odometry.h

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/*
 * Author: Luca Marchionni
 * Author: Bence Magyar
 */

#ifndef ODOMETRY_H_
#define ODOMETRY_H_

#include <ros/time.h>
#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/rolling_mean.hpp>
#include <boost/function.hpp>

namespace diff_drive_controller
{
  namespace bacc = boost::accumulators;

  class Odometry
  {
  public:

    typedef boost::function<void(double, double)> IntegrationFunction;

    Odometry(size_t velocity_rolling_window_size = 10);

    bool update(double left_pos, double right_pos, const ros::Time &time);

    double getHeading() const
    {
      return heading_;
    }

    double getX() const
    {
      return x_;
    }

    double getY() const
    {
      return y_;
    }

    ros::Time getTimestamp() const
    {
      return timestamp_;
    }

    double getLinearEstimated() const;

    double getAngularEstimated() const;

    void setWheelParams(double wheel_separation, double wheel_radius);

  private:

    typedef bacc::accumulator_set<double, bacc::stats<bacc::tag::rolling_mean> > RollingMeanAcc;
    typedef bacc::tag::rolling_window RollingWindow;

    void integrateRungeKutta2(double linear, double angular);

    void integrateExact(double linear, double angular);

    ros::Time timestamp_;

    double x_;        //   [m]
    double y_;        //   [m]
    double heading_;  // [rad]

    double wheel_separation_;
    double wheel_radius_;

    double left_wheel_old_pos_;
    double right_wheel_old_pos_;

    RollingMeanAcc linear_acc_;
    RollingMeanAcc angular_acc_;

    IntegrationFunction integrate_fun_;
  };
}

#endif /* ODOMETRY_H_ */