public Explode(PointD pos, Size sz, double period,double delay=0.0)
: base(InitialImage(), pos, ImagePasteMode.Gradient, EffectDock.World)
{
PointD p = Background.WorldToClientD(pos);
p = p.Add(RANDOM.NextPointD(sz.Half()));
LOC = Background.ClientToWorld(p);
STATE = 0.0;
STATE_SPEED = 2.0 / (CONST.UpdateFrequency * period);
DELAY = (CONST.UpdateFrequency * RANDOM.NextDouble() * delay).Round();
}
