/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/DataFormats/GeometrySurface/interface/Line.h

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#ifndef Geom_Line_H
#define Geom_Line_H

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"

class Line {
public:

typedef GlobalPoint           PositionType;
typedef GlobalVector          DirectionType;

Line(){}

//Line( const PositionType& pos, const  DirectionType& dir) :
Line(  PositionType& pos,  DirectionType& dir) :
  thePos(pos), theDir(dir.unit()) {}

~Line(){};

//const PositionType& position()   const { return thePos;}
//const DirectionType& direction() const { return theDir;}
PositionType position()   const  { return thePos;}
DirectionType direction() const  { return theDir;}

GlobalPoint closerPointToLine( const Line & aLine) const {

GlobalPoint  V = aLine.position();
GlobalVector J = aLine.direction();
GlobalVector Q = theDir - J.dot(theDir) * J;
double lambda = Q.dot(V-thePos)/Q.dot(theDir);
return   thePos + lambda*theDir;
}

GlobalVector distance( const Line & aLine) const {

GlobalPoint  V = aLine.position();
GlobalVector J = aLine.direction();
GlobalVector P = (theDir.cross(J)).unit();
GlobalVector D;
D= P.dot(thePos-V) * P;
return D;
}

GlobalVector distance(const GlobalPoint & aPoint) const {

GlobalVector P(aPoint.x(),aPoint.y(),aPoint.z());
GlobalVector T0(thePos.x(),thePos.y(),thePos.z());
return T0-P + theDir.dot(P-T0) * theDir;
}

private:
  PositionType  thePos;
  DirectionType  theDir;
};
  


#endif // Geom_Line_H