// Filename: physicsObject.cxx
// Created by:  charles (13Jun00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "physicsObject.h"

TypeHandle PhysicsObject::_type_handle;

////////////////////////////////////////////////////////////////////
//     Function : PhysicsObject
//       Access : Public
//  Description : Default Constructor
////////////////////////////////////////////////////////////////////
PhysicsObject::
PhysicsObject(void) :
  _terminal_velocity(_default_terminal_velocity),
  _mass(1.0f),
  _process_me(false),
  _oriented(true)
{
  _position.set(0.0f, 0.0f, 0.0f);
  _last_position = _position;
  _velocity.set(0.0f, 0.0f, 0.0f);
  _orientation.set(1.0 ,0.0f, 0.0f, 0.0f);
  _rotation.set(0.0f, 0.0f, 0.0f);
}

////////////////////////////////////////////////////////////////////
//     Function : PhysicsObject
//       Access : Public
//  Description : copy constructor
////////////////////////////////////////////////////////////////////
PhysicsObject::
PhysicsObject(const PhysicsObject& copy) {
  operator=(copy);
}

////////////////////////////////////////////////////////////////////
//     Function : ~PhysicsObject
//       Access : Public
//  Description : Destructor
////////////////////////////////////////////////////////////////////
PhysicsObject::
~PhysicsObject(void) {
}

////////////////////////////////////////////////////////////////////
//     Function : Assignment operator
//       Access : Public
//  Description :
////////////////////////////////////////////////////////////////////
const PhysicsObject &PhysicsObject::
operator =(const PhysicsObject &other) {
  _process_me = other._process_me;
  _mass = other._mass;
  _position = other._position;
  _last_position = other._last_position;
  _velocity = other._velocity;
  _orientation = other._orientation;
  _rotation = other._rotation;
  _terminal_velocity = other._terminal_velocity;
  _oriented = other._oriented;

  return *this;
}

////////////////////////////////////////////////////////////////////
//     Function : make_copy
//       Access : Public, virtual
//  Description : dynamic copy.
////////////////////////////////////////////////////////////////////
PhysicsObject *PhysicsObject::
make_copy(void) const {
  return new PhysicsObject(*this);
}

////////////////////////////////////////////////////////////////////
//     Function : get_lcs
//       Access : Public
//  Description : returns a transform matrix to this object's
//                local coordinate system.
////////////////////////////////////////////////////////////////////
LMatrix4f PhysicsObject::
get_lcs(void) const {
  LMatrix4f m = LMatrix4f::translate_mat(_position);

  if (_oriented == true)
    _orientation.extract_to_matrix(m);

  return m;
}

////////////////////////////////////////////////////////////////////
//     Function : get_inertial_tensor
//       Access : Public
//  Description : returns a transform matrix that represents the
//                object's willingness to be forced.
////////////////////////////////////////////////////////////////////
LMatrix4f PhysicsObject::
get_inertial_tensor(void) const {
  return LMatrix4f::ident_mat();
}