Creating barriers/boundaries help for Pygame

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Creating barriers/boundaries help for Pygame - bluewing101 - Mar-19-2020

In my code, I have been trying to create barriers so the character doesn't go outside the pygame window
Here is the code:

import pygame
from pygame.locals import *

import random 

pygame.init()
width, height = 640,480
hbox = 20
vbox = 20
controls =[False, False, False, False]
playerpos =[100,100]
red = (255, 0, 0)
green = (0, 255, 0)
blue = (0, 0, 255)


screen=pygame.display.set_mode((width, height))
rect = pygame.Rect(300, 220, hbox, vbox)
player = pygame.image.load("resources/images/pac.png")
grass = pygame.image.load("resources/images/grass.png")
coin = pygame.image.load("resources/images/coin.png")
player = pygame.transform.scale(player, (30,30))
coin = pygame.transform.scale(coin, (20,20))
l = random.randint(0,480)
k = random.randint(0,640)
n = random.randint(480,640)
walls = (
    pygame.Rect(0, 0, 640, 10),
    pygame.Rect(0, 0, 10, 480),
    pygame.Rect(630, 0, 10, 480),
    pygame.Rect(0, 470, 640, 10),
    )
bar = (
    pygame.Rect(230, 170, 160, 10),
    pygame.Rect(230, 170, 10, 140),
    pygame.Rect(230, 310, 160, 10),
    pygame.Rect(390, 170, 10, 150),
    )

while 1:
    
    screen.fill(0)
    moved = None
    for x in range(width//grass.get_width()+1):
        for y in range(height//grass.get_height()+1):
            screen.blit(grass,(x*100,y*100))
    screen.blit(player, playerpos)

    screen.blit(coin, (l,k))
    
    
    
    for wall in walls:
        pygame.draw.rect(screen, pygame.Color("red"), wall)
    for bars in bar:
        pygame.draw.rect(screen, pygame.Color("red"), bars)
    pygame.display.flip()
    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key==K_w:
                controls[0]=True
            elif event.key==K_a:
                controls[1]=True
            elif event.key==K_s:
                controls[2]=True
            elif event.key==K_d:
                controls[3]=True
        if event.type == pygame.KEYUP:
            if event.key==pygame.K_w:
                controls[0]=False
            elif event.key==pygame.K_a:
                controls[1]=False
            elif event.key==pygame.K_s:
                controls[2]=False
            elif event.key==pygame.K_d:
                controls[3]=False
    if controls[0]:
        playerpos[1]-=2
        #sleep(1)
    elif controls[2]:
        playerpos[1]+=2
    if controls[1]:
        playerpos[0]-=2
    elif controls[3]:
        playerpos[0]+=2


        if event.type==pygame.QUIT:
            pygame.quit() 
            exit(0)

Can you please help me how to do it

RE: Creating barriers/boundaries help for Pygame - michael1789 - Mar-19-2020

Tell the program that if your characters edge passes the edge of the screen to reset it to be on the screen. If you are using your pygame rect it is like this:

character.image = pygame.transform.scale(player, (30,30))
character.rect = character.image.get_rect()

if character.rect.right is > width:
    character.rect.right = width

I encourage you to learn the pygame Sprite class. It will make things a lot easier (like collecting coins) going forward.

This video helped me:
https://www.youtube.com/watch?v=Eltz-XJMxuU