按住键使角色保持移动

Question

我正在尝试制作一个快速动画，如果按住某个键，角色将继续移动，但我的代码似乎没有这样做。我按了键并移动了一次，但没有进一步移动。任何帮助解决这个问题。任何其他建议都表示赞赏，请记住，这并不接近最终产品形式。

import pygame
import os
import sys
from pygame.locals import *


pygame.init()
WIN = pygame.display.set_mode(display)
pygame.display.set_caption('The Game')
width = 500
height = 500
display = (width, height)
WHITE = (255, 255, 255)

left = [
pygame.image.load(os.path.join('assets', 'main', 'left_walk1.png')),
pygame.image.load(os.path.join('assets', 'main', 'left_walk2.png'))
]

right = [
pygame.image.load(os.path.join('assets', 'main', 'right_walk1.png')),
pygame.image.load(os.path.join('assets', 'main', 'right_walk2.png'))
]

up = [
pygame.image.load(os.path.join('assets', 'main', 'up_walk1.png')),
pygame.image.load(os.path.join('assets', 'main', 'up_walk2.png'))
]

down = [
pygame.image.load(os.path.join('assets', 'main', 'down_walk1.png')),
pygame.image.load(os.path.join('assets', 'main', 'down_walk2.png'))
]

standing_left = (os.path.join('assets', 'main', 'down_walk2.png'))
standing_right = (os.path.join('assets', 'main', 'down_walk2.png'))
standing_up = (os.path.join('assets', 'main', 'down_walk2.png'))
standing_down = (os.path.join('assets', 'main', 'down_walk2.png'))




class Player:
  def __init__(self, x, y):

      self.x = x
      self.y = y
      self.health = 100
      self.inv = []
      self.left = False
      self.right = False
      self.up = False
      self.down = False
      self.walking_count = 0

      self.facing = 'down'

  def draw_player(self, win):

      if self.walking_count == 3:
          self.walking_count = 1

      if self.left:
          WIN.blit(left[self.walking_count // 2], (self.x, self.y))

      elif self.right:
          WIN.blit(right[self.walking_count // 2], (self.x, self.y))

player = Player(100, 100)

FPS = 40
fpsClock = pygame.time.Clock()

while True:
  fpsClock.tick(FPS)
  WIN.fill(WHITE)
  player.draw_player(WIN)

  for event in pygame.event.get():
      if event.type == QUIT:
          pygame.quit()
          sys.exit()
      elif event.type == KEYDOWN:
          if event.key == K_UP and player.y <= 0:
              player.up = True
          elif event.key == K_DOWN:
              player.down = True
          elif event.key == K_LEFT:
              player.left = True
          elif event.key == K_RIGHT:
              player.right = True
      elif event.type == KEYUP:
          if event.key == K_UP:
              player.up = False
          if event.key == K_DOWN:
              player.down = False
          if event.key == K_LEFT:
              player.left = False
          if event.key == K_RIGHT:
              player.right = False

      if player.left:
          player.x -= 5
          player.walking_count += 1
      if player.right:
          player.x += 5
          player.walking_count += 1
      if player.up:
          player.y -= 5
          player.walking_count += 1
      if player.down:
          player.y += 5
          player.walking_count += 1


  pygame.display.update()

Answer 1

这是Indentation 的问题。您必须在应用程序循环而不是事件循环中应用移动：

while True:
    fpsClock.tick(FPS)
    WIN.fill(WHITE)
    player.draw_player(WIN)

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == KEYDOWN:
            if event.key == K_UP and player.y <= 0:
                player.up = True
            elif event.key == K_DOWN:
                player.down = True
            elif event.key == K_LEFT:
                player.left = True
            elif event.key == K_RIGHT:
                player.right = True
        elif event.type == KEYUP:
            if event.key == K_UP:
                player.up = False
            if event.key == K_DOWN:
                player.down = False
            if event.key == K_LEFT:
                player.left = False
            if event.key == K_RIGHT:
                player.right = False

    #<--| INDENTATION
    if player.left:
        player.x -= 5
    if player.right:
        player.x += 5
    if player.up:
        player.y -= 5
    if player.down:
        player.y += 5

    pygame.display.update()

---

您也可以使用pygame.key.get_pressed() 而不是KEYDOWN 和KEYUP 事件：

while True:
    fpsClock.tick(FPS)
    WIN.fill(WHITE)
    player.draw_player(WIN)

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    keys = pygame.key.get_pressed()
    player.left, player.right, player.up, player.down = False, False, False, False
    if keys[K_LEFT]:
        player.x -= 5
        player.left = True
    if keys[K_RIGHT]:
        player.x += 5
        player.right = True
    if keys[K_UP]:
        player.y -= 5
        player.up = True
    if keys[K_DOWN]:
        player.y += 5
        player.down = True

    pygame.display.update()

---

要控制动画速度，请添加属性self.animation_frames = 10。此属性控制动画的每个图像显示多少帧。根据属性计算图像索引。
walking_count 必须在 Player.draw_player 中递增，而不是在应用程序循环中递增。
为确保显示正确的“站立”图像，您必须添加属性self.standing。在draw_player 中设置依赖于当前方向的属性。如果玩家没有移动，则显示当前站立的图像：

class Player:
    def __init__(self, x, y):
        # [...]

        self.animation_frames = 10
        self.standing = standing_left

    def draw_player(self, win):

        # get image list
        if self.left:
            image_list = left
            self.standing = standing_left
        else self.right:
            image_list = right
            self.standing = standing_right
        else:
            image_list = [self.standing]

        # increment walk count and get image list
        image_index = self.walking_count // self.animation_frames
        if image_index >= len(image_list):
            image_index = 0
            self.walking_count = 0
        self.walking_count += 1

        WIN.blit(image_list[image_index], (self.x, self.y))