行走动画循环

Question

我已经创建了一个龙，它会向玩家移动，并在此过程中有一个飞行动画。但是，如果玩家站在某些角度与龙相对应的位置，飞行动画就会停止，直到它要么直接在玩家正上方/侧面，要么立即对角线移动。

例如，站在龙下方会触发动画，但是站在右下方会导致龙的动画暂停，直到它立即对角线移动。这里有一个完全可运行的例子;

主游戏

from Rooms import *
from Player import *
import pygame


BLACK = (0, 0, 0)
WHITE = (255, 255, 255)


pygame.init()

screen_width = 1080
screen_height = 607
screen = pygame.display.set_mode([screen_width, screen_height])

pygame.display.set_caption('Labyrinth')

block_list = pygame.sprite.Group()
all_sprites_list = pygame.sprite.Group()

rooms = []

room = Room0()
rooms.append(room)

current_room_no = 0
current_room = rooms[current_room_no]

player = Player("Isaac.png", 420, 150, current_room)
all_sprites_list.add(player)


clock = pygame.time.Clock()


done = False


# -- MAIN PROGRAM LOOP -- #

# -- Event processing --

while not done:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True


# Player controls

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player.changespeed(-7, 0)
            elif event.key == pygame.K_RIGHT:
                player.changespeed(7, 0)
            elif event.key == pygame.K_UP:
                player.changespeed(0, -7)
            elif event.key == pygame.K_DOWN:
                player.changespeed(0, 7)

        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                player.changespeed(7, 0)
            elif event.key == pygame.K_RIGHT:
                player.changespeed(-7, 0)
            elif event.key == pygame.K_UP:
                player.changespeed(0, 7)
            elif event.key == pygame.K_DOWN:
                player.changespeed(0, -7)

# -- Game Logic --

    all_sprites_list.update()
    current_room.enemy_sprites.update(player)

# Hit detection 

    screen.blit(current_room.background_image, current_room.background_position)

    all_sprites_list.draw(screen)
    current_room.enemy_sprites.draw(screen)


    pygame.display.flip()

    clock.tick(60)

pygame.quit()

Dragon class

import pygame
import math
from Player import Player
import time

BLACK = (0, 0, 0)

class SpriteSheet(object):

    def __init__(self, file_name):

        self.sprite_sheet = pygame.image.load(file_name).convert()


    def get_image(self, x, y, width, height):

        image = pygame.Surface([width, height]).convert()
        image.blit(self.sprite_sheet, (0, 0), (x, y, width, height))
        image.set_colorkey(BLACK)

        return image


class Dragon(pygame.sprite.Sprite):

    def __init__(self, x, y):

        super().__init__()

        self.flying_frames_l = []
        self.flying_frames_r = []

        sprite_sheet = SpriteSheet("Dragon.png")

# Flying left
        image = sprite_sheet.get_image(12, 22, 95, 85)
        self.flying_frames_l.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        self.flying_frames_l.append(image)
        image = sprite_sheet.get_image(18, 138, 96, 55)
        self.flying_frames_l.append(image)
        image = sprite_sheet.get_image(128, 131, 96, 63)
        self.flying_frames_l.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        self.flying_frames_l.append(image)
        image = sprite_sheet.get_image(12, 22, 95, 85)
        self.flying_frames_l.append(image)

# Flying right
        image = sprite_sheet.get_image(12, 22, 95, 85)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)
        image = sprite_sheet.get_image(18, 138, 96, 55)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)
        image = sprite_sheet.get_image(128, 131, 96, 63)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)
        image = sprite_sheet.get_image(12, 22, 95, 85)
        image = pygame.transform.flip(image, True, False)
        self.flying_frames_r.append(image)


        self.image = self.flying_frames_r[0]
        self.rect = self.image.get_rect()
        self.rect.y = y
        self.rect.x = x

        self.speedx = 0
        self.speedy = 0

        self.health = 100


    def update(self, player):

        posx = self.rect.x
        posy = self.rect.y

        dx = self.rect.x - player.rect.x
        dy = self.rect.y - player.rect.y

        dist = math.hypot(dx, dy)

        dx = dx / dist
        dy = dy / dist

        if dx > 0:
            self.speedx = -1.5

        if dx <= 0:
            self.speedx = -1.5          

        if dy >= 0:
            self.speedy = -1.5

        if dy <= 0:
            self.speedy = -1.5


        self.rect.x += dx * self.speedx
        self.rect.y += dy * self.speedy


        if self.rect.x < player.rect.x:
            frame = (posx // 10) % len(self.flying_frames_l)
            self.image = self.flying_frames_l[frame]
        else:
            frame = (posx // 10) % len(self.flying_frames_r)
            self.image = self.flying_frames_r[frame]

        if self.rect.y < player.rect.y:
            frame = (posy // 10) % len(self.flying_frames_l)
            self.image = self.flying_frames_l[frame]
        else:
            frame = (posy // 10) % len(self.flying_frames_r)
            self.image = self.flying_frames_r[frame]

