float_t a = fgkB2C * fMagFieldObj->GetMaxFieldMagD() * Abs(fH.fCharge);
	 if (a > kAMin)
	 {
            fH.fR = p.Mag() / a;

            // get phi step, compare fDelta with MaxAng
            fH.fPhiStep = fH.fMaxAng * DegToRad();
            if (fH.fR > fH.fDelta )
            {
               Double_t ang  = 2.0 * ACos(1.0f - fH.fDelta/fH.fR);
               if (ang < fH.fPhiStep)
                  fH.fPhiStep = ang;
            }

            // check against maximum step-size
            fH.fRKStep = fH.fR * fH.fPhiStep * Sqrt(1 + fH.fLam*fH.fLam);
            if (fH.fRKStep > fH.fMaxStep || enforce_max_step)
            {
               fH.fPhiStep *= fH.fMaxStep / fH.fRKStep;
               fH.fRKStep   = fH.fMaxStep;
            }
	 }
	 else
	 {
            fH.fRKStep = fH.fMaxStep;
	 }
      }
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::Step(const TEveVector4D &v, const TEveVectorD &p, TEveVector4D &vOut, TEveVectorD &pOut)
{
   // Wrapper to step helix.

   if (fStepper == kHelix)
   {
      fH.Step(v, p, vOut, pOut);
   }
   else
   {
      Double_t vecRKIn[7];
      vecRKIn[0] = v.fX;
      vecRKIn[1] = v.fY;
      vecRKIn[2] = v.fZ;
      Double_t pm = p.Mag();
      Double_t nm = 1.0 / pm;
      vecRKIn[3] = p.fX*nm;
      vecRKIn[4] = p.fY*nm;
      vecRKIn[5] = p.fZ*nm;
      vecRKIn[6] = p.Mag();

      Double_t vecRKOut[7];
      StepRungeKutta(fH.fRKStep, vecRKIn, vecRKOut);

      vOut.fX = vecRKOut[0];
      vOut.fY = vecRKOut[1];
      vOut.fZ = vecRKOut[2];
      vOut.fT = v.fT + fH.fRKStep;
      pm = vecRKOut[6];
      pOut.fX = vecRKOut[3]*pm;
      pOut.fY = vecRKOut[4]*pm;
      pOut.fZ = vecRKOut[5]*pm;
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::LoopToBounds(TEveVectorD& p)
{
   // Propagate charged particle with momentum p to bounds.
   // It is expected that Update() with full-update was called before.

   const Double_t maxRsq = fMaxR*fMaxR;

   TEveVector4D currV(fV);
   TEveVector4D forwV(fV);
   TEveVectorD  forwP (p);

   Int_t np = fPoints.size();
   Double_t maxPhi = fMaxOrbs*TMath::TwoPi();

   while (fH.fPhi < maxPhi && np<fNMax)
   {
      Step(currV, p, forwV, forwP);

      // cross R
      if (forwV.Perp2() > maxRsq)
      {
         Float_t t = (fMaxR - currV.R()) / (forwV.R() - currV.R());
         if (t < 0 || t > 1)
         {
            Warning("HelixToBounds", "In MaxR crossing expected t>=0 && t<=1: t=%f, r1=%f, r2=%f, MaxR=%f.",
                    t, currV.R(), forwV.R(), fMaxR);
            return;
         }
         TEveVectorD d(forwV);
         d -= currV;
         d *= t;
         d += currV;
         fPoints.push_back(d);
         return;
      }

      // cross Z
      else if (TMath::Abs(forwV.fZ) > fMaxZ)
      {
         Double_t t = (fMaxZ - TMath::Abs(currV.fZ)) / TMath::Abs((forwV.fZ - currV.fZ));
         if (t < 0 || t > 1)
         {
            Warning("HelixToBounds", "In MaxZ crossing expected t>=0 && t<=1: t=%f, z1=%f, z2=%f, MaxZ=%f.",
                    t, currV.fZ, forwV.fZ, fMaxZ);
            return;
         }
         TEveVectorD d(forwV -currV);
         d *= t;
         d += currV;
         fPoints.push_back(d);
         return;
      }

      currV = forwV;
      p     = forwP;
      Update(currV, p);

      fPoints.push_back(currV);
      ++np;
   }
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::LoopToVertex(TEveVectorD& v, TEveVectorD& p)
{
   // Propagate charged particle with momentum p to vertex v.
   // It is expected that Update() with full-update was called before.

   const Double_t maxRsq = fMaxR * fMaxR;

   TEveVector4D currV(fV);
   TEveVector4D forwV(fV);
   TEveVectorD  forwP(p);

   Int_t first_point = fPoints.size();
   Int_t np          = first_point;

   Double_t prod0=0, prod1;

   do
   {
      Step(currV, p, forwV, forwP);
      Update(forwV, forwP);

      if (PointOverVertex(v, forwV, &prod1))
      {
         break;
      }

      if (IsOutsideBounds(forwV, maxRsq, fMaxZ))
      {
         fV = currV;
         return kFALSE;
      }

      fPoints.push_back(forwV);
      currV = forwV;
      p     = forwP;
      prod0 = prod1;
      ++np;
   } while (np < fNMax);

   // make the remaining fractional step
   if (np > first_point)
   {
      if ((v - currV).Mag() > kStepEps)
      {
         Double_t step_frac = prod0 / (prod0 - prod1);
         if (step_frac > 0)
         {
            // Step for fraction of previous step size.
            // We pass 'enforce_max_step' flag to Update().
            Float_t orig_max_step = fH.fMaxStep;
            fH.fMaxStep = step_frac * (forwV - currV).Mag();
            Update(currV, p, kTRUE, kTRUE);
            Step(currV, p, forwV, forwP);
            p     = forwP;
            currV = forwV;
            fPoints.push_back(currV);
            ++np;
            fH.fMaxStep = orig_max_step;
         }

         // Distribute offset to desired crossing point over all segment.

         TEveVectorD off(v - currV);
         off *= 1.0f / currV.fT;
         DistributeOffset(off,  first_point, np, p);
         fV = v;
         return kTRUE;
      }
   }

   fPoints.push_back(v);
   fV = v;
   return kTRUE;
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::LoopToLineSegment(const TEveVectorD& s, const TEveVectorD& r, TEveVectorD& p)
{
   // Propagate charged particle with momentum p to line segment with point s and vector r to the second point.
   // It is expected that Update() with full-update was called before. Returns kFALSE if hits bounds.

   const Double_t maxRsq = fMaxR * fMaxR;
   const Double_t rMagInv = 1./r.Mag();

   TEveVector4D currV(fV);
   TEveVector4D forwV(fV);
   TEveVectorD  forwP(p);

   Int_t first_point = fPoints.size();
   Int_t np          = first_point;

   TEveVectorD forwC;
   TEveVectorD currC;
   do
   {
      Step(currV, p, forwV, forwP);
      Update(forwV, forwP);

      ClosestPointFromVertexToLineSegment(forwV, s, r, rMagInv, forwC);

      // check forwV is over segment with orthogonal component of
      // momentum to vector r
      TEveVectorD b = r; b.Normalize();
      Double_t    x = forwP.Dot(b);
      TEveVectorD pTPM = forwP - x*b;
      if (pTPM.Dot(forwC - forwV) < 0)
      {
         break;
      }

      if (IsOutsideBounds(forwV, maxRsq, fMaxZ))
      {
         fV = currV;
         return kFALSE;
      }

      fPoints.push_back(forwV);
      currV = forwV;
      p     = forwP;
      currC = forwC;
      ++np;
   } while (np < fNMax);

   // Get closest point on segment relative to line with forw and currV points.
   TEveVectorD v;
   ClosestPointBetweenLines(s, r, currV, forwV - currV, v);

   // make the remaining fractional step
   if (np > first_point)
   {
      if ((v - currV).Mag() > kStepEps)
      {
         TEveVector last_step = forwV - currV;
         TEveVector delta     = v - currV;
         Double_t  step_frac  = last_step.Dot(delta) / last_step.Mag2();
         if (step_frac > 0)
         {
            // Step for fraction of previous step size.
            // We pass 'enforce_max_step' flag to Update().
            Float_t orig_max_step = fH.fMaxStep;
            fH.fMaxStep = step_frac * (forwV - currV).Mag();
            Update(currV, p, kTRUE, kTRUE);
            Step(currV, p, forwV, forwP);
            p     = forwP;
            currV = forwV;
            fPoints.push_back(currV);
            ++np;
            fH.fMaxStep = orig_max_step;
         }

         // Distribute offset to desired crossing point over all segment.

         TEveVectorD off(v - currV);
         off *= 1.0f / currV.fT;
         DistributeOffset(off, first_point, np, p);
         fV = v;
         return kTRUE;
      }
   }

   fPoints.push_back(v);
   fV = v;
   return kTRUE;
}

//______________________________________________________________________________
void TEveTrackPropagator::DistributeOffset(const TEveVectorD& off, Int_t first_point, Int_t np, TEveVectorD& p)
{
   // Distribute offset between first and last point index and rotate
   // momentum.

   // Calculate the required momentum rotation.
   // lpd - last-points-delta
   TEveVectorD lpd0(fPoints[np-1]);
   lpd0 -= fPoints[np-2];
   lpd0.Normalize();

   for (Int_t i = first_point; i < np; ++i)
   {
      fPoints[i] += off * fPoints[i].fT;
   }

   TEveVectorD lpd1(fPoints[np-1]);
   lpd1 -= fPoints[np-2];
   lpd1.Normalize();

   TEveTrans tt;
   tt.SetupFromToVec(lpd0, lpd1);

   // TEveVectorD pb4(p);
   // printf("Rotating momentum: p0 = "); p.Dump();
   tt.RotateIP(p);
   // printf("                   p1 = "); p.Dump();
   // printf("  n1=%f, n2=%f, dp = %f deg\n", pb4.Mag(), p.Mag(),
   //        TMath::RadToDeg()*TMath::ACos(p.Dot(pb4)/(pb4.Mag()*p.Mag())));
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::LineToVertex(TEveVectorD& v)
{
   // Propagate neutral particle to vertex v.

   TEveVector4D currV = v;

   currV.fX = v.fX;
   currV.fY = v.fY;
   currV.fZ = v.fZ;
   fPoints.push_back(currV);

   fV = v;
   return kTRUE;
}

//______________________________________________________________________________
void TEveTrackPropagator::LineToBounds(TEveVectorD& p)
{
   // Propagatate neutral particle with momentum p to bounds.

   Double_t tZ = 0, tR = 0, tB = 0;

   // time where particle intersect +/- fMaxZ
   if (p.fZ > 0)
      tZ = (fMaxZ - fV.fZ) / p.fZ;
   else if (p.fZ < 0)
      tZ = - (fMaxZ + fV.fZ) / p.fZ;

   // time where particle intersects cylinder
   Double_t a = p.fX*p.fX + p.fY*p.fY;
   Double_t b = 2.0 * (fV.fX*p.fX + fV.fY*p.fY);
   Double_t c = fV.fX*fV.fX + fV.fY*fV.fY - fMaxR*fMaxR;
   Double_t d = b*b - 4.0*a*c;
   if (d >= 0) {
      Double_t sqrtD = TMath::Sqrt(d);
      tR = (-b - sqrtD) / (2.0 * a);
      if (tR < 0) {
         tR = (-b + sqrtD) / (2.0 * a);
      }
      tB = tR < tZ ? tR : tZ; // compare the two times
   } else {
      tB = tZ;
   }
   TEveVectorD nv(fV.fX + p.fX*tB, fV.fY + p.fY*tB, fV.fZ + p.fZ*tB);
   LineToVertex(nv);
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::HelixIntersectPlane(const TEveVectorD& p,
                                                const TEveVectorD& point,
                                                const TEveVectorD& normal,
                                                TEveVectorD& itsect)
{
   // Intersect helix with a plane. Current position and argument p define
   // the helix.

