/***************************************************************************
   File:        PBMSimScene.cpp                                                            
   Created:     02/04/2002                                                            
   Author:      Maxim Garber                                                
                Computer Science Department                                 
                University of North Carolina - Chapel Hill                  
                garber@cs.unc.edu                                           
                                                                            
   Description: Simulation scene file.                                                            
                                                                            
----------------------------------------------------------------------------.
   Copyright 2001 Maxim Garber                                              
   UNC Motion Planning Research Group                                       
                                                                            
                                                                            
*****************************************************************************/
#include "PBMSimScene.h"
#include <algorithm>



/****************************************************************************
   Function   : PBMSimScene                                          
   Description: Constructor                                                            
****************************************************************************/
PBMSimScene::PBMSimScene(){}

/****************************************************************************
   Function   : ~PBMSimScene                                         
   Description: Destructor                                                            
****************************************************************************/
PBMSimScene::~PBMSimScene()
{
  
  std::list<PBMSimObject*>::iterator i = _objects.begin();
  for(; i!= _objects.end(); i++)
      delete(*i);
  _objects.clear();
}

/****************************************************************************
   Function   : Update                                            
   Description: Updates the objects in the scene and cull inactive obejcts                                                          
****************************************************************************/
void PBMSimScene::Update(float timeStep)
{

  // update all objects
  std::list<PBMSimObject*>::iterator j = _objects.begin();
  for(; j!= _objects.end(); j++)
      (*j)->Update(timeStep);

  // cull inactive objects
  std::list<PBMSimObject*>::iterator newEnd = std::stable_partition(_objects.begin(), _objects.end(), PBMSimObjectActive);
  for(j = newEnd; j != _objects.end(); j++)
  {
    PBMSimObject *obj = *j;
    delete obj;
  }
  if (newEnd != _objects.end())
    _objects.erase(newEnd, _objects.end());
}


/****************************************************************************
   Function   : Draw                                              
   Description: Draws all of the objects in the scene                                                            
****************************************************************************/
void PBMSimScene::Draw()
{
  // draw all objects
  std::list<PBMSimObject*>::iterator i = _objects.begin();
  for(; i!= _objects.end(); i++)
      (*i)->Draw();
}