使用图像透明度使“东西"看起来是黑色的

问题描述

我无法使用 Pygame 正确加载和 blit PNG 图像.代码实际上是有效的，但它显示了一些奇怪和黑色的东西"在我的精灵周围:

I'm having troubles to correctly load and blit PNG image with Pygame.Code is actually working, but it display some strange and black "things" around my sprite :

我的精灵周围的黑色东西

要加载tileset，我这样做:

To load tileset, I do:

    def TilesRessourceFile(self, filename=None, tileSize=None, tiles=None):
        logging.info("Loading ressources from %s", filename)
        self._tileSize = tileSize

        res = pygame.image.load(filename)
        res.convert_alpha()

        for tile in tiles:
            name, (x, y), alpha = tile.values()
            surface = pygame.Surface((tileSize, tileSize))
            surface.blit(res, (0, 0), area=(x * tileSize, y * tileSize, (x + 1) * tileSize, (y + 1) * tileSize))
            surface.convert_alpha() # set_colorkey(alpha)
            self._tiles.update({name: surface})

然后我像这样 blit 精灵

Then I blit the sprite like this

    def _implGameObjectRender(self, screen):
    # logging.info("Render map %s", self._mapping)
    for i in range(len(self._mapping)):
        for j in range(len(self._mapping[i])):
            screen.blit(self._mapping[i][j], (j * 128, i * 128))

可能不多，但我自己找不到解决方案.我已经试过检查:

It's probably not much, but I don't find the solution by myself.I already tried to check :

• 如何使用 pygame 加载 PNG
• pygame 的透明度(convert 和 convert_alpha)

我正在使用这个tileset:https://www.gamedevmarket.net/asset/2d-hand-painted-town-tileset-6626/

I'm using this tileset : https://www.gamedevmarket.net/asset/2d-hand-painted-town-tileset-6626/

tileset 提供了一个 json 文件来加载 Tiled.也试过这个，它完美地工作，所以我想问题出在我这边

The tileset provide a json file to load with Tiled. Also tried this, and it perfectly works so I guess the problem is on my side

谢谢你帮助我！

Python 3.9.1Pygame 2.0.1 (SDL 2.0.14)

Python 3.9.1Pygame 2.0.1 (SDL 2.0.14)

推荐答案

convert_alpha() 不会转换表面本身的格式，而是使用提供每像素 alpha 格式的格式创建新表面.

convert_alpha() does not convert the format of the surface itself, but creates a new surface with a format that provides a per pixel alpha format.

要么

surface = pygame.Surface((tileSize, tileSize))
surface = surface.convert_alpha()

或

surface = pygame.Surface((tileSize, tileSize)).convert_alpha()

---

有 3 种方法可以创建透明的表面:

• 使用set_colorkey()

颜色键指定被视为透明的颜色.例如，如果您有一张应该是透明的黑色背景图像，请设置一个黑色键:

The color key specifies the color that is treated as transparent. For example, if you have an image with a black background that should be transparent, set a black color key:

surface.set_colorkey((0, 0, 0))

您可以在创建新表面时启用其他功能.设置 SRCALPHA 标志以创建带有包含每像素 alpha 的图像格式.像素的初始值为(0, 0, 0, 0):

You can enable additional functions when creating a new surface. Set the SRCALPHA flag to create a surface with an image format that includes a per-pixel alpha. The initial value of the pixels is (0, 0, 0, 0):

surface = pygame.Surface((tileSize, tileSize), pygame.SRCALPHA)

使用convert_alpha() 使用提供每像素 alpha 的图像格式创建 Surface 的副本.

但是，如果您创建一个新表面并使用 convert_alpha()，则 alpha 通道最初设置为最大值.像素的初始值为 (0, 0, 0, 255).您需要先用透明颜色填充整个表面，然后才能在其上绘制任何内容:

However, if you create a new surface and use convert_alpha(), the alpha channels are initially set to maximum. The initial value of the pixels is (0, 0, 0, 255). You need to fill the entire surface with a transparent color before you can draw anything on it:

surface = pygame.Surface((tileSize, tileSize))
surface = surface.convert_alpha()
surface.fill((0, 0, 0, 0))

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