将形状列表转换为蒙版。

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英文:

Pygame convert list of shapes to mask

问题

目标是在同一时刻，当一个形状或几个形状经过屏幕时，显示背景中的图像。我的方法是创建一个形状列表（矩形或圆形），然后将所有形状转换为蒙版，然后在每次循环中将屏幕填充为全黑，只显示蒙版。

有没有办法用形状列表创建一个蒙版？我查看了pygame.mask（https://www.pygame.org/docs/ref/mask.html?highlight=mask#module-pygame.mask），但看不到将形状列表转换为蒙版的方法。有什么建议吗？

英文:

The goal is to reveal an image in the background at the same time that a shape or a couple of shapes go through the screen. My approach is to create a list of shapes (rects or circles), then converting al that to a mask and then fill the screen all black but the masks every loop.

Is there a way to make a mask with a list of shapes? I checked pygame.mask (https://www.pygame.org/docs/ref/mask.html?highlight=mask#module-pygame.mask) but cant see a way to convert list of shapes to mask. Any advice?

答案1

得分: 1

你可以做的是为每个形状创建一个"Mask"，并创建一个用于填充（覆盖）整个屏幕的"Mask"。

然后，针对以这种方式创建的每个形状遮罩，使用"Mask.draw" 更新屏幕遮罩，类似于这样：

  1. for rect, mask in surfaces:
  2.     screen_mask.draw(mask, rect.topleft)

其中，"surfaces" 是一个包含"Rect" / "Mask" 元组的列表。

然后，您可以使用屏幕遮罩来覆盖屏幕，例如使用"Mask.to_surface"，如下所示：

  1. new_background = screen_mask.to_surface(background.copy(), setsurface=background)
  2. screen.blit(new_background, (0, 0))

其中，"background" 是您的原始背景图像，"screen_mask" 是应该覆盖屏幕的遮罩，"new_background" 是您要绘制而不是"background" 的表面。

这里是我拼凑的一个示例，你可以了解一下：

  1. import pygame, math
  3. def main():
  4.     d = 0
  5.     pygame.init()
  6.     screen = pygame.display.set_mode((640, 960))
  7.     img = pygame.image.load('pexels-stijn-dijkstra-16745023.jpg').convert()
  8.     
  9.     triangle = pygame.Surface((32, 32))
  10.     triangle.set_colorkey((0,0,0))
  11.     pygame.draw.lines(triangle, 'red', True, ((0, 0), (32, 0), (16, 32)), 8)
  12.     triangle_rect = triangle.get_frect(center=(400, 100))
  13.     triangle_mask = pygame.mask.from_surface(triangle)
  15.     circle = pygame.Surface((32, 32))
  16.     circle.set_colorkey((0,0,0))
  17.     pygame.draw.circle(circle, 'yellow', (16, 16), 16)
  18.     pygame.draw.circle(circle, 'black', (16, 16), 12)
  19.     circle_rect = circle.get_frect(center=(200, 400))
  20.     circle_mask = pygame.mask.from_surface(circle)
  21.     
  22.     surfaces = (
  23.         (triangle, triangle_rect, triangle_rect, triangle_mask), 
  24.         (circle, circle_rect, circle_rect, circle_mask)
  25.     )
  27.     cloack = pygame.mask.Mask((640, 960))
  28.     clock = pygame.time.Clock()
  29.     while True:
  30.         for e in pygame.event.get():
  31.             if e.type == pygame.QUIT or e.type == pygame.KEYDOWN and e.key == pygame.K_ESCAPE:
  32.                 return
  34.         for surface, rect, base, mask in surfaces:
  35.             cloack.draw(mask, rect.topleft)
  36.             rect.x = base.x + math.sin(0.01 * pygame.time.get_ticks()) * 10
  37.             rect.y += 0.5
  38.             
  39.         back = cloack.to_surface(img.copy(), setsurface=img)
  40.         screen.blit(back, (0, 0))
  42.         for surface, rect, base, mask in surfaces:
  43.             screen.blit(surface, rect)
  45.         pygame.display.flip()
  46.         d = clock.tick(60)
  47.         
  48. main()

希望这能帮助你了解如何使用"Mask"来覆盖屏幕。

英文:

What you can do is to create a Mask for each shape and one Mask to fill (cover) the entire screen.

Then, for each shape mask created this way, update the screen mask with Mask.draw, something like this:

  1.     for rect, mask in surfaces:
  2. screen_mask.draw(mask, rect.topleft)

where surfaces is a list of Rect/Mask tuples.

Then you can use the screen mask to cover the screen, e.g. with Mask.to_surface like this:

  1. new_background = screen_mask.to_surface(background.copy(), setsurface=background)
  2. screen.blit(new_background, (0, 0))

where background is your original background image, screen_mask the mask that should cover the screen and new_background is the surface you draw instead of background.

Here's an example I hacked together; you'll get the idea:

  1. import pygame, math
  2. def main():
  3. d = 0
  4. pygame.init()
  5. screen = pygame.display.set_mode((640, 960))
  6. img = pygame.image.load('pexels-stijn-dijkstra-16745023.jpg').convert()
  7. triangle = pygame.Surface((32, 32))
  8. triangle.set_colorkey((0,0,0))
  9. pygame.draw.lines(triangle, 'red', True, ((0, 0), (32, 0), (16, 32)), 8)
  10. triangle_rect = triangle.get_frect(center=(400, 100))
  11. triangle_mask = pygame.mask.from_surface(triangle)
  12. circle = pygame.Surface((32, 32))
  13. circle.set_colorkey((0,0,0))
  14. pygame.draw.circle(circle, 'yellow', (16, 16), 16)
  15. pygame.draw.circle(circle, 'black', (16, 16), 12)
  16. circle_rect = circle.get_frect(center=(200, 400))
  17. circle_mask = pygame.mask.from_surface(circle)
  18. surfaces = (
  19. (triangle, triangle_rect, triangle_rect, triangle_mask), 
  20. (circle, circle_rect, circle_rect, circle_mask)
  21. )
  22. cloack = pygame.mask.Mask((640, 960))
  23. clock = pygame.time.Clock()
  24. while True:
  25. for e in pygame.event.get():
  26. if e.type == pygame.QUIT or e.type == pygame.KEYDOWN and e.key == pygame.K_ESCAPE:
  27. return
  28. for surface, rect, base, mask in surfaces:
  29. cloack.draw(mask, rect.topleft)
  30. rect.x = base.x + math.sin(0.01 * pygame.time.get_ticks()) * 10
  31. rect.y += 0.5
  32. back = cloack.to_surface(img.copy(), setsurface=img)
  33. screen.blit(back, (0, 0))
  34. for surface, rect, base, mask in surfaces:
  35. screen.blit(surface, rect)
  36. pygame.display.flip()
  37. d = clock.tick(60)
  38. main()

将形状列表转换为蒙版。

huangapple
  • 本文由 发表于 2023年6月29日 17:33:10
  • 转载请务必保留本文链接：https://go.coder-hub.com/76579819.html
  • pygame
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