我正在使用python构建类似小行星的游戏，但是我遇到了问题，因为我保持在possibleTurrets数组的范围内。我正在做的就是遍历数组，当数组外的边缘情况出现时，我通过以下方式处理它们：
if currentTurPos > 8:
currentTurPos = 8
elif currentTurPos < 0:
currenTurPos = 0
这是对这个数组的引用：
possibleTurrets = [ (x-27,y-2),
(x-26,y-5),
(x-25,y-8),
(x-23,y-12),
(x-20,y-14),
(x-18,y-15),
(x-15,y-17),
(x-13,y-19),
(x-11,y-21)
]
出于某种原因，此代码在pygame.K_UP上正常工作，但在pygame.K_DOWN上却无效，我不明白为什么。
这似乎应该是非常明显的，但我花了一个小时试图修复它，并且画了一个空白。问题在于我的ufo函数和currentTurPos变量。
# Libraries
import pygame
import time
import random
import os
# Initialize Pygame
pygame.init()
# Colors
white = (255,255,255)
black = (0,0,0)
red = (200,0,0)
blue = (0,0,255)
green = (34,177,76)
light_green = (0,255,0)
yellow = (200,200,0)
light_yellow = (255,255,0)
light_red = (255,0,0)
# Display
display_width = 800
display_height = 600
gameDisplay = pygame.display.set_mode((display_width,display_height))
#pygame.display.set_caption('Slither')
#icon = pygame.image.load('apple.bmp')
#pygame.display.set_icon(icon)
clock = pygame.time.Clock()
# Sprites
ufoWidth = 40
ufoHeight = 20
turretWidth = 5
turretHeight = 10
fps = 15 # Speed
# Fonts
smallFont = pygame.font.SysFont("comicsansms", 25)
medFont = pygame.font.SysFont("comicsansms", 50)
largeFont = pygame.font.SysFont("comicsansms", 80)
def ufo(x,y,turPos):
x = int(x)
y = int(y)
possibleTurrets = [ (x-27,y-2),
(x-26,y-5),
(x-25,y-8),
(x-23,y-12),
(x-20,y-14),
(x-18,y-15),
(x-15,y-17),
(x-13,y-19),
(x-11,y-21)
]
pygame.draw.circle(gameDisplay, blue, (x,y),int(ufoHeight/2))
pygame.draw.ellipse(gameDisplay, black, (x-ufoHeight, y, ufoWidth, ufoHeight))
pygame.draw.line(gameDisplay,blue,(x,y),possibleTurrets[turPos],turretWidth)
# Font sizes
def text_objects(text, color, size):
if size == "small":
textSurface = smallFont.render(text, True, color)
elif size == "medium":
textSurface = medFont.render(text, True, color)
elif size == "large":
textSurface = largeFont.render(text, True, color)
return textSurface, textSurface.get_rect()
# Displays a message: Requires message, color, y-displacement, and size arguments
def message_to_screen(msg, color, y_displace=0, size="small"):
textSurf, textRect = text_objects(msg, color, size)
textRect.center = (int(display_width/2), (int(display_height/2) + y_displace))
gameDisplay.blit(textSurf, textRect)
# Show button text
def text_to_button(msg,color, buttonx,buttony,buttonwidth,buttonheight,size="small"):
textSurf, textRect = text_objects(msg,color,size)
textRect.center = ((buttonx+(buttonwidth/2)), buttony+(buttonheight/2))
gameDisplay.blit(textSurf, textRect)
# On button hover
def button(text,x,y,width,height,inactive_color,active_color,action):
cursor = pygame.mouse.get_pos()
click = pygame.mouse.get_pressed()
if x + width > cursor[0] > x and y + height > cursor[1] > y:
pygame.draw.rect(gameDisplay,active_color,(x,y,width,height))
if click[0] == 1 and action != None:
if action == "play":
gameLoop()
if action == "controls":
game_controls()
if action == "quit":
pygame.quit()
quit()
else:
pygame.draw.rect(gameDisplay,inactive_color,(x,y,width,height))
text_to_button(text,black,x,y,width,height)
def game_controls():
gcont = True
while gcont:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_c:
intro = False
if event.key == pygame.K_q:
pygame.quit()
quit()
gameDisplay.fill(white)
message_to_screen("Controls", green, -100, size="large")
message_to_screen("Fire: Spacebar", black, -30, size="small")
