ArActionJoydrive.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 "ArActionJoydrive.h"
#include "ArRobot.h"
#include "ariaInternal.h"

ArActionJoydrive::ArActionJoydrive(const char *name, 
                                            double transVelMax, 
                                            double turnAmountMax,
                                            bool stopIfNoButtonPressed,
                                            bool useOSCalForJoystick) :
  ArAction(name, "This action reads the joystick and sets the translational and rotational velocities based on this.")
{
  if ((myJoyHandler = Aria::getJoyHandler()) == NULL)
  {
    myJoyHandler = new ArJoyHandler;
    myJoyHandler->init();
    Aria::setJoyHandler(myJoyHandler);
  }

  setSpeeds(transVelMax, turnAmountMax);

  setNextArgument(ArArg("trans vel max", &myTransVelMax, "The full speed to go when the joystick is maxed forwards/backwards (mm/sec)"));
  
  setNextArgument(ArArg("turn amount max", &myTurnAmountMax, "The full amount to turn if the joystick is pushed all the way right/left (deg)"));

  setNextArgument(ArArg("stop if no button pressed", &myStopIfNoButtonPressed, "If this is true, then joydrive will stop the robot if there is no button pressed, otherwise it will just let whatever lower priority things go."));
  myStopIfNoButtonPressed = stopIfNoButtonPressed;

  setNextArgument(ArArg("use os calibration for joystick", &myUseOSCal, "If this is true then the os calibration for the joystick will be used, otherwise autocalibration will be used."));
  myUseOSCal = useOSCalForJoystick;
  myPreviousUseOSCal = myUseOSCal;

  myUseThrottle = false;
}

ArActionJoydrive::~ArActionJoydrive()
{

}

void ArActionJoydrive::setStopIfNoButtonPressed(
        bool stopIfNoButtonPressed)
{
  myStopIfNoButtonPressed = stopIfNoButtonPressed;
}

bool ArActionJoydrive::getStopIfNoButtonPressed(void)
{
  return myStopIfNoButtonPressed;
}

bool ArActionJoydrive::joystickInited(void)
{
  return myJoyHandler->haveJoystick();
}

void ArActionJoydrive::setUseOSCal(bool useOSCal)
{
  myUseOSCal = useOSCal;
  myPreviousUseOSCal = useOSCal;
  myJoyHandler->setUseOSCal(useOSCal);
}

bool ArActionJoydrive::getUseOSCal(void)
{
  return myUseOSCal;
}

void ArActionJoydrive::setSpeeds(double transVelMax, 
                                          double turnAmountMax)
{
  myTransVelMax = transVelMax;
  myTurnAmountMax = turnAmountMax;
}

void ArActionJoydrive::setThrottleParams(double lowSpeed, double highSpeed)
{
  myUseThrottle = true;
  myLowThrottle = lowSpeed;
  myHighThrottle = highSpeed;
}

ArActionDesired *ArActionJoydrive::fire(ArActionDesired currentDesired)
{
  double rot, trans, throttle;

  myDesired.reset();
  if (myPreviousUseOSCal != myUseOSCal)
  {
    myJoyHandler->setUseOSCal(myUseOSCal);
    myPreviousUseOSCal = myUseOSCal;
  }

  if (myJoyHandler->haveJoystick() && myJoyHandler->getButton(1))
  {
    // get the readings from the joystick
    myJoyHandler->getDoubles(&rot, &trans);
    rot *= myTurnAmountMax;
    // if we're not using the throttle just mult simply, or if we
    // don't know if we have a throttle
    if (!myUseThrottle || !myJoyHandler->haveZAxis()) 
    {
      trans *= myTransVelMax;
    }
    // if we are using the throttle, interpolate its position between
    // low and high throttle values
    else
    {
      throttle = myJoyHandler->getAxis(3);
      throttle += 1.0;
      throttle /= 2.0;
      trans = trans * (myLowThrottle + 
                       (throttle * (myHighThrottle - myLowThrottle)));
    }
    // set what we want to do
    myDesired.setVel(trans);
    myDesired.setDeltaHeading(-rot);
    // return the actionDesired
    return &myDesired;
  }
  else if (myJoyHandler->haveJoystick() && myStopIfNoButtonPressed)
  {
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  
  return NULL;
}

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