library: libGeom #include "TGeoNode.h"

# TGeoNode

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

## class TGeoNode : public TNamed, public TGeoAtt

| Inheritance Chart:

`TObject`

<-

`TNamed`

`TGeoAtt`

<-

`TGeoNode`

<-

`TGeoNodeMatrix` |

`TGeoNodeOffset` |

This is an abstract class, constructors will not be documented.
Look at the header to check for available constructors.

        public:

                             virtual ~TGeoNode()
                        virtual void Browse(TBrowser* b)
                        virtual void cd() const
                                void CheckShapes()
                      static TClass* Class()
                        virtual void Draw(Option_t* option = "")
                                void DrawOnly(Option_t* option = "")
                                void DrawOverlaps()
                                void FillIdArray(Int_t& ifree, Int_t& nodeid, Int_t* array) const
                               Int_t FindNode(const TGeoNode* node, Int_t level)
                       virtual Int_t GetByteCount() const
                               Int_t GetColour() const
                           TGeoNode* GetDaughter(Int_t ind) const
          virtual TGeoPatternFinder* GetFinder() const
                       virtual Int_t GetIndex() const
                 virtual TGeoMatrix* GetMatrix() const
                         TGeoMedium* GetMedium() const
                         TGeoVolume* GetMotherVolume() const
                               Int_t GetNdaughters() const
                          TObjArray* GetNodes() const
                               Int_t GetNumber() const
                       virtual Int_t GetOptimalVoxels() const
                              Int_t* GetOverlaps(Int_t& novlp) const
                         TGeoVolume* GetVolume() const
                                void InspectNode() const
                     virtual TClass* IsA() const
                      virtual Bool_t IsFolder() const
                              Bool_t IsOffset() const
                              Bool_t IsOnScreen() const
                              Bool_t IsOverlapping() const
                              Bool_t IsVirtual() const
                              Bool_t IsVisDaughters() const
                              Bool_t IsVisible() const
                        virtual void LocalToMaster(const Double_t* local, Double_t* master) const
                        virtual void LocalToMasterVect(const Double_t* local, Double_t* master) const
                        virtual void ls(Option_t* option = "") const
                   virtual TGeoNode* MakeCopyNode() const
                        virtual void MasterToLocal(const Double_t* master, Double_t* local) const
                        virtual void MasterToLocalVect(const Double_t* master, Double_t* local) const
                           TGeoNode& operator=(const TGeoNode&)
                        virtual void Paint(Option_t* option = "")
                                void PrintCandidates() const
                                void PrintOverlaps() const
                            Double_t Safety(Double_t* point, Bool_t in = kTRUE) const
                                void SaveAttributes(ofstream& out)
                                void SetAllInvisible()
                                void SetCurrentPoint(Double_t x, Double_t y, Double_t z)
                                void SetInvisible()
                                void SetMotherVolume(const TGeoVolume* mother)
                                void SetNumber(Int_t number)
                                void SetOverlapping()
                                void SetOverlaps(Int_t* ovlp, Int_t novlp)
                                void SetVirtual()
                        virtual void SetVisibility(Bool_t vis = kTRUE)
                                void SetVolume(const TGeoVolume* volume)
                        virtual void ShowMembers(TMemberInspector& insp, char* parent)
                        virtual void Streamer(TBuffer& b)
                                void StreamerNVirtual(TBuffer& b)
                                void VisibleDaughters(Bool_t vis = kTRUE)

### Data Members

        protected:

          TGeoVolume* fVolume    volume associated with this
          TGeoVolume* fMother    mother volume
                Int_t fNumber    copy number
                Int_t fNovlp     number of overlaps
               Int_t* fOverlaps  [fNovlp] list of indices for overlapping brothers

        public:

          static const enum TGeoNode:: kGeoNodeMatrix
          static const enum TGeoNode:: kGeoNodeOffset
          static const enum TGeoNode:: kGeoNodeVC
          static const enum TGeoNode:: kGeoNodeOverlap

## Class Description

     TGeoNode
    _________
       A node represent a volume positioned inside another.They store links to both
     volumes and to the TGeoMatrix representing the relative positioning. Node are
     never instanciated directly by users, but created as a result of volume operations.
     Adding a volume named A with a given user ID inside a volume B will create a node
     node named A_ID. This will be added to the list of nodes stored by B. Also,
     when applying a division operation in N slices to a volume A, a list of nodes
     B_1, B_2, ..., B_N is also created. A node B_i does not represent a unique
     object in the geometry because its container A might be at its turn positioned
     as node inside several other volumes. Only when a complete branch of nodes
     is fully defined up to the top node in the geometry, a given path like:
           /TOP_1/.../A_3/B_7 will represent an unique object. Its global transformation
     matrix can be computed as the pile-up of all local transformations in its
     branch. We will therefore call "logical graph" the hierarchy defined by nodes
     and volumes. The expansion of the logical graph by all possible paths defines
     a tree sructure where all nodes are unique "touchable" objects. We will call
     this the "physical tree". Unlike the logical graph, the physical tree can
     become a huge structure with several milions of nodes in case of complex
     geometries, therefore it is not always a good idea to keep it transient
     in memory. Since a the logical and physical structures are correlated, the
     modeller rather keeps track only of the current branch, updating the current
     global matrix at each change of the level in geometry. The current physical node
     is not an object that can be asked for at a given moment, but rather represented
     by the combination: current node + current global matrix. However, physical nodes
     have unique ID's that can be retreived for a given modeler state. These can be
     fed back to the modeler in order to force a physical node to become current.
     The advantage of this comes from the fact that all navigation queries check
     first the current node, therefore knowing the location of a point in the
     geometry can be saved as a starting state for later use.