   TEveVectorD pos(fV);
   TEveVectorD mom(p);
   if (fMagFieldObj->IsConst())
      fH.UpdateHelix(mom, fMagFieldObj->GetFieldD(pos), kFALSE, kFALSE);

   TEveVectorD n(normal);
   TEveVectorD delta = pos - point;
   Double_t d = delta.Dot(n);
   if (d > 0) {
      n.NegateXYZ(); // Turn normal around so that we approach from negative side of the plane
      d = -d;
   }

   TEveVector4D forwV;
   TEveVectorD  forwP;
   TEveVector4D pos4(pos);
   while (kTRUE)
   {
      Update(pos4, mom);
      Step(pos4, mom, forwV , forwP);
      Double_t new_d = (forwV - point).Dot(n);
      if (new_d < d)
      {
         // We are going further away ... fail intersect.
         Warning("HelixIntersectPlane", "going away from the plane.");
         return kFALSE;
      }
      if (new_d > 0)
      {
         delta = forwV - pos;
         itsect = pos + delta * (d / (d - new_d));
         return kTRUE;
      }
      pos4 = forwV;
      mom  = forwP;
   }
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::LineIntersectPlane(const TEveVectorD& p,
                                               const TEveVectorD& point,
                                               const TEveVectorD& normal,
                                                     TEveVectorD& itsect)
{
   // Intersect line with a plane. Current position and argument p define
   // the line.

   TEveVectorD pos(fV.fX, fV.fY, fV.fZ);
   TEveVectorD delta = point - pos;

   Double_t pn = p.Dot(normal);
   if (pn == 0)
   {
     return kFALSE;
   }
   Double_t t = delta.Dot(normal) / pn;
   if (t < 0) {
      return kFALSE;
   } else {
      itsect = pos + p*t;
      return kTRUE;
   }
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::IntersectPlane(const TEveVectorD& p,
                                           const TEveVectorD& point,
                                           const TEveVectorD& normal,
                                                 TEveVectorD& itsect)
{
   // Find intersection of currently propagated track with a plane.
   // Current track position is used as starting point.
   //
   // Args:
   //  p        - track momentum to use for extrapolation
   //  point    - a point on a plane
   //  normal   - normal of the plane
   //  itsect   - output, point of intersection
   // Returns:
   //  kFALSE if intersection can not be found, kTRUE otherwise.

   if (fH.fCharge && fMagFieldObj && p.Perp2() > kPtMinSqr)
      return HelixIntersectPlane(p, point, normal, itsect);
   else
      return LineIntersectPlane(p, point, normal, itsect);
}

//______________________________________________________________________________
void TEveTrackPropagator::ClosestPointFromVertexToLineSegment(const TEveVectorD& v,
                                                              const TEveVectorD& s,
                                                              const TEveVectorD& r,
                                                              Double_t rMagInv,
                                                              TEveVectorD& c)
{
   // Get closest point from given vertex v to line segment defined with s and r.
   // Argument rMagInv is cached. rMagInv= 1./rMag()

   TEveVectorD dir = v - s;
   TEveVectorD b1  = r * rMagInv;

   // paralell distance
   Double_t dot     = dir.Dot(b1);
   TEveVectorD dirI = dot * b1;

   Double_t facX = dot * rMagInv;

   if (facX <= 0)
      c = s;
   else if (facX >= 1)
      c = s + r;
   else
      c = s + dirI;
}

//______________________________________________________________________________
Bool_t TEveTrackPropagator::ClosestPointBetweenLines(const TEveVectorD& p0,
                                                     const TEveVectorD& u,
                                                     const TEveVectorD& q0,
                                                     const TEveVectorD& v,
                                                     TEveVectorD& out)
{
   // Get closest point on line defined with vector p0 and u.
   // Return false if the point is forced on the line segment.

   TEveVectorD w0 = p0 -q0;
   Double_t a = u.Mag2();
   Double_t b = u.Dot(v);
   Double_t c = v.Mag2();
   Double_t d = u.Dot(w0);
   Double_t e = v.Dot(w0);

   Double_t x = (b*e - c*d)/(a*c -b*b);
   Bool_t force = (x < 0 || x > 1);
   out = p0 + TMath::Range(0., 1., x) * u;
   return force;
}

//______________________________________________________________________________
void TEveTrackPropagator::FillPointSet(TEvePointSet* ps) const
{
   // Reset ps and populate it with points in propagation cache.

   Int_t size = TMath::Min(fNMax, (Int_t)fPoints.size());
   ps->Reset(size);
   for (Int_t i = 0; i < size; ++i)
   {
      const TEveVector4D& v = fPoints[i];
      ps->SetNextPoint(v.fX, v.fY, v.fZ);
   }
}

/******************************************************************************/

//______________________________________________________________________________
void TEveTrackPropagator::RebuildTracks()
{
   // Rebuild all tracks using this render-style.

   TEveTrack* track;
   RefMap_i i = fBackRefs.begin();
   while (i != fBackRefs.end())
   {
      track = dynamic_cast<TEveTrack*>(i->first);
      track->MakeTrack();
      track->StampObjProps();
      ++i;
   }
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMagField(Double_t bX, Double_t bY, Double_t bZ)
{
   // Set constant magnetic field and rebuild tracks.

   SetMagFieldObj(new TEveMagFieldConst(bX, bY, bZ));
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMagFieldObj(TEveMagField* field, Bool_t own_field)
{
   // Set constant magnetic field and rebuild tracks.

   if (fMagFieldObj && fOwnMagFiledObj) delete fMagFieldObj;

   fMagFieldObj    = field;
   fOwnMagFiledObj = own_field;

   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::PrintMagField(Double_t x, Double_t y, Double_t z) const
{
   if (fMagFieldObj) fMagFieldObj->PrintField(x, y, z);
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMaxR(Double_t x)
{
   // Set maximum radius and rebuild tracks.

   fMaxR = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMaxZ(Double_t x)
{
   // Set maximum z and rebuild tracks.

   fMaxZ = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMaxOrbs(Double_t x)
{
   // Set maximum number of orbits and rebuild tracks.

   fMaxOrbs = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMinAng(Double_t x)
{
   // Set maximum step angle and rebuild tracks.
   // WARNING -- this method / variable was mis-named.

   Warning("SetMinAng", "This method was mis-named, use SetMaxAng() instead!");
   SetMaxAng(x);
}
//______________________________________________________________________________
Double_t TEveTrackPropagator::GetMinAng() const
{
   // Get maximum step angle.
   // WARNING -- this method / variable was mis-named.

   Warning("GetMinAng", "This method was mis-named, use GetMaxAng() instead!");
   return GetMaxAng();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMaxAng(Double_t x)
{
   // Set maximum step angle and rebuild tracks.

   fH.fMaxAng = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetMaxStep(Double_t x)
{
   // Set maximum step-size and rebuild tracks.

   fH.fMaxStep = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetDelta(Double_t x)
{
   // Set maximum error and rebuild tracks.

   fH.fDelta = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetFitDaughters(Bool_t x)
{
   // Set daughter creation point fitting and rebuild tracks.

   fFitDaughters = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetFitReferences(Bool_t x)
{
   // Set track-reference fitting and rebuild tracks.

   fFitReferences = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetFitDecay(Bool_t x)
{
   // Set decay fitting and rebuild tracks.

   fFitDecay = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetFitLineSegments(Bool_t x)
{
   // Set line segment fitting and rebuild tracks.

   fFitLineSegments = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetFitCluster2Ds(Bool_t x)
{
   // Set 2D-cluster fitting and rebuild tracks.

   fFitCluster2Ds = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrDecay(Bool_t rnr)
{
   // Set decay rendering and rebuild tracks.

   fRnrDecay = rnr;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrCluster2Ds(Bool_t rnr)
{
   // Set rendering of 2D-clusters and rebuild tracks.

   fRnrCluster2Ds = rnr;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrDaughters(Bool_t rnr)
{
   // Set daughter rendering and rebuild tracks.

   fRnrDaughters = rnr;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrReferences(Bool_t rnr)
{
   // Set track-reference rendering and rebuild tracks.

   fRnrReferences = rnr;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrFV(Bool_t x)
{
   // Set first-vertex rendering and rebuild tracks.

   fRnrFV = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetProjTrackBreaking(UChar_t x)
{
   // Set projection break-point mode and rebuild tracks.

   fProjTrackBreaking = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::SetRnrPTBMarkers(Bool_t x)
{
   // Set projection break-point rendering and rebuild tracks.

   fRnrPTBMarkers = x;
   RebuildTracks();
}

//______________________________________________________________________________
void TEveTrackPropagator::StepRungeKutta(Double_t step,
                                         Double_t* vect, Double_t* vout)
{
  // Wrapper to step with method RungeKutta.

  ///	******************************************************************
  ///	*								 *
  ///	*  Runge-Kutta method for tracking a particle through a magnetic *
  ///	*  field. Uses Nystroem algorithm (See Handbook Nat. Bur. of	 *
  ///	*  Standards, procedure 25.5.20)				 *
  ///	*								 *
  ///	*  Input parameters						 *
  ///	*	CHARGE    Particle charge				 *
  ///	*	STEP	  Step size					 *
  ///	*	VECT	  Initial co-ords,direction cosines,momentum	 *
  ///	*  Output parameters						 *
  ///	*	VOUT	  Output co-ords,direction cosines,momentum	 *
  ///	*  User routine called  					 *
  ///	*	CALL GUFLD(X,F) 					 *
  ///	*								 *
  ///	*    ==>Called by : <USER>, GUSWIM				 *
  ///	*	Authors    R.Brun, M.Hansroul  *********		 *
  ///	*		   V.Perevoztchikov (CUT STEP implementation)	 *
  ///	*								 *
  ///	*								 *
  ///	******************************************************************

  Double_t h2, h4, f[4];
  Double_t /* xyzt[3], */ a, b, c, ph,ph2;
  Double_t secxs[4],secys[4],seczs[4],hxp[3];
  Double_t g1, g2, g3, g4, g5, g6, ang2, dxt, dyt, dzt;
  Double_t est, at, bt, ct, cba;
  Double_t f1, f2, f3, f4, rho, tet, hnorm, hp, rho1, sint, cost;

  Double_t x;
  Double_t y;
  Double_t z;

  Double_t xt;
  Double_t yt;
  Double_t zt;

  // const Int_t maxit = 1992;
  const Int_t maxit  = 500;
  const Int_t maxcut = 11;

  const Double_t hmin   = 1e-4; // !!! MT ADD,  should be member
  const Double_t kdlt   = 1e-3; // !!! MT CHANGE from 1e-4, should be member
  const Double_t kdlt32 = kdlt/32.;
  const Double_t kthird = 1./3.;
  const Double_t khalf  = 0.5;
  const Double_t kec    = 2.9979251e-3;

  const Double_t kpisqua = 9.86960440109;
  const Int_t kix  = 0;
  const Int_t kiy  = 1;
  const Int_t kiz  = 2;
  const Int_t kipx = 3;
  const Int_t kipy = 4;
  const Int_t kipz = 5;

  // *.
  // *.    ------------------------------------------------------------------
  // *.
  // *             this constant is for units cm,gev/c and kgauss
  // *
  Int_t iter = 0;
  Int_t ncut = 0;
  for(Int_t j = 0; j < 7; j++)
    vout[j] = vect[j];

  Double_t pinv   = kec * fH.fCharge / vect[6];
  Double_t tl     = 0.;
  Double_t h      = step;
  Double_t rest;

  do {
    rest  = step - tl;
    if (TMath::Abs(h) > TMath::Abs(rest))
       h = rest;

    f[0] = -fH.fB.fX;
    f[1] = -fH.fB.fY;
    f[2] = -fH.fB.fZ;

    // * start of integration
    x      = vout[0];
    y      = vout[1];
    z      = vout[2];
    a      = vout[3];
    b      = vout[4];
    c      = vout[5];

    h2     = khalf * h;
    h4     = khalf * h2;
    ph     = pinv * h;
    ph2    = khalf * ph;
    secxs[0] = (b * f[2] - c * f[1]) * ph2;
    secys[0] = (c * f[0] - a * f[2]) * ph2;
    seczs[0] = (a * f[1] - b * f[0]) * ph2;
    ang2 = (secxs[0]*secxs[0] + secys[0]*secys[0] + seczs[0]*seczs[0]);
    if (ang2 > kpisqua) break;

    dxt    = h2 * a + h4 * secxs[0];
    dyt    = h2 * b + h4 * secys[0];
    dzt    = h2 * c + h4 * seczs[0];
    xt     = x + dxt;
    yt     = y + dyt;
    zt     = z + dzt;

    // * second intermediate point
    est = TMath::Abs(dxt) + TMath::Abs(dyt) + TMath::Abs(dzt);
    if (est > h) {
      if (ncut++ > maxcut) break;
      h *= khalf;
      continue;
    }

    // xyzt[0] = xt;
    // xyzt[1] = yt;
    // xyzt[2] = zt;

    fH.fB = fMagFieldObj->GetFieldD(xt, yt, zt);
    f[0] = -fH.fB.fX;
    f[1] = -fH.fB.fY;
    f[2] = -fH.fB.fZ;

    at     = a + secxs[0];
    bt     = b + secys[0];
    ct     = c + seczs[0];

    secxs[1] = (bt * f[2] - ct * f[1]) * ph2;
    secys[1] = (ct * f[0] - at * f[2]) * ph2;
    seczs[1] = (at * f[1] - bt * f[0]) * ph2;
    at     = a + secxs[1];
    bt     = b + secys[1];
    ct     = c + seczs[1];
    secxs[2] = (bt * f[2] - ct * f[1]) * ph2;
    secys[2] = (ct * f[0] - at * f[2]) * ph2;
    seczs[2] = (at * f[1] - bt * f[0]) * ph2;
    dxt    = h * (a + secxs[2]);
    dyt    = h * (b + secys[2]);
    dzt    = h * (c + seczs[2]);
    xt     = x + dxt;
    yt     = y + dyt;
    zt     = z + dzt;
    at     = a + 2.*secxs[2];
    bt     = b + 2.*secys[2];
    ct     = c + 2.*seczs[2];

    est = TMath::Abs(dxt)+TMath::Abs(dyt)+TMath::Abs(dzt);
    if (est > 2.*TMath::Abs(h)) {
      if (ncut++ > maxcut) break;
      h *= khalf;
      continue;
    }

