[pomodoro] Make sound from generated code

[DamianSuess]

As a user, I want the Pomodoro timer to make sounds OnStart, OnComplete, and OnPause. However, I don't want to carry along heavy WAV or MP3 files; let's generate the sounds!

Reference:

• https://github.com/naudio/NAudio
  • https://www.nuget.org/packages/NAudio/
• https://stackoverflow.com/questions/203890/creating-sine-or-square-wave-in-c-sharp
• https://stackoverflow.com/questions/14042630/how-to-generate-sounds-according-to-frequency

[DamianSuess]

Did a quick test with NAudio, however, the v1.8.5 DLL from the NuGet is 450K. We don't need that much weight just to generate tones. NAudio is very nice, however, it may be overkill for this small project's needs.

I whipped up a small WinForms app with 7 signal type radio buttons in a GroupBox (hence the switch method).

    private void BtnSin_Click(object sender, EventArgs e)
    {
      var signal = new SignalGenerator()
      {
        Gain = 0.2,
        Frequency = 500,
        Type = SignalGeneratorType.Sin
      }
      .Take(TimeSpan.FromSeconds(2));

      using (var wo = new WaveOutEvent())
      {
        wo.Init(signal);
        wo.Play();

        while (wo.PlaybackState == PlaybackState.Playing)
        {
          Thread.Sleep(500);
        }
      }
    }

    private void BtnExploreTypes_Click(object sender, EventArgs e)
    {
      int duration = 2;
      SignalGeneratorType type = GetSignalType();

      if (type == SignalGeneratorType.Sweep)
        duration = 3;

      var signal = MakeSignal(type, duration);

      using (var wo = new WaveOutEvent())
      {
        wo.Init(signal);
        wo.Play();

        while (wo.PlaybackState == PlaybackState.Playing)
        {
          Thread.Sleep(500);
        }
      }
    }

    private ISampleProvider MakeSignal(SignalGeneratorType signalType, int duration)
    {
      var signal = new SignalGenerator()
      {
        Gain = 0.2,
        Frequency = 500,
        FrequencyEnd = 2000,
        SweepLengthSecs = 2,
        Type = signalType
      };
      // }.Take(TimeSpan.FromSeconds(duration));

      if (signalType == SignalGeneratorType.Sweep)
      {
        signal.FrequencyEnd = 2000;
        signal.SweepLengthSecs = 2;
      }

      var signalTake = signal.Take(TimeSpan.FromSeconds(duration));

      return signalTake;
    }

    private SignalGeneratorType GetSignalType(SignalGeneratorType def = SignalGeneratorType.Sin)
    {
      SignalGeneratorType type = SignalGeneratorType.Sin;
      RadioButton radioBtn = this.groupBox1.Controls.OfType<RadioButton>()
                                 .Where(x => x.Checked).FirstOrDefault();

      if (radioBtn != null)
      {
        switch (radioBtn.Name)
        {
          case "radioButton1":
            type = SignalGeneratorType.Triangle;
            break;

          case "radioButton2":
            type = SignalGeneratorType.Square;
            break;

          case "radioButton3":
            type = SignalGeneratorType.SawTooth;
            break;

          case "radioButton4":
            type = SignalGeneratorType.Pink;
            break;

          case "radioButton5":
            type = SignalGeneratorType.White;
            break;

          case "radioButton6":
            type = SignalGeneratorType.Sweep;
            break;

          case "radioButton7":
            type = SignalGeneratorType.Sin;
            break;

          default:
            type = def;
            break;
        }
      }
      else
      {
        type = def;
      }

      return type;
    }