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from random import sample
import time
def add_spawns(map_, n_spawns):
available = []
for x, y, cell in iter_board(map_):
if cell != '*':
available.append((x, y))
spawns = sample(available, n_spawns)
for i, (x, y) in enumerate(spawns):
map_[y][x] = str(i)
def empty_map(width, height, n_spawns):
board = [['.'] * width for y in range(height)]
add_spawns(board, n_spawns)
return board
def border_map(width, height, n_spawns):
board = [
['.'] * (width + 2)
for y in range(height + 2)
]
for x in range(width + 2):
board[0][x] = '*'
board[-1][x] = '*'
for y in range(height + 2):
board[y][0] = '*'
board[y][-1] = '*'
add_spawns(board, n_spawns)
return board
def rate_limit(fps):
delay_ms = 1. / fps
while True:
# time one iteration of the loop
start = time.time()
yield
end = time.time()
yield_time = end - start
# delay to fill up the rest of the time
wait_time = delay_ms - yield_time
if wait_time < 0:
# TODO: log failure
# log.debug('not meeting rate (%.2f ms)' % (wait_time * 1000))
continue
time.sleep(wait_time)
def iter_board(board):
for y, row in enumerate(board):
for x, cell in enumerate(row):
yield x, y, cell
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