    // xyzt[0] = xt;
    // xyzt[1] = yt;
    // xyzt[2] = zt;

    fH.fB = fMagFieldObj->GetFieldD(xt, yt, zt);
    f[0] = -fH.fB.fX;
    f[1] = -fH.fB.fY;
    f[2] = -fH.fB.fZ;

    z      = z + (c + (seczs[0] + seczs[1] + seczs[2]) * kthird) * h;
    y      = y + (b + (secys[0] + secys[1] + secys[2]) * kthird) * h;
    x      = x + (a + (secxs[0] + secxs[1] + secxs[2]) * kthird) * h;

    secxs[3] = (bt*f[2] - ct*f[1])* ph2;
    secys[3] = (ct*f[0] - at*f[2])* ph2;
    seczs[3] = (at*f[1] - bt*f[0])* ph2;
    a      = a+(secxs[0]+secxs[3]+2. * (secxs[1]+secxs[2])) * kthird;
    b      = b+(secys[0]+secys[3]+2. * (secys[1]+secys[2])) * kthird;
    c      = c+(seczs[0]+seczs[3]+2. * (seczs[1]+seczs[2])) * kthird;

    est    = TMath::Abs(secxs[0]+secxs[3] - (secxs[1]+secxs[2]))
      + TMath::Abs(secys[0]+secys[3] - (secys[1]+secys[2]))
      + TMath::Abs(seczs[0]+seczs[3] - (seczs[1]+seczs[2]));

    if (est > kdlt && TMath::Abs(h) > hmin) {
      if (ncut++ > maxcut) break;
      h *= khalf;
      continue;
    }

    ncut = 0;
    // * if too many iterations, go to helix
    if (iter++ > maxit) break;

    tl += h;
    if (est < kdlt32)
      h *= 2.;
    cba    = 1./ TMath::Sqrt(a*a + b*b + c*c);
    vout[0] = x;
    vout[1] = y;
    vout[2] = z;
    vout[3] = cba*a;
    vout[4] = cba*b;
    vout[5] = cba*c;
    rest = step - tl;
    if (step < 0.) rest = -rest;
    if (rest < 1.e-5*TMath::Abs(step))
    {
       Float_t dot = (vout[3]*vect[3] + vout[4]*vect[4] + vout[5]*vect[5]);
       fH.fPhi += TMath::ACos(dot);
       return;
    }

  } while(1);

  // angle too big, use helix

  f1  = f[0];
  f2  = f[1];
  f3  = f[2];
  f4  = TMath::Sqrt(f1*f1+f2*f2+f3*f3);
  rho = -f4*pinv;
  tet = rho * step;

  hnorm = 1./f4;
  f1 = f1*hnorm;
  f2 = f2*hnorm;
  f3 = f3*hnorm;

  hxp[0] = f2*vect[kipz] - f3*vect[kipy];
  hxp[1] = f3*vect[kipx] - f1*vect[kipz];
  hxp[2] = f1*vect[kipy] - f2*vect[kipx];

  hp = f1*vect[kipx] + f2*vect[kipy] + f3*vect[kipz];

  rho1 = 1./rho;
  sint = TMath::Sin(tet);
  cost = 2.*TMath::Sin(khalf*tet)*TMath::Sin(khalf*tet);

  g1 = sint*rho1;
  g2 = cost*rho1;
  g3 = (tet-sint) * hp*rho1;
  g4 = -cost;
  g5 = sint;
  g6 = cost * hp;

  vout[kix] = vect[kix] + g1*vect[kipx] + g2*hxp[0] + g3*f1;
  vout[kiy] = vect[kiy] + g1*vect[kipy] + g2*hxp[1] + g3*f2;
  vout[kiz] = vect[kiz] + g1*vect[kipz] + g2*hxp[2] + g3*f3;

  vout[kipx] = vect[kipx] + g4*vect[kipx] + g5*hxp[0] + g6*f1;
  vout[kipy] = vect[kipy] + g4*vect[kipy] + g5*hxp[1] + g6*f2;
  vout[kipz] = vect[kipz] + g4*vect[kipz] + g5*hxp[2] + g6*f3;

  fH.fPhi += tet;
}
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