Question

我试图通过按箭头键向左或向右移动精灵（称为Player）。向右或向左移动将通过更改子画面矩形的中心进行。如您所见，我试图从精灵的x坐标中添加/减去8，以便将其向右或向左移动。但是，当我按下箭头键时，精灵不会移动。我怎样才能解决这个问题？

import pygame
import random
import time
import pygame as pg


# set the width and height of the window
width = 800
height = 370
groundThickness = 30
pheight = 50
pwidth = 50
playerx = 0+pwidth
playery = height-groundThickness-pheight/2
fps = 30
# define colors
white = (255, 255, 255)
black = (0, 0, 0)
red = (5, 35, 231)
# initialize pygame 
pygame.init()

# initialize pygame sounds
pygame.mixer.init()
# create window
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("my game")
clock = pygame.time.Clock()

class Player(pygame.sprite.Sprite):
        def __init__(self):
            pygame.sprite.Sprite.__init__(self)
            self.image = pygame.Surface((pwidth, pheight))
            self.image.fill(red)
            self.rect = self.image.get_rect()
            self.rect.center = (playerx, playery)

all_sprites = pygame.sprite.Group()
player = Player()
all_sprites.add(player)

# Game loop
running = True
x_change = 0
while running:
    # keep loop running at the right speed
    clock.tick(fps)
    # Process input (events)
    for event in pygame.event.get():
        # check for closing window
        if event.type == pygame.QUIT:
            running = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                print("left")
                x_change = -8
            elif event.key == pygame.K_RIGHT:
                print("right")
                x_change = 8
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                x_change = 0
        print(x_change)
        playerx += x_change
        all_sprites.update()



    #ground
    pygame.draw.rect(screen, (0,255,0), ((0, height-groundThickness), (width, groundThickness)))



    # Update
    all_sprites.update()



    # Draw / render
    all_sprites.draw(screen)
    pygame.display.update()
    # AFTER drawing everything, flip the display
    pygame.display.flip()

pygame.quit()

Answer 1

您从未更改精灵player的位置。您希望它如何移动？您要做的只是更改局部变量playerx的值，但您从未将这一更改推回到sprite对象中。

首先在下面添加中间行：

    playerx += x_change
    player.rect.center = (playerx, playery)
    all_sprites.update()

看看这会如何改变事情？你可以从那里拿走吗？

Answer 2

还需要用背景颜色或图像填充屏幕，以使屏幕更新为移动的精灵的当前位置。以下命令将添加到游戏循环的绘制/渲染部分的顶部：

screen.fill(black)

精灵不会在pygame中向左或向右移动

2 个答案: