/// <summary>
/// PickRandomDirection is used by InitializeParticles to decide which direction
/// particles will move. The default implementation is a random vector in a
/// circular pattern.
/// </summary>
protected virtual Vector2 PickRandomDirection()
{
float angle = RandomHelper.RandomBetween(0, MathHelper.TwoPi);
return(new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle)));
}
