到目前为止，我正在Python制作一个看起来像这样的游戏：
import pygame, sys, time, random, threading
from threading import Timer
from pygame.locals import *
pygame.init()
WINDOWHEIGHT = 720
WINDOWWIDTH = 1280
windowSurface = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT), 0, 32)
pygame.display.set_caption('Hitman Grandma')
plorp = 'true'
white = (255,255,255)
red = (255,0,0)
black = (0,0,0)
green = (0,255,0)
blue = (0,0,255)
cyan = (0,255,255)
windowSurface.fill(white)
pygame.display.update()
mainClock = pygame.time.Clock()
hgleft = False
hgright = False
hgup = False
speed = 4
hgair = True
hgjumpallowed = False
level = 0
def stop() :
hgbox.move_ip(0,0)
return
hgbox = pygame.Rect(0 ,13 ,36 ,72)
hitmangrandma = pygame.image.load('hgrd1copy.jpg')
hg = pygame.transform.scale(hitmangrandma, (36,72))
landbox1 = pygame.Rect(0,400,200,50)
li = pygame.image.load('hgland1.png')
land1 = pygame.transform.scale(li,(200,50))
landbox2 = pygame.Rect(230,400,200,50)
land2 = pygame.transform.scale(li,(200,50))
land = landbox1,landbox2
while True:
windowSurface.fill(white)
windowSurface.blit(land1,landbox1)
windowSurface.blit(land2,landbox2)
for event in pygame.event.get():
if event.type == KEYDOWN:
if event.key == K_LEFT or event.key == K_a:
hgright = False
hgleft = True
if event.key == K_RIGHT or event.key == K_d:
hgleft = False
hgright = True
if event.key == K_UP or event.key == K_w:
hgair = True
hgup = True
hgupkey = True
if event.type == KEYUP:
if event.key == K_ESCAPE or K_q and pygame.key.get_mods() & pygame.KMOD_CTRL:
pygame.quit()
sys.exit()
exit
if event.key == K_LEFT or K_a:
hgleft = False
if event.key == K_RIGHT or K_d:
hgright = False
if hgup and hgbox.top > 0 and hgupkey == True and hgair == True and hgjumpallowed == True:
hgbox.top -= 100
hgair = True
if hgleft and hgbox.left > 0:
hgbox.left -= speed
if hgright and hgbox.right < WINDOWWIDTH:
hgbox.right += speed
if not hgbox.colliderect(landbox1) or not hgbox.colliderect(landbox2) and hgair == True:
hgair = False
hgbox.top += speed
hgjumpallowed = False
if hgbox.colliderect(landbox1) or hgbox.colliderect(landbox2):
hgjumpallowed = True
stop()
windowSurface.blit(hg, hgbox)
pygame.display.update()
mainClock.tick(40)
然而，当我运行我的脚本时，hgbox没有检测到与landbox2的碰撞，只是一直在下降。我认为这个问题是由于它只运行if语句的第一部分，而不是检查其他部分。我应该怎么做才能检测到if语句的其他部分？
答案 0 :(得分：2)
要确保Python以正确的顺序评估逻辑运算符，请添加（）。
if (not hgbox.colliderect(landbox1) or not hgbox.colliderect(landbox2)) and hgair == True:
如果与landbox1或landbox2以及hgair == True没有发生冲突，则评估为True。
答案 1 :(得分：2)
使用mcve我的意思是这样的（我们可以复制，粘贴和运行的最小但完整的例子）：
import sys
import pygame
pygame.init()
screen = pygame.display.set_mode((640, 480))
def stop() :
hgbox.move_ip(0, 0)
hgbox = pygame.Rect(0 ,13 ,36 ,72)
landbox1 = pygame.Rect(0,400,200,50)
landbox2 = pygame.Rect(230,400,200,50)
hgair = True
hgjumpallowed = False
hgup = False
hgupkey = False
speed = 9
clock = pygame.time.Clock()
done = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_w:
