import pyxel

largeur = 1000
hauteur = 1000
case = 5
grid = []

for k in range(hauteur):
    row = []
    for i in range(largeur):
        row.append(0)
    grid.append(row)

x = largeur // 2
y = hauteur // 2

deplacement = 0
def update():
    global x, y, deplacement

    if grid[y][x] == 0:
        deplacement = (deplacement + 1) % 4 
        grid[y][x] = 1
    else:
        deplacement = (deplacement - 1) % 4
        grid[y][x] = 0

    if deplacement == 0:
        y -= 1
    elif deplacement == 1:
        x += 1
    elif deplacement == 2:
        y += 1
    elif deplacement == 3:
        x -= 1

    x %= largeur
    y %= hauteur

def draw():
    pyxel.cls(7)
    for j in range(hauteur):
        for i in range(largeur):
            if grid[j][i] == 1:
                pyxel.rect(i * case, j * case, case, case, 0)
    pyxel.rect(x * case, y * case, case, case, 8)

pyxel.init(largeur * case, hauteur * case)
pyxel.run(update, draw)