Gabriele Cosmo
158 lines
4.6 KiB
C++
158 lines
4.6 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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// $Id: G4EnclosingCylinder.cc,v 1.9 2006/06/29 18:48:33 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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//
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// --------------------------------------------------------------------
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// GEANT 4 class source file
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//
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//
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// G4EnclosingCylinder.cc
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//
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// Implementation of a utility class for a quick check of geometry.
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//
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// --------------------------------------------------------------------
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#include "G4EnclosingCylinder.hh"
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#include "G4ReduciblePolygon.hh"
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//
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// Constructor
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//
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G4EnclosingCylinder::G4EnclosingCylinder( const G4ReduciblePolygon *rz,
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G4bool thePhiIsOpen,
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G4double theStartPhi,
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G4double theTotalPhi )
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: startPhi(theStartPhi), totalPhi(theTotalPhi),
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rx1(0.), ry1(0.), dx1(0.), dy1(0.),
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rx2(0.), ry2(0.), dx2(0.), dy2(0.),
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concave(theTotalPhi > pi)
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{
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//
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// Obtain largest r and smallest and largest z
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//
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radius = rz->Amax();
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zHi = rz->Bmax();
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zLo = rz->Bmin();
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//
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// Save phi info
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//
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phiIsOpen = thePhiIsOpen;
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if ( phiIsOpen )
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{
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rx1 = std::cos(startPhi);
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ry1 = std::sin(startPhi);
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dx1 = +ry1*10*kCarTolerance;
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dy1 = -rx1*10*kCarTolerance;
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rx2 = std::cos(startPhi+totalPhi);
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ry2 = std::sin(startPhi+totalPhi);
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dx2 = -ry2*10*kCarTolerance;
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dy2 = +rx2*10*kCarTolerance;
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}
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//
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// Add safety
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//
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radius += 10*kCarTolerance;
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zLo -= 10*kCarTolerance;
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zHi += 10*kCarTolerance;
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}
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//
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// Fake default constructor - sets only member data and allocates memory
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// for usage restricted to object persistency.
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//
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G4EnclosingCylinder::G4EnclosingCylinder( __void__& )
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{
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}
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//
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// Destructor
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//
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G4EnclosingCylinder::~G4EnclosingCylinder()
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{
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}
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//
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// Outside
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//
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// Decide very rapidly if the point is outside the cylinder
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//
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// If one is not certain, return false
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//
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G4bool G4EnclosingCylinder::MustBeOutside( const G4ThreeVector &p ) const
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{
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if (p.perp() > radius) return true;
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if (p.z() < zLo) return true;
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if (p.z() > zHi) return true;
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if (phiIsOpen)
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{
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if (concave)
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{
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if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) < 0) return false;
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if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) > 0) return false;
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}
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else
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{
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if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) > 0) return true;
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if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) < 0) return true;
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}
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}
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return false;
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}
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//
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// Misses
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//
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// Decide very rapidly if the trajectory is going to miss the cylinder
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//
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// If one is not sure, return false
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//
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G4bool G4EnclosingCylinder::ShouldMiss( const G4ThreeVector &p,
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const G4ThreeVector &v ) const
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{
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if (!MustBeOutside(p)) return false;
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G4double cross = p.x()*v.y() - p.y()*v.x();
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if (cross > radius) return true;
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if (p.perp() > radius)
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{
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G4double dot = p.x()*v.x() + p.y()*v.y();
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if (dot > 0) return true;
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}
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return false;
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}
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