Fireworks can be set off within the number
of the maximum bits.
A color is random.
A screen can specify arbitrary sizes.
It is beautiful, if a margin is in processing and screen size
will be enlarged.
para_bits : simultaneous bits
(maximum of10000)
para_max : maximum bits (maximum of 10000)
para_blendx : side flows (0-255)
para_blendy : vertical flows (0-255)
para_sound : Sound setup (0:sound nothing 1:explosion are 2:discharge
sound)
