ArPriorityResolver.cpp

/*
ActivMedia Robotics Interface for Applications (ARIA)
Copyright (C) 2004,2005 ActivMedia Robotics, LLC


     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

If you wish to redistribute ARIA under different terms, contact 
ActivMedia Robotics for information about a commercial version of ARIA at 
robots@activmedia.com or 
ActivMedia Robotics, 19 Columbia Drive, Amherst, NH 03031; 800-639-9481

*/

#include "ArExport.h"
#include "ariaOSDef.h"
#include "ArPriorityResolver.h"
#include "ArAction.h"
#include "ArRobot.h"

ArPriorityResolver::ArPriorityResolver() :
  ArResolver("ArPriorityResolver", "Resolves strictly by using priority, the highest priority action to act is the one that gets to go.  Does no mixing of any variety.")
{
  

}


ArPriorityResolver::~ArPriorityResolver()
{
}

ArActionDesired *ArPriorityResolver::resolve(
        ArResolver::ActionMap *actions, ArRobot *robot)
{
  ArResolver::ActionMap::reverse_iterator it;
  ArAction *action;
  ArActionDesired *act;
  ArActionDesired averaging;
  bool first = true;
  int lastPriority;
  
  if (actions == NULL)
    return NULL;

  myActionDesired.reset();
  averaging.reset();
  averaging.startAverage();
  for (it = actions->rbegin(); it != actions->rend(); ++it)
  {
    action = (*it).second;
    if (action != NULL && action->isActive())
    {
      act = action->fire(myActionDesired);
      if (robot != NULL && act != NULL)
        act->accountForRobotHeading(robot->getTh());
      if (first || (*it).first != lastPriority)
      {
        averaging.endAverage();
        myActionDesired.merge(&averaging);
        
        averaging.reset();
        averaging.startAverage();
        first = false;
        lastPriority = (*it).first;
      }
      averaging.addAverage(act);
    }
  }
  averaging.endAverage();
  myActionDesired.merge(&averaging);
  /*
  printf(
      "desired delta %.0f strength %.3f, desired speed %.0f strength %.3f\n",
      myActionDesired.getDeltaHeading(), myActionDesired.getHeadingStrength(), 
      myActionDesired.getVel(), myActionDesired.getVelStrength());
  */
  return &myActionDesired;
}

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