// Filename: linearForce.cxx
// Created by:  charles (14Jun00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, 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://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#include "datagram.h"
#include "datagramIterator.h"
#include "bamReader.h"
#include "bamWriter.h"

#include "linearForce.h"

TypeHandle LinearForce::_type_handle;

////////////////////////////////////////////////////////////////////
//     Function : LinearForce
//       Access : Protected
//  Description : Default/component-based constructor
////////////////////////////////////////////////////////////////////
LinearForce::
LinearForce(float a, bool mass) :
  BaseForce(true),
  _amplitude(a), _mass_dependent(mass),
  _x_mask(true), _y_mask(true), _z_mask(true) {
}

////////////////////////////////////////////////////////////////////
//     Function : LinearForce
//       Access : Protected
//  Description : copy constructor
////////////////////////////////////////////////////////////////////
LinearForce::
LinearForce(const LinearForce& copy) :
  BaseForce(copy) {
  _amplitude = copy._amplitude;
  _mass_dependent = copy._mass_dependent;
  _x_mask = copy._x_mask;
  _y_mask = copy._y_mask;
  _z_mask = copy._z_mask;
}

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

////////////////////////////////////////////////////////////////////
//    Function : get_vector
//      Access : Public
////////////////////////////////////////////////////////////////////
LVector3f LinearForce::
get_vector(const PhysicsObject *po) {
  LVector3f child_vector = get_child_vector(po) * _amplitude;

  if (_x_mask == false)
    child_vector[0] = 0.0f;

  if (_y_mask == false)
    child_vector[1] = 0.0f;

  if (_z_mask == false)
    child_vector[2] = 0.0f;

  return child_vector;
}

////////////////////////////////////////////////////////////////////
//    Function : is_linear
//      Access : Public
////////////////////////////////////////////////////////////////////
bool LinearForce::
is_linear() const {
  return true;
}

////////////////////////////////////////////////////////////////////
//     Function : output
//       Access : Public
//  Description : Write a string representation of this instance to
//                <out>.
////////////////////////////////////////////////////////////////////
void LinearForce::
output(ostream &out) const {
  #ifndef NDEBUG //[
  out<<"LinearForce (id "<<this<<")";
  #endif //] NDEBUG
}

////////////////////////////////////////////////////////////////////
//     Function : write
//       Access : Public
//  Description : Write a string representation of this instance to
//                <out>.
////////////////////////////////////////////////////////////////////
void LinearForce::
write(ostream &out, unsigned int indent) const {
  #ifndef NDEBUG //[
  out.width(indent); out<<""; out<<"LinearForce (id "<<this<<")\n";
  out.width(indent+2); out<<""; out<<"_amplitude "<<_amplitude<<"\n";
  out.width(indent+2); out<<""; out<<"_mass_dependent "<<_mass_dependent<<"\n";
  out.width(indent+2); out<<""; out<<"_x_mask "<<_x_mask<<"\n";
  out.width(indent+2); out<<""; out<<"_y_mask "<<_y_mask<<"\n";
  out.width(indent+2); out<<""; out<<"_z_mask "<<_z_mask<<"\n";
  BaseForce::write(out, indent+2);
  #endif //] NDEBUG
}
