G4VRML2FileViewer.cc

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//
// G4VRML2FileViewer.cc
// Satoshi Tanaka & Yasuhide Sawada
 
//#define DEBUG_FR_VIEW
 
#include <cmath>
 
#include "G4VisManager.hh"
#include "G4Scene.hh"
#include "G4VRML2FileViewer.hh"
#include "G4VRML2FileSceneHandler.hh"
#include "G4VRML2File.hh"
#include "G4SystemOfUnits.hh"
#include "G4ios.hh"
 
G4VRML2FileViewer::G4VRML2FileViewer(G4VRML2FileSceneHandler& sceneHandler,
                                     const G4String& name)
  : G4VViewer(sceneHandler, sceneHandler.IncrementViewCount(), name)
  , fSceneHandler(sceneHandler)
  , fDest(sceneHandler.fDest)
{
  fViewHalfAngle = 30. * deg;
  fsin_VHA       = std::sin(fViewHalfAngle);
}
 
G4VRML2FileViewer::~G4VRML2FileViewer() {}
 
void G4VRML2FileViewer::SetView()
{
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2FileViewer::SetView(): No effects" << G4endl;
#endif
 
  // Do nothing, since VRML a browser is running as a different process.
  // SendViewParameters () will do this job instead.
}
 
void G4VRML2FileViewer::DrawView()
{
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2FileViewer::DrawView()" << G4endl;
#endif
 
  fSceneHandler.VRMLBeginModeling();
 
  // Viewpoint node
  SendViewParameters();
 
  // Here is a minimal DrawView() function.
  NeedKernelVisit();
  ProcessView();
  FinishView();
}
 
void G4VRML2FileViewer::ClearView(void)
{
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2File1View::ClearView()" << G4endl;
#endif
  if(fSceneHandler.fFlagDestOpen)
  {
    fSceneHandler.fDest.close();
    // Re-open with same filename...
    fSceneHandler.fDest.open(fSceneHandler.fVRMLFileName);
    fSceneHandler.fDest << "#VRML V2.0 utf8"
                        << "\n";
    fSceneHandler.fDest << "# Generated by VRML 2.0 driver of GEANT4\n"
                        << "\n";
  }
}
 
void G4VRML2FileViewer::ShowView(void)
{
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2FileViewer::ShowView()" << G4endl;
#endif
  fSceneHandler.VRMLEndModeling();
}
 
void G4VRML2FileViewer::FinishView(void)
{
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2FileViewer::FinishView(): No effects" << G4endl;
#endif
}
 
void G4VRML2FileViewer::SendViewParameters()
{
  // Calculates view representation based on extent of object being
  // viewed and (initial) direction of camera.  (Note: it can change
  // later due to user interaction via visualization system's GUI.)
 
#if defined DEBUG_FR_VIEW
  if(G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2FileViewer::SendViewParameters()\n";
#endif
 
  // error recovery
  if(fsin_VHA < 1.0e-6)
  {
    return;
  }
 
  // camera distance
  G4double extent_radius =
    fSceneHandler.GetScene()->GetExtent().GetExtentRadius();
  G4double camera_distance = extent_radius / fsin_VHA;
 
  // camera position on Z axis
  const G4Point3D& target_point =
    fSceneHandler.GetScene()->GetStandardTargetPoint() +
    fVP.GetCurrentTargetPoint();
  G4double E_z = target_point.z() + camera_distance;
  G4Point3D E(0.0, 0.0, E_z);
 
  // VRML codes are generated below
  fDest << G4endl;
  fDest << "#---------- CAMERA" << G4endl;
  fDest << "Viewpoint {" << G4endl;
  fDest << "\t"
        << "position ";
  fDest << E.x() << " ";
  fDest << E.y() << " ";
  fDest << E.z() << G4endl;
  fDest << "}" << G4endl;
  fDest << G4endl;
}