G4XXXSGSceneHandler.cc

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// John Allison  10th March 2006
// A template for a sophisticated graphics driver with a scene graph.
//?? Lines beginning like this require specialisation for your driver.
 
#include "G4XXXSGSceneHandler.hh"
 
#include "G4XXXSGViewer.hh"
#include "G4PhysicalVolumeModel.hh"
#include "G4LogicalVolumeModel.hh"
#include "G4VPhysicalVolume.hh"
#include "G4LogicalVolume.hh"
#include "G4Box.hh"
#include "G4Polyline.hh"
#include "G4Text.hh"
#include "G4Circle.hh"
#include "G4Square.hh"
#include "G4Polyhedron.hh"
#include "G4UnitsTable.hh"
 
#include <sstream>
 
G4int G4XXXSGSceneHandler::fSceneIdCount = 0;
// Counter for XXX scene handlers.
 
G4XXXSGSceneHandler::G4XXXSGSceneHandler(G4VGraphicsSystem& system,
                         const G4String& name):
  G4VSceneHandler(system, fSceneIdCount++, name)
{}
 
G4XXXSGSceneHandler::~G4XXXSGSceneHandler() {}
 
#ifdef G4XXXSGDEBUG
// Useful function...
void G4XXXSGSceneHandler::PrintThings() {
  G4cout <<
    "  with transformation "
         << (void*)fpObjectTransformation;
  if (fpModel) {
    G4cout << " from " << fpModel->GetCurrentDescription()
       << " (tag " << fpModel->GetCurrentTag()
       << ')';
  } else {
    G4cout << "(not from a model)";
  }
  G4PhysicalVolumeModel* pPVModel =
    dynamic_cast<G4PhysicalVolumeModel*>(fpModel);
  if (pPVModel) {
    G4cout <<
      "\n  current physical volume: "
           << pPVModel->GetCurrentPV()->GetName() <<
      "\n  current logical volume: "
// There might be a problem with the LV pointer if this is a G4LogicalVolumeModel
           << pPVModel->GetCurrentLV()->GetName() <<
      "\n  current depth of geometry tree: "
           << pPVModel->GetCurrentDepth();
  }
  G4cout << G4endl;
}
#endif
 
void G4XXXSGSceneHandler::CreateCurrentItem(const G4String& /*header*/) {
  // Utility for PreAddSolid and BeginPrimitives.
  
  G4PhysicalVolumeModel* pPVModel =
    dynamic_cast<G4PhysicalVolumeModel*>(fpModel);
  G4LogicalVolumeModel* pLVModel =
    dynamic_cast<G4LogicalVolumeModel*>(pPVModel);
  if (pPVModel && !pLVModel) {
 
    // This call comes from a G4PhysicalVolumeModel.  drawnPVPath is
    // the path of the current drawn (non-culled) volume in terms of
    // drawn (non-culled) ancestors.  Each node is identified by a
    // PVNodeID object, which is a physical volume and copy number.  It
    // is a vector of PVNodeIDs corresponding to the geometry hierarchy
    // actually selected, i.e., not culled.
    typedef G4PhysicalVolumeModel::G4PhysicalVolumeNodeID PVNodeID;
    typedef std::vector<PVNodeID> PVPath;
    const PVPath& drawnPVPath = pPVModel->GetDrawnPVPath();
    //G4int currentDepth = pPVModel->GetCurrentDepth();
    //G4VPhysicalVolume* pCurrentPV = pPVModel->GetCurrentPV();
    //G4LogicalVolume* pCurrentLV = pPVModel->GetCurrentLV();
    //G4Material* pCurrentMaterial = pPVModel->GetCurrentMaterial();
    // Note: pCurrentMaterial may be zero (parallel world).
 
    // The simplest algorithm, used by the Open Inventor Driver
    // developers, is to rely on the fact the G4PhysicalVolumeModel
    // traverses the geometry hierarchy in an orderly manner.  The last
    // mother, if any, will be the node to which the volume should be
    // added.  So it is enough to keep a map of scene graph nodes keyed
    // on the volume path ID.  Actually, it is enough to use the logical
    // volume as the key.  (An alternative would be to keep the PVNodeID
    // in the tree and match the PVPath from the root down.)
 
