library: libGeom #include "TGeoTrd1.h"

# TGeoTrd1

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

## class TGeoTrd1 : public TGeoBBox

| Inheritance Chart:
`TObject`
| <- | `TNamed`
| <- | `TGeoShape`
| <- | `TGeoBBox`
| <- | `TGeoTrd1` |

        public:

                              TGeoTrd1()
                              TGeoTrd1(Double_t dx1, Double_t dx2, Double_t dy, Double_t dz)
                              TGeoTrd1(const char* name, Double_t dx1, Double_t dx2, Double_t dy, Double_t dz)
                              TGeoTrd1(Double_t* params)
                              TGeoTrd1(const TGeoTrd1&)
                      virtual ~TGeoTrd1()
               static TClass* Class()
                 virtual void ComputeBBox()
                 virtual void ComputeNormal(Double_t* point, Double_t* dir, Double_t* norm)
               virtual Bool_t Contains(Double_t* point) const
             virtual Double_t DistFromInside(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
             virtual Double_t DistFromOutside(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
          virtual TGeoVolume* Divide(TGeoVolume* voldiv, const char* divname, Int_t iaxis, Int_t ndiv, Double_t start, Double_t step)
             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
                     Double_t GetDx1() const
                     Double_t GetDx2() const
                     Double_t GetDy() const
                     Double_t GetDz() const
                virtual Int_t GetFittingBox(const TGeoBBox* parambox, TGeoMatrix* mat, Double_t& dx, Double_t& dy, Double_t& dz) const
           virtual TGeoShape* GetMakeRuntimeShape(TGeoShape* mother, TGeoMatrix* mat) const
                virtual Int_t GetNmeshVertices() const
                         void GetOppositeCorner(Double_t* point, Int_t inorm, Double_t* vertex, Double_t* normals) const
                         void GetVisibleCorner(Double_t* point, Double_t* vertex, Double_t* normals) const
                 virtual void InspectShape() const
              virtual TClass* IsA() const
               virtual Bool_t IsCylType() const
                    TGeoTrd1& operator=(const TGeoTrd1&)
             virtual Double_t Safety(Double_t* point, Bool_t in = kTRUE) const
                 virtual void SavePrimitive(ofstream& out, Option_t* option)
                 virtual void SetDimensions(Double_t* param)
                 virtual void SetPoints(Double_t* points) const
                 virtual void SetPoints(Float_t* points) const
                         void SetVertex(Double_t* vertex) const
                 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 fDx1  half length in X at lower Z surface (-dz)
          Double_t fDx2  half length in X at higher Z surface (+dz)
          Double_t fDy   half length in Y
          Double_t fDz   half length in Z

## Class Description

     TGeoTrd1 - a trapezoid with only x length varying with z. It has 4
       parameters, the half length in x at the low z surface, that at the
       high z surface, the half length in y, and in z

    _____________________________________________________________________________

/* */

TGeoTrd1()

     dummy ctor

TGeoTrd1(Double_t dx1, Double_t dx2, Double_t dy, Double_t dz) :TGeoBBox(0,0,0)

     constructor.

TGeoTrd1(const char *name, Double_t dx1, Double_t dx2, Double_t dy, Double_t dz) :TGeoBBox(name, 0,0,0)

     constructor.

TGeoTrd1(Double_t *param) :TGeoBBox(0,0,0)

     ctor with an array of parameters
     param[0] = dx1
     param[1] = dx2
     param[2] = dy
     param[3] = dz

~TGeoTrd1()

     destructor

void ComputeBBox()

     compute bounding box for a trd1

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

     Compute normal to closest surface from POINT.

Bool_t Contains(Double_t *point) const

     test if point is inside this shape
     check Z range

Double_t DistFromInside(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 trd1
     Boundary safe algorithm.

void GetVisibleCorner(Double_t *point, Double_t *vertex, Double_t *normals) const

     get the most visible corner from outside point and the normals

void GetOppositeCorner(Double_t * /*point*/, Int_t inorm, Double_t *vertex, Double_t *normals) const

     get the opposite corner of the intersected face

Double_t DistFromOutside(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 trd1
     Boundary safe algorithm

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

    --- Divide this trd1 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 Y divisions. For Z divisions just
     return the pointer to the volume to be divided. In case a wrong
     division axis is supplied, returns pointer to volume that was divided.

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

Int_t GetFittingBox(const TGeoBBox *parambox, TGeoMatrix *mat, Double_t &dx, Double_t &dy, Double_t &dz) const

     Fills real parameters of a positioned box inside this. Returns 0 if successfull.

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

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.

void SavePrimitive(ofstream &out, Option_t * /*option*/)

     Save a primitive as a C++ statement(s) on output stream "out".

void SetDimensions(Double_t *param)

     set trd1 params in one step :

void SetVertex(Double_t *vertex) const

     set vertex of a corner according to visibility flags

void SetPoints(Double_t *points) const

     create arb8 mesh points

void SetPoints(Float_t *points) const

     create arb8 mesh points

void Sizeof3D() const

     fill size of this 3-D object

### Inline Functions

                  Int_t GetByteCount() const
               Double_t GetDx1() const
               Double_t GetDx2() const
               Double_t GetDy() const
               Double_t GetDz() const
                  Int_t GetNmeshVertices() const
                 Bool_t IsCylType() const
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
               TGeoTrd1 TGeoTrd1(const TGeoTrd1&)
              TGeoTrd1& operator=(const TGeoTrd1&)

Author: Andrei Gheata 24/10/01
Last update: root/geom:$Name: $:$Id: TGeoTrd1.cxx,v 1.31 2005/05/13 16:20:38 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *