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//
// $Id: G4VViewer.cc,v 1.16 2001/08/14 18:34:47 johna Exp $
// GEANT4 tag $Name: geant4-05-01 $
//
// 
// John Allison  27th March 1996
// Abstract interface class for graphics views.

#include "G4VViewer.hh"

#include "G4ios.hh"
#include "g4std/strstream"

#include "G4VisManager.hh"
#include "G4VGraphicsSystem.hh"
#include "G4VSceneHandler.hh"
#include "G4Scene.hh"
#include "G4VPhysicalVolume.hh"
#include "G4Transform3D.hh"

G4VViewer::G4VViewer (G4VSceneHandler& sceneHandler,
		      G4int id, const G4String& name):
fSceneHandler (sceneHandler),
fViewId (id),
fModified (true),
fNeedKernelVisit (true)
{
  if (name == "") {
    char charname [50];
    G4std::ostrstream ost (charname, 50);
    ost << fSceneHandler.GetName () << '-' << fViewId << G4std::ends;
    fName = charname;
  }
  else {
    fName = name;
  }
  fShortName = fName (0, fName.find (' '));
  fShortName.strip ();

  G4VisManager* pVisMan = G4VisManager::GetInstance();
  G4int xHint, yHint;
  pVisMan->GetWindowSizeHint(xHint, yHint);
  fVP.SetWindowSizeHint(xHint,yHint);
  fDefaultVP.SetWindowSizeHint(xHint,yHint);
}

G4VViewer::~G4VViewer () {}

void G4VViewer::SetName (const G4String& name) {
  fName = name;
  fShortName = fName (0, fName.find (' '));
  fShortName.strip ();
}

const G4VisAttributes* G4VViewer::GetApplicableVisAttributes
(const G4VisAttributes* pVisAttribs) const {
  // If the pointer is null, pick up the default vis attributes from
  // the view parameters.
  if (!pVisAttribs)
    pVisAttribs = GetViewParameters ().GetDefaultVisAttributes ();
  return pVisAttribs;
}

void G4VViewer::NeedKernelVisit () {

  fNeedKernelVisit = true;

  // At one time I thought we'd better notify all viewers.  But I guess
  // each viewer can take care of itself, so the following code is
  // redundant (but keep it commented out for now).   (John Allison)
  // Notify all viewers that a kernel visit is required.
  // const G4ViewerList& viewerList = fSceneHandler.GetViewerList ();
  // G4ViewerListConstIterator i;
  // for (i = viewerList.begin(); i != viewerList.end(); i++) {
  //   (*i) -> SetNeedKernelVisit ();
  // }
  // ??...but, there's a problem in OpenGL Stored which seems to
  // require *all* viewers to revisit the kernel, so...
  const G4ViewerList& viewerList = fSceneHandler.GetViewerList ();
  G4ViewerListConstIterator i;
  for (i = viewerList.begin(); i != viewerList.end(); i++) {
    (*i) -> SetNeedKernelVisit ();
  }

}

void G4VViewer::FinishView () {}

void G4VViewer::ShowView () {}

void G4VViewer::ProcessView () {

  // If view parameters have been modified, SetView works out consequences...
  if (fModified) {
    fModified = false;
    SetView ();
  }

  // If ClearStore has been requested, e.g., if the scene has changed,
  // of if the concrete viewer has decided that it necessary to visit
  // the kernel, perhaps because the view parameters have changed
  // drastically (this should be done in the concrete viewer's
  // DrawView)...
  if (fNeedKernelVisit) {
    fSceneHandler.ProcessScene (*this);
    fNeedKernelVisit = false;
  }
}

void G4VViewer::SetViewParameters (const G4ViewParameters& vp) {
  fVP = vp;
  fModified = true;
}

G4std::ostream& operator << (G4std::ostream& os, const G4VViewer& v) {
  os << "View " << v.fName << ":\n";
  os << v.fVP;
  return os;
}