public static void SetCircle(this Ellipse ellipse, Vector2 center, Vector2 another)
{
var radius = Vector2.Subtract(center, another).Length;
var x = center.X - radius;
var y = center.Y - radius;
ellipse.Width = ellipse.Height = radius * 2;
ellipse.Margin = new Thickness(x, y, 0, 0);
}