rokojori_action_library/Runtime/Behavior/Movements/MoveOnPath.cs

using Godot;

using Rokojori.Extensions;
namespace Rokojori;

[Tool]
[GlobalClass]
public partial class MoveOnPath:SequenceAction
{
  [Export]
  public Node3D target;

  [Export]
  public Spline spline;

  [Export]
  public float duration = 1f;

  double _elapsed;
  int _activeId = -1;

  protected override void _OnTrigger()
  {
    if ( target == null || spline == null )
    {
      return;
    }

    _elapsed = 0;
    _activeId = DispatchStart();
  }

  public override void _PhysicsProcess( double delta )
  {
    if ( _activeId == -1 )
    {
      return;
    }

    _elapsed += delta;

    var t = duration <= 0 ? 1f : Mathf.Clamp( (float)( _elapsed / duration ), 0f, 1f );

    target.GlobalPosition = spline.GetCurve().PositionAt( t );

    if ( t >= 1f )
    {
      var id = _activeId;
      _activeId = -1;
      DispatchEnd( id );
    }
  }

  public override void CancelAction( int id )
  {
    if ( id == _activeId )
    {
      _activeId = -1;
      DispatchCancelled( id );
    }
  }
}