我的背景在 pygame 中淡化后如何保持相同的背景颜色？
How do i keep the same background color after my background fades in pygame?
我是初学者，我正在制作一个需要背景淡出的游戏。我写的程序使背景变淡，但它不会保持它刚刚淡化成的颜色，因为它会在一段时间后跳回原来的颜色。我希望它还保持它在特定时间淡出的颜色，例如我希望程序在进入游戏的时间为 20,000 毫秒时淡入淡出，而不是按下 MOUSEBUTTONDOWN 键，这就是为什么我写了 'print(pygame.time.get_ticks()) 但是我用起来有问题，如果有其他方法，请评论给我看看。谢谢！
import pygame
import time
pygame.init()
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
FPS = 60
#colors
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
def fade(width, height):
fade = pygame.Surface((width, height))
fade.fill((31,97,141))
for alpha in range(0, 300):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
pygame.display.update()
print(pygame.time.get_ticks())
screen.fill((31,97,141))
running = True
while running:
screen.fill(SKY_BLUE)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
要使背景淡出并保持它，您需要创建一个可供淡入淡出功能和主循环访问的共享表面。主要检查计数器和 运行 淡入淡出过程。这将暂停淡入淡出的主循环。 fade完成后查看fade surface变量，如果设置了就blit。
这是更新后的代码：
fade = None # before fade process
def dofade(width, height):
global fade # share variable with main loop
fade = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
fade.fill((31,97,141))
for alpha in range(0, 300):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
pygame.display.update()
#print(pygame.time.get_ticks())
clock.tick(FPS)
#screen.fill((31,97,141))
running = True
while running:
screen.fill(SKY_BLUE) # initial color
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN: # can start fade early
dofade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
tks = pygame.time.get_ticks()
if (tks >= 20000 and not fade): # if hit counter and fade not processed yet
dofade(DISPLAY_WIDTH, DISPLAY_HEIGHT) # loop paused for fade process
if fade: # if fade process done
screen.blit(fade, (0,0)) # always show fade surface
clock.tick(FPS)
pygame.display.update()
只需将新颜色分配给变量SKY_BLUE，它将一直使用它
def fade(width, height):
global SKY_BLUE
# ... your code ...
print('after fade')
SKY_BLUE = (31,97,141)
我的版本有其他改动
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global SKY_BLUE
fade = pygame.Surface((width, height))
fade.fill((31,97,141))
for alpha in range(0, 256):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
SKY_BLUE = (31,97,141)
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
running = True
while running:
screen.fill(SKY_BLUE)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
同样的方法你也可以使用surface。
首先使用带颜色的表面SKY_BLUE
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
running = True
while running:
screen.blit(background, (0,0))
褪色后替换它
def fade(width, height):
global background
# ... code ...
print('after fade')
background = fade
顺便说一句： 在这个地方最好为表面 fade 和函数 fade() 使用不同的名称，因为这会误导我。
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
至于 20 000 毫秒后的褪色，您可以使用 pygame.time.get_ticks() 获取当前时间并计算何时开始褪色（start_fading），稍后在循环中再次获取当前时间并与 start_fading 开始褪色。
可能需要布尔变量 (True/False) 才能在第一次褪色后不再执行此操作。
current_time = pygame.time.get_ticks()
start_fading = current_time + 20000
faded = False
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
#elif event.type == pygame.MOUSEBUTTONDOWN:
# fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
current_time = pygame.time.get_ticks()
if not faded and current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
faded = True
clock.tick(FPS)
pygame.display.update()
如果你想重复淡入淡出那么不要使用faded但在淡入淡出后使用start_fading
if current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
start_fading = current_time + 20000
如果你想要更多的元素延迟运行，那么你可以将它们保留在列表中并使用 for-loop 并且在 运行 一些函数之后你可以将它们从这个列表中删除。但是我这里不会用到。
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
current_time = pygame.time.get_ticks()
start_fading = current_time + 20000
faded = False
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
#elif event.type == pygame.MOUSEBUTTONDOWN:
# fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
current_time = pygame.time.get_ticks()
if not faded and current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
faded = True
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
还有其他方法 - 您可以使用 pygame.time.set_timer() 和 pygame.USEREVENT 来生成带有一些延迟的自定义事件
FADE_EVENT = pygame.USEREVENT
pygame.time.set_timer(FADE_EVENT, 2000)
然后你可以使用for event in pygame.event.get():捕获它并执行fade()
if event.type == FADE_EVENT:
pygame.time.set_timer(FADE_EVENT, 0) # turn off after one use
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
#FADE_EVENT = pygame.event.custom_type() # PyGame 2.0
FADE_EVENT = pygame.USEREVENT # PyGame 1.9
#pygame.time.set_timer(FADE_EVENT, 2000, True) # PyGame 2.0 # `once=True` - turn off after one use
pygame.time.set_timer(FADE_EVENT, 2000) # PyGame 1.9 # doesn't have `once`, it will need `set_timer(..., 0)`
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == FADE_EVENT:
pygame.time.set_timer(FADE_EVENT, 0) # PyGame 1.9 # turn off after one use
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
我是初学者，我正在制作一个需要背景淡出的游戏。我写的程序使背景变淡，但它不会保持它刚刚淡化成的颜色，因为它会在一段时间后跳回原来的颜色。我希望它还保持它在特定时间淡出的颜色，例如我希望程序在进入游戏的时间为 20,000 毫秒时淡入淡出，而不是按下 MOUSEBUTTONDOWN 键，这就是为什么我写了 'print(pygame.time.get_ticks()) 但是我用起来有问题，如果有其他方法，请评论给我看看。谢谢！
import pygame
import time
pygame.init()
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
FPS = 60
#colors
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
def fade(width, height):
fade = pygame.Surface((width, height))
fade.fill((31,97,141))
for alpha in range(0, 300):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
pygame.display.update()
print(pygame.time.get_ticks())
screen.fill((31,97,141))
running = True
while running:
screen.fill(SKY_BLUE)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
要使背景淡出并保持它，您需要创建一个可供淡入淡出功能和主循环访问的共享表面。主要检查计数器和 运行 淡入淡出过程。这将暂停淡入淡出的主循环。 fade完成后查看fade surface变量，如果设置了就blit。
这是更新后的代码：
fade = None # before fade process
def dofade(width, height):
global fade # share variable with main loop
fade = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
fade.fill((31,97,141))
for alpha in range(0, 300):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
pygame.display.update()
#print(pygame.time.get_ticks())
clock.tick(FPS)
#screen.fill((31,97,141))
running = True
while running:
screen.fill(SKY_BLUE) # initial color
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN: # can start fade early
dofade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
tks = pygame.time.get_ticks()
if (tks >= 20000 and not fade): # if hit counter and fade not processed yet
dofade(DISPLAY_WIDTH, DISPLAY_HEIGHT) # loop paused for fade process
if fade: # if fade process done
screen.blit(fade, (0,0)) # always show fade surface
clock.tick(FPS)
pygame.display.update()
只需将新颜色分配给变量SKY_BLUE，它将一直使用它
def fade(width, height):