玩家类

import pygame


BLACK = (0, 0, 0)
WHITE = (255, 255, 255)


class Player(pygame.sprite.Sprite):


    def __init__(self, filename, x, y, current_room):

        super().__init__()

        self.image = pygame.image.load(filename).convert()
        self.image.set_colorkey(BLACK)

        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

        self.change_x = 0
        self.change_y = 0

    def changespeed(self, x, y):
        self.change_x += x
        self.change_y += y

    def update(self):
        self.rect.x += self.change_x
        self.rect.y += self.change_y

Room class

import Player
import pygame
from Enemies import Dragon


class Room(object):
    enemy_sprites = None

    def __init__(self):
        self.enemy_sprites = pygame.sprite.Group()


class Room0(Room):
    def __init__(self):
        super().__init__()

        enemy = Dragon(380, 280)
        self.enemy_sprites.add(enemy)

        self.background_position = [0, 0]
        self.background_image = pygame.image.load("Floor.png").convert()

这是我正在使用的雪碧图，以便更轻松地运行代码。

- Goose _

---

程序有错误吗？难道不是“ZeroDivisionError”吗？ - Azhy

哦，对不起，由于碰撞检测我忘记在示例代码中考虑到这一点，所以它并没有出现在完整代码中！ - Goose _

Answer 1

除了Azhy已经指出的ZeroDivisionError之外，你的问题在于你通过除以一个常量来计算动画的当前图像。posy不变时，图像也不会改变。

你可以在update结束时打印frame以查看它自己。

---

你可以将处理动画提取到自己的类或其他东西中，这里是一个简单的示例:

class Animation(object):
    def __init__(self, sprite, speed, images):
        self.sprite = sprite
        self.images = images
        self.speed = speed
        self.step = 0
        self.frame = 0

    def update(self):
        self.step += 1
        if self.step >= self.speed:
            self.frame = (self.frame + 1) % len(self.images)
            self.sprite.image = self.images[self.frame]
            self.step = 0

然后Dragon类可能看起来像这样：

class Dragon(pygame.sprite.Sprite):

    def __init__(self, x, y):

        super().__init__()

        flying_frames_l = []
        flying_frames_r = []

        sprite_sheet = SpriteSheet("Dragon.png")

# Flying left
        image = sprite_sheet.get_image(12, 22, 95, 85)
        flying_frames_l.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        flying_frames_l.append(image)
        image = sprite_sheet.get_image(18, 138, 96, 55)
        flying_frames_l.append(image)
        image = sprite_sheet.get_image(128, 131, 96, 63)
        flying_frames_l.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        flying_frames_l.append(image)
        image = sprite_sheet.get_image(12, 22, 95, 85)
        flying_frames_l.append(image)
        self.flying_left = Animation(self, 6, flying_frames_l)

# Flying right
        image = sprite_sheet.get_image(12, 22, 95, 85)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        image = sprite_sheet.get_image(18, 138, 96, 55)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        image = sprite_sheet.get_image(128, 131, 96, 63)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        image = sprite_sheet.get_image(140, 35, 95, 67)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        image = sprite_sheet.get_image(12, 22, 95, 85)
        image = pygame.transform.flip(image, True, False)
        flying_frames_r.append(image)
        self.flying_right = Animation(self, 6, flying_frames_r)

        self.image = flying_frames_r[0]
        self.rect = self.image.get_rect()
        self.rect.y = y
        self.rect.x = x

        self.speedx = 0
        self.speedy = 0

        self.health = 100
        self.animation = self.flying_right

    def update(self, player):

        posx = self.rect.x
        posy = self.rect.y

        dx = self.rect.x - player.rect.x
        dy = self.rect.y - player.rect.y

        dist = math.hypot(dx, dy)

        if dist > 0:
            dx = dx / dist
            dy = dy / dist

        if dx > 0:
            self.speedx = -1.5
            self.animation = self.flying_left

        if dx <= 0:
            self.speedx = -1.5          
            self.animation = self.flying_right

        if dy >= 0:
            self.speedy = -1.5

        if dy <= 0:
            self.speedy = -1.5


        self.rect.x += dx * self.speedx
        self.rect.y += dy * self.speedy


        self.animation.update()

请注意我们只是简单地增加一个计数器，以查看是否应更改图像，而不是依赖于当前位置。

- sloth

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啊，是的，那很有道理，非常感谢你的帮助！ - Goose _