source: trunk/source/visualization/VRML/src/G4VRML2Viewer.cc @ 1202

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// $Id: G4VRML2Viewer.cc,v 1.12 2006/06/29 21:26:35 gunter Exp $
// GEANT4 tag $Name:  $
//
// G4VRML2Viewer.cc
// Satoshi Tanaka & Yasuhide Sawada

#ifndef WIN32

//=================//
#ifdef G4VIS_BUILD_VRML_DRIVER
//=================//


//#define DEBUG_FR_VIEW

#include <cmath>

#include "G4Scene.hh"
#include "G4VRML2Viewer.hh"
#include "G4VRML2SceneHandler.hh"
#include "G4VRML2.hh"
#include "G4ios.hh"

G4VRML2Viewer::G4VRML2Viewer(G4VRML2SceneHandler& 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 ) ;  
}

G4VRML2Viewer::~G4VRML2Viewer()
{}

void G4VRML2Viewer::SetView()
{
#if defined DEBUG_FR_VIEW
  G4cerr << "***** G4VRML2Viewer::SetView(): No effects" << G4endl;
#endif

// Do nothing, since VRML a browser is running as a different process.
// SendViewParameters () will do this job instead.

}


void G4VRML2Viewer::DrawView()
{
#if defined DEBUG_FR_VIEW
        G4cerr << "***** G4VRML2Viewer::DrawView()" << G4endl;
#endif
        fSceneHandler.VRMLBeginModeling() ;

        // Viewpoint node
        SendViewParameters(); 

        // Here is a minimal DrawView() function.
        NeedKernelVisit();
        ProcessView();
        FinishView();
}

void G4VRML2Viewer::ClearView(void)
{
#if defined DEBUG_FR_VIEW
  G4cerr << "***** G4VRML2Viewer::ClearView(): No effects" << G4endl;
#endif
}

void G4VRML2Viewer::ShowView(void)
{
#if defined DEBUG_FR_VIEW
  G4cerr << "***** G4VRML2Viewer::ShowView()" << G4endl;
#endif
        fSceneHandler.VRMLEndModeling();
}

void G4VRML2Viewer::FinishView(void)
{
#if defined DEBUG_FR_VIEW
  G4cerr << "***** G4VRML2Viewer::FinishView(): No effects" << G4endl;
#endif
}

void G4VRML2Viewer::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
      G4cerr << "***** G4VRML2Viewer::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 << "\n";
        fDest << "#---------- CAMERA" << "\n";
        fDest << "Viewpoint {"         << "\n";
        fDest << "\t" << "position "           ;
        fDest                 << E.x() << " "  ;
        fDest                 << E.y() << " "  ;
        fDest                 << E.z() << "\n" ;
        fDest << "}" << "\n";
        fDest << "\n";

} 



#endif
#endif //WIN32