Gabriele Cosmo
185 lines
6.7 KiB
C++
185 lines
6.7 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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// G4ScaleTransform
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//
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// Class description:
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//
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// A class for geometric scaling transformations.
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// Supports efficient arbitrary transformation of points, vectors and
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// normals and the computation of compound & inverse transformations.
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//
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// Interfaces to the CLHEP class G4ThreeVector
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//
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// For member function descriptions, see comments by declarations. For
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// additional clarification, also check the `const' declarations for
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// functions & their parameters.
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//
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// Member data:
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//
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// G4ThreeVector fScale; // scale transformation
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// G4ThreeVector fIScale; // inverse scale (avoid divisions)
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// G4double flFactor; // factor for conversion to local frame
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// G4double fgFactor; // factor for conversion to global frame
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// Author: Gabriele Cosmo (CERN), 18.02.2016 - Initial version
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// Evgueni Tcherniaev (CERN), 11.03.2016 - Added normals transforms
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// --------------------------------------------------------------------
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#ifndef G4SCALETRANSFORM_HH
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#define G4SCALETRANSFORM_HH
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#include "G4Types.hh"
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#include "G4ThreeVector.hh"
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#include "G4Transform3D.hh"
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/**
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* @brief G4ScaleTransform is a class for geometric scaling transformations.
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* It supports efficient arbitrary transformation of points, vectors and
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* normals and the computation of compound and inverse transformations.
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*/
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class G4ScaleTransform
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{
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public:
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/**
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* Default Constructor.
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*/
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inline G4ScaleTransform();
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/**
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* Constructor with scale parameters on each axis.
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* @param[in] sx Scaling in X.
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* @param[in] sy Scaling in Y.
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* @param[in] sz Scaling in Z.
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*/
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inline G4ScaleTransform(G4double sx, G4double sy, G4double sz);
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/**
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* Constructor taking a 3-vector.
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* @param[in] scale Scaling transformation.
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*/
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inline G4ScaleTransform(const G4ThreeVector& scale);
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/**
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* Constructor taking a Scale3D.
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* @param[in] scale Scaling transformation.
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*/
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inline G4ScaleTransform(const G4Scale3D& scale);
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/**
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* Copy constructor and assignment operator.
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*/
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inline G4ScaleTransform(const G4ScaleTransform& right);
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inline G4ScaleTransform& operator=(const G4ScaleTransform& right);
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/**
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* Updates the backed-up inverse scale and special conversion factors
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* based on the values of the scale. Needed at initialisation and
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* whenever the scale has changed value.
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*/
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inline void Init();
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/**
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* Accessors returning a reference to the scale and inverse scale
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* transformations.
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*/
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inline const G4ThreeVector& GetScale() const;
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inline const G4ThreeVector& GetInvScale() const;
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/**
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* Modifiers for the scale transformation.
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*/
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inline void SetScale(const G4ThreeVector& scale);
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inline void SetScale(const G4Scale3D& scale);
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inline void SetScale(G4double sx, G4double sy, G4double sz);
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/**
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* Methods to transform a point from global to local frame.
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*/
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inline void Transform(const G4ThreeVector& global,
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G4ThreeVector& local) const;
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inline G4ThreeVector Transform(const G4ThreeVector& global) const;
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/**
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* Methods to transform a point from local to global frame.
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*/
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inline void InverseTransform(const G4ThreeVector& local,
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G4ThreeVector& global) const;
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inline G4ThreeVector InverseTransform(const G4ThreeVector& local) const;
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/**
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* Methods to transform a normal from global to local frame.
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*/
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inline void TransformNormal(const G4ThreeVector& global,
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G4ThreeVector& local) const;
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inline G4ThreeVector TransformNormal(const G4ThreeVector& global) const;
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/**
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* Methods to transform a normal from local to global frame.
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*/
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inline void InverseTransformNormal(const G4ThreeVector& local,
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G4ThreeVector& global) const;
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inline G4ThreeVector InverseTransformNormal(const G4ThreeVector& local) const;
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/**
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* Transforms a distance 'dist' along a given direction 'dir'
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* from global to local frame.
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*/
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inline G4double TransformDistance(G4double dist,
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const G4ThreeVector& dir) const;
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/**
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* Transforms a 'safety' distance from global to local frame (conservative).
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*/
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inline G4double TransformDistance(G4double safety) const;
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/**
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* Transforms a distance 'dist' along a given direction 'dir'
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* from local to global frame.
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*/
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inline G4double InverseTransformDistance(G4double dist,
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const G4ThreeVector& dir) const;
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/**
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* Transforms a 'safety' distance from local to global frame (conservative).
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*/
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inline G4double InverseTransformDistance(G4double safety) const;
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private:
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G4ThreeVector fScale; // scale transformation
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G4ThreeVector fIScale; // inverse scale (avoid divisions)
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/** Conversion factors to local/global frames. */
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G4double flFactor = 1.0, fgFactor = 1.0;
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};
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std::ostream& operator<<(std::ostream& os, const G4ScaleTransform& scale);
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#include "G4ScaleTransform.icc"
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#endif
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