library: libGeom
#include "TGeoNode.h"


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

class TGeoNodeOffset : public TGeoNode

Inheritance Chart:

TGeoNodeOffset() TGeoNodeOffset(const TGeoVolume* vol, Int_t index, Double_t offset) TGeoNodeOffset(const TGeoNodeOffset&) virtual ~TGeoNodeOffset() virtual void cd() const static TClass* Class() virtual TGeoPatternFinder* GetFinder() const virtual Int_t GetIndex() const virtual TGeoMatrix* GetMatrix() const Double_t GetOffset() const virtual TClass* IsA() const virtual TGeoNode* MakeCopyNode() const TGeoNodeOffset& operator=(const TGeoNodeOffset&) void SetFinder(const TGeoPatternFinder* finder) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

Data Members

Double_t fOffset X offset for this node with respect to its mother Int_t fIndex index of this node in the division TGeoPatternFinder* fFinder finder for this node

Class Description

   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.

/* */

 Default constructor

TGeoNodeOffset(const TGeoVolume *vol, Int_t index, Double_t offset) : TGeoNode(vol)
 Constructor. Null pointer to matrix means identity transformation


Int_t GetIndex() const

TGeoNode* MakeCopyNode() const
 make a copy of this node

Inline Functions

                      void cd() const
                  Double_t GetOffset() const
        TGeoPatternFinder* GetFinder() const
               TGeoMatrix* GetMatrix() const
                      void SetFinder(const TGeoPatternFinder* finder)
                   TClass* Class()
                   TClass* IsA() const
                      void ShowMembers(TMemberInspector& insp, char* parent)
                      void Streamer(TBuffer& b)
                      void StreamerNVirtual(TBuffer& b)
            TGeoNodeOffset TGeoNodeOffset(const TGeoNodeOffset&)
           TGeoNodeOffset& operator=(const TGeoNodeOffset&)

Author: Andrei Gheata 24/10/01
Last update: root/geom:$Name: $:$Id: TGeoNode.cxx,v 1.25 2005/09/02 13:54:38 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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