Create cool streams of art.

stream.py

"""
Generate a stream of characters that look like rain drops.
"""
import random
import time


class Bullet(object):
    def __init__(self, pos=0, char='*', speed=1):
        self.pos = pos
        self.char = char
        self.speed = speed

    def update(self, chars):
        chars[self.pos] = self.char
        self.pos = (self.pos + self.speed) % len(chars)

class RandomBullet(object):
    def __init__(self, pos=0, char='*', p=1, bias=0):
        self.pos = pos
        self.char = char
        self.p = p
        self.bias = bias

    def update(self, chars):
        if random.random() <= self.p:
            chars[self.pos] = self.char
        speed = int(round(random.randint(-1, 1) + self.bias))
        self.pos = (self.pos + speed) % len(chars)

effects = [
    # Bullet(),
    # Bullet(char='C', speed=-1),
    RandomBullet(p=0.02, char='C'),
    RandomBullet(p=0.02, char='E'),
    RandomBullet(p=0.02, char='A'),
    RandomBullet(p=0.02, char='S'),
    RandomBullet(p=0.02, char='A'),
    RandomBullet(p=0.02, char='R'),
]
pos = 0
while True:
    chars = [' '] * 80
    for effect in effects:
        effect.update(chars)
    print(''.join(chars))
    time.sleep(0.01)