Created
December 5, 2018 20:13
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import random | |
class ASCIICanvas: | |
def __init__(self, w=50, h=100): | |
assert 0 < w < 1000 and 0 < h < 1000 | |
self.w = w | |
self.h = h | |
self.buffer = [] | |
self.clear() | |
self.pen = (0, 0) | |
def clear(self): | |
self.buffer = [' '] * self.w * self.h | |
def __str__(self): | |
w, h = self.w, self.h | |
rows = [] | |
for i in range(0, w * h, w): | |
rows.append(''.join(self.buffer[i:i + w])) | |
return '\n'.join(rows) | |
def __setitem__(self, key, value): | |
assert type(value) == str and len(value) == 1 | |
x, y = key | |
assert 0 <= x < self.w and 0 <= y < self.h | |
self.buffer[x + self.w * y] = value | |
def __getitem__(self, key): | |
x, y = key | |
assert 0 <= x < self.w and 0 <= y < self.h | |
return self.buffer[x + self.w * y] | |
def move(self, x, y): | |
assert 0 <= x < self.w and 0 <= y < self.h | |
self.pen = (x, y) | |
def dot(self, symbol='*'): | |
self[self.pen] = symbol | |
def crawl(self, direction, steps, dry=False): | |
dir_map = { | |
'n': (0, -1, '|'), | |
's': (0, 1, '|'), | |
'w': (-1, 0, '-'), | |
'e': (1, 0, '-'), | |
'nw': (-1, -1, '\\'), | |
'ne': (1, -1, '/'), | |
'se': (1, 1, '\\'), | |
'sw': (-1, 1, '/'), | |
} | |
assert direction in dir_map, 'invalid direction' | |
dx, dy, symbol = dir_map[direction] | |
for _ in range(steps): | |
if not dry: | |
self.dot(symbol) | |
self.pen = self.pen[0] + dx, self.pen[1] + dy | |
if not dry: | |
self.dot(symbol) | |
def line(self, x, y, direction, steps): | |
self.move(x, y) | |
self.crawl(direction, steps) | |
def christmas_tree(c: ASCIICanvas, n_balls_max=30, p=4, steps=6): | |
c.clear() | |
cx = c.w // 2 | |
# left side | |
c.move(cx, 1) | |
for s in range(steps): | |
c.crawl('sw', p) | |
c.crawl('e', p // 2) | |
# right side | |
c.move(cx + 1, 1) | |
for s in range(steps): | |
c.crawl('se', p) | |
c.crawl('w', p - 2) | |
# bottom | |
c.crawl('w', steps * p + 2) | |
# trunc | |
trunc_h = 5 | |
_, y = c.pen | |
c.move(cx - 2, y + 1) | |
c.crawl('s', trunc_h) | |
c.crawl('e', 5) | |
c.crawl('n', 1, dry=True) | |
c.crawl('n', trunc_h - 1) | |
# balls | |
y0 = 2 | |
y1 = steps * p + y0 - 1 | |
balls = ['*', 'o', '*', '@'] | |
def is_good_for_ball(x, y): | |
neighours = [ | |
[x, y], | |
[x, y + 1], | |
[x, y - 1], | |
[x + 1, y], | |
[x - 1, y] | |
] | |
for n in neighours: | |
if c[n] != ' ': | |
return False | |
return True | |
for y in range(y0, y1): | |
a0 = y * c.w | |
a1 = a0 + c.w | |
line = c.buffer[a0:a1] | |
start = line.index('/') | |
end = line.index('\\') | |
if start > 0 and end > 0: | |
for _ in range(20): | |
x = random.randrange(start + 1, end) | |
if is_good_for_ball(x, y): | |
c[x, y] = random.choice(balls) | |
def frame_it(s: str): | |
detected_length = s.find('\n') | |
s = '|' + s.replace('\n', '|\n|') + '|' | |
top_bot = '\n*' + '-' * detected_length + '*\n' | |
return top_bot + s + top_bot | |
c = ASCIICanvas(61, 32) | |
christmas_tree(c) | |
print(frame_it(str(c))) |
Author
tirinox
commented
Dec 5, 2018
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