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public:
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public:
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  /// \param display the parent display
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  /// \param display the parent display
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  /// \param x x pos
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  /// \param x x pos
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  /// \param y y pos
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  /// \param y y pos
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  /// \param siz = size
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  /// \param siz = size
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  /// \param angle Angle from straight up for lowest (-angle) and highest (angle) reading
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  displayDial_t(display_t & display,
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  displayDial_t(display_t &display,
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                uint8_t x,
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                uint8_t x,
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                uint8_t y,
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                uint8_t y,
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                uint8_t siz,
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                uint8_t siz,
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                uint16_t angle = 90);
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                uint16_t angle = 90);
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  /// @brief Construct a display with angle from Angle high to angle low
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  /// @param display
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  /// @param x
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  /// @param y
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  /// @param siz
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  /// @param angle_high Angle relative to straight up for highest reading
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  /// @param angle_low Angle relative to straight up for lowest reading
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   // put the dial needle on the display
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  displayDial_t(display_t &display,
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                uint8_t x,
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                uint8_t y,
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                uint8_t siz,
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                int16_t angle_low,
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   void draw_needle (int16_t position);
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                int16_t angle_high);
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   // draw the scale
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   /// \param low low end of range
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   /// \param high high end of range
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   /// \param width length of long marker
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  // put the dial needle on the display
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   /// \param num_step number of ticks
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  void draw_needle(int16_t position);
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   /// \param scale
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   void draw_scale (int16_t low, int16_t high, uint8_t width, uint8_t num_step,int16_t scale);
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  // draw the scale
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  /// \param low low end of range
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  /// \param high high end of range
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  /// \param width length of long marker
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   /// print min/max limits
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  /// \param num_step number of ticks
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   void draw_limits();
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  /// \param scale
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  void draw_scale(int16_t low, int16_t high, uint8_t width, uint8_t num_step, int16_t scale);
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private:
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  display_t & m_display;
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  uint8_t const m_xo ;
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  uint8_t const m_yo ;
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  uint8_t const m_siz;
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  /// print min/max limits
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  uint16_t const m_a1;
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  void draw_limits();
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  int16_t  m_low;  ///< lower scale limit
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  int16_t  m_high; ///< upper scale limit
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private:
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  display_t &m_display;
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  uint8_t const m_xo;    ///< Position of origin
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  uint8_t const m_yo;    ///< Position of origin
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  uint8_t const m_siz;   ///< Display size
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  int16_t const m_angleLow;  ///< Angle for lowest value
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  int16_t const m_angleRange; ///< Angle range from lowest to highest  value
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  int16_t m_low;         ///< lower scale limit
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  int16_t m_high;        ///< upper scale limit
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 };
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};