G4FukuiRendererViewer.cc

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// Satoshi TANAKA, Fri Jun 28 12:09:11 JST 1996
// FukuiRenderer view - opens window, hard copy, etc.


//=================//
#ifdef G4VIS_BUILD_DAWN_DRIVER
//=================//

#define __G_ANSI_C__
#define G4FukuiRenderer_STRUCTURE_PRIORITY  1.

// #define DEBUG_FR_VIEW

#include "G4ios.hh"
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "G4VisManager.hh"
#include "G4Scene.hh"
#include "G4Vector3D.hh"
#include "G4VisExtent.hh"
#include "G4LogicalVolume.hh"
#include "G4VSolid.hh"
#include "G4PhysicalConstants.hh"

#include "G4FRConst.hh"
#include "G4FukuiRenderer.hh"
#include "G4FukuiRendererSceneHandler.hh"
#include "G4FukuiRendererViewer.hh"


//----- Constructor
G4FukuiRendererViewer::G4FukuiRendererViewer (G4FukuiRendererSceneHandler& sceneHandler,
            const G4String& name): 
  G4VViewer (sceneHandler,
       sceneHandler.IncrementViewCount (),
       name),
  fSceneHandler (sceneHandler)
{}

//----- Destructor
G4FukuiRendererViewer::~G4FukuiRendererViewer () 
{}

//----- 
void G4FukuiRendererViewer::SetView () 
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4FukuiRendererViewer::SetView(): No effects" << G4endl;
#endif 
// Do nothing, since DAWN is running as a different process.
// SendViewParameters () will do this job instead.
}

//----- 
void
G4FukuiRendererViewer::ClearView( void )
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
    G4cout << "***** G4FukuiRendererViewer::ClearView (): No effects " << G4endl;
#endif

}


//----- 
void G4FukuiRendererViewer::DrawView () 
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::DrawView () " << G4endl;
#endif

  //----- Begin modeling 3D 
  fSceneHandler.FRBeginModeling();  

  //----- Always visit G4 kernel 
  NeedKernelVisit ();
                             
  //----- Draw
  ProcessView () ;

} 


//----- 
void G4FukuiRendererViewer::ShowView( void )
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::ShowView () " << G4endl;
#endif

  if( fSceneHandler.FRIsInModeling() ) 
  {
      //----- End of modeling
      // !EndModeling, !DrawAll, !CloseDevice,
      // close g4.prim
    fSceneHandler.FREndModeling();

      //----- Wait user clicks drawing Area
    this->Wait();
  }

} 


//----- 
void  G4FukuiRendererViewer::Wait()
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::Wait () : Begin" << G4endl;
#endif
  fSceneHandler.SendStr    ( FR_WAIT );
  fSceneHandler.GetPrimDest().WaitSendBack( FR_WAIT );
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::Wait () : end" << G4endl;
#endif

}


//----- 
void
G4FukuiRendererViewer::SendDevice( FRDEV dev )
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::SendDevice() " << G4endl;
#endif

  //  enum {PS=1, XWIN=2, PS2=3, XWIN2=4, OPEN_GL=5, DEVICE_END=6};
  
  if( dev >= FRDEV_PS || dev < FRDEV_DEVICE_END ) {
    fSceneHandler.SendStrInt ( FR_DEVICE, dev );
  }
}


//----- 
void  G4FukuiRendererViewer::SendDrawingStyle() 
{
#if defined DEBUG_FR_VIEW
  if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
  G4cout << "***** G4FukuiRendererViewer::SendDrawingStyle() " << G4endl;
#endif

  G4int  style = fVP.GetDrawingStyle();

  switch( style )
  {
    case G4ViewParameters::wireframe: 
    fSceneHandler.SendStr( FR_WIREFRAME );
    break;
    case G4ViewParameters::hlr:
    fSceneHandler.SendStr( FR_LINES     );
    break;
    case G4ViewParameters::hsr:
    case G4ViewParameters::hlhsr:
    fSceneHandler.SendStr( FR_SURFACE   );
    break;
    default:
    fSceneHandler.SendStr( FR_WIREFRAME );
    break;
  }

