/*!
 * \file LowPassFilter.h
 * \brief Class defining a first order low pass filter
 * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
 * \date 2011/05/01
 * \version 4.0
 */

#ifndef LOWPASSFILTER_FILTER_H
#define LOWPASSFILTER_FILTER_H

#include <IODevice.h>

namespace flair
{
    namespace core
    {
        class cvmatrix;
    }
    namespace gui
    {
        class Layout;
        class LayoutPosition;
    }
}

class LowPassFilter_impl;

namespace flair
{
namespace filter
{
    /*! \class LowPassFilter
    *
    * \brief Class defining a first order low pass filter
    */
    class LowPassFilter : public core::IODevice
    {
        public:
            /*!
            * \brief Constructor
            *
            * Construct a LowPassFilter at position. \n
            * After calling this function, position will be deleted as it is no longer usefull. \n
            * The filter is automatically updated when parent's
            * IODevice::ProcessUpdate is called. \n
            * The optional init_value parameters allow to specify
            * the size of the input datas and its inital values.
            * If unspecified, a 1*1 size is used, and values are
            * initialized with 0.
            *
            * \param parent parent
            * \param position position to display settings
            * \param name name
            * \param init_value initial value
            */
            LowPassFilter(const core::IODevice* parent,const gui::LayoutPosition* position,std::string name,const core::cvmatrix* init_value=NULL);

            /*!
            * \brief Destructor
            *
            */
            ~LowPassFilter();

            /*!
            * \brief Output value
            *
            * \param row row element
            * \param col column element
            *
            * \return element value
            */
            float Output(int row, int col) const;

            /*!
            * \brief Output matrix
            *
            * \return filtered output
            */
            core::cvmatrix* Matrix(void) const;

        private:
            /*!
            * \brief Update using provided datas
            *
            * Reimplemented from IODevice.
            *
            * \param data data from the parent to process
            */
            void UpdateFrom(const core::io_data *data);

            class LowPassFilter_impl* pimpl_;
    };
} // end namespace filter
} // end namespace flair
#endif // LOWPASSFILTER_FILTER_H