Gabriele Cosmo
143 lines
5.5 KiB
C++
143 lines
5.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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//
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// class G4VTouchable
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//
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// Class description:
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//
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// Base class for `touchable' objects capable of maintaining an
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// association between parts of the geometrical hierarchy (volumes
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// &/or solids) and their resultant transformation.
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//
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// Utilisation:
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// -----------
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// A touchable is a geometrical volume (solid) which has a unique
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// placement in a detector description. It is an abstract base class which
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// can be implemented in a variety of ways. Each way must provide the
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// capabilities of obtaining the transformation and solid that is described
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// by the touchable.
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//
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// All G4VTouchable implementations must respond to the two following
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// "requests":
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//
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// 1) GetTranslation and GetRotation that return the components of the
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// volume's transformation.
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//
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// 2) GetSolid that gives the solid of this touchable.
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//
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//
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// Additional capabilities are available from implementations with more
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// information. These have a default implementation that causes an exception.
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//
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// Several capabilities are available from touchables with physical volumes:
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//
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// 3) GetVolume gives the physical volume.
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//
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// 4) GetReplicaNumber or GetCopyNumber gives the copy number of the
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// physical volume, either if it is replicated or not.
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//
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// Touchables that store volume hierarchy (history) have the whole stack of
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// parent volumes available. Thus it is possible to add a little more state
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// in order to extend its functionality. We add a "pointer" to a level and a
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// member function to move the level in this stack. Then calling the above
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// member functions for another level, the information for that level can be
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// retrieved.
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//
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// The top of the history tree is, by convention, the world volume.
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//
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// 5) GetHistoryDepth gives the depth of the history tree.
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//
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// 6) GetReplicaNumber/GetCopyNumber, GetVolume, GetTranslation and
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// GetRotation each can be called with a depth argument.
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// They return the value of the respective level of the touchable.
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//
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// 7) MoveUpHistory(num) moves the current pointer inside the touchable
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// to point "num" levels up the history tree. Thus, eg, calling
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// it with num=1 will cause the internal pointer to move to the mother
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// of the current volume.
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// NOTE: this method MODIFIES the touchable.
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//
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// An update method, with different arguments is available, so that the
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// information in a touchable can be updated:
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//
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// 8) UpdateYourself takes a physical volume pointer and can additionally
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// take a NavigationHistory.
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// History:
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// Created: Paul Kent, August 1996
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// --------------------------------------------------------------------
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#ifndef G4VTOUCHABLE_HH
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#define G4VTOUCHABLE_HH
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#include "G4Types.hh"
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class G4VPhysicalVolume;
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class G4VSolid;
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class G4NavigationHistory;
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#include "G4RotationMatrix.hh"
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#include "G4ThreeVector.hh"
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class G4VTouchable
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{
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public: // with description
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G4VTouchable();
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virtual ~G4VTouchable();
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// Constructor and destructor.
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virtual const G4ThreeVector& GetTranslation(G4int depth=0) const = 0;
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virtual const G4RotationMatrix* GetRotation(G4int depth=0) const = 0;
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// Accessors for translation and rotation.
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virtual G4VPhysicalVolume* GetVolume(G4int depth=0) const;
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virtual G4VSolid* GetSolid(G4int depth=0) const;
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// Accessors for physical volumes and solid.
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virtual G4int GetReplicaNumber(G4int depth=0) const;
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inline G4int GetCopyNumber(G4int depth=0) const;
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virtual G4int GetHistoryDepth() const;
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virtual G4int MoveUpHistory(G4int num_levels=1);
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// Methods for touchables with history.
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virtual void UpdateYourself(G4VPhysicalVolume* pPhysVol,
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const G4NavigationHistory* history=0);
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// Update method.
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public: // without description
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// virtual void ResetLevel();
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virtual const G4NavigationHistory* GetHistory() const;
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// Should this method be deprecated ? It is used in G4Navigator!
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};
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#include "G4VTouchable.icc"
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#endif
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