} 


//----- 
void G4FukuiRendererViewer::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 << "***** G4FukuiRendererViewer::SendViewParameters()" << G4endl;
#endif 

    //----- Magic number to decide camera distance automatically
  const    G4double        HOW_FAR            = 1000.0       ; // to define "infinity"
  const    G4double        MIN_HALF_ANGLE     = 0.01         ;
  const    G4double        MAX_HALF_ANGLE     = 0.499 * pi ;

    //----- (2A) CALC camera distance
    //..... Note: Camera cannot enter inside object
  G4double  camera_distance ;
  G4double  radius = fSceneHandler.GetScene()->GetExtent().GetExtentRadius();

  G4double half_view_angle  = std::fabs ( fVP.GetFieldHalfAngle () ) ;
  if( half_view_angle > MAX_HALF_ANGLE ) { 
    half_view_angle = MAX_HALF_ANGLE ; 
  } 

  if( half_view_angle < MIN_HALF_ANGLE ) {
      //----- infinity (or ortho projection)
    camera_distance = radius * HOW_FAR ;  
  } else {
      //----- Calc camera distance from half view angle
    camera_distance = radius / std::sin ( half_view_angle );
    camera_distance -= fVP.GetDolly();
  }

  if ( camera_distance < radius ) { 
    if (G4VisManager::GetVerbosity() >= G4VisManager::errors) {
    G4cout << "WARNING from FukuiRenderer (DAWN) driver:" << G4endl;
    G4cout << "  Camera cannot enter inside objects"      << G4endl;
    }
    camera_distance = radius ; 
  }

    //----- (3A) CALC camera direction
  const G4Vector3D& camera_direction \
    = fVP.GetViewpointDirection().unit();
  const G4double v_angle =  (180.0 / pi) * camera_direction.theta() ;
  const G4double h_angle =  (180.0 / pi) * camera_direction.phi  () ;

    //----- (2B), (3B) SEND camera position
  fSceneHandler.SendStrDouble3( FR_CAMERA_POSITION, 
             camera_distance, 
             v_angle, 
             h_angle ); 

    //----- (4A) CALC target point
  const G4Point3D&  target_point
    = fSceneHandler.GetScene()->GetStandardTargetPoint()
    + fVP.GetCurrentTargetPoint();

    //----- (4B) SEND target point
  fSceneHandler.SendStrDouble3( FR_TARGET_POINT, 
             target_point.x(), 
             target_point.y(), 
             target_point.z() );

    //----- (5A) CALC zoom factor
  const G4double   zoom_factor  = fVP.GetZoomFactor();

    //----- (5B) SEND zoom factor or focal length
  if( half_view_angle < MIN_HALF_ANGLE ) {

    const G4Point3D&  std_target_point \
        = fSceneHandler.GetScene()->GetStandardTargetPoint();

    fSceneHandler.SendStrDouble4( FR_ZOOM_FACTOR, 
               zoom_factor ,
               std_target_point.x(), 
               std_target_point.y(), 
               std_target_point.z());
      // Note that target point, camera position, 
      // and bounding box have already been sent above.
      // The std_target_point is necessary to
      // Calc focal distance from the zoom factor.
  } else {
    const G4double FR_HALF_SCREEN_SIZE = 0.5 ;
    G4double  focal_distance \
      = FR_HALF_SCREEN_SIZE / std::tan( half_view_angle ); 
    focal_distance *= zoom_factor ;
    fSceneHandler.SendStrDouble ( FR_FOCAL_DISTANCE, focal_distance );
  }

    //----- INVOKE GUI: not executed in the default setting
  if( fSceneHandler.GetSystem().IsGUIMode() ) {
      //----- send GUI command
    fSceneHandler.SendStr( FR_GUI );

      //----- wait the same command is sent back:
      //..... This avoids to send many data before
      //..... GUI session is over.
    fSceneHandler.GetPrimDest().WaitSendBack( FR_GUI );
  }

} 

#endif // G4VIS_BUILD_DAWN_DRIVER