/usr/include/root/THelix.h is in libroot-graf3d-g3d-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Ping Yeh 19/12/97
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_THelix
#define ROOT_THelix
//////////////////////////////////////////////////////////////////////////
// //
// THelix //
// //
// A Helix with axis // z-axis: //
// //
// X(t) = X0 - vt / w sin(-wt+phi0) //
// Y(t) = Y0 + vt / w cos(-wt+phi0) //
// Z(t) = Z0 + vz t //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TPolyLine3D
#include "TPolyLine3D.h"
#endif
#ifndef ROOT_TRotMatrix
#include "TRotMatrix.h"
#endif
enum EHelixRangeType {
kHelixT, kHelixX, kHelixY, kHelixZ, kLabX, kLabY, kLabZ, kUnchanged
};
class THelix : public TPolyLine3D {
protected:
Double_t fX0; //Pivot's x position (see parametrization in class doc)
Double_t fY0; //Pivot's y position (see parametrization in class doc)
Double_t fZ0; //Pivot's z position (see parametrization in class doc)
Double_t fVt; //Transverse velocity (constant of motion)
Double_t fPhi0; //Initial phase, so vx0 = fVt*cos(fPhi0)
Double_t fVz; //Z velocity (constant of motion)
Double_t fW; //Angular frequency
Double_t fAxis[3]; //Direction unit vector of the helix axis
TRotMatrix *fRotMat; //Rotation matrix: axis // z --> axis // fAxis
Double_t fRange[2]; //Range of helix parameter t
THelix& operator=(const THelix&);
void SetRotMatrix(); //Set rotation matrix
Double_t FindClosestPhase(Double_t phi0, Double_t cosine);
static Int_t fgMinNSeg; //minimal number of segments in polyline
public:
THelix();
THelix(Double_t x, Double_t y, Double_t z,
Double_t vx, Double_t vy, Double_t vz,
Double_t w);
THelix(Double_t * xyz, Double_t * v, Double_t w,
Double_t * range=0, EHelixRangeType rtype=kHelixZ,
Double_t * axis=0);
THelix(const THelix &helix);
virtual ~THelix();
virtual void Copy(TObject &helix) const;
virtual void Draw(Option_t *option="");
Option_t *GetOption() const {return fOption.Data();}
virtual void Print(Option_t *option="") const;
virtual void SavePrimitive(ostream &out, Option_t *option = "");
virtual void SetOption(Option_t *option="") {fOption = option;}
virtual void SetAxis(Double_t * axis); //Define new axis
virtual void SetAxis(Double_t x, Double_t y, Double_t z);
virtual void SetRange(Double_t * range, EHelixRangeType rtype=kHelixZ);
virtual void SetRange(Double_t r1, Double_t r2, EHelixRangeType rtype=kHelixZ);
void SetHelix(Double_t *xyz, Double_t *v, Double_t w,
Double_t *range=0, EHelixRangeType type=kUnchanged,
Double_t *axis=0);
ClassDef(THelix,2) //A Helix drawn as a PolyLine3D
};
#endif
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