【发布时间】：2021-12-13 00:48:48
【问题描述】：
我尝试使用 Pygame 制作一个简单的关卡，它会在玩家移动到特定位置时更改背景（简单的关卡/场景更改）。
在启动时，我的第一个背景绘制正确。当我更改背景（移动到左上角）时，第二个背景被正确绘制。但是当我移动到屏幕上的特定位置时，在透明精灵后面（使用 set_keycolor 设置透明）不是我的第二个（正确）背景，而是最初的第一个。
我是否需要明确清除屏幕对象的背景？我必须删除屏幕对象，然后创建一个全新的对象吗？
程序.py
#!/usr/bin/env python
import pygame
from player import Character
# see if we can load more than standard BMP
if not pygame.image.get_extended():
raise SystemExit("Sorry, extended image module required")
# globals
id = 1
# main
def main(winstyle=0):
# Initialize pygame
pygame.init()
SCREENRECT = pygame.Rect(0, 0, 630, 450)
winstyle = 0 # |FULLSCREEN
bestdepth = pygame.display.mode_ok(SCREENRECT.size, winstyle, 32)
screen = pygame.display.set_mode(SCREENRECT.size, winstyle, bestdepth)
BG_TILE_SIZE = 90
# decorate the game window
pygame.display.set_caption("Pygame TEST")
pygame.mouse.set_visible(0)
# create the background, tile the bgd image
background = pygame.Surface(SCREENRECT.size)
background.fill((0,0,255))
screen.blit(background, (0, 0))
pygame.display.flip()
# Initialize Game Groups
all = pygame.sprite.RenderUpdates()
# assign default groups to each sprite class
Character.containers = all
# Create Some Starting Values
clock = pygame.time.Clock()
# initialize our starting sprites
player = Character(SCREENRECT)
# Run our main loop whilst the player is alive.
while player.alive():
# get input
for event in pygame.event.get():
if event.type == pygame.QUIT:
return
if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
return
# update all the sprites
all.update()
# handle player input
player.move(pygame.key.get_pressed(), SCREENRECT)
# change background
indexX, indexY = player.rect.center
if checkPlayerPosition(indexY, screen, background):
player.rect = player.image.get_rect(center=SCREENRECT.center)
# clear/erase the last drawn sprites
all.clear(screen, background)
# draw the scene
dirty = all.draw(screen)
pygame.display.update(dirty)
# cap the framerate at 60fps. Also called 60HZ or 60 times per second.
clock.tick(60)
pygame.time.wait(1000)
# change the background
def checkPlayerPosition(indexY, screen, background):
global id
if id == 1:
if indexY < 90:
screen.fill((0,0,0))
pygame.display.flip()
background.fill((0,0,255))
id = -1
return True
else:
if indexY > 360:
screen.fill((0,0,255))
pygame.display.flip()
background.fill((0,0,0))
id = 1
return True
return False
# call the "main" function if running this script
if __name__ == "__main__":
main()
pygame.quit()
这是我的精灵的代码。
player.py：
import os
import pygame
class Character(pygame.sprite.Sprite):
# fields
speed = 4
run = 1
images = []
# constructor
def __init__(self, SCREENRECT):
pygame.sprite.Sprite.__init__(self, self.containers)
self.setCharImages()
self.image = self.images[0]
self.rect = self.image.get_rect(center=SCREENRECT.center)
self.reloading = 0
self.origtop = self.rect.top
self.facing = -1
# sets the character image array
def setCharImages(self):
img = self.load_image("char.png")
img.set_colorkey((0,0,0))
self.images = [img,
pygame.transform.flip(img, 1, 1),
pygame.transform.rotate(img, 270),
pygame.transform.rotate(img, 90)]
# loads an image from disk
def load_image(self, file):
try:
MAIN_DIR = os.path.split(os.path.abspath(__file__))[0]
surface = pygame.image.load(os.path.join(MAIN_DIR, "img", file))
except pygame.error:
raise SystemExit('Could not load image "%s" %s' % (file, pygame.get_error()))
return surface.convert()
# move operation and animation
def move(self, keystate, SCREENRECT):
if keystate[pygame.K_LSHIFT]:
self.run = 2
else:
self.run = 1
movX = (keystate[pygame.K_RIGHT] - keystate[pygame.K_LEFT]) * self.speed * self.run
movY = (keystate[pygame.K_DOWN] - keystate[pygame.K_UP]) * self.speed * self.run
self.rect.move_ip(movX, movY)
self.rect = self.rect.clamp(SCREENRECT)
if movX < 0:
self.image = self.images[0]
elif movX > 0:
self.image = self.images[1]
if movY < 0:
self.image = self.images[2]
elif movY > 0:
self.image = self.images[3]
这是第一关，开始游戏时。
这是有故障的版本，在我更改了级别并且背景变黑之后。如您所见，精灵获取的透明背景被第一个添加的背景层替换，而不是第二个。
所以基本上我会说，当移动我的精灵时，错误的背景会被重绘，当它离开它的位置时。这只发生在第二个屏幕上！如果我回到第一个，我不会遇到这个故障。
所以基本上我上面的简短代码示例中的两行实际上在这里调用了这个函数。也许这会导致问题？！
【问题讨论】：