/// <summary>
/// Create an ellipse from the specific RotatedRect
/// </summary>
/// <param name="box2d">The RotatedRect representation of this ellipse</param>
public Ellipse(RotatedRect box2d)
{
_box2D = box2d;
}
/// <summary>
/// Create an ellipse with specific parameters
/// </summary>
/// <param name="center"> The center of the ellipse</param>
/// <param name="size"> The width and height of the ellipse</param>
/// <param name="angle"> The rotation angle in radian for the ellipse</param>
public Ellipse(PointF center, SizeF size, float angle)
{
_box2D = new RotatedRect(center, size, angle);
}