pygame图像透明度混乱

如何解决pygame图像透明度混乱

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：

编辑：这是我的错误消息在我的代码与建议的更改的屏幕快照

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