/*! 
    \file i_physics.h
    \brief a physics interface simulating a body with a mass
*/

#ifndef _I_PHYSICS_H
#define _I_PHYSICS_H

#include "p_node.h"

//! A Physics interface
/**
   here can be some longer description of this class
*/
class IPhysics : public PNode {

 public:
  IPhysics();
  virtual ~IPhysics();
  
  inline void setMass( float mass ) { this->mass = mass; };					//!< Set the mass of this node
  inline float getMass( void ) const { return mass; };						//!< Get the mass of this node
  inline float getTotalMass( void ) const { return mass + massChildren; };	//!< Get the sum of the masses of this node and all subnodes
  void addForce( Vector force );									//!< Add a central force on this rigid body
  void addForce( Vector force, Vector grip );						//!< Add a decentral force on this rigid body
  void tick( float dt );											//!< Update kinematics, reset force sum

 protected:
  void recalcMass();		//!< Recalculate the mass of the children
  float mass;				//!< Mass of this node
  float massChildren;		//!< Sum of the masses of the children nodes
  Vector forceSum;			//!< Total central force for this tick
  Quaternion momentumSum;	//!< Total momentum in this tick

 private:
	

};

#endif /* _I_PHYSICS_H */