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 #ifndef ConeDefinition_h
 #define ConeDefinition_h
 
 #include "DataFormats/GeometryVector/interface/GlobalPoint.h"
 #include "DataFormats/GeometryVector/interface/GlobalVector.h"
 
 #include "CommonTools/UtilAlgos/interface/DeltaR.h"
 
 inline double getDistInPlaneSimple(const GlobalPoint caloPoint, const GlobalPoint rechitPoint) {
   // Simplified version of getDistInPlane
   // Assume track direction is origin -> point of hcal intersection
 
   const GlobalVector caloIntersectVector(caloPoint.x(), caloPoint.y(), caloPoint.z());
 
   const GlobalVector caloIntersectUnitVector = caloIntersectVector.unit();
 
   const GlobalVector rechitVector(rechitPoint.x(), rechitPoint.y(), rechitPoint.z());
 
   const GlobalVector rechitUnitVector = rechitVector.unit();
   double dotprod = caloIntersectUnitVector.dot(rechitUnitVector);
   double rechitdist = caloIntersectVector.mag() / dotprod;
 
   const GlobalVector effectiveRechitVector = rechitdist * rechitUnitVector;
   const GlobalPoint effectiveRechitPoint(
       effectiveRechitVector.x(), effectiveRechitVector.y(), effectiveRechitVector.z());
 
   GlobalVector distance_vector = effectiveRechitPoint - caloPoint;
 
   if (dotprod > 0.) {
     return distance_vector.mag();
   } else {
     return 999999.;
   }
 }
 
 inline double getDistInPlaneTrackDir(const GlobalPoint caloPoint,
                                      const GlobalVector caloVector,
                                      const GlobalPoint rechitPoint) {
   // Simplified version of getDistInPlane : no cone "within" Hcal, but
   // don't assume track direction is origin -> point of hcal
   // intersection.
   const GlobalVector caloIntersectVector(caloPoint.x(), caloPoint.y(),
                                          caloPoint.z());  //p
 
   const GlobalVector caloUnitVector = caloVector.unit();
   const GlobalVector rechitVector(rechitPoint.x(), rechitPoint.y(), rechitPoint.z());
   const GlobalVector rechitUnitVector = rechitVector.unit();
   double dotprod_denominator = caloUnitVector.dot(rechitUnitVector);
   double dotprod_numerator = caloUnitVector.dot(caloIntersectVector);
   double rechitdist = dotprod_numerator / dotprod_denominator;
   //  double rechitdist=caloIntersectVector.dot(rechitUnitVector);
   const GlobalVector effectiveRechitVector = rechitdist * rechitUnitVector;
   const GlobalPoint effectiveRechitPoint(
       effectiveRechitVector.x(), effectiveRechitVector.y(), effectiveRechitVector.z());
   GlobalVector distance_vector = effectiveRechitPoint - caloPoint;
   if (dotprod_denominator > 0. && dotprod_numerator > 0.) {
     return distance_vector.mag();
   } else {
     return 999999.;
   }
 }
 
 inline double getDistInPlane(const GlobalVector trackDirection,
                              const GlobalPoint caloPoint,
                              const GlobalPoint rechitPoint,
                              double coneHeight) {
   // The iso track candidate hits the Calo (Ecal or Hcal) at "caloPoint"
   // with direction "trackDirection".
 
   // "rechitPoint" is the position of the rechit.  We only care about
   // the direction of the rechit.
 
   // Consider the rechitPoint as characterized by angles theta and phi
   // wrt the origin which points at the calo cell of the rechit.  In
   // some sense the distance along the line theta/phi is arbitrary. A
   // simplified choice might be to put the rechit at the surface of
   // the Hcal.  Our approach is to see whether/where this line
   // intersects a cone of height "coneHeight" with vertex at caloPoint
   // aligned with trackDirection.
   // To that end, this function returns the distance between the
   // center of the base of the cone and the intersection of the rechit
   // line and the plane that contains the base of the cone.  This
   // distance is compared with the radius of the cone outside this
   // function.
 
   // Make vector of length cone height along track direction
   const GlobalVector heightVector = trackDirection * coneHeight;
 
   // Make vector from origin to point where iso track intersects the
   // calorimeter.
   const GlobalVector caloIntersectVector(caloPoint.x(), caloPoint.y(), caloPoint.z());
 
   // Make vector from origin to point in center of base of cone
   const GlobalVector coneBaseVector = heightVector + caloIntersectVector;
 
   // Make point in center of base of cone
   const GlobalPoint coneBasePoint(coneBaseVector.x(), coneBaseVector.y(), coneBaseVector.z());
 
   // Make unit vector pointing at rechit.
   const GlobalVector rechitVector(rechitPoint.x(), rechitPoint.y(), rechitPoint.z());
   const GlobalVector rechitDirection = rechitVector.unit();
 
   // Find distance "r" along "rechit line" (with angles theta2 and
   // phi2) where line intersects plane defined by base of cone.
 
   // Definition plane of that contains base of cone:
   // trackDirection.x() (x - coneBaseVector.x()) +
   // trackDirection.y() (y - coneBaseVector.y()) +
   // trackDirection.z() (z - coneBaseVector.z()) = 0
 
   // Point P_{rh} where rechit line intersects plane:
   // (rechitdist sin(theta2) cos(phi2),
   //  rechitdist sin(theta2) cos(phi2),
   //  rechitdist cos(theta2))
 
   // Substitute P_{rh} into equation for plane and solve for rechitdist.
   // rechitDist turns out to be the ratio of dot products:
 
   double rechitdist = trackDirection.dot(coneBaseVector) / trackDirection.dot(rechitDirection);
 
   // Now find distance between point at center of cone base and point
   // where the "rechit line" intersects the plane defined by the base
   // of the cone; i.e. the effectiveRecHitPoint.
   const GlobalVector effectiveRechitVector = rechitdist * rechitDirection;
   const GlobalPoint effectiveRechitPoint(
       effectiveRechitVector.x(), effectiveRechitVector.y(), effectiveRechitVector.z());
 
   GlobalVector distance_vector = effectiveRechitPoint - coneBasePoint;
   return distance_vector.mag();
 }
 
 #endif

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