    // BUT IN OPENGL, IF THERE ARE TRANSPARENT OBJECTS, VOLUMES DO NOT
    // ARRIVE IN THE ABOVE ORDER.  (TRANSPARENT OBJECTS ARE DRWAN
    // LAST.)  SO WE MUST BE MORE SOPHISTICATED IN CONSTRUCTING A
    // TREE.
 
    /* Debug
    G4cout << drawnPVPath << G4endl;
    */
 
    static G4int index = 0;  // Some index for future reference
    JA::Insert(&drawnPVPath[0],drawnPVPath.size(),index++,&fSceneGraph);
    //JA::PrintTree(std::cout,&root);
 
    /***  Old algorithm, left here for historical interest!!
    // Find mother.  ri points to drawn mother, if any.
    PVPath::const_reverse_iterator ri = ++drawnPVPath.rbegin();
    if (ri != drawnPVPath.rend()) {
      // This volume has a mother.
      G4LogicalVolume* drawnMotherLV =
    ri->GetPhysicalVolume()->GetLogicalVolume();
      LVMapIterator mother = fLVMap.find(drawnMotherLV);
      if (mother != fLVMap.end()) {
    // This adds a child in Troy's tree...
    fCurrentItem = mother->second.push_back(header);
      } else {
    // Mother not previously encountered.  Shouldn't happen, since
    // G4PhysicalVolumeModel sends volumes as it encounters them,
    // i.e., mothers before daughters, in its descent of the
    // geometry tree.  Error!
    G4cout << "ERROR: G4XXXSGSceneHandler::PreAddSolid: Mother "
           << ri->GetPhysicalVolume()->GetName()
           << ':' << ri->GetCopyNo()
           << " not previously encountered."
      "\nShouldn't happen!  Please report to visualization coordinator."
           << G4endl;
    // Continue anyway.  Add to root of scene graph tree...
    fCurrentItem = fPermanentsRoot.push_back(header);
      }
    } else {
      // This volume has no mother.  Must be a top level un-culled
      // volume.  Add to root of scene graph tree...
      fCurrentItem = fPermanentsRoot.push_back(header);
    }
 
    std::ostringstream oss;
    oss << "Path of drawn PVs: ";
    for (PVPath::const_iterator i = drawnPVPath.begin();
     i != drawnPVPath.end(); ++i) {
      oss << '/' << i->GetPhysicalVolume()->GetName()
      << ':' << i->GetCopyNo();
    }
    oss << std::endl;
    *fCurrentItem += oss.str();
 
    // Store for future searches.  Overwrites previous entries for this
    // LV, so entry is always the *last* LV.
    fLVMap[pCurrentLV] = fCurrentItem;
    ***/
 
  } else {  // Not from a G4PhysicalVolumeModel.
 
    /***
    // Create a place for current solid in root...
    if (fReadyForTransients) {
      fCurrentItem = fTransientsRoot.push_back(header);
    } else {
      fCurrentItem = fPermanentsRoot.push_back(header);
    }
    ***/
  }
}
 
void G4XXXSGSceneHandler::PreAddSolid
(const G4Transform3D& objectTransformation,
 const G4VisAttributes& visAttribs)
{  
  G4VSceneHandler::PreAddSolid(objectTransformation, visAttribs);
  CreateCurrentItem(G4String("\nPreAddSolid:\n"));
}
 
void G4XXXSGSceneHandler::PostAddSolid()
{
  G4VSceneHandler::PostAddSolid();
}
 
void G4XXXSGSceneHandler::BeginPrimitives
(const G4Transform3D& objectTransformation)
{
  G4VSceneHandler::BeginPrimitives(objectTransformation);
}
 
void G4XXXSGSceneHandler::EndPrimitives ()
{
  G4VSceneHandler::EndPrimitives ();
}
 
// Note: This function overrides G4VSceneHandler::AddSolid(const
// G4Box&).  You may not want to do this, but this is how it's done if
// you do.  Certain other specific solids may be treated this way -
// see G4VSceneHandler.hh.  The simplest possible driver would *not*
// implement these polymorphic functions, with the effect that the
// default versions in G4VSceneHandler are used, which simply call
// G4VSceneHandler::RequestPrimitives to turn the solid into a
// G4Polyhedron usually.
// Don't forget, solids can be transients too (e.g., representing a hit).
void G4XXXSGSceneHandler::AddSolid(const G4Box& box) {
#ifdef G4XXXSGDEBUG
  G4cout <<
    "G4XXXSGSceneHandler::AddSolid(const G4Box& box) called for "
     << box.GetName()
     << G4endl;
#endif
  //?? Process your box...
  std::ostringstream oss;
  oss << "G4Box(" <<
    G4String
    (G4BestUnit
     (G4ThreeVector
      (box.GetXHalfLength(), box.GetYHalfLength(), box.GetZHalfLength()),
      "Length")).strip() << ')' << std::endl;
  //*fCurrentItem += oss.str();
}
 
