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'''
Conway's Game Of Life for the micro:bit
Press button A or tap the micro:bit to generate a fresh layout.
'''
import microbit
import random
arena1 = bytearray(7 * 7)
arena2 = bytearray(7 * 7)
def show():
img = microbit.Image(5,5)
for y in range(5):
for x in range(5):
img.set_pixel(x, y, arena1[8 + y * 7 + x]*9)
microbit.display.show(img)
# do 1 iteration of Conway's Game of Life
def conway_step():
global arena1, arena2
for i in range(5 * 5): # loop over pixels
i = 8 + (i // 5) * 7 + i % 5
# count number of neighbours
num_neighbours = (arena1[i - 8] +
arena1[i - 7] +
arena1[i - 6] +
arena1[i - 1] +
arena1[i + 1] +
arena1[i + 6] +
arena1[i + 7] +
arena1[i + 8])
# check if the centre cell is alive or not
self = arena1[i]
# apply the rules of life
if self and not (2 <= num_neighbours <= 3):
arena2[i] = 0 # not enough, or too many neighbours: cell dies
elif not self and num_neighbours == 3:
arena2[i] = 1 # exactly 3 neighbours around an empty cell: cell is born
else:
arena2[i] = self # stay as-is
# swap the buffers (arena1 is now the new one to display)
arena1, arena2 = arena2, arena1
while True:
# randomise the start
for i in range(5 * 5): # loop over pixels
i = 8 + (i // 5) * 7 + i % 5
arena1[i] = random.randrange(2) # set the pixel randomly
show()
microbit.sleep(1) # need to yield to update accelerometer (not ideal...)
# loop while button a is not pressed
while not microbit.button_a.is_pressed() and microbit.accelerometer.get_z() < -800:
conway_step()
show()
microbit.sleep(150)
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