private void ModelStarChangedEventHandler(object sender, StarChangedEventArgs e)
{
if (e.Disappeared && _stars.ContainsKey(e.Point))
{
FrameworkElement control = _stars[e.Point];
_sprites.Remove(control);
}
else
{
if (!_stars.ContainsKey(e.Point))
{
FrameworkElement starControl = InvadersHelper.StarControlFactory(Scale);
InvadersHelper.SendToBack(starControl);
_stars.Add(e.Point, starControl);
_sprites.Add(starControl);
InvadersHelper.SetCanvasLocation(starControl, e.Point.X, e.Point.Y, Scale);
}
else
{
// Create a shooting star
FrameworkElement starControl = _stars[e.Point];
InvadersHelper.MoveElementOnCanvas(starControl,
InvadersModel.PlayAreaSize.Width,
InvadersModel.PlayAreaSize.Height,
Scale);
}
}
}
