lasp/cpp_src/dsp/lasp_window.h

#pragma once
#include "lasp_mathtypes.h"

/**
 * @brief Window (aka taper) functions of a certain type
 */
class Window {

  public:
    enum class WindowType {
      Hann = 0,
      Hamming = 1,
      Rectangular = 2,    
      Bartlett = 3,
      Blackman = 4,

    };
    /**
     * @brief Convert a window type enum to its equivalent text.
     *
     * @param wt The window type to convert
     *
     * @return Text string
     */
    static std::string toText(const WindowType wt) {
      switch(wt) {
        case(WindowType::Hann): {
          return "Hann";
        }
        break;
        case(WindowType::Hamming): {
          return "Hamming";
        }
        break;
        case(WindowType::Rectangular): {
          return "Rectangular";
        }
        break;
        case(WindowType::Bartlett): {
          return "Bartlett";
        }
        break;
        case(WindowType::Blackman): {
          return "Blackman";
        }
        break;
      }
      throw std::runtime_error("Not implemenented window type");
    }

    /**
     * @brief Dispatcher: create a window based on enum type and len
     *
     * @param w Window type
     * @param len Length of the window (typically, integer power of two).
     *
     * @return Window vector of values
     */
    static vd create(const WindowType w,const us len);

    /**
     * @brief Hann window
     *
     * @param len Length of the window (typically, integer power of two).
     *
     * @return vector of values
     */
    static vd hann(const us len);

    /**
     * @brief Hamming window
     *
     * @param len Length of the window (typically, integer power of two).
     *
     * @return vector of values
     */
    static vd hamming(const us len);
    /**
     * @brief Rectangular (boxcar) window.
     *
     * @param len Length of the window (typically, integer power of two).
     *
     * @return vector of values
     */
    static vd rectangular(const us len);

    /**
     * @brief Bartlett window.
     *
     * @param len Length of the window (typically, integer power of two).
     *
     * @return vector of values
     */
    static vd bartlett(const us len);

    /**
     * @brief Blackman window.
     *
     * @param len Length of the window (typically, integer power of two).
     *
     * @return vector of values
     */
    static vd blackman(const us len);

};