protected override void ParticleDraw(int index, Microsoft.Xna.Framework.Graphics.SpriteBatch batch)
{
sourceRectangle.X = (index % 4) * particleWidth;
pRotation = Easing.EaseOutQuad(t, 0, r0 * 31.4159f * 10);
float len = Easing.EaseOutElastic(t * .5f, 0, r0 * 100, 400);
float pt = index / (float)particleCount;
pPosition.X = (float)Easing.Sin(pt, 0, len) + effectPosition.X;
pPosition.Y = (float)Easing.Cos(pt, 0, len) + effectPosition.Y;
base.ParticleDraw(index, batch);
}