message_to_screen("Move turret: Up and Down arrows", black, 10, size="small")
message_to_screen("Move UFO: Left and Right arrows", black, 50, size="small")
message_to_screen("Pause: P", black, 90, size="small")
button("Play",150,450,100,50, green, light_green, action="play")
button("Quit",550,450,100,50, red, light_red, action="quit")
pygame.display.update()
clock.tick(fps)
# Pauses game and gives continue and quit options
def pause():
paused = True
message_to_screen("Paused", black, -100, size="large")
message_to_screen("Press P to play, or Q to quit.", black, 25, size="small")
while paused:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_p:
paused = False
elif event.key == pygame.K_q:
pygame.quit()
quit()
pygame.display.update()
clock.tick(fps)
# Keeps track of, and displays the score
def score(score):
text = smallFont.render(" Score: " + str(score), True, black)
gameDisplay.blit(text, [0,0])
# Barrier
def barrier():
xlocation = (display_width/2) + random.randint(-0.2*displayWidth,0.2*displayWidth)
# Intro screen - Title and directions
def game_intro():
intro = True
while intro:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_c:
intro = False
if event.key == pygame.K_q:
pygame.quit()
quit()
gameDisplay.fill(white)
message_to_screen("Welcome to UFO!", green, -100, size="large")
message_to_screen("The objective of the game is to search and destroy.", black, -30, size="small")
message_to_screen("Destroy your opponent before they destroy you.", black, 10, size="small")
message_to_screen("The more enemies you destroy, the harder they get.", black, 50, size="small")
button("Play",150,450,100,50, green, light_green, action="play")
button("Controls",350,450,100,50, yellow, light_yellow, action="controls")
button("Quit",550,450,100,50, red, light_red, action="quit")
pygame.display.update()
clock.tick(fps)
# Main game loop
def gameLoop():
gameExit = False
gameOver = False
mainUfoX = display_width * 0.9
mainUfoY = display_height * 0.9
ufoMove = 0
currentTurPos = 0
changeTur = 0
# Game over screen and changes for key inputs
while not gameExit:
if gameOver == True:
message_to_screen("Game over!", red, -50, size="large")
message_to_screen("Press C to play again, Q to quit.", black, 50, size="medium")
pygame.display.update()
while gameOver == True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
gameExit = True
gameOver = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
gameExit = True
gameOver = False
if event.key == pygame.K_c:
gameLoop()
# Make changes for specific key inputs
for event in pygame.event.get():
if event.type == pygame.QUIT:
gameExit = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
ufoMove = -5
elif event.key == pygame.K_RIGHT:
ufoMove = 5
elif event.key == pygame.K_UP:
changeTur = 1
elif event.key == pygame.K_DOWN:
changeTur = -1
elif event.key == pygame.K_p:
pause()
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
ufoMove = 0
if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
changeTur = 0
gameDisplay.fill(white)
mainUfoX += ufoMove
currentTurPos += changeTur
if currentTurPos > 8:
currentTurPos = 8
elif currentTurPos < 0:
currenTurPos = 0
ufo(mainUfoX,mainUfoY,currentTurPos)
pygame.display.update()
clock.tick(fps)
# Quits
pygame.quit()
quit()
# Loads game intro screen
game_intro()
# gameLoop calls itself to begin game
gameLoop()
答案 0 :(得分：0)
这是一个错字（我是个白痴）。
currentTurPos是currenTurPos。
获得的经验教训：带有重复字母的复杂变量名称很危险。