G4VRML2Viewer.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id$
//
// G4VRML2Viewer.cc
// Satoshi Tanaka & Yasuhide Sawada

#ifndef WIN32

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


//#define DEBUG_FR_VIEW

#include <cmath>

#include "G4VisManager.hh"
#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
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** 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
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** 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
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2Viewer::ClearView(): No effects" << G4endl;
#endif
}

void G4VRML2Viewer::ShowView(void)
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4VRML2Viewer::ShowView()" << G4endl;
#endif
        fSceneHandler.VRMLEndModeling();
}

void G4VRML2Viewer::FinishView(void)
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** 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
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** 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

---