       Nodes can be declared as "overlapping" in case they do overlap with other
     nodes inside the same container or extrude this container. Non-overlapping
     nodes can be created with:

          TGeoVolume::AddNode(TGeoVolume *daughter, Int_t copy_No, TGeoMatrix *matr);

     The creation of overapping nodes can be done with a similar prototype:

          TGeoVolume::AddNodeOverlap(same arguments);

     When closing the geometry, overlapping nodes perform a check of possible
     overlaps with their neighbours. These are stored and checked all the time
     during navigation, therefore navigation is slower when embedding such nodes
     into geometry.

       Node have visualization attributes as volume have. When undefined by users,
     painting a node on a pad will take the corresponding volume attributes.

/* */

~TGeoNode()

     Destructor

void Browse(TBrowser *b)

Bool_t IsOnScreen() const

     check if this node is drawn. Assumes that this node is current

void InspectNode() const

void CheckShapes()

     check for wrong parameters in shapes

void DrawOnly(Option_t *option)

     draw only this node independently of its vis options

void Draw(Option_t *option)

     draw current node according to option

void DrawOverlaps()

void FillIdArray(Int_t &ifree, Int_t &nodeid, Int_t *array) const

     Fill array with node id. Recursive on node branch.

Int_t FindNode(const TGeoNode *node, Int_t level)

void SaveAttributes(ofstream &out)

     save attributes for this node

void MasterToLocal(const Double_t *master, Double_t *local) const

     Convert the point coordinates from mother reference to local reference system

void MasterToLocalVect(const Double_t *master, Double_t *local) const

     Convert a vector from mother reference to local reference system

void LocalToMaster(const Double_t *local, Double_t *master) const

     Convert the point coordinates from local reference system to mother reference

void LocalToMasterVect(const Double_t *local, Double_t *master) const

     Convert a vector from local reference system to mother reference

void ls(Option_t * /*option*/) const

     Print the path (A/B/C/...) to this node on stdout

void Paint(Option_t *option)

     Paint this node and its content according to visualization settings.

void PrintCandidates() const

     print daughters candidates for containing current point
       cd();

void PrintOverlaps() const

     print possible overlapping nodes

Double_t Safety(Double_t *point, Bool_t in) const

     computes the closest distance from given point to this shape

void SetOverlaps(Int_t *ovlp, Int_t novlp)

     set the list of overlaps for this node (ovlp must be created with operator new)

void SetVisibility(Bool_t vis)

void VisibleDaughters(Bool_t vis)

### Inline Functions

                          void cd() const
                         Int_t GetByteCount() const
                     TGeoNode* GetDaughter(Int_t ind) const
                   TGeoMatrix* GetMatrix() const
                         Int_t GetColour() const
                         Int_t GetIndex() const
            TGeoPatternFinder* GetFinder() const
                   TGeoMedium* GetMedium() const
                   TGeoVolume* GetMotherVolume() const
                         Int_t GetNdaughters() const
                    TObjArray* GetNodes() const
                         Int_t GetNumber() const
                        Int_t* GetOverlaps(Int_t& novlp) const
                   TGeoVolume* GetVolume() const
                         Int_t GetOptimalVoxels() const
                        Bool_t IsFolder() const
                        Bool_t IsOffset() const
                        Bool_t IsOverlapping() const
                        Bool_t IsVirtual() const
                        Bool_t IsVisible() const
                        Bool_t IsVisDaughters() const
                     TGeoNode* MakeCopyNode() const
                          void SetCurrentPoint(Double_t x, Double_t y, Double_t z)
                          void SetVolume(const TGeoVolume* volume)
                          void SetNumber(Int_t number)
                          void SetOverlapping()
                          void SetVirtual()
                          void SetInvisible()
                          void SetAllInvisible()
                          void SetMotherVolume(const TGeoVolume* mother)
                       TClass* Class()
                       TClass* IsA() const
                          void ShowMembers(TMemberInspector& insp, char* parent)
                          void Streamer(TBuffer& b)
                          void StreamerNVirtual(TBuffer& b)
                     TGeoNode& operator=(const TGeoNode&)

Author: Andrei Gheata 24/10/01
Last update: root/geom:$Name: $:$Id: TGeoNode.cxx,v 1.24 2005/04/01 13:53:17 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *