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RANDOM PACMAN 任务是为 5 个对象（pac man 和 4 个随机移动的幽灵）设置动画，如果 pac man 与一个幽灵碰撞，他会从它身上弹开，幽灵会相互穿过，并且在被 pac man 击中时不受影响。当鼠标单击模式更改，如果 pac man 发生碰撞并且 pac man 不受影响，则幽灵会反弹，如果再次单击鼠标，它将恢复到原始模式。函数 ghost_collision 和 mode_swich 处理这个问题，最后我有一个 if 语句鼠标点击。BUG1我不知道为什么当精灵碰撞时它们有时会变得不动（在两种模式下）。我是否可以用列表和 for 循环替换一些重复的 if 语句？如果是这样怎么办？我尝试制作所有 ghost_boundary 变量的列表，然后使用 

 For sprite in sprite_list():        
    sprite.left < 0 or sprite.right > WIDTH:
    sprite_velocity[1] = -1 * sprite_velocity[1]

那失败了。

import pygame
from random import *



pygame.init()

def ghost_collision():
   # global pacman_up, pacman_right, pacman_velocity why?
    SCREAM.play()
    pacman_velocity[0] = randint(-1,1)
    pacman_velocity[1] = randint(-1,1)
   if pacman_velocity[0] < 0:
        pacman = pygame.image.load(PACMAN_LEFT).convert()
    elif pacman_velocity[0] > 0:
        pacman = pygame.image.load(PACMAN_RIGHT).convert()
    return pacman_velocity

def mode_switch():
    global mode
    blue_right, orange_right, pink_right,\
          red_right, blue, orange, pink, red
    if mode == False:
        mode = True
        blue = pygame.image.load(GHOST_SCARED).convert()
        orange = pygame.image.load(GHOST_SCARED).convert()
        pink = pygame.image.load(GHOST_SCARED).convert()
        red = pygame.image.load(GHOST_SCARED).convert()
    else:
        mode = False
        if blue_right == True:
            blue = pygame.image.load(BLUE_LEFT).convert()
            blue_right = False
    else:
        blue = pygame.image.load(BLUE_RIGHT).convert()
        blue_right = True
    if orange_right == True:
        orange = pygame.image.load(ORANGE_LEFT).convert()
        orange_right = False
    else:
        orange = pygame.image.load(ORANGE_RIGHT).convert()
        orange_right = True
    if pink_right == True:
        pink = pygame.image.load(PINK_LEFT).convert()
        pink_right = False
    else:
        pink = pygame.image.load(PINK_RIGHT).convert()
        pink_right = True
    if red_right == True:
        red = pygame.image.load(RED_LEFT).convert()
        red_right = False
    else:
        red = pygame.image.load(RED_RIGHT).convert()
        red_right = True


PACMAN_LEFT = 'pacman-left.png'#import all necessary images and sounds
PACMAN_RIGHT = 'pacman-right.png'
BLUE_LEFT = 'blue-left.png'
BLUE_RIGHT = 'blue-right.png'
ORANGE_LEFT = 'orange-left.png'
ORANGE_RIGHT = 'orange-right.png'
PINK_LEFT = 'pink-left.png'
PINK_RIGHT = 'pink-right.png'
RED_LEFT = 'red-left.png'
RED_RIGHT = 'red-right.png'
GHOST_SCARED = 'vulnerable.png'
BOUNCE_SOUND = 'Thump.wav'
SCREAM_SOUND = 'pacman_death.wav'
GHOST_WAIL = 'pacman_eatfruit.wav'
SOUND = pygame.mixer.Sound(BOUNCE_SOUND)
SCREAM = pygame.mixer.Sound(SCREAM_SOUND)
WAIL = pygame.mixer.Sound(GHOST_WAIL)
WIDTH = 800
HEIGHT = 600
BACKGROUND_COLOUR = 0, 0, 0
CAPTION = 'Random Pacman'
pacman_up = True#define image direction controlling variables
pacman_right = True
blue_right = False
orange_right = True
pink_right = False
red_right = True
mode = False

frame = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption(CAPTION)
pacman = pygame.image.load(PACMAN_RIGHT).convert()#create sprites and define boundaries
pacman_boundary = pacman.get_rect(center = (300,300))
pacman_velocity = [1, 1]
blue = pygame.image.load(BLUE_LEFT).convert()
blue_boundary = pacman.get_rect(center = (300,300))
blue_velocity = [-1, -1]
orange = pygame.image.load(ORANGE_RIGHT).convert()
orange_boundary = pacman.get_rect(center = (300,300))
orange_velocity = [1, -1]
pink = pygame.image.load(PINK_LEFT).convert()
pink_boundary = pacman.get_rect(center = (300,300))
pink_velocity = [-1, 1]
red = pygame.image.load(RED_RIGHT).convert()
red_boundary = pacman.get_rect(center = (300,300))
red_velocity = [1, 1]

finished = False
while not finished:
    pygame.event.pump()
        for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finished = True
        if event.type == pygame.MOUSEBUTTONUP:
            mode_switch()

    #####################################################

if pacman_boundary.left < 0 or pacman_boundary.right > WIDTH:#pacman bounce code
    SOUND.play()
    pacman_velocity[0] = -1 * pacman_velocity[0]
    if pacman_velocity[0] < 0:
        pacman = pygame.image.load(PACMAN_LEFT).convert()
    elif pacman_velocity[0] > 0:
        pacman = pygame.image.load(PACMAN_RIGHT).convert()
    pacman_velocity[1] = randint(-1,1)

if pacman_boundary.top < 0 or pacman_boundary.bottom > HEIGHT:
    SOUND.play()
    pacman_velocity[1] = -1 * pacman_velocity[1]

if mode == False:        
    if pacman_boundary.colliderect(blue_boundary)\
       or pacman_boundary.colliderect(orange_boundary)\
       or pacman_boundary.colliderect(pink_boundary)\
       or pacman_boundary.colliderect(red_boundary):
        ghost_collision()

