library: libGeom #include "TGeoTube.h"

# TGeoTube

class description - source file - inheritance tree (.ps)

## class TGeoTube : public TGeoBBox

| Inheritance Chart:

`TObject`

<-

`TNamed`

<-

`TGeoShape`

<-

`TGeoBBox`

<-

`TGeoTube`

<-

`TGeoEltu` |

`TGeoTubeSeg`

<-

`TGeoCtub` |

        public:

                              TGeoTube()
                              TGeoTube(Double_t rmin, Double_t rmax, Double_t dz)
                              TGeoTube(const char* name, Double_t rmin, Double_t rmax, Double_t dz)
                              TGeoTube(Double_t* params)
                              TGeoTube(const TGeoTube&)
                      virtual ~TGeoTube()
               static TClass* Class()
                 virtual void ComputeBBox()
                 virtual void ComputeNormal(Double_t* point, Double_t* dir, Double_t* norm)
                  static void ComputeNormalS(Double_t* point, Double_t* dir, Double_t* norm, Double_t rmin, Double_t rmax, Double_t dz)
               virtual Bool_t Contains(Double_t* point) const
                virtual Int_t DistancetoPrimitive(Int_t px, Int_t py)
             virtual Double_t DistToIn(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
              static Double_t DistToInS(Double_t* point, Double_t* dir, Double_t rmin, Double_t rmax, Double_t dz)
             virtual Double_t DistToOut(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
              static Double_t DistToOutS(Double_t* point, Double_t* dir, Double_t rmin, Double_t rmax, Double_t dz)
                  static void DistToTube(Double_t rsq, Double_t nsq, Double_t rdotn, Double_t radius, Double_t& b, Double_t& delta)
          virtual TGeoVolume* Divide(TGeoVolume* voldiv, const char* divname, Int_t iaxis, Int_t ndiv, Double_t start, Double_t step)
          virtual const char* GetAxisName(Int_t iaxis) const
             virtual Double_t GetAxisRange(Int_t iaxis, Double_t& xlo, Double_t& xhi) const
                 virtual void GetBoundingCylinder(Double_t* param) const
                virtual Int_t GetByteCount() const
             virtual Double_t GetDz() const
           virtual TGeoShape* GetMakeRuntimeShape(TGeoShape* mother, TGeoMatrix* mat) const
                virtual Int_t GetNmeshVertices() const
             virtual Double_t GetRmax() const
             virtual Double_t GetRmin() const
                 virtual void InspectShape() const
              virtual TClass* IsA() const
               virtual Bool_t IsCylType() const
                virtual void* Make3DBuffer(const TGeoVolume* vol) const
                    TGeoTube& operator=(const TGeoTube&)
                 virtual void Paint(Option_t* option)
             virtual Double_t Safety(Double_t* point, Bool_t in = kTRUE) const
              static Double_t SafetyS(Double_t* point, Bool_t in, Double_t rmin, Double_t rmax, Double_t dz, Int_t skipz = 0)
                 virtual void SetDimensions(Double_t* param)
                 virtual void SetPoints(Double_t* buff) const
                 virtual void SetPoints(Float_t* buff) const
                         void SetTubeDimensions(Double_t rmin, Double_t rmax, Double_t dz)
                 virtual void ShowMembers(TMemberInspector& insp, char* parent)
                 virtual void Sizeof3D() const
                 virtual void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)

### Data Members

        protected:

          Double_t fRmin  inner radius
          Double_t fRmax  outer radius
          Double_t fDz    half length

## Class Description

     TGeoTube - cylindrical tube class. It takes 3 parameters :
                inner radius, outer radius and half-length dz.

    _____________________________________________________________________________

/* */

/* */

/* */

/* */

/* */

/* */

/* */

    _____________________________________________________________________________
     TGeoTubeSeg - a phi segment of a tube. Has 5 parameters :
                - the same 3 as a tube;
                - first phi limit (in degrees)
                - second phi limit

    _____________________________________________________________________________

/* */

/* */

/* */

/* */

    _____________________________________________________________________________
     TGeoCtub - a tube segment cut with 2 planes. Has 11 parameters :
                - the same 5 as a tube segment;
                - x, y, z components of the normal to the -dZ cut plane in
                  point (0, 0, -dZ);
                - x, y, z components of the normal to the +dZ cut plane in
                  point (0, 0, dZ);

    _____________________________________________________________________________

/* */

TGeoTube()

     Default constructor

TGeoTube(Double_t rmin, Double_t rmax, Double_t dz) :TGeoBBox(0, 0, 0)

     Default constructor specifying minimum and maximum radius

TGeoTube(const char *name, Double_t rmin, Double_t rmax, Double_t dz) :TGeoBBox(name, 0, 0, 0)

