G4VRML2FileViewer.cc

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//
// $Id$
//
// 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 "G4ios.hh"

G4VRML2FileViewer::G4VRML2FileViewer(G4VRML2FileSceneHandler& sceneHandler,
                 const G4String& name) :
 G4VViewer(sceneHandler,
       sceneHandler.IncrementViewCount(),
       name),
 fSceneHandler(sceneHandler),
 fDest(sceneHandler.fDest)
{
    fViewHalfAngle = 0.5 * 0.785398 ; // 0.5 * 45*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;

}