/// <summary>
/// In a derived class, implements logic to render the sample.
/// </summary>
protected virtual void Draw(DemoTime time)
{
}
/// <summary>
/// In a derived class, implements logic to update any relevant sample state.
/// </summary>
protected virtual void Update(DemoTime time)
{
}
protected override void Update(DemoTime time)
{
base.Update(time);
this.Tick?.Invoke(time.ElapseTime);
}