不同的移动精灵未在Pygame中显示

Question

我正在使用pygame在Python中制作一个小游戏，我正在尝试使我的角色在屏幕上的不同方向上移动，以响应用户按键盘上的方向箭头。角色移入的每个方向都有3个精灵，应连续显示。问题是，即使角色确实向上移动＆amp;根据我的说法，按下键盘箭头＆amp;向下。只有上UP箭头的精灵才能有效，如果我尝试向下移动角色，它确实会移动，但它停留在我向上移动时具有的先前的精灵状态（即根本没有显示下的精灵）。这很奇怪，因为UP＆amp;Down Sprites完全相同＆amp;然而，他们中只有一个在另一个上工作！我包括了我认为相关的代码部分，任何帮助都将不胜感激。

pygame.init()
screen = pygame.display.set_mode((900,70))
finished = False
x = 450 - 35/2
y = 650   #initial co-ordiantes of the player
backSprites = ["data/hero/walk-back1.png", "data/hero/walk-back2.png", "data/hero/stand-back.png"]
back_index = 0
backSpritesModified1 = [pygame.image.load(filename) for filename in backSprites]
backSpritesModified2 = [pygame.transform.scale((filename), (45, 50) for filename in backSpritesModified1]
backSpritesModified3 = [(filename).convert_alpha() for filename in backSpritesModified2]
#These previous lines work perfectly when the up button is pressed
frontSprites = ["data/hero/walk-front1.png", "data/hero/walk-front2.png", "data/hero/stand-front.png"]
front_index = 0
frontSpritesModified1 = [pygame.image.load(filename) for filename in frontSprites]
frontSpritesModified2 = [pygame.transform.scale((filename), (45, 50) for filename in frontSpritesModified1]
frontSpritesModified3 = [(filename).convert_alpha() for filename in frontSpritesModified2]
#as you can see it's written in the same syntax as the previous part but doesn,t work

代码的以下部分包含在一个时循环中，就像我说的那样，这是唯一的相关部分，所以我只包括它们

while finished == False #while the game isn't finished yet
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finished = True
    pressedKeys = pygame.key.get_pressed()
    if pressedKeys[pygame.K_UP] == 1:
        y -= 5
        back_index = (back_index + 1) %len(backSpritesModified3)
    if pressedKeys[pygame.K_DOWN] == 1:
        y += 5
        front_index = (front_index + 1) %len(frontSpritesModified3)
#not working even though it's the same syntax as the previous one!

Answer 1

这是一个没有图像的最低工作示例，但是您会在屏幕上看到文本，显示您正在播放什么动画以及它的框架。这应该可以帮助您了解如何基于实体状态的动画之间的切换。有很多方法可以做到这一点。另外，没有看到代码的其他部分，很难看到问题出在哪里。

import pygame
pygame.init()
screen = pygame.display.set_mode((800,600))
clock = pygame.time.Clock()
font = pygame.font.SysFont(pygame.font.get_default_font(), 25)
running = True;
anim_idle = ['idle-1']
anim_up = ['up-1', 'up-2', 'up-3']
anim_down = ['down-1', 'down-2', 'down-3']
anim_dict = {'up': anim_up, 'down': anim_down, 'idle': anim_idle}
anim_speed = 0.25# each frame of the animation lasts 1/4 of a second
current_anim_name = 'idle'
current_anim = anim_dict.get(current_anim_name)
current_anim_frame = 0
current_frame_time = 0
def change_anim(anim_name):
    global current_anim_name, current_anim, current_anim_frame, current_frame_time
    current_anim_name = anim_name
    current_anim = anim_dict.get(anim_name)
    current_anim_frame = 0
    current_frame_time = 0
while running:
    dt = clock.tick() * 0.001# delta time in seconds
    current_frame_time = current_frame_time + dt
    if current_frame_time >= anim_speed:
        current_anim_frame = (current_anim_frame + 1)%len(current_anim)
        current_frame_time = 0
    for event in pygame.event.get():
        print(event)
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False
            if event.key == pygame.K_UP:
                change_anim('up')
            elif event.key == pygame.K_DOWN:
                change_anim('down')
            elif event.key == pygame.K_LEFT:
                pass
            elif event.key == pygame.K_RIGHT:
                pass
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_UP:
                change_anim('idle')
            elif event.key == pygame.K_DOWN:
                change_anim('idle')
            elif event.key == pygame.K_LEFT:
                pass
            elif event.key == pygame.K_RIGHT:
                pass
    screen.fill((0,0,0))
    screen.blit(font.render(current_anim_name + ' :: frame ' + current_anim[current_anim_frame], True, (255,255,255)), (0,0))
    pygame.display.flip()
pygame.quit()