Python 如何阻止pygame中的角色离开屏幕边缘？

我在pygame中创建了一个小程序，玩家可以控制一个围绕屏幕移动的蓝色方块，但我想阻止玩家移动到屏幕边缘。这是我到目前为止的代码，我如何才能做到这一点

import pygame

pygame.init()
screen = pygame.display.set_mode((800, 600))
done = False
x = 30
y = 30

clock = pygame.time.Clock()

while not done:
        for event in pygame.event.get():
                if event.type == pygame.QUIT:
                        done = True
                if event.type == pygame.KEYDOWN and event.key == pygame.K_SPACE:
                        is_blue = not is_blue


    pressed = pygame.key.get_pressed()
    if pressed[pygame.K_UP]: y -= 5
    if pressed[pygame.K_DOWN]: y += 5
    if pressed[pygame.K_LEFT]: x -= 5
    if pressed[pygame.K_RIGHT]: x += 5

    screen.fill((0, 0, 0))
    color = (0, 128, 255)
    pygame.draw.rect(screen, color, pygame.Rect(x, y, 60, 60))

    pygame.display.flip()
    clock.tick(60)

比如：

if pressed[pygame.K_UP]:
    if not (y > maxwidth or y < 0):
        y += 5

如果按下[pygame.K_UP]：
如果不是（y>maxwidth或y<0）：
y+=5

其他人也是如此。在您的代码中，

maxwidth

看起来像是600，但我会把它放在代码的顶部，这样您就不必在不同的地方不断更改它了。

这应该行得通

if pressed[pygame.K_UP] and y > 0: y -= 5
if pressed[pygame.K_DOWN] and y < 600 - 60: y += 5
if pressed[pygame.K_LEFT] and x > 0: x -= 5
if pressed[pygame.K_RIGHT] and x < 800 - 60: x += 5

如果按下[pygame.K_UP]且y>0:y-=5
如果按下[pygame.K_DOWN]且y<600-60:y+=5
如果按下[pygame.K_LEFT]且x>0:x-=5
如果按下[pygame.K_RIGHT]且x<800-60:x+=5

---

其中，600和800是屏幕大小，60是矩形的大小，您尝试执行的操作称为边缘检测，如在“检测”中，如果您位于边缘，则希望边缘成为屏幕的边缘。您应该做的是检查您的

x

或

y

是否处于边缘，如果处于边缘，请不要再继续

if pressed[pygame.K_UP]: 
    if 0 < y-5 < 600:  #0 and 600 being the edges of your screen, you can use a variable to change it dynamically later one  
        y -= 5

---

这将检查正方形的另一侧。注意：对于

x

，您将检查水平极限，在本例中为

800

。此外，我们正在检查是否包含

-5

，因为我们想知道我们要去哪里，而不是我们在哪里

pygame.Rect

s有一种（和

climp_ip

）方法，可用于限制移动区域。因此，创建一个屏幕大小的rect（此处称为

screen\u rect

）和一个播放器的rect（

player\u rect

），并在每次移动后调用

clamp\u ip

方法，使其保持在屏幕区域内

import pygame as pg


pg.init()
screen = pg.display.set_mode((640, 480))
BG_COLOR = pg.Color(30, 30, 50)


def main():
    clock = pg.time.Clock()
    image = pg.Surface((50, 30))
    image.fill(pg.Color('dodgerblue'))
    pg.draw.rect(image, pg.Color(40, 220, 190), (0, 0, 49, 29), 2)
    player_rect = image.get_rect(topleft=(200, 200))
    # This pygame.Rect has the dimensions of the screen and
    # is used to clamp the player_rect to this area.
    screen_rect = screen.get_rect()
    speed = 5

    while True:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                return

        pressed = pg.key.get_pressed()
        if pressed[pg.K_UP]:
            player_rect.y -= speed
        if pressed[pg.K_DOWN]:
            player_rect.y += speed
        if pressed[pg.K_LEFT]:
            player_rect.x -= speed
        if pressed[pg.K_RIGHT]:
            player_rect.x += speed
        # Clamp the rect to the dimensions of the screen_rect.
        player_rect.clamp_ip(screen_rect)

        screen.fill(BG_COLOR)
        screen.blit(image, player_rect)

        pg.display.flip()
        clock.tick(60)


if __name__ == '__main__':
    main()
    pg.quit()

---

我将如何调整这一点以适应其他方向的工作？这应该是公认的答案

climp_-ip

是一种非常简单的方法。

import pygame as pg


pg.init()
screen = pg.display.set_mode((640, 480))
BG_COLOR = pg.Color(30, 30, 50)


def main():
    clock = pg.time.Clock()
    image = pg.Surface((50, 30))
    image.fill(pg.Color('dodgerblue'))
    pg.draw.rect(image, pg.Color(40, 220, 190), (0, 0, 49, 29), 2)
    player_rect = image.get_rect(topleft=(200, 200))
    # This pygame.Rect has the dimensions of the screen and
    # is used to clamp the player_rect to this area.
    screen_rect = screen.get_rect()
    speed = 5

    while True:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                return

        pressed = pg.key.get_pressed()
        if pressed[pg.K_UP]:
            player_rect.y -= speed
        if pressed[pg.K_DOWN]:
            player_rect.y += speed
        if pressed[pg.K_LEFT]:
            player_rect.x -= speed
        if pressed[pg.K_RIGHT]:
            player_rect.x += speed
        # Clamp the rect to the dimensions of the screen_rect.
        player_rect.clamp_ip(screen_rect)

        screen.fill(BG_COLOR)
        screen.blit(image, player_rect)

        pg.display.flip()
        clock.tick(60)


if __name__ == '__main__':
    main()
    pg.quit()