    #####################################################

if blue_boundary.left < 0 or blue_boundary.right > WIDTH:#blue bounce code
    blue_velocity[0] = -1 * blue_velocity[0]
    if mode == False:
        if blue_right == True:
            blue = pygame.image.load(BLUE_LEFT).convert()
            blue_right = False
        else:
            blue = pygame.image.load(BLUE_RIGHT).convert()
            blue_right = True

if blue_boundary.top < 0 or blue_boundary.bottom > HEIGHT:
    SOUND.play()
    blue_velocity[1] = -1 * blue_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(blue_boundary):

        blue_velocity[0] = randint(-1,1)
        blue_velocity[1] = randint(-1,1)
        WAIL.play()


#####################################################

if orange_boundary.left < 0 or orange_boundary.right > WIDTH:#orange bounce code
    orange_velocity[0] = -1 * orange_velocity[0]
    if mode == False:
        if orange_right == True:
            orange = pygame.image.load(ORANGE_LEFT).convert()
            orange_right = False
        else:
            orange = pygame.image.load(ORANGE_RIGHT).convert()
            orange_right = True

if orange_boundary.top < 0 or orange_boundary.bottom > HEIGHT:
    SOUND.play()
    orange_velocity[1] = -1 * orange_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(orange_boundary):
        orange_velocity[0] = randint(-1,1)
        orange_velocity[1] = randint(-1,1)
        WAIL.play()

#####################################################

if pink_boundary.left < 0 or pink_boundary.right > WIDTH:#pink bounce code
    pink_velocity[0] = -1 * pink_velocity[0]
    if mode == False:
        if pink_right == True:
            pink = pygame.image.load(PINK_LEFT).convert()
            pink_right = False
        else:
            pink = pygame.image.load(PINK_RIGHT).convert()
            pink_right = True

if pink_boundary.top < 0 or pink_boundary.bottom > HEIGHT:
    SOUND.play()
    pink_velocity[1] = -1 * pink_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(pink_boundary):
        pink_velocity[0] = randint(-1,1)
        pink_velocity[1] = randint(-1,1)
        WAIL.play()

#####################################################

if red_boundary.left < 0 or red_boundary.right > WIDTH:#red bounce code
    red_velocity[0] = -1 * red_velocity[0]
    if mode == False:
        if red_right == True:
            red = pygame.image.load(RED_LEFT).convert()
            red_right = False
        else:
            red = pygame.image.load(RED_RIGHT).convert()
            red_right = True

if red_boundary.top < 0 or red_boundary.bottom > HEIGHT:
    SOUND.play()
    red_velocity[1] = -1 * red_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(red_boundary):
        red_velocity[0] = randint(-1,1)
        red_velocity[1] = randint(-1,1)
        WAIL.play()

#####################################################



pacman_boundary = pacman_boundary.move(pacman_velocity)
blue_boundary = blue_boundary.move(blue_velocity)
orange_boundary = orange_boundary.move(orange_velocity)
pink_boundary = pink_boundary.move(pink_velocity)
red_boundary = red_boundary.move(red_velocity)
frame.fill(BACKGROUND_COLOUR)
frame.blit(pacman, pacman_boundary)
frame.blit(blue, blue_boundary)
frame.blit(orange, orange_boundary)
frame.blit(pink, pink_boundary)
frame.blit(red, red_boundary)
pygame.display.flip()

pygame.quit()
4

1 回答 1

0

精灵在碰撞后有时会变得不动的原因是这里的代码：

pacman_velocity[0] = randint(-1,1)
pacman_velocity[1] = randint(-1,1)

该范围的 randint 意味着您获得的整数值是 -1、0 或 1。
来自文档：( http://docs.python.org/2/library/random.html )

random.randint(a, b)
Return a random integer N such that a <= N <= b

这意味着（理论上）每次发生碰撞时，速度的 x 分量有 1/3 的机会为 0，速度的 y 分量有 1/3 的机会为零。如果您只想选择 1 或 -1，请尝试 random.choice() 函数：

pacman_velocity[0] = random.choice((-1, 1))
pacman_velocity[1] = random.choice((-1, 1))

如果您想将 0 作为一种可能性包括在内，但又想降低其频率，您可以通过以下方式实现：

pacman_velocity[0] = random.choice((-1, -1, -1, 0, 1, 1, 1))
pacman_velocity[0] = random.choice((-1, -1, -1, 0, 1, 1, 1))

您尝试过的这个循环的问题：

For sprite in sprite_list():        
    sprite.left < 0 or sprite.right > WIDTH:
    sprite_velocity[1] = -1 * sprite_velocity[1]

是您正在检查精灵是否已通过屏幕的左边界或右边界，但是您不是反转精灵速度的 x 分量，而是反转速度的 y 分量。此外，您没有if在条件的开头。试试这个：

For sprite in sprite_list:
    if sprite.left < 0 or sprite.right > WIDTH:
       sprite_velocity[0] = -1 * sprite_velocity[0]
    if sprite.top < 0 or sprite.bottom > HEIGHT:
        sprite_velocity[1] = -1 * sprite_velocity[1]
于 2013-04-12T14:55:07.543 回答