屏幕上的字符不会移动（pygame）

Question

由于某些原因，箭头键不会移动“guy.png”精灵。有没有人有解释为什么？是的，精灵显示在屏幕上，是的，guy.png与项目位于同一个文件夹下。

代码：

import pygame, sys 
from pygame.locals import * 
pygame.init() 
screen = pygame.display.set_mode((500, 500), 0, 32) 
guy_sprite = pygame.image.load("guy.png") 
wall_sprite = pygame.image.load("wall.png") 

class guy_class(pygame.sprite.Sprite): 
    def __init__(self, surface): 
     self.surface = surface 
     self.x = 250 
     self.y = 250 
     self.vx = 0 
     self.vy = 0 
     self.sprite = guy_sprite 

    def event(self, event): 
     if event.type == pygame.K_UP: 
      self.vy = -1 
     elif event.type == pygame.K_DOWN: 
      self.vy = 1 
     elif event.type == pygame.K_LEFT: 
      self.vx = -1 
     elif event.type == pygame.K_RIGHT: 
      self.vx = 1 

    def move(self): 
     self.x += self.vx 
     self.y += self.vy 

    def draw(self, surface): 
     surface.blit(self.sprite, (int(self.x), int(self.y))) 

    def position(self): 
     return self.x, self.y 

class wall_class(pygame.sprite.Sprite): 
    def __init__(self, surface): 
     self.x = 100 
     self.y = 250 
     self.vx = 0 
     self.vy = 0 
     self.sprite = wall_sprite 

    def draw(self, surface): 
     surface.blit(self.sprite, (self.x, self.y)) 

def end_game(): 
    pygame.quit() 
    sys.exit() 

clock = pygame.time.Clock() 
guy = guy_class(screen) 
wall = wall_class(screen) 

while True: 
    screen.fill((0, 0, 0)) 
    guy.move() 
    guy.draw(screen) 

    for event in pygame.event.get(): 
     if event.type == QUIT: 
      end_game() 
     elif event.type == pygame.KEYDOWN: 
      guy.event(event) 

    clock.tick(100) 
    pygame.display.update() 

---

Answer 1

你的精灵是不动的原因是因为要检查的类型，而不是关键在人活动的功能。

所以改成这样：

def event(self, event): 
    if event.key == pygame.K_UP: 
     self.vy = -1 
    elif event.key == pygame.K_DOWN: 
     self.vy = 1 
    elif event.key == pygame.K_LEFT: 
     self.vx = -1 
    elif event.key == pygame.K_RIGHT: 
     self.vx = 1 

也应检查KEY_UP事件，让你的精灵将停止时，你会释放键。