global SKY_BLUE
# ... your code ...
print('after fade')
SKY_BLUE = (31,97,141)
我的版本有其他改动
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global SKY_BLUE
fade = pygame.Surface((width, height))
fade.fill((31,97,141))
for alpha in range(0, 256):
fade.set_alpha(alpha)
screen.blit(fade, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
SKY_BLUE = (31,97,141)
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
running = True
while running:
screen.fill(SKY_BLUE)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
同样的方法你也可以使用surface。
首先使用带颜色的表面SKY_BLUE
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
running = True
while running:
screen.blit(background, (0,0))
褪色后替换它
def fade(width, height):
global background
# ... code ...
print('after fade')
background = fade
顺便说一句： 在这个地方最好为表面 fade 和函数 fade() 使用不同的名称，因为这会误导我。
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.MOUSEBUTTONDOWN:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
至于 20 000 毫秒后的褪色，您可以使用 pygame.time.get_ticks() 获取当前时间并计算何时开始褪色（start_fading），稍后在循环中再次获取当前时间并与 start_fading 开始褪色。
可能需要布尔变量 (True/False) 才能在第一次褪色后不再执行此操作。
current_time = pygame.time.get_ticks()
start_fading = current_time + 20000
faded = False
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
#elif event.type == pygame.MOUSEBUTTONDOWN:
# fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
current_time = pygame.time.get_ticks()
if not faded and current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
faded = True
clock.tick(FPS)
pygame.display.update()
如果你想重复淡入淡出那么不要使用faded但在淡入淡出后使用start_fading
if current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
start_fading = current_time + 20000
如果你想要更多的元素延迟运行，那么你可以将它们保留在列表中并使用 for-loop 并且在 运行 一些函数之后你可以将它们从这个列表中删除。但是我这里不会用到。
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
current_time = pygame.time.get_ticks()
start_fading = current_time + 20000
faded = False
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
#elif event.type == pygame.MOUSEBUTTONDOWN:
# fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
current_time = pygame.time.get_ticks()
if not faded and current_time >= start_fading:
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
faded = True
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()
还有其他方法 - 您可以使用 pygame.time.set_timer() 和 pygame.USEREVENT 来生成带有一些延迟的自定义事件
FADE_EVENT = pygame.USEREVENT
pygame.time.set_timer(FADE_EVENT, 2000)
然后你可以使用for event in pygame.event.get():捕获它并执行fade()
if event.type == FADE_EVENT:
pygame.time.set_timer(FADE_EVENT, 0) # turn off after one use
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
import pygame
# --- constants ---
DISPLAY_HEIGHT = 700
DISPLAY_WIDTH = 900
WHITE = (255,255,255)
BLACK = (0,0,0)
SKY_BLUE = (102,178,255)
FPS = 60
# --- functions ---
def fade(width, height):
global background
surface = pygame.Surface((width, height))
surface.fill((31,97,141))
for alpha in range(0, 256):
surface.set_alpha(alpha)
screen.blit(surface, (0,0))
clock.tick(FPS)
pygame.display.update()
print('after fade')
background = surface
# --- main ---
pygame.init()
screen = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT))
clock = pygame.time.Clock()
background = pygame.Surface((DISPLAY_WIDTH, DISPLAY_HEIGHT))
background.fill(SKY_BLUE)
#FADE_EVENT = pygame.event.custom_type() # PyGame 2.0
FADE_EVENT = pygame.USEREVENT # PyGame 1.9
#pygame.time.set_timer(FADE_EVENT, 2000, True) # PyGame 2.0 # `once=True` - turn off after one use
pygame.time.set_timer(FADE_EVENT, 2000) # PyGame 1.9 # doesn't have `once`, it will need `set_timer(..., 0)`
running = True
while running:
screen.blit(background, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == FADE_EVENT:
pygame.time.set_timer(FADE_EVENT, 0) # PyGame 1.9 # turn off after one use
fade(DISPLAY_WIDTH, DISPLAY_HEIGHT)
clock.tick(FPS)
pygame.display.update()
# - end -
pygame.quit()