vis_macros.cc

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#include <list>
#include <cmath>

#include <TEveElement.h>
#include <TEveGeoNode.h>
#include <TGeoNode.h>

#include "vis_macros.h"

// get the named from an object derived from both TEveElement and TNamed
const char* get_name( const TEveElement * element ) {
   // try as a TEveGeoNode or TEveGeoShape
   if (const TEveGeoNode * node = dynamic_cast<const TEveGeoNode *>( element ))
      return node->GetName();
   if (const TEveGeoShape * shape = dynamic_cast<const TEveGeoShape *>( element ))
      return shape->GetName();

   // try to access the element as a named thingy
   if (const TNamed * named = dynamic_cast<const TNamed *>( element ))
      return named->GetName();

   return 0;
}

// force a node to expand its internal reprsentation, so all children are actually present
void expand_node( TEveElement * element )
{
   // force a TEveGeoNode to load all its children
   if (TEveGeoNode * node = dynamic_cast<TEveGeoNode *>( element )) {
      if (node->NumChildren() == 0 && node->GetNode()->GetVolume()->GetNdaughters() > 0) {
         TIter next(node->GetNode()->GetVolume()->GetNodes());
         TGeoNode* dnode;
         while ((dnode = (TGeoNode*) next()) != 0) {
            TEveGeoNode* node_re = new TEveGeoNode(dnode);
            node->AddElement(node_re);
         }
      }
      return;
   }
   // a TEveGeoShape is always exanded
   //if (TEveGeoShape * shape __attribute__ ((unused)) = dynamic_cast<TEveGeoShape *>( element )) {
   //  return;
   //}
   // a generic TEveElement has no knwledge on children expansion
   return;
}

// retrieves a TShape from a TEveElement
const TGeoShape * get_shape( const TEveElement * element ) {
   // a TEveGeoNode, can look into its TGeoNode and retrieve the shape
   if (const TEveGeoNode * node = dynamic_cast<const TEveGeoNode *>( element )) {
      return node->GetNode()->GetVolume()->GetShape();
   }
   // a TEveGeoShape owns its shape
   if (const TEveGeoShape * shape = dynamic_cast<const TEveGeoShape *>( element )) {
      TEveGeoShape * nc_shape = const_cast<TEveGeoShape *>( shape );
      return const_cast<const TGeoShape *>( nc_shape->GetShape() );
   }
   // a TEveElement is too generic, no way to get a shape
   return 0;
}

// overloaded non-const TShape retrieval, allowed from a TGeoShape only
TGeoShape * get_shape( TEveElement * element ) {
   // a TEveGeoNode cannot modify its shape
   //if (const TEveGeoNode * node __attribute__ ((unused)) = dynamic_cast<const TEveGeoNode *>( element )) {
   //  return 0;
   //}
   // a TEveGeoShape owns its shape, and can modifiy it
   if (TEveGeoShape * shape = dynamic_cast<TEveGeoShape *>( element )) {
      return shape->GetShape();
   }
   // a TEveElement is too generic, no way to get a shape
   return 0;
}
// set an element's color and alpha, and possibly its children's up to levels levels deep
void set_color( TEveElement * element, Color_t color, float alpha, unsigned int levels )
{
   if (not element)
      return;

   // set this node's color
   element->SetMainColor( color );
   if (alpha > 1.) alpha = 1.;
   if (alpha < 0.) alpha = 0.;
   unsigned char transparency = (unsigned char) roundf(100. - (alpha * 100.));
   element->SetMainTransparency( transparency );

   if (levels > 0) {
      // set the node's children's color
      expand_node( element );
      for (std::list<TEveElement*>::iterator i = element->BeginChildren(); i != element->EndChildren(); ++i)
         set_color( *i, color, alpha, levels - 1);
   }
   // notify the element that it has changed
   element->ElementChanged(true, true);
}

// check if a node has any children or if it's a leaf node
bool is_leaf_node( const TEveElement * element )
{
   // a TEveGeoNode can have unaccounted-for children
   if (const TEveGeoNode * node = dynamic_cast<const TEveGeoNode *>( element )) {
      return ((node->NumChildren() == 0) and (node->GetNode()->GetVolume()->GetNdaughters() == 0));
   }
   // a TEveGeoShape always knows its children
   if (const TEveGeoShape * shape = dynamic_cast<const TEveGeoShape *>( element )) {
      return (shape->NumChildren() == 0);
   }
   // default implementation
   return (element->NumChildren() == 0);
}

// toggle an elements's children visibility, based on their name
// names are checked only up to their length, so for example tec:TEC will match both tec:TEC_1 and tec:TEC_2
void set_children_visibility( TEveElement * element, const std::string & node_name, const std::vector<std::string> & children_name, bool visibility )
{
   // try to access the element as a named thingy
   const char * name = get_name( element );
   if (not name or strncmp(name, node_name.c_str(), node_name.size()))
      // unnamed node, or wrong node
      return;

   for (std::list<TEveElement *>::iterator j = element->BeginChildren(); j != element->EndChildren(); ++j) {
      TEveElement * child = *j;
      name = get_name( child );
      if (not name)
         // unnamed node, ignore it
         continue;

      for (unsigned int i = 0; i < children_name.size(); ++i)
         if (not strncmp(name, children_name[i].c_str(), children_name[i].size())) {
            // change this child visibility
            if (is_leaf_node( child )) {
               child->SetRnrSelf( visibility );
               child->SetRnrChildren( false );
            } else {
               child->SetRnrSelf( false );
               child->SetRnrChildren( visibility );
            }
            break;
         }
   }
   // notify the element that is had changed
   element->ElementChanged(true, true);
}

// set Tracker's Endcaps visibility
void set_tracker_endcap_visibility( TEveElement * tracker, bool visibility )
{
   std::vector<std::string> endcap;
   endcap.push_back("tec:TEC");
   endcap.push_back("tidf:TIDF");
   endcap.push_back("tidb:TIDB");
   endcap.push_back("pixfwd:PixelForwardZPlus");
   endcap.push_back("pixfwd:PixelForwardZMinus");
   set_children_visibility( tracker, "tracker:Tracker", endcap, visibility );
}

// show Tracker's Endcaps
void show_tracker_endcap( TEveElement * tracker )
{
   set_tracker_endcap_visibility( tracker, true );
}

// hide Tracker's Endcaps
void hide_tracker_endcap( TEveElement * tracker )
{
   set_tracker_endcap_visibility( tracker, false );
}