pursue.cxx

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/**
 * 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 pursue.cxx
 * @author Deepak, John, Navin
 * @date 2009-10-24
 */

#include "pursue.h"

Pursue::
Pursue(AICharacter *ai_ch, NodePath target_object, float pursue_wt) {
  _ai_char = ai_ch;

  _pursue_target = target_object;
  _pursue_weight = pursue_wt;

  _pursue_done = false;
}

Pursue::
~Pursue() {
}

/**
 * This function performs the pursue and returns a pursue force which is used
 * in the calculate_prioritized function.  In case the target has been reached
 * it resets the forces to 0 so that the character stops.  This function is
 * not to be used by the user.
 */
LVecBase3 Pursue::
do_pursue() {
  assert(_pursue_target && "pursue target not assigned");

  LVecBase3 present_pos = _ai_char->_ai_char_np.get_pos(_ai_char->_window_render);
  double target_distance = (_pursue_target.get_pos(_ai_char->_window_render) - present_pos).length();

  if(int(target_distance) == 0) {
    _pursue_done = true;
    _ai_char->_steering->_steering_force = LVecBase3(0.0, 0.0, 0.0);
    _ai_char->_steering->_pursue_force = LVecBase3(0.0, 0.0, 0.0);
    return LVecBase3(0.0, 0.0, 0.0);
  }
  else {
    _pursue_done = false;
  }

  _pursue_direction = _pursue_target.get_pos(_ai_char->_window_render) - present_pos;
  _pursue_direction.normalize();

  LVecBase3 desired_force = _pursue_direction * _ai_char->_movt_force;
  return desired_force;
}