Pygame image transparency confusion [duplicate]

by

If you copy a transparent Surface to another Surface the target Surface has to provide transparency respectively per pixel alpha.

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):

my_surface = pygame.Surface((width, height), pygame.SRCALPHA)

Use the following image

and adapt the method image_at of the class SpriteSheet. Use 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

Or use convert_alpha():

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).convert_alpha() # <----
        image.fill((0, 0, 0, 0))                          # <---
        
        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

See also:

Note that chess pieces can also be drawn through a Unicode text.
See Displaying unicode symbols using pygame

More Related Contents:

  1. Is there any other way to load a resource like an image, sound, or font into Pygame? [closed]
  2. How can I load an animated GIF and get all of the individual frames in Pygame?
  3. How do I detect collision in pygame?
  4. Could not open resource file, pygame error: “FileNotFoundError: No such file or directory.”
  5. How can I make the ball move instead of stretch in pygame?
  6. How do I blit a PNG with some transparency onto a surface in Pygame?
  7. How to convert the background color of image to match the color of Pygame window?
  8. How can I add an image or icon to a button rectangle in Pygame?
  9. Lag when win.blit() background pygame
  10. What is a good way to draw images using pygame?
  11. Pygame is running slow
  12. How to get the correct dimensions for a pygame rectangle created from an image
  13. How can I crop an image with Pygame?
  14. How can I make an Image with a transparent Backround in Pygame?
  15. Move Character with Vector
  16. PIL and pygame.image
  17. SVG rendering in a PyGame application. Prior to Pygame 2.0, Pygame did not support SVG. Then how did you load it?
  18. How do I scale a PyGame image (Surface) with respect to its center?
  19. How to rotate an image around its center while its scale is getting larger(in Pygame)
  20. How do I convert an OpenCV image (BGR and BGRA) to a pygame.Surface object
  21. How to draw images and sprites in pygame?
  22. How can I move the ball instead of leaving a trail all over the screen in pygame?
  23. Drag multiple sprites with different “update ()” methods from the same Sprite class in Pygame
  24. How to draw a chessboard with Pygame and move the pieces on the board?
  25. How to zoom in and out of an image pygame and using the mousposition as the center of the zoom
  26. How do I focus light or how do I only draw certain circular parts of the window in pygame?
  27. How do I make the screen ignore the background color of some image?
  28. How to fix this DeprecationWarning
  29. Pygame not returning events while embedded in PyQt
  30. How can I drag more than 2 images in PyGame?

Leave a Comment