#!/usr/local/bin/cz --

struct ball
	num x, y, r
	num o, s, v, af
	num vx, vy

ball_init(ball *b)
	b->r = Rand(0.1, 0.2)*360
	b->x = Rand(-w_2+b->r, w_2-b->r) ; b->y = Rand(-h_2+b->r, h_2-b->r)
	b->o = Rand(360) ; b->s = Rand(0.5, 1) ; b->v = Rand(0, 0.5)
	b->af = Rand()
	b->vx = Rand(-12, 12) ; b->vy = Rand(-12, 12)

Main()
	space()

	int n = 5
	getargs(int, n)
	new(v, vec, ball, n)
	repeat(n)
		ball *b = vec_push(v)
		init(b, ball)

	repeat
		clear()
		for_vec(b, v, ball)
			if Rand() < 0.005
				init(b, ball)
			black()
			num f = b->r/360.0
			disc(b->x, b->y, 380*f)
			back(a, 360, 0, 5/f)
				hsv(a*b->af+b->o, b->s, b->v)
				disc(b->x, b->y, a*f)
			b->x += b->vx ; b->y += b->vy
			bounce(b->x, b->vx, -w_2+b->r, <, 1)
			bounce(b->x, b->vx, w_2-b->r, >, 1)
			bounce(b->y, b->vy, -h_2+b->r, <, 1)
			bounce(b->y, b->vy, h_2-b->r, >, 1)
			b->vy -= 0.5
#			b->s *= 0.98
#			b->v *= 0.98
#		csleep(1.0/100)
		Paint()

use b