source: trunk/source/geometry/management/src/G4ErrorCylSurfaceTarget.cc@ 1089

Last change on this file since 1089 was 1058, checked in by garnier, 17 years ago

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1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
6// * the Geant4 Collaboration. It is provided under the terms and *
7// * conditions of the Geant4 Software License, included in the file *
8// * LICENSE and available at http://cern.ch/geant4/license . These *
9// * include a list of copyright holders. *
10// * *
11// * Neither the authors of this software system, nor their employing *
12// * institutes,nor the agencies providing financial support for this *
13// * work make any representation or warranty, express or implied, *
14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
16// * for the full disclaimer and the limitation of liability. *
17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
21// * any work based on the software) you agree to acknowledge its *
22// * use in resulting scientific publications, and indicate your *
23// * acceptance of all terms of the Geant4 Software license. *
24// ********************************************************************
25//
26//
27// $Id: G4ErrorCylSurfaceTarget.cc,v 1.4 2007/06/20 12:50:48 arce Exp $
28// GEANT4 tag $Name: geant4-09-02-ref-02 $
29//
30//
31// --------------------------------------------------------------------
32// GEANT 4 class implementation file
33// --------------------------------------------------------------------
34
35#include "G4ErrorCylSurfaceTarget.hh"
36#include "G4GeometryTolerance.hh"
37
38#ifdef G4VERBOSE
39#include "G4ErrorPropagatorData.hh" //for verbosity checking
40#endif
41
42#include "geomdefs.hh"
43#include "G4Plane3D.hh"
44
45//---------------------------------------------------------------------
46
47G4ErrorCylSurfaceTarget::
48G4ErrorCylSurfaceTarget( const G4double& radius,
49 const G4ThreeVector& trans,
50 const G4RotationMatrix& rotm )
51 : fradius(radius)
52{
53 theType = G4ErrorTarget_CylindricalSurface;
54
55 ftransform = G4AffineTransform( rotm.inverse(), -trans );
56#ifdef G4VERBOSE
57 if(G4ErrorPropagatorData::verbose() >= 2 ) {
58 Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
59 }
60#endif
61}
62
63//---------------------------------------------------------------------
64
65G4ErrorCylSurfaceTarget::
66G4ErrorCylSurfaceTarget( const G4double& radius,
67 const G4AffineTransform& trans )
68 : fradius(radius), ftransform(trans.Inverse())
69{
70 theType = G4ErrorTarget_CylindricalSurface;
71
72#ifdef G4VERBOSE
73 if(G4ErrorPropagatorData::verbose() >= 2 )
74 {
75 Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
76 }
77#endif
78}
79
80//---------------------------------------------------------------------
81
82G4ErrorCylSurfaceTarget::~G4ErrorCylSurfaceTarget()
83{
84}
85
86//---------------------------------------------------------------------
87
88G4double G4ErrorCylSurfaceTarget::
89GetDistanceFromPoint( const G4ThreeVector& point,
90 const G4ThreeVector& dir ) const
91{
92 if( dir.mag() == 0. )
93 {
94 G4Exception("G4ErrorCylSurfaceTarget::GetDistanceFromPoint()",
95 "InvalidSetup", FatalException, "Direction is zero !");
96 }
97
98 //----- Get intersection point
99 G4ThreeVector localPoint = ftransform.TransformPoint( point );
100 G4ThreeVector localDir = ftransform.TransformAxis( dir );
101 G4ThreeVector inters = IntersectLocal(localPoint, localDir);
102
103 G4double dist = (localPoint-inters).mag();
104
105#ifdef G4VERBOSE
106 if(G4ErrorPropagatorData::verbose() >= 3 )
107 {
108 G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint():" << G4endl
109 << " Global point " << point << " dir " << dir << G4endl
