ligths Out for "Coding the Matrix: Linear Algebra through Computer Science Applications" You need pygame to run this and you have to place this file inside your matrix-folder (where it can find GF2.py and your vec.py) Then you can run it with "python3 ligthOut.py" Mouseclick will switch the ligth according to the rules of the game To exit click …

lightsOut.py

import pygame
import random
import math

from vec import Vec
from GF2 import *

pygame.init()

screen_width = 600
screen_height = 600

screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("lights OUT!")

done = False
is_blue = True

size_x = 5
size_y = 5

rect_width = screen_width / size_x
rect_height = screen_height / size_y

coords = { (x,y) for x in range(size_x) for y in range (size_y) }
lights = Vec (coords, {})

def getRect(margin, x,y):
        left = x * rect_width + margin/2
        top = y * rect_height + margin/2
        return pygame.Rect(left, top, rect_width - margin, rect_height - margin)

def getCoords(sx, sy):
        x = math.floor(sx / rect_width)
        y = math.floor(sy / rect_height)
        return (x,y)

def inBounds(x,y):
        return x >= 0 and x < size_x and y >= 0 and y < size_y

def getEnv(x,y):
        env = [(x,y), (x-1,y), (x+1,y), (x,y-1), (x,y+1)]
        return ((x,y) for (x,y) in env if inBounds(x,y))

def isLightOn(x,y):
        return lights[(x,y)] == one

def switchLight(x,y):
        lights[(x,y)] = one - lights[(x,y)]

def clickOn(x,y):
        for (a,b) in getEnv(x,y):
                switchLight(a,b)

def drawLight (x,y):
        grey = (10,10,10)
        color = (100,10,10)
        if isLightOn(x,y): color = (10, 250, 10)
        pygame.draw.rect(screen, grey, getRect(2, x,y), 0)
        pygame.draw.ellipse(screen, color, getRect(8, x,y), 0)

def drawLights():
        for (x,y) in coords:
                drawLight(x,y)

def randomizeLights():
        random.seed()
        cs = list(coords)
        for i in range(2 * size_x):
                (x,y) = random.choice(cs)
                clickOn(x,y)

# comment the next line if you want a clean board
randomizeLights()

fpsClock = pygame.time.Clock()

while not done:

        # input
        for event in pygame.event.get():
                if event.type == pygame.QUIT:
                        done = True
                if event.type == pygame.KEYDOWN:
                        if event.key == pygame.K_ESCAPE:
                            done = True
                if event.type == pygame.MOUSEBUTTONDOWN and event.button == 1:
                        (sx, sy) = pygame.mouse.get_pos()
                        (x,y) = getCoords(sx, sy)
                        clickOn (x,y)

        

        # drawing       
        screen.fill((0, 0, 0))
        drawLights()
        
        pygame.display.flip()

        # wait
        fpsClock.tick(60)