I'm trying to develop a game based on a raycaster engine. I used an engine for free from GitHub, but I think its from an older iteration of Python. I've already had to correct some syntax with my very limited knowledge of the language, but it's thrown up an error that I have no idea how to fix. Thanks for any help. Ive been learning like 3 days, though I have some understanding of coding through Scratch.

keys=[False]*324

# A map over the world

worldMap = [

[1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2],

[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2],

[2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],

[1, 0, 2, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 2, 3, 2, 3, 0, 0, 2],

[2, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],

[1, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2],

[2, 3, 1, 0, 0, 2, 0, 0, 0, 2, 3, 2, 0, 0, 0, 0, 0, 0, 0, 1],

[1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 0, 2],

[2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 2, 1, 0, 0, 0, 1],

[1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 0, 0, 0, 0, 0, 0, 0, 2],

[2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],

[1, 0, 2, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2],

[2, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 3, 2, 1, 2, 0, 1],

[1, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 2],

[2, 3, 1, 0, 0, 2, 0, 0, 2, 1, 3, 2, 0, 2, 0, 0, 3, 0, 3, 1],

[1, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 1, 0, 0, 2, 0, 0, 2],

[2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 3, 0, 1, 2, 0, 1],

[1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 3, 0, 2],

[2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 1],

[2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1]]

# Closes the program

def close():

pygame.display.quit()

pygame.quit()

def main():

pygame.init()

# Head Up Display information (HUD)

font = pygame.font.SysFont('Verdana',20)

HUD = font.render("F1 / F2 - Screenshot JPEG/BMP F5/F6 - Shadows on/off F7/F8 - HUD Show/Hide", True, (0,0,0))

# Creates window

WIDTH = 1000

HEIGHT = 800

screen = pygame.display.set_mode((WIDTH, HEIGHT))

pygame.display.set_caption('PyRay - Python Raycasting Engine (v0.03)')

showShadow = True

showHUD = True

# Defines starting position and direction

positionX = 3.0

positionY = 7.0

directionX = 1.0

directionY = 0.0

planeX = 0.0

planeY = 0.5

# Movement constants

ROTATIONSPEED = 0.02

MOVESPEED = 0.03

# Trigeometric tuples variables for index

TGM = (math.cos(ROTATIONSPEED), math.sin(ROTATIONSPEED))

ITGM = (math.cos(-ROTATIONSPEED), math.sin(-ROTATIONSPEED))

COS, SIN = (0,1)

while True:

# Catches user input

# Sets keys[key] to True or False

for event in pygame.event.get():

if event.type == KEYDOWN:

if event.key == K_ESCAPE:

close()

return

keys[event.key] = True

elif event.type == KEYUP:

keys[event.key] = False

# Checks with keys are pressed by the user

# Uses if so that more than one button at a time can be pressed.

if keys[K_ESCAPE]:

close()

if keys[K_LEFT]:

oldDirectionX = directionX

directionX = directionX * ITGM[COS] - directionY * ITGM[SIN]

directionY = oldDirectionX * ITGM[SIN] directionY * ITGM[COS]

oldPlaneX = planeX

planeX = planeX * ITGM[COS] - planeY * ITGM[SIN]

planeY = oldPlaneX * ITGM[SIN] planeY * ITGM[COS]

if keys[K_RIGHT]:

oldDirectionX = directionX

directionX = directionX * TGM[COS] - directionY * TGM[SIN]

directionY = oldDirectionX * TGM[SIN] directionY * TGM[COS]

oldPlaneX = planeX

planeX = planeX * TGM[COS] - planeY * TGM[SIN]

planeY = oldPlaneX * TGM[SIN] planeY * TGM[COS]

if keys[K_UP]:

if not worldMap[int(positionX directionX * MOVESPEED)][int(positionY)]:

positionX = directionX * MOVESPEED

if not worldMap[int(positionX)][int(positionY directionY * MOVESPEED)]:

positionY = directionY * MOVESPEED

if keys[K_DOWN]:

if not worldMap[int(positionX - directionX * MOVESPEED)][int(positionY)]:

positionX -= directionX * MOVESPEED

if not worldMap[int(positionX)][int(positionY - directionY * MOVESPEED)]:

positionY -= directionY * MOVESPEED

This is the code in question...

pygame 2.6.0 (SDL 2.28.4, Python 3.10.12)

Hello from the pygame community. https://www.pygame.org/contribute.html

Traceback (most recent call last):

File "/home/alister/Downloads/pyray.py", line 228, in <module>

main()

File "/home/alister/Downloads/pyray.py", line 96, in main

if keys[K_LEFT]:

IndexError: list index out of range

And this was the error...