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1 //
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25 //
26 //
27 //
28 // G4VRML2FileViewer.cc
29 // Satoshi Tanaka & Yasuhide Sawada
30
31 //#define DEBUG_FR_VIEW
32
33 #include <cmath>
34
35 #include "G4VisManager.hh"
36 #include "G4Scene.hh"
37 #include "G4VRML2FileViewer.hh"
38 #include "G4VRML2FileSceneHandler.hh"
39 #include "G4VRML2File.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4ios.hh"
42
43 G4VRML2FileViewer::G4VRML2FileViewer(G4VRML2FileSceneHandler& sceneHandler,
44 const G4String& name)
45 : G4VViewer(sceneHandler, sceneHandler.IncrementViewCount(), name)
46 , fSceneHandler(sceneHandler)
47 , fDest(sceneHandler.fDest)
48 {
49 fViewHalfAngle = 30. * deg;
50 fsin_VHA = std::sin(fViewHalfAngle);
51 }
52
53 G4VRML2FileViewer::~G4VRML2FileViewer() {}
54
55 void G4VRML2FileViewer::SetView()
56 {
57 #if defined DEBUG_FR_VIEW
58 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
59 G4cout << "***** G4VRML2FileViewer::SetView(): No effects" << G4endl;
60 #endif
61
62 // Do nothing, since VRML a browser is running as a different process.
63 // SendViewParameters () will do this job instead.
64 }
65
66 void G4VRML2FileViewer::DrawView()
67 {
68 #if defined DEBUG_FR_VIEW
69 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
70 G4cout << "***** G4VRML2FileViewer::DrawView()" << G4endl;
71 #endif
72
73 fSceneHandler.VRMLBeginModeling();
74
75 // Viewpoint node
76 SendViewParameters();
77
78 // Here is a minimal DrawView() function.
79 NeedKernelVisit();
80 ProcessView();
81 FinishView();
82 }
83
84 void G4VRML2FileViewer::ClearView(void)
85 {
86 #if defined DEBUG_FR_VIEW
87 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
88 G4cout << "***** G4VRML2File1View::ClearView()" << G4endl;
89 #endif
90 if(fSceneHandler.fFlagDestOpen)
91 {
92 fSceneHandler.fDest.close();
93 // Re-open with same filename...
94 fSceneHandler.fDest.open(fSceneHandler.fVRMLFileName);
95 fSceneHandler.fDest << "#VRML V2.0 utf8"
96 << "\n";
97 fSceneHandler.fDest << "# Generated by VRML 2.0 driver of GEANT4\n"
98 << "\n";
99 }
100 }
101
102 void G4VRML2FileViewer::ShowView(void)
103 {
104 #if defined DEBUG_FR_VIEW
105 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
106 G4cout << "***** G4VRML2FileViewer::ShowView()" << G4endl;
107 #endif
108 fSceneHandler.VRMLEndModeling();
109 }
110
111 void G4VRML2FileViewer::FinishView(void)
112 {
113 #if defined DEBUG_FR_VIEW
114 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
115 G4cout << "***** G4VRML2FileViewer::FinishView(): No effects" << G4endl;
116 #endif
117 }
118
119 void G4VRML2FileViewer::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
126 if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
127 G4cout << "***** G4VRML2FileViewer::SendViewParameters()\n";
128 #endif
129
130 // error recovery
131 if(fsin_VHA < 1.0e-6)
132 {
133 return;
134 }
135
136 // camera distance
137 G4double extent_radius =
138 fSceneHandler.GetScene()->GetExtent().GetExtentRadius();
139 G4double camera_distance = extent_radius / fsin_VHA;
140
141 // camera position on Z axis
142 const G4Point3D& target_point =
143 fSceneHandler.GetScene()->GetStandardTargetPoint() +
144 fVP.GetCurrentTargetPoint();
145 G4double E_z = target_point.z() + camera_distance;
146 G4Point3D E(0.0, 0.0, E_z);
147
148 // VRML codes are generated below
149 fDest << G4endl;
150 fDest << "#---------- CAMERA" << G4endl;
151 fDest << "Viewpoint {" << G4endl;
152 fDest << "\t"
153 << "position ";
154 fDest << E.x() << " ";
155 fDest << E.y() << " ";
156 fDest << E.z() << G4endl;
157 fDest << "}" << G4endl;
158 fDest << G4endl;
159 }
160