public override void _Ready()
{
var v = new Vector2i();
var vx = ReactiveProperty.FromMember(v, v => v.x);
var vy = ReactiveProperty.FromMember(v, v => v.y);
var vs = ReactiveProperty.Computed(vx, vy, (x, y) => x + y);
vs.Subscribe(x => Text = $"{x} ({v.x}, {v.y})")
.DisposeWith(this);
this.OnActionJustPressed("ui_up")
.Subscribe(_ => vx.Value++)
.DisposeWith(this);
this.OnActionJustReleased("ui_up")
.Subscribe(_ => vy.Value++)
.DisposeWith(this);
}