110 << " Intersection " << inters << G4endl
111 << " Distance " << dist << G4endl;
112 Dump( " CylSurface: " );
113 }
114#endif
115
116 return dist;
117}
118
119
120//---------------------------------------------------------------------
121
122G4double G4ErrorCylSurfaceTarget::
123GetDistanceFromPoint( const G4ThreeVector& point ) const
124{
125 G4ThreeVector localPoint = ftransform.TransformPoint( point );
126
127#ifdef G4VERBOSE
128 if(G4ErrorPropagatorData::verbose() >= 3 )
129 {
130 G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint:" << G4endl
131 << " Global point " << point << G4endl
132 << " Distance " << fradius - localPoint.perp() << G4endl;
133 Dump( " CylSurface: " );
134 }
135#endif
136
137 return fradius - localPoint.perp();
138}
139
140//---------------------------------------------------------------------
141
142G4ThreeVector G4ErrorCylSurfaceTarget::
143IntersectLocal( const G4ThreeVector& localPoint,
144 const G4ThreeVector& localDir ) const
145{
146 G4double eqa = localDir.x()*localDir.x()+localDir.y()*localDir.y();
147 G4double eqb = 2*(localPoint.x()*localDir.x()+localPoint.y()*localDir.y());
148 G4double eqc = -fradius*fradius+localPoint.x()*localPoint.x()
149 +localPoint.y()*localPoint.y();
150 G4int inside = (localPoint.perp() > fradius) ? -1 : 1;
151 G4double lambda;
152
153 if( eqa*inside > 0. )
154 {
155 lambda = (-eqb + std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
156 }
157 else if( eqa*inside < 0. )
158 {
159 lambda = (-eqb - std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
160 }
161 else
162 {
163 if( eqb != 0. )
164 {
165 lambda = -eqc/eqb;
166 }
167 else
168 {
169 G4cerr << "WARNING - G4ErrorCylSurfaceTarget::IntersectLocal()" << G4endl
170 << " Point: " << localPoint << ", direction: "
171 << localDir << G4endl;
172 Dump( " CylSurface: " );
173 G4Exception("G4ErrorCylSurfaceTarget::IntersectLocal()",
174 "IllegalCondition",
175 JustWarning, "Intersection not possible !");
176 lambda = kInfinity;
177 }
178 }
179
180 G4ThreeVector inters = localPoint + lambda*localDir/localDir.mag();
181
182#ifdef G4VERBOSE
183 if(G4ErrorPropagatorData::verbose() >= 4 ) {
184 G4cout << " G4ErrorCylSurfaceTarget::IntersectLocal " << inters << " " << inters.perp() << " localPoint " << localPoint << " localDir " << localDir << G4endl;
185 }
186#endif
187
188 return inters;
189}
190
191//---------------------------------------------------------------------
192
193G4Plane3D G4ErrorCylSurfaceTarget::
194GetTangentPlane( const G4ThreeVector& point ) const
195{
196 G4ThreeVector localPoint = ftransform.TransformPoint( point );
197
198 // check that point is at cylinder surface
199 //
200 if( std::fabs( localPoint.perp() - fradius )
201 > 1000.*G4GeometryTolerance::GetInstance()->GetSurfaceTolerance() )
202 {
203 G4cerr << "WARNING - G4ErrorCylSurfaceTarget::GetTangentPlane()" << G4endl
204 << " Point: " << point << ", local: " << localPoint
205 << G4endl
206 << " is not at surface, but far away by: "
207 << localPoint.perp() - fradius << " !" << G4endl;
208 G4Exception("G4ErrorCylSurfaceTarget::GetTangentPlane()",
209 "IllegalCondition", JustWarning,
210 "Local point not at surface !");
211 }
212
213 G4Normal3D normal = localPoint - ftransform.NetTranslation();
214
215 return G4Plane3D( normal, point );
216}
217
218
219//---------------------------------------------------------------------
220
221void G4ErrorCylSurfaceTarget::Dump( const G4String& msg ) const
222{
223 G4cout << msg << " radius " << fradius
224 << " centre " << ftransform.NetTranslation()
225 << " rotation " << ftransform.NetRotation() << G4endl;
226}
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