Geant4_10
G4VRML2Viewer.cc
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27 // $Id: G4VRML2Viewer.cc 66373 2012-12-18 09:41:34Z gcosmo $
28 //
29 // G4VRML2Viewer.cc
30 // Satoshi Tanaka & Yasuhide Sawada
31 
32 #ifndef WIN32
33 
34 //=================//
35 #ifdef G4VIS_BUILD_VRML_DRIVER
36 //=================//
37 
38 
39 //#define DEBUG_FR_VIEW
40 
41 #include <cmath>
42 
43 #include "G4VisManager.hh"
44 #include "G4Scene.hh"
45 #include "G4VRML2Viewer.hh"
46 #include "G4VRML2SceneHandler.hh"
47 #include "G4VRML2.hh"
48 #include "G4ios.hh"
49 
50 G4VRML2Viewer::G4VRML2Viewer(G4VRML2SceneHandler& sceneHandler, const G4String& name) :
51  G4VViewer(sceneHandler,
52  sceneHandler.IncrementViewCount(),
53  name),
54  fSceneHandler(sceneHandler),
55  fDest(sceneHandler.fDest)
56 {
57  fViewHalfAngle = 0.5 * 0.785398 ; // 0.5 * 45*deg
58  fsin_VHA = std::sin ( fViewHalfAngle ) ;
59 }
60 
61 G4VRML2Viewer::~G4VRML2Viewer()
62 {}
63 
64 void G4VRML2Viewer::SetView()
65 {
66 #if defined DEBUG_FR_VIEW
68  G4cout << "***** G4VRML2Viewer::SetView(): No effects" << G4endl;
69 #endif
70 
71 // Do nothing, since VRML a browser is running as a different process.
72 // SendViewParameters () will do this job instead.
73 
74 }
75 
76 
77 void G4VRML2Viewer::DrawView()
78 {
79 #if defined DEBUG_FR_VIEW
81  G4cout << "***** G4VRML2Viewer::DrawView()" << G4endl;
82 #endif
83  fSceneHandler.VRMLBeginModeling() ;
84 
85  // Viewpoint node
86  SendViewParameters();
87 
88  // Here is a minimal DrawView() function.
89  NeedKernelVisit();
90  ProcessView();
91  FinishView();
92 }
93 
94 void G4VRML2Viewer::ClearView(void)
95 {
96 #if defined DEBUG_FR_VIEW
98  G4cout << "***** G4VRML2Viewer::ClearView(): No effects" << G4endl;
99 #endif
100 }
101 
102 void G4VRML2Viewer::ShowView(void)
103 {
104 #if defined DEBUG_FR_VIEW
106  G4cout << "***** G4VRML2Viewer::ShowView()" << G4endl;
107 #endif
108  fSceneHandler.VRMLEndModeling();
109 }
110 
111 void G4VRML2Viewer::FinishView(void)
112 {
113 #if defined DEBUG_FR_VIEW
115  G4cout << "***** G4VRML2Viewer::FinishView(): No effects" << G4endl;
116 #endif
117 }
118 
119 void G4VRML2Viewer::SendViewParameters ()
120 {
121  // Calculates view representation based on extent of object being
122  // viewed and (initial) direction of camera. (Note: it can change
123  // later due to user interaction via visualization system's GUI.)
124 
125 #if defined DEBUG_FR_VIEW
127  G4cout << "***** G4VRML2Viewer::SendViewParameters()\n";
128 #endif
129  // error recovery
130  if ( fsin_VHA < 1.0e-6 ) { return ; }
131 
132  // camera distance
133  G4double extent_radius = fSceneHandler.GetScene()->GetExtent().GetExtentRadius();
134  G4double camera_distance = extent_radius / fsin_VHA ;
135 
136  // camera position on Z axis
137  const G4Point3D& target_point
138  = fSceneHandler.GetScene()->GetStandardTargetPoint()
139  + fVP.GetCurrentTargetPoint();
140  G4double E_z = target_point.z() + camera_distance;
141  G4Point3D E(0.0, 0.0, E_z );
142 
143  // VRML codes are generated below
144  fDest << "\n";
145  fDest << "#---------- CAMERA" << "\n";
146  fDest << "Viewpoint {" << "\n";
147  fDest << "\t" << "position " ;
148  fDest << E.x() << " " ;
149  fDest << E.y() << " " ;
150  fDest << E.z() << "\n" ;
151  fDest << "}" << "\n";
152  fDest << "\n";
153 
154 }
155 
156 
157 
158 #endif
159 #endif //WIN32
const XML_Char * name
Definition: expat.h:151
G4GLOB_DLL std::ostream G4cout
static Verbosity GetVerbosity()
#define G4endl
Definition: G4ios.hh:61
double G4double
Definition: G4Types.hh:76