def shuffle(seq):
for i in range(len(seq) - 1, 0, -1):
j = rng() % (i + 1)
seq[i], seq[j] = seq[j], seq[i]
def mark_sensitive(self, from_y, to_y):
wx = self.WIDTH-4 # avoid scroll bar
for y in range(from_y, to_y):
ln = max(2, ckcc.rng() % 32)
self.dis.line(wx-ln, y, wx, y, 1)