public void Update(Point origin, bool visible)
{
Horizontal.Visibility = visible ? Visibility.Visible : Visibility.Collapsed;
Vertical.Visibility = Horizontal.Visibility;
if (_offset >= _maxOffset)
{
_offset = 0;
}
var position = origin + new Vector(_offset, _offset);
Horizontal.SetPositionOnCanvas(position);
Vertical.SetPositionOnCanvas(position);
_offset += 1;
}