Gabriele Cosmo
169 lines
6.3 KiB
C++
169 lines
6.3 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4AffineTransform.hh,v 1.5 2003/11/02 14:01:21 gcosmo Exp $
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// GEANT4 tag $Name: geant4-06-00-patch-01 $
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//
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//
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// class G4AffineTransform
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//
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// Class description:
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//
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// A class for geometric affine transformations [see, eg. Foley & Van Dam]
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// Supports efficient arbitrary rotation & transformation of vectors and the
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// computation of compound & inverse transformations. A `rotation flag' is
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// maintained internally for greater computational efficiency for transforms
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// that do not involve rotation.
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//
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// Interfaces to the CLHEP classes G4ThreeVector & G4RotationMatrix
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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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// G4double rxx,rxy,rxz;
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// G4double ryx,ryy,ryz; A 3x3 rotation matrix - net rotation
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// G4double rzx,rzy,rzz;
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// G4double tx,ty,tz; Net translation
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// History:
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// Paul R C Kent 6 Aug 1996 - initial version
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//
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// 19.09.96 E.Chernyaev:
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// - direct access to the protected members of the G4RotationMatrix class
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// replaced by access via public access functions
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// - conversion of the rotation matrix to angle & axis used to get
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// a possibility to remove "friend" from the G4RotationMatrix class
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// --------------------------------------------------------------------
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#ifndef G4AFFINETRANSFORM_HH
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#define G4AFFINETRANSFORM_HH
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#include "G4Types.hh"
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#include "G4ThreeVector.hh"
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#include "G4RotationMatrix.hh"
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class G4AffineTransform
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{
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public:
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G4AffineTransform();
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public: // with description
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G4AffineTransform(const G4ThreeVector &tlate);
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// Translation only: under t'form translate point at origin by tlate
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G4AffineTransform(const G4RotationMatrix &rot);
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// Rotation only: under t'form rotate by rot
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G4AffineTransform(const G4RotationMatrix &rot,
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const G4ThreeVector &tlate);
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// Under t'form: rotate by rot then translate by tlate
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G4AffineTransform(const G4RotationMatrix *rot,
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const G4ThreeVector &tlate);
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// Optionally rotate by *rot then translate by tlate - rot may be null
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G4AffineTransform operator * (const G4AffineTransform &tf) const;
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// Compound Transforms:
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// tf2=tf2*tf1 equivalent to tf2*=tf1
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// Returns compound transformation of self*tf
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G4AffineTransform& operator *= (const G4AffineTransform &tf);
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// (Modifying) Multiplies self by tf; Returns self reference
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// ie. A=AB for a*=b
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G4AffineTransform& Product(const G4AffineTransform &tf1,
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const G4AffineTransform &tf2);
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// 'Products' for avoiding (potential) temporaries:
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// c.Product(a,b) equivalent to c=a*b
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// c.InverseProduct(a*b,b ) equivalent to c=a
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// (Modifying) Sets self=tf1*tf2; Returns self reference
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G4AffineTransform& InverseProduct(const G4AffineTransform &tf1,
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const G4AffineTransform &tf2);
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// (Modifying) Sets self=tf1*(tf2^-1); Returns self reference
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G4ThreeVector TransformPoint(const G4ThreeVector &vec) const;
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// Transform the specified point: returns vec*rot+tlate
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G4ThreeVector TransformAxis(const G4ThreeVector &axis) const;
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// Transform the specified axis: returns
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void ApplyPointTransform(G4ThreeVector &vec) const;
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// Transform the specified point (in place): sets vec=vec*rot+tlate
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void ApplyAxisTransform(G4ThreeVector &axis) const;
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// Transform the specified axis (in place): sets axis=axis*rot;
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G4AffineTransform Inverse() const;
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// Return inverse of current transform
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G4AffineTransform& Invert();
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// (Modifying) Sets self=inverse of self; Returns self reference
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G4AffineTransform& operator +=(const G4ThreeVector &tlate);
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G4AffineTransform& operator -=(const G4ThreeVector &tlate);
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// (Modifying) Adjust net translation by given vector;
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// Returns self reference
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G4bool operator == (const G4AffineTransform &tf) const;
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G4bool operator != (const G4AffineTransform &tf) const;
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G4double operator [] (const G4int n) const;
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G4bool IsRotated() const;
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// True if transform includes rotation
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G4bool IsTranslated() const;
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// True if transform includes translation
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G4RotationMatrix NetRotation() const;
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G4ThreeVector NetTranslation() const;
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void SetNetRotation(const G4RotationMatrix &rot);
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void SetNetTranslation(const G4ThreeVector &tlate);
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private:
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G4AffineTransform(const G4double prxx,const G4double prxy,const G4double prxz,
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const G4double pryx,const G4double pryy,const G4double pryz,
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const G4double przx,const G4double przy,const G4double przz,
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const G4double ptx, const G4double pty, const G4double ptz );
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G4double rxx,rxy,rxz;
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G4double ryx,ryy,ryz;
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G4double rzx,rzy,rzz;
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G4double tx,ty,tz;
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};
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#include "G4AffineTransform.icc"
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#endif
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