private void ModelStarChangedEventHandler(object sender, StarChangedEventArgs e)
{
if (e.isDisappeared && _stars.ContainsKey(e.Point))
{
FrameworkElement starControl = _stars[e.Point];
_sprites.Remove(starControl);
}
else
{
if (!_stars.ContainsKey(e.Point))
{
FrameworkElement starControl = InvadersHelper.StarControlFactory(e.Point, Scale);
_stars[e.Point] = starControl;
_sprites.Add(starControl);
}
else
{
FrameworkElement starControl = _stars[e.Point];
InvadersHelper.SetCanvasLocation(starControl, e.Point.X * Scale, e.Point.Y * Scale);
}
}
}