#ifndef __PBMPROJECTILE_H__
#define __PBMPROJECTILE_H__
/***************************************************************************
   File:        PBMProjectile.h                                                            
   Created:     02/06/2002                                                            
   Author:      Maxim Garber                                                
                Computer Science Department                                 
                University of North Carolina - Chapel Hill                  
                garber@cs.unc.edu                                           
                                                                            
   Description: Projectile object for physically based modeling simulation.                                                            
                                                                            
----------------------------------------------------------------------------.
   Copyright 2002 Maxim Garber                                              
   UNC Collide Research Group                                      
                                                                            
                                                                            
*****************************************************************************/
#include "PBMSimObject.h"
#include "ODESolver.h"
#include "PBMProjectileLaunchParams.h"

class PBMProjectile: 
// inherits from SimObject and ODESystem base classes
public PBMSimObject, public ODESystem
{
public:
  PBMProjectile(PBMProjectileLaunchParams params);
  ~PBMProjectile(){};

  //////////////////////////////////////////////////////////////////////////////
  // Simulation 
  void Update(float timeStep);

  //////////////////////////////////////////////////////////////////////////////
  // Rendering
  void Draw();

  //////////////////////////////////////////////////////////////////////////////
  // Test For Culling
  bool IsActive(){return _position[1] > 0.0;}

  //////////////////////////////////////////////////////////////////////////////
  // ODE Integration
  void ODEDerivative(const ODEConfig& config, float time, ODEConfig& derivative);

private:
  // state
  float _position[3];
  float _velocity[3];
  float _mass;

  // forces
  float _gravity[3];          // force of gravity
  float _friction;            // air friction
  float _externalForce[3];    // external forces acting on projectile

  // ODE solver
  ODESolver* _integrator;
};
#endif //__PBMPROJECTILE_H__