Displaying text onto pygame window from file using readline()

Question

I'm currently trying to read text from a .txt file then display it onto a pygame window. The problem I'm facing is that it just displays nothing at all when I try to read through the whole txt file using a readline() loop. When I run the code below, it prints all the lines to the terminal but doesn't display it onto the pygame window.

import pygame
from pygame.locals import *

pygame.init()
screen=pygame.display.set_mode([800,600])

red = (255,0,0)
yellow = (255, 191, 0)


file = open('file.txt')
count = 0
  
while True:
    count += 1
  
    # Get next line from file
    line = file.readline()
  
    # if line is empty
    # end of file is reached
    if not line:
        break
    print("Line{}: {}".format(count, line.strip()))
  
file.close()

centerx, centery = screen.get_rect().centerx, screen.get_rect().centery
deltaY = centery + 50  # adjust so it goes below screen start


running =True
while running:
    for event in pygame.event.get():
        if event.type == QUIT:
            running = False

    screen.fill(0)
    deltaY-= 1
    i=0
    msg_list=[]
    pos_list=[]
    pygame.time.delay(10)
    font = pygame.font.SysFont('impact', 30)

    for line in line.split('\n'):
        msg=font.render(line, True, yellow)
        msg_list.append(msg)
        pos= msg.get_rect(center=(centerx, centery+deltaY+30*i))
        pos_list.append(pos)
        i=i+1
        
    
    for j in range(i):
        screen.blit(msg_list[j], pos_list[j])
        
    pygame.display.update()


pygame.quit()`

What I've tried to do is use a different way to read all the text from the file but this just ends up printing the very last line in the .txt file opposed to displaying the whole thing. I believe using the readline() method would be much more effiecent as that reads the file line by line and then displays it onto the pygame window. It also might be helpful to know I am trying to display the text line by line on the window such as:

    hello
    bonjour
    hola
    welcome

file = open('file.txt')
for line in file:
    movie_credits = line
file.close()

centerx, centery = screen.get_rect().centerx, screen.get_rect().centery
deltaY = centery + 50  # adjust so it goes below screen start


running =True
while running:
    for event in pygame.event.get():
        if event.type == QUIT:
            running = False

    screen.fill(0)
    deltaY-= 1
    i=0
    msg_list=[]
    pos_list=[]
    pygame.time.delay(10)
    font = pygame.font.SysFont('impact', 30)

    for line in movie_credits.split('\n'):
        msg=font.render(line, True, yellow)
        msg_list.append(msg)
        pos= msg.get_rect(center=(centerx, centery+deltaY+30*i))
        pos_list.append(pos)
        i=i+1
        
    
    for j in range(i):
        screen.blit(msg_list[j], pos_list[j])
        
    pygame.display.update()


pygame.quit()

Rabbid76 · Answer 1 · 2022-12-04T10:59:24.027

You have to add the lines read from the file to a list (see How to read a file line-by-line into a list?):

list_of_lines = []
with open('file.txt') as file:
    list_of_lines = [line.rstrip() for line in file]

After that you can render the text lines from the list:

font = pygame.font.SysFont('impact', 30)
msg_list = []
for line in list_of_lines:
    msg = font.render(line, True, yellow)
    msg_list.append(msg)

Complete example:

import pygame
from pygame.locals import *

pygame.init()
screen=pygame.display.set_mode([800,600])
clock = pygame.time.Clock()

red = (255,0,0)
yellow = (255, 191, 0)

list_of_lines = []
with open('file.txt') as file:
    list_of_lines = [line.rstrip() for line in file]
file.close()

font = pygame.font.SysFont('impact', 30)
msg_list = []
for line in list_of_lines:
    msg = font.render(line, True, yellow)
    msg_list.append(msg)

centerx, centery = screen.get_rect().centerx, screen.get_rect().centery
deltaY = centery + 50  # adjust so it goes below screen start

running =True
while running:
    clock.tick(100)
    for event in pygame.event.get():
        if event.type == QUIT:
            running = False

    screen.fill(0)
        
    deltaY -= 1
    for i, msg in enumerate(msg_list):
        pos = msg.get_rect(center=(centerx, centery + deltaY + 30 * i))
        screen.blit(msg, pos)
        
    pygame.display.update()

pygame.quit()

Displaying text onto pygame window from file using readline()

1 Answers1

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