/*!
 * \file ButterworthLowPass.h
 * \brief Class defining a Butterworth low pass filter
 * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
 * \date 2013/12/10
 * \version 4.0
 */

#ifndef BUTTERWORTHLOWPASS_H
#define BUTTERWORTHLOWPASS_H

#include <IODevice.h>

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

class ButterworthLowPass_impl;

namespace flair
{
namespace filter
{
    /*! \class ButterworthLowPass
    *
    * \brief Class defining a Butterworth low pass filter
    */
    class ButterworthLowPass : public core::IODevice
    {
        public:
            /*!
            * \brief Constructor
            *
            * Construct a ButterworthLowPass 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.
            *
            * \param parent parent
            * \param position position to display settings
            * \param name name
            * \param order order of the filter
            */
            ButterworthLowPass(const IODevice* parent,const gui::LayoutPosition* position,std::string name,int order);

            /*!
            * \brief Constructor
            *
            * Construct a ButterworthLowPass at position. \n
            * The ButterworthLowPass will automatically be child of position->getLayout() Layout. After calling this function,
            * position will be deleted as it is no longer usefull. \n
            * The filter is updated manually with UpdateFrom method. \n
            *
            * \param position position to display settings
            * \param name name
            * \param order order of the filter
            */
            ButterworthLowPass(const gui::LayoutPosition* position,std::string name,int order);

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

            /*!
            * \brief Output value
            *
            * \return filtered output
            */
            float Output(void) const;

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

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

        private:

            class ButterworthLowPass_impl* pimpl_;
    };
} // end namespace filter
} // end namespace flair
#endif // BUTTERWORTHLOWPASS_H