     Default constructor specifying minimum and maximum radius

TGeoTube(Double_t *param) :TGeoBBox(0, 0, 0)

     Default constructor specifying minimum and maximum radius
     param[0] = Rmin
     param[1] = Rmax
     param[2] = dz

~TGeoTube()

     destructor

void ComputeBBox()

     compute bounding box of the tube

void ComputeNormal(Double_t *point, Double_t *dir, Double_t *norm)

     Compute normal to closest surface from POINT.

void ComputeNormalS(Double_t *point, Double_t *dir, Double_t *norm, Double_t /*rmin*/, Double_t /*rmax*/, Double_t /*dz*/)

     Compute normal to closest surface from POINT.

Bool_t Contains(Double_t *point) const

     test if point is inside this tube

Int_t DistancetoPrimitive(Int_t px, Int_t py)

     compute closest distance from point px,py to each corner

Double_t DistToOutS(Double_t *point, Double_t *dir, Double_t rmin, Double_t rmax, Double_t dz)

     compute distance from inside point to surface of the tube (static)

Double_t DistToOut(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const

     compute distance from inside point to surface of the tube

Double_t DistToInS(Double_t *point, Double_t *dir, Double_t rmin, Double_t rmax, Double_t dz)

     static method to compute distance from outside point to a tube with given parameters

Double_t DistToIn(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const

     compute distance from outside point to surface of the tube and safe distance
     fist localize point w.r.t tube

void DistToTube(Double_t rsq, Double_t nsq, Double_t rdotn, Double_t radius, Double_t &b, Double_t &delta)

     Static method computing the distance to a tube with given radius, starting from
     POINT along DIR director cosines. The distance is computed as :
        RSQ   = point[0]*point[0]+point[1]*point[1]
        NSQ   = dir[0]*dir[0]+dir[1]*dir[1]  ---> should NOT be 0 !!!
        RDOTN = point[0]*dir[0]+point[1]*dir[1]
     The distance can be computed as :
        D = -B +/- DELTA
     where DELTA.GT.0 and D.GT.0

TGeoVolume* Divide(TGeoVolume *voldiv, const char *divname, Int_t iaxis, Int_t ndiv, Double_t start, Double_t step)

    --- Divide this tube shape belonging to volume "voldiv" into ndiv volumes
     called divname, from start position with the given step. Returns pointer
     to created division cell volume in case of Z divisions. For radial division
     creates all volumes with different shapes and returns pointer to volume that
     was divided. In case a wrong division axis is supplied, returns pointer to
     volume that was divided.

const char* GetAxisName(Int_t iaxis) const

     Returns name of axis IAXIS.

Double_t GetAxisRange(Int_t iaxis, Double_t &xlo, Double_t &xhi) const

     Get range of shape for a given axis.

void GetBoundingCylinder(Double_t *param) const

    --- Fill vector param[4] with the bounding cylinder parameters. The order
     is the following : Rmin, Rmax, Phi1, Phi2, dZ

TGeoShape* GetMakeRuntimeShape(TGeoShape *mother, TGeoMatrix * /*mat*/) const

     in case shape has some negative parameters, these has to be computed
     in order to fit the mother

void InspectShape() const

     print shape parameters

void* Make3DBuffer(const TGeoVolume *vol) const

void Paint(Option_t *option)

     paint this shape according to option

Double_t Safety(Double_t *point, Bool_t in) const

     computes the closest distance from given point to this shape, according
     to option. The matching point on the shape is stored in spoint.

Double_t SafetyS(Double_t *point, Bool_t in, Double_t rmin, Double_t rmax, Double_t dz, Int_t skipz)

     computes the closest distance from given point to this shape, according
     to option. The matching point on the shape is stored in spoint.

void SetTubeDimensions(Double_t rmin, Double_t rmax, Double_t dz)

void SetDimensions(Double_t *param)

void SetPoints(Double_t *buff) const

     create tube mesh points

void SetPoints(Float_t *buff) const

     create tube mesh points

Int_t GetNmeshVertices() const

     Return number of vertices of the mesh representation

void Sizeof3D() const

     fill size of this 3-D object

### Inline Functions

                  Int_t GetByteCount() const
               Double_t GetRmin() const
               Double_t GetRmax() const
               Double_t GetDz() const
                 Bool_t IsCylType() const
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
               TGeoTube TGeoTube(const TGeoTube&)
              TGeoTube& operator=(const TGeoTube&)

Author: Andrei Gheata 24/10/01
Last update: root/geom:$Name: $:$Id: TGeoTube.cxx,v 1.36 2004/06/25 11:59:56 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *