protected override void GetParticlePositionAndOrientation(Snapshot snap, ref Vector2 position, ref Vector2 orientation)
{
SpiralSnapshot spiralSnap = (SpiralSnapshot)snap;
float angle = MathHelper.Lerp(0f, MathHelper.TwoPi, _curTime);
position.X = orientation.X = (float)Math.Sin(angle);
position.Y = orientation.Y = (float)Math.Cos(angle);
position.X *= spiralSnap.Radius;
position.Y *= spiralSnap.Radius;
}
protected override void TakeSnapshot(ref Snapshot snap)
{
SpiralSnapshot spiralSnap = (SpiralSnapshot)snap;
spiralSnap.Radius = _radius;
}
