Cannot implicitly convert type 'Melanchall.DryWetMidi.Interaction.ITimeSpan' to 'Melanchall.DryWetMidi.Interaction.MetricTimeSpan'

[TravisWoolston]

Hello, I'm new to DryWetMidi and I'm working on getting my note grid set up for my game. I'd like to create a script to render notes like guitar hero to start. I believe TrackNotes might be a better solution to this, if you can direct me to an example of that utilization. Any way, I'm taking a beginner approach and trying to subtract 2 seconds of MetricTimeSpan from a note to render it on my guitar hero track.

Docs: https://melanchall.github.io/drywetmidi/articles/high-level-managing/Time-and-length.html#metric

Script:

public class MidiGameManager : MonoBehaviour
{
public string midiFilePath;
public GameObject circlePrefab; // Assign a prefab representing the circle in the Inspector
public Transform linePosition; // Assign the position of the horizontal line in the Inspector
public float tempo;

private MidiFile midiFile;
private IEnumerable<Note> notes;
private TempoMap tempoMap;

void Start()
{
    // Load MIDI file
    midiFile = MidiFile.Read(midiFilePath);

    // Create a tempo map with the specified tempo
    tempoMap = TempoMap.Create(Tempo.FromBeatsPerMinute(tempo));

    // Parse MIDI tracks and extract notes
    notes = midiFile.GetNotes();

    // Start gameplay
    StartCoroutine(PlayNotes());
}

IEnumerator PlayNotes()
{
    foreach (var note in notes)
    {
        // Calculate timing based on note's time and tempo
        MetricTimeSpan noteTiming = note.TimeAs<MetricTimeSpan>(tempoMap);

        // Convert 2 seconds to MetricTimeSpan
        MetricTimeSpan circleOffset = new MetricTimeSpan(0, 0, 2);

        // Calculate timing for circle instantiation (2 seconds before the note)
        MetricTimeSpan circleTiming = noteTiming.Subtract(circleOffset, TimeSpanMode.TimeTime);

        // Wait for the circle to be created
        yield return new WaitForSeconds((float)circleTiming.TotalMicroseconds / 1000000f);

        // Create a circle GameObject at the line position
        GameObject circle = Instantiate(circlePrefab, linePosition.position, Quaternion.identity);

        // Position the circle according to the MIDI note timing
        Vector3 newPosition = circle.transform.position;
        newPosition.x = (float)noteTiming.TotalMicroseconds / 1000000f; // Adjust x position based on note timing
        circle.transform.position = newPosition;
    }
}

}

[melanchall]

Hi,

You should use TimeSpanMode.TimeLength.