library: libGeom #include "TGeoHalfSpace.h"

# TGeoHalfSpace

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

## class TGeoHalfSpace : public TGeoBBox

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

        public:

                              TGeoHalfSpace()
                              TGeoHalfSpace(const char* name, Double_t* p, Double_t* n)
                              TGeoHalfSpace(Double_t* params)
                              TGeoHalfSpace(const TGeoHalfSpace&)
                      virtual ~TGeoHalfSpace()
               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 Int_t DistancetoPrimitive(Int_t px, Int_t py)
             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 void GetBoundingCylinder(Double_t*) const
           virtual TGeoShape* GetMakeRuntimeShape(TGeoShape*, TGeoMatrix*) const
                virtual Int_t GetNmeshVertices() const
            virtual Double_t* GetNorm()
            virtual Double_t* GetPoint()
                 virtual void InspectShape() const
              virtual TClass* IsA() const
               virtual Bool_t IsCylType() const
               TGeoHalfSpace& operator=(const TGeoHalfSpace&)
             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*) const
                 virtual void SetPoints(Float_t*) const
                 virtual void ShowMembers(TMemberInspector& insp, char* parent)
                 virtual void Sizeof3D() const
                 virtual void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)

### Data Members

        private:

          Double_t fP[3]
          Double_t fN[3]

## Class Description

     TGeoHalfSpace - A half-space defined by:
                p[3] - an arbitrary point on the plane
                n[3] - normal at the plane in point P
        A half-space is not really a shape, because it is infinite. The normal
        points "outside" the half-space
    _____________________________________________________________________________

TGeoHalfSpace()

     Dummy constructor

TGeoHalfSpace(const char *name, Double_t *p, Double_t *n) :TGeoBBox(name, 0,0,0)

     Constructor with name, point on the plane and normal

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

     Default constructor specifying minimum and maximum radius

~TGeoHalfSpace()

     destructor

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 the half-space

Int_t DistancetoPrimitive(Int_t /*px*/, Int_t /*py*/)

     A half-space does not have a mesh primitive

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 the plane

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

     compute distance from inside point to the plane

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

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)

### Inline Functions

                      void ComputeBBox()
                 Double_t* GetPoint()
                 Double_t* GetNorm()
                      void GetBoundingCylinder(Double_t*) const
                TGeoShape* GetMakeRuntimeShape(TGeoShape*, TGeoMatrix*) const
                     Int_t GetNmeshVertices() const
                    Bool_t IsCylType() const
                      void SetPoints(Double_t*) const
                      void SetPoints(Float_t*) const
                      void Sizeof3D() const
                   TClass* Class()
                   TClass* IsA() const
                      void ShowMembers(TMemberInspector& insp, char* parent)
                      void Streamer(TBuffer& b)
                      void StreamerNVirtual(TBuffer& b)
             TGeoHalfSpace TGeoHalfSpace(const TGeoHalfSpace&)
            TGeoHalfSpace& operator=(const TGeoHalfSpace&)

Author: Mihaela Gheata 03/08/04
Last update: :$Name: $:$Id: TGeoHalfSpace.cxx,v 1.8 2005/05/13 16:20:38 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *