How would you end the loop once the sprite has touched the wall?

Question

So I've been struggling for a while to do this. I want the main loop to end/ the game to end once the player hits the border of the screen but can't seem to figure out how I would do this. Here's what I have so far:

import pygame
pygame.init()

class Player(pygame.sprite.Sprite):
    def __init__(self, color):
        super().__init__()
        self.image = pygame.Surface([25, 25])
        self.image.fill(color)
        self.color = color
        self.rect = self.image.get_rect()

    def moveRight(self, pixels):
        if self.rect.x + pixels > 500 - 25:
            self.rect.x = 500 - 25
        self.rect.x += pixels

    def moveLeft(self, pixels):
        if self.rect.x - pixels < 0:
            self.rect.x = 0
        else:
            self.rect.x -= pixels

    def moveUp(self, pixels):
        if self.rect.y - pixels < 0:
            self.rect.y = 0
        else:
            self.rect.y -= pixels

    def moveDown(self, pixels):
        if self.rect.y + pixels > 500 - 25:
            self.rect.y = 500 - 25
        else:
            self.rect.y += pixels

# Color
red = (255, 0, 0)
white = (255, 255, 255)

screen = pygame.display.set_mode([500,500])

# Sprite List
sprite_list = pygame.sprite.Group()
block_list = pygame.sprite.Group()

# Player
player = Player(red)
player.rect.x = 250
player.rect.y = 250
sprite_list.add(player)

notDone = True
clock = pygame.time.Clock()

while notDone:
    current_time = pygame.time.get_ticks()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            notDone = False

    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT] or keys[pygame.K_a]:
        player.moveLeft(3)
    if keys[pygame.K_RIGHT] or keys[pygame.K_d]:
        player.moveRight(3)
    if keys[pygame.K_UP] or keys[pygame.K_w]:
        player.moveUp(3)
    if keys[pygame.K_DOWN] or keys[pygame.K_s]:
        player.moveDown(3)

    screen.fill(white)

    sprite_list.draw(screen)
    pygame.display.flip()

    clock.tick(60)

pygame.quit()

In my example, the player sprite can move up, down, left, and right. The character also cannot move past the border. Is there a way for the loop to end (as if a game over) once the sprite hits said border?

sloth · Accepted Answer

If you want to end the game when the player rect hits the screen's edge, then there's no point in correcting the player's position if the player goes outside. It would be easier to use Rect.clamp_ip anyway.

As for quitting the game, the easiest way is to put your main loop in a function and just return in case you want to exit.

To check if a rect (like the player's) "leaves" another rect (like the rect of the screen), you can use the Rect.contains function.

import pygame


class Player(pygame.sprite.Sprite):
    def __init__(self, color):
        super().__init__()
        self.image = pygame.Surface([25, 25])
        self.image.fill(color)
        self.rect = self.image.get_rect()

    def moveRight(self, pixels):
        self.rect.x += pixels

    def moveLeft(self, pixels):
        self.rect.x -= pixels

    def moveUp(self, pixels):
        self.rect.y -= pixels

    def moveDown(self, pixels):
        self.rect.y += pixels

def main():
    pygame.init()
    screen = pygame.display.set_mode([500,500])

    # Sprite List
    sprite_list = pygame.sprite.Group()
    block_list = pygame.sprite.Group()

    # Player
    player = Player('red')
    player.rect.x = 250
    player.rect.y = 250
    sprite_list.add(player)

    clock = pygame.time.Clock()

    while True:
        current_time = pygame.time.get_ticks()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return

        keys = pygame.key.get_pressed()
        if keys[pygame.K_LEFT] or keys[pygame.K_a]:
            player.moveLeft(3)
        if keys[pygame.K_RIGHT] or keys[pygame.K_d]:
            player.moveRight(3)
        if keys[pygame.K_UP] or keys[pygame.K_w]:
            player.moveUp(3)
        if keys[pygame.K_DOWN] or keys[pygame.K_s]:
            player.moveDown(3)

        if not screen.get_rect().contains(player.rect):
            return

        screen.fill('white')

        sprite_list.draw(screen)
        pygame.display.flip()

        clock.tick(60)

main()

How would you end the loop once the sprite has touched the wall?

Answers (2)

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