问题描述
我在此处阅读了与此问题相关的前20条帖子，在Google上阅读了很多示例，尝试使用.convert()，.convert_alpha()，尝试都不使用，.png，.gif， Google上排名前5位的不同图片。请有人帮我弄清楚如何以透明背景显示作品。
这是所有代码：
import pygame
pygame.init()
print("1")
screen_size = (600,600)
blue = (100,225,225)
screen = pygame.display.set_mode(screen_size)
pygame.display.set_caption("Chess")
class SpriteSheet:
def __init__(self,filename):
"""Load the sheet."""
try:
self.sheet = pygame.image.load(filename).convert.alpha()
except pygame.error as e:
print(f"Unable to load spritesheet image: {filename}")
raise SystemExit(e)
def image_at(self,rectangle,colorkey = None):
"""Load a specific image from a specific rectangle."""
# Loads image from x,y,x+offset,y+offset.
rect = pygame.Rect(rectangle)
image = pygame.Surface(rect.size)
image.blit(self.sheet,(0,0),rect)
if colorkey is not None:
if colorkey == -1:
colorkey = image.get_at((0,0))
image.set_colorkey(colorkey,pygame.RLEACCEL)
return image
def images_at(self,rects,colorkey = None):
"""Load a whole bunch of images and return them as a list."""
return [self.image_at(rect,colorkey) for rect in rects]
def load_strip(self,rect,image_count,colorkey = None):
"""Load a whole strip of images,and return them as a list."""
tups = [(rect[0]+rect[2]*x,rect[1],rect[2],rect[3])
for x in range(image_count)]
return self.images_at(tups,colorkey)
print("2")
class Game:
def __init__(self):
self.playing = False
self.move = 0
self.player_turn = 1
self.quit = False
def quit(self):
self.quit = True
print("3")
class Piece:
def __init__(self):
self.sprite = None
self.spacial = [0,0]
self.temporal = [0,0]
self.position = [self.spacial,self.temporal]
self.color = ""
self.type = ""
print("4")
chess_image = SpriteSheet('ChesspiecesArray.png')
colors = ["White","Black"]
types = ["K","Q","B","N","R","P"]
rect_piece = (0,133,133)
print("5")
class ChessSet:
def __init__(self):
self.set = []
def create_set(self):
for i in range(2):
for j in range(6):
this_piece = Piece()
this_piece.color = colors[i]
this_piece.type = types[j]
rect_set = (133*j,133*i,133*(j+1),133*(i+1))
this_piece.sprite = SpriteSheet.image_at(chess_image,rect_set)
self.set.append(this_piece)
print("6")
chess = Game()
set_one = ChessSet()
set_one.create_set()
print("7")
while not chess.quit:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
chess.quit()
screen.fill(blue)
screen.blit(set_one.set[0].sprite,(10,10))
pygame.display.flip()
以下是我花时间尝试的一些图片：
解决方法
如果将透明的 Surface 复制到另一个 Surface ，则目标 Surface 必须分别为每个像素alpha提供透明度。
创建新曲面时可以启用其他功能。设置SRCALPHA标志以创建具有包括每个像素alpha的图像格式的表面。像素的初始值为（0，0，0，0）：
my_surface = pygame.Surface((width,height),pygame.SRCALPHA)
使用以下图片
并修改类image_at的方法SpriteSheet。使用pygame.SRCALPHA：
class SpriteSheet:
# [...]
def image_at(self,rectangle,colorkey = None):
"""Load a specific image from a specific rectangle."""
# Loads image from x,y,x+offset,y+offset.
rect = pygame.Rect(rectangle)
image = pygame.Surface(rect.size,pygame.SRCALPHA) # <----
image.blit(self.sheet,(0,0),rect)
if colorkey is not None:
if colorkey == -1:
colorkey = image.get_at((0,0))
image.set_colorkey(colorkey,pygame.RLEACCEL)
return image
或使用convert_alpha()：
class SpriteSheet:
# [...]
def image_at(self,y+offset.
rect = pygame.Rect(rectangle)
image = pygame.Surface(rect.size).convert_alpha() # <----
image.fill((0,0)) # <---
image.blit(self.sheet,pygame.RLEACCEL)
return image
另请参阅：
- How can I make an Image with a transparent Backround in Pygame?
- How do I blit a PNG with some transparency onto a surface in Pygame?
请注意，棋子也可以通过Unicode文本绘制。
参见Displaying unicode symbols using pygame