ipycanvas: John Conway's Game Of Life¶

from time import sleep

import numpy as np

from ipycanvas import RoughCanvas, hold_canvas

def life_step(x):
    """Game of life step"""
    nbrs_count = sum(np.roll(np.roll(x, i, 0), j, 1)
                     for i in (-1, 0, 1) for j in (-1, 0, 1)
                     if (i != 0 or j != 0))
    return (nbrs_count == 3) | (x & (nbrs_count == 2))


def draw(x, canvas, color='black'):
    with hold_canvas(canvas):
        canvas.clear()
        canvas.fill_style = '#FFF0C9'
        canvas.stroke_style = 'white'
        canvas.rough_fill_style = 'solid'
        canvas.fill_rect(-10, -10, canvas.width + 10, canvas.height + 10)
        canvas.rough_fill_style = 'cross-hatch'

        canvas.fill_style = color
        canvas.stroke_style = color

        living_cells = np.where(x)
        
        rects_x = living_cells[0] * n_pixels
        rects_y = living_cells[1] * n_pixels

        canvas.fill_rects(rects_x, rects_y, n_pixels)
        canvas.stroke_rects(rects_x, rects_y, n_pixels)



glider_gun =\
[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0],
 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0],
 [0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1],
 [0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1],
 [1,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
 [1,1,0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,1,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0],
 [0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0],
 [0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
 [0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]

x = np.zeros((50, 70), dtype=bool)
x[1:10,1:37] = glider_gun

n_pixels = 15

canvas = RoughCanvas(width=x.shape[0]*n_pixels, height=x.shape[1]*n_pixels)
canvas.fill_style = '#FFF0C9'
canvas.stroke_style = 'white'
canvas.fill_rect(0, 0, canvas.width, canvas.height)

draw(x, canvas, '#5770B3')

display(canvas)

for _ in range(100):
    x = life_step(x)
    draw(x, canvas, '#5770B3')

    sleep(0.1)