/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file eggJointData.I
 * @author drose
 * @date 2001-02-23
 */

/**
 *
 */
INLINE EggJointData *EggJointData::
get_parent() const {
  return _parent;
}

/**
 *
 */
INLINE int EggJointData::
get_num_children() const {
  return _children.size();
}

/**
 *
 */
INLINE EggJointData *EggJointData::
get_child(int n) const {
  nassertr(n >= 0 && n < (int)_children.size(), nullptr);
  return _children[n];
}

/**
 * Returns the first descendent joint found with the indicated name, or NULL
 * if no joint has that name.
 */
INLINE EggJointData *EggJointData::
find_joint(const std::string &name) {
  EggJointData *joint = find_joint_exact(name);
  if (joint == nullptr) {
    joint = find_joint_matches(name);
  }
  return joint;
}


/**
 * Returns true if the joint knows its rest frame, false otherwise.  In
 * general, this will be true as long as the joint is included in at least one
 * model file, or false if it appears only in animation files.
 */
INLINE bool EggJointData::
has_rest_frame() const {
  return _has_rest_frame;
}

/**
 * Returns true if the rest frames for different models differ in their
 * initial value.  This is not technically an error, but it is unusual enough
 * to be suspicious.
 */
INLINE bool EggJointData::
rest_frames_differ() const {
  return _rest_frames_differ;
}

/**
 * Returns the rest frame of the joint.  This is the matrix value that appears
 * for the joint in each model file; it should be the same transform in each
 * model.
 */
INLINE const LMatrix4d &EggJointData::
get_rest_frame() const {
  nassertr(has_rest_frame(), LMatrix4d::ident_mat());
  return _rest_frame;
}

/**
 * Indicates an intention to change the parent of this joint to the indicated
 * joint, or NULL to remove it from the hierarchy.  The joint is not
 * reparented immediately, but rather all of the joints are reparented at once
 * when do_reparent() is called.
 */
INLINE void EggJointData::
reparent_to(EggJointData *new_parent) {
  _new_parent = new_parent;
}