public void GetLengthTest()
{
Vector2D v1 = new Vector2D(100, 200);
var length = v1.GetLength();
Assert.AreEqual(223.6068, Math.Round(length * 10000) / 10000);
}
public Vector2D SetAngle(Vector2D v, float number)
{
var lenght = v.GetLength();
return new Vector2D(Convert.ToSingle(Math.Cos(number) * lenght),
Convert.ToSingle(Math.Sin(number) * lenght));
}