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flyps 发表于 2023-12-16 19:32:02

逐渐透明问题

这次的问题是按下对应的键(a)角色无法逐渐透明了不明白是怎么回事，请各位帮忙看看，谢谢
代码如下：import pygame
import sys
from pygame.locals import *

pygame.init()
er = True
w = True
running = True
size = width, height = 600, 400
screen = pygame.display.set_mode(size)
bmf = pygame.image.load('Chomper.gif').convert_alpha()
p = (300, 200)
bg = pygame.image.load('170731094492.jpg')
bgp = (0, 0)

def blit_alpha(t, t1, s, l, o):
    #print('正在调用函数中...')
    x = l
    y = l
    temp = pygame.Surface((s.get_width(), s.get_height())).convert()
    temp.blit(t1, (-x, -y))
    temp.blit(s, (0, 0))
    temp.set_alpha(o)
    t.blit(temp, l)

def rGraduallyTransparent(t, t1, s, l, n):
    z = n + 1
    for i in range(1, z):
      #print('执行中... x ', i)
      blit_alpha(t, t1, s, l, i)
      #print(f'此时blit_alpha的参数有{t}, {t1}, {s}, {l}, {i}')
      pygame.display.flip()
      pygame.time.delay(10)

def GraduallyTransparent(t, t1, s, l, n):
    z = n + 1
    for i in range(1, z, -1):
      print(1)
      blit_alpha(t, t1, s, l, i)
      #print(f'此时blit_alpha的参数有{t}, {t1}, {s}, {l}, {i}')
      pygame.display.flip()
      pygame.time.delay(10)

while True:   
    for event in pygame.event.get():
      if event.type == pygame.QUIT:
            sys.exit()
      screen.blit(bg, bgp)
      k = pygame.key.get_pressed()
      if k:
            rGraduallyTransparent(screen, bg, bmf, p, 100)
      if k:
            GraduallyTransparent(screen, bg, bmf, p, 100)

      screen.blit(bmf, p)
      pygame.display.flip()

FishC 发表于 2023-12-16 19:32:03

问题出在两个循环中的范围设置有误，应该从1到n+1。此外，应该将screen.blit(bg, bgp)和screen.blit(bmf, p)放在循环外面，否则会导致重复绘制背景和角色。修改后的代码如下：

import pygame
import sys
from pygame.locals import *

pygame.init()
er = True
w = True
running = True
size = width, height = 600, 400
screen = pygame.display.set_mode(size)
bmf = pygame.image.load('Chomper.gif').convert_alpha()
p = (300, 200)
bg = pygame.image.load('170731094492.jpg')
bgp = (0, 0)

def blit_alpha(t, t1, s, l, o):
    x = l
    y = l
    temp = pygame.Surface((s.get_width(), s.get_height())).convert()
    temp.blit(t1, (-x, -y))
    temp.blit(s, (0, 0))
    temp.set_alpha(o)
    t.blit(temp, l)

def rGraduallyTransparent(t, t1, s, l, n):
    z = n + 1
    for i in range(1, z):
      blit_alpha(t, t1, s, l, i)
      pygame.display.flip()
      pygame.time.delay(10)

def GraduallyTransparent(t, t1, s, l, n):
    z = n + 1
    for i in range(z, 1, -1):
      blit_alpha(t, t1, s, l, i)
      pygame.display.flip()
      pygame.time.delay(10)

while True:
    for event in pygame.event.get():
      if event.type == pygame.QUIT:
            sys.exit()

    screen.blit(bg, bgp)
    k = pygame.key.get_pressed()
    if k:
      rGraduallyTransparent(screen, bg, bmf, p, 100)
      GraduallyTransparent(screen, bg, bmf, p, 100)

    screen.blit(bmf, p)
    pygame.display.flip()

请注意，我也修复了if语句中的判断条件，现在只有在按下‘a’键时才会调用透明效果函数。

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