hgup = True
hgbox.x += 50
hgbox.y -= 90
if hgup and hgbox.top > 0 and hgupkey == True and hgair == True and hgjumpallowed == True:
hgbox.top -= 100
hgair = True
if not hgbox.colliderect(landbox1) or not hgbox.colliderect(landbox2) and hgair == True:
hgair = False
hgbox.top += speed
hgjumpallowed = False
if hgbox.colliderect(landbox1) or hgbox.colliderect(landbox2):
hgjumpallowed = True
stop()
screen.fill(pygame.Color('gray12'))
pygame.draw.rect(screen, (120, 70, 70), landbox1)
pygame.draw.rect(screen, (120, 70, 70), landbox2)
pygame.draw.rect(screen, (50, 70, 170), hgbox)
pygame.display.flip()
clock.tick(30)
pygame.quit()
sys.exit()
问题是由这一行引起的：
if not hgbox.colliderect(landbox1) or not hgbox.colliderect(landbox2) and hgair == True:
评估为
if (not hgbox.colliderect(landbox1)) or (not hgbox.colliderect(landbox2) and hgair == True):
在上面的示例中，第二部分始终为False。 hgbox总是会掉落，除非条件的第一部分也为假(not hgbox.colliderect(landbox1))，这意味着它只能站在左侧平台上。
尝试将其更改为：
if not hgbox.colliderect(landbox1) and not hgbox.colliderect(landbox2):
# Move downwards.
编辑：这是一个完整的示例，向您展示如何编写移动和跳转代码。使用x_speed和y_speed每帧移动播放器（也加速y_speed），在事件循环中将速度设置为所需的值。如果玩家触摸平台，则将其设置为平台rect的.top和hgjumpallowed至True。
import pygame, sys
from pygame.locals import *
from pygame.color import THECOLORS
pygame.init()
windowSurface = pygame.display.set_mode((1280, 720), 0, 32)
pygame.display.update()
mainClock = pygame.time.Clock()
hitmangrandma = pygame.Surface((36, 72))
hitmangrandma.fill((250, 160, 50))
hgbox = hitmangrandma.get_rect(topleft=(10, 10))
y_speed = 0
x_speed = 0
hgjumpallowed = False
land_img = pygame.Surface((200, 50))
land_img.fill((50, 100, 250))
land = pygame.Rect(0,400,200,50), pygame.Rect(230,400,200,50)
done = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT: # Quit game by pressing on the "x" button.
done = True
if event.type == KEYDOWN:
if event.key in (K_LEFT, K_a):
# Just set the x_speed and then move
# the rect in the while loop each frame.
x_speed = -4
if event.key in (K_RIGHT, K_d):
x_speed = 4
if (event.key == K_UP or event.key == K_w) and hgjumpallowed:
y_speed = -17
hgjumpallowed = False
if event.type == KEYUP:
if event.key == K_ESCAPE or K_q and pygame.key.get_mods() & pygame.KMOD_CTRL:
done = True
if event.key in (K_LEFT, K_a):
x_speed = 0
if event.key in (K_RIGHT, K_d):
x_speed = 0
y_speed += 1 # Accelerate downwards.
# Move the player.
hgbox.x += x_speed
hgbox.y += y_speed
# Check if player is on ground and can jump.
hgjumpallowed = False
for box in land:
if hgbox.colliderect(box): # If player touches ground.
hgjumpallowed = True
hgbox.bottom = box.top
y_speed = 0
windowSurface.fill(THECOLORS['white'])
for box in land:
windowSurface.blit(land_img, box)
windowSurface.blit(hitmangrandma, hgbox)
pygame.display.update()
mainClock.tick(40)
pygame.quit()
sys.exit()
事件循环中也存在错误：event.key == K_RIGHT or K_d始终为True，因为它被评估为(event.key == K_RIGHT) or (K_d)而K_d是真值。