void G4XXXSGSceneHandler::AddPrimitive(const G4Polyline& polyline) {
#ifdef G4XXXSGDEBUG
  G4cout <<
    "G4XXXSGSceneHandler::AddPrimitive(const G4Polyline& polyline) called.\n"
     << polyline
     << G4endl;
#endif
  // Get vis attributes - pick up defaults if none.
  //const G4VisAttributes* pVA =
  //  fpViewer -> GetApplicableVisAttributes (polyline.GetVisAttributes ());
  //?? Process polyline.
  std::ostringstream oss;
  oss << polyline << std::endl;
  //*fCurrentItem += oss.str();
}
 
void G4XXXSGSceneHandler::AddPrimitive(const G4Text& text) {
#ifdef G4XXXSGDEBUG
  G4cout <<
    "G4XXXSGSceneHandler::AddPrimitive(const G4Text& text) called.\n"
     << text
     << G4endl;
#endif
  // Get text colour - special method since default text colour is
  // determined by the default text vis attributes, which may be
  // specified independent of default vis attributes of other types of
  // visible objects.
  //const G4Colour& c = GetTextColour (text);  // Picks up default if none.
  //?? Process text.
  std::ostringstream oss;
  oss << text << std::endl;
  //*fCurrentItem += oss.str();
}
 
void G4XXXSGSceneHandler::AddPrimitive(const G4Circle& circle) {
#ifdef G4XXXSGDEBUG
  G4cout <<
    "G4XXXSGSceneHandler::AddPrimitive(const G4Circle& circle) called.\n"
     << circle
     << G4endl; 
  MarkerSizeType sizeType;
  G4double size = GetMarkerSize (circle, sizeType);
  switch (sizeType) {
  default:
  case screen:
    // Draw in screen coordinates.
    G4cout << "screen";
    break;
  case world:
    // Draw in world coordinates.
    G4cout << "world";
    break;
  }
  G4cout << " size: " << size << G4endl;
#endif
  // Get vis attributes - pick up defaults if none.
  //const G4VisAttributes* pVA =
  //  fpViewer -> GetApplicableVisAttributes (circle.GetVisAttributes ());
  //?? Process circle.
  std::ostringstream oss;
  oss << circle << std::endl;
  //*fCurrentItem += oss.str();
}
 
void G4XXXSGSceneHandler::AddPrimitive(const G4Square& square) {
#ifdef G4XXXSGDEBUG
  G4cout <<
    "G4XXXSGSceneHandler::AddPrimitive(const G4Square& square) called.\n"
     << square
     << G4endl;
  MarkerSizeType sizeType;
  G4double size = GetMarkerSize (square, sizeType);
  switch (sizeType) {
  default:
  case screen:
    // Draw in screen coordinates.
    G4cout << "screen";
    break;
  case world:
    // Draw in world coordinates.
    G4cout << "world";
    break;
  }
  G4cout << " size: " << size << G4endl;
#endif
  // Get vis attributes - pick up defaults if none.
  //const G4VisAttributes* pVA =
  //  fpViewer -> GetApplicableVisAttributes (square.GetVisAttributes ());
  //?? Process square.
  std::ostringstream oss;
  oss << square << std::endl;
  //*fCurrentItem += oss.str();
}
 
void G4XXXSGSceneHandler::AddPrimitive(const G4Polyhedron& polyhedron) {
#ifdef G4XXXSGDEBUG
  G4cout <<
 "G4XXXSGSceneHandler::AddPrimitive(const G4Polyhedron& polyhedron) called.\n"
     << polyhedron
     << G4endl;
#endif
  //?? Process polyhedron.
  std::ostringstream oss;
  oss << polyhedron;
  //*fCurrentItem += oss.str();
 
  //?? Or... here are some ideas for decomposing into polygons...
  //Assume all facets are convex quadrilaterals.
  //Draw each G4Facet individually
  
  //Get colour, etc..
  if (polyhedron.GetNoFacets() == 0) return;
 
  // Get vis attributes - pick up defaults if none.
  const G4VisAttributes* pVA =
    fpViewer -> GetApplicableVisAttributes (polyhedron.GetVisAttributes ());
 
  // Get view parameters that the user can force through the vis
  // attributes, thereby over-riding the current view parameter.
  G4ViewParameters::DrawingStyle drawing_style = GetDrawingStyle (pVA);
  //G4bool isAuxEdgeVisible = GetAuxEdgeVisible (pVA);
  
  //Get colour, etc..
  //const G4Colour& c = pVA -> GetColour ();
  
  // Initial action depending on drawing style.
  switch (drawing_style) {
  case (G4ViewParameters::hsr):
    {
      break;
    }
  case (G4ViewParameters::hlr):
    {
      break;
    }
  case (G4ViewParameters::wireframe):
    {
      break;
    }
  default:
    {
      break;
    }     
  }
 
  // Loop through all the facets...
 
  // Look at G4OpenGLSceneHandler::AddPrimitive(const G4Polyhedron&)
  // for an example of how to get facets out of a G4Polyhedron,
  // including how to cope with triangles if that's a problem.
}
 
void G4XXXSGSceneHandler::ClearStore ()
{
  JA::Clear(&fSceneGraph);
}
 
void G4XXXSGSceneHandler::ClearTransientStore ()
{
  JA::Clear(&fSceneGraph);
}
 
namespace JA {
// Ad hoc tree class and utilities.
 
#include "G4VPhysicalVolume.hh"
 
void Insert(const PVNodeID* pvPath, size_t pathLength,
        G4int index, Node* node) {
  // Path passed as a PVNodeID* to avoid copying.
 
  /* Debug
  for (size_t i = 0; i < pathLength; ++i) {
    std::cout << pvPath[i].GetPhysicalVolume()->GetName() << ":"
              << pvPath[i].GetCopyNo() << " ("
              << index << "), ";
  }
  */
 
  // See if node has been encountered before
  G4bool found = false; size_t foundPosition = 0;
  for (size_t i = 0; i < node->fDaughters.size(); ++i) {
    PVNodeID& daughterPVNodeID = node->fDaughters[i]->fPVNodeID;
    // It is enough to compare volume and copy number at a given position in the tree
    if (daughterPVNodeID.GetPhysicalVolume() == pvPath[0].GetPhysicalVolume() &&
    daughterPVNodeID.GetCopyNo() == pvPath[0].GetCopyNo()) {
      found = true;
      foundPosition = i;
      break;
    }
  }
 
  if (pathLength == 1) {  // This is a leaf
    if (found) {  // Update index
      node->fDaughters[foundPosition]->fIndex = index;
    } else {      // Make a new full entry
      node->fDaughters.push_back(new Node(pvPath[0],index));
    }
    /* Debug
    std::cout << std::endl;
    */
  } else {  // Not a leaf - carry on with rest of path
    if (found) {  // Just carry on
      Insert(pvPath+1,--pathLength,index,
         node->fDaughters[foundPosition]);
    } else {      // Insert place holder, then carry on
      node->fDaughters.push_back(new Node(pvPath[0]));
      Insert(pvPath+1,--pathLength,index,
         node->fDaughters[node->fDaughters.size()-1]);
    }
  }
}
 
void PrintTree(std::ostream& os, Node* node)
{
  static G4int depth = -1;
  depth++;
  PVNodeID& thisPVNodeID = node->fPVNodeID;
  G4int& thisIndex = node->fIndex;
  const size_t& nDaughters = node->fDaughters.size();
  G4VPhysicalVolume* thisPhysicalVolume= thisPVNodeID.GetPhysicalVolume();
  if (!thisPhysicalVolume) os << "Root" << std::endl;
  else {
    for (G4int i = 0; i < depth; ++i) os << "__";
    os << thisPVNodeID.GetPhysicalVolume()->GetName() << ":"
       << thisPVNodeID.GetCopyNo() << " ("
       << thisIndex << ")" << std::endl;;
  }
  for (size_t i = 0; i < nDaughters; ++i) {
    PrintTree(os, node->fDaughters[i]);
  }
  depth--;
}
 
void Clear(Node* node)
{
  const size_t& nDaughters = node->fDaughters.size();
  for (size_t i = 0; i < nDaughters; ++i) {
    Clear(node->fDaughters[i]);
    delete node->fDaughters[i];
  }
}
 
} // End namespace JA