如何修改此代码以向星形添加条纹图案？

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英文:

How do I modify this code to add a striped pattern to the star?

问题

我有这个创建Pygame中星星的脚本。

  1. import pygame
  3. # 窗口大小
  4. 窗口宽度 = 400
  5. 窗口高度 = 400
  7. 深蓝色 = (3, 5, 54)
  8. 星星颜色 = (230, 255, 80)
  10. ### 初始化
  11. pygame.init()
  12. 窗口 = pygame.display.set_mode((窗口宽度, 窗口高度))
  13. pygame.display.set_caption("星星")
  15. # 定义一个星星
  16. 中心坐标 = (窗口宽度 // 2, 窗口高度 // 2)
  17. 星星点 = [(165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  18.           (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)]
  20. # 主循环
  21. 时钟 = pygame.time.Clock()
  22. 完成 = False
  23. while not 完成:
  25.     # 处理用户输入
  26.     for 事件 in pygame.event.get():
  27.         if 事件.type == pygame.QUIT:
  28.             完成 = True
  30.     # 重新绘制窗口
  31.     窗口.fill(深蓝色)                             # 填充背景
  32.     pygame.draw.polygon(窗口, 星星颜色, 星星点)   # 画星星
  33.     pygame.display.flip()                        # 更新显示
  35.     # 限制FPS
  36.     时钟.tick_busy_loop(60)
  38. pygame.quit()

是否有办法修改这个脚本以在星星内部创建条纹状形状？我已经查找了很多资源，但找不到如何做到这一点的方法。我尝试过在pygame和psychopy中都尝试过这个。如果有更好的方法，我可以重写整个脚本。

英文:

I have this script that creates a star in Pygame.

  1. import pygame
  3. # Window size
  4. WINDOW_WIDTH    = 400
  5. WINDOW_HEIGHT   = 400
  7. DARK_BLUE  = (   3,   5,  54)
  8. STARRY     = ( 230, 255, 80 )
  11. ### initialisation
  12. pygame.init()
  13. window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
  14. pygame.display.set_caption("Star")
  17. # Define a star
  18. centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
  19. star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  20.                  (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]
  22. # Main Loop
  23. clock = pygame.time.Clock()
  24. done = False
  25. while not done:
  27.     # Handle user-input
  28.     for event in pygame.event.get():
  29.         if ( event.type == pygame.QUIT ):
  30.             done = True
  32.     # Re-draw the window
  33.     window.fill( DARK_BLUE )                             # background fill
  34.     pygame.draw.polygon( window, STARRY, star_points )   # Draw the star
  35.     pygame.display.flip()                                # Update the display
  37.     # Clamp FPS
  38.     clock.tick_busy_loop(60)
  40. pygame.quit()

Is there a way I can modify this to have a striped shape within the star. I've looked and I can't find many resourced to do this. I've tried this in both pygame and psychopy. I'm open to rewriting the entire script if there is a better way to do this.

答案1

得分: 1

创建一个与星星大小相同的条纹图像。您可以根据喜好排列和着色条纹。例如：

  1. stripes = pygame.Surface(window.get_size())
  2. stripes.fill(STARRY)
  3. offset_x = 400
  4. for x in range(-offset_x, 400, 20):
  5.     if (x//20) % 2 == 0:
  6.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  7.         pygame.draw.polygon(stripes, "red", pts)

然后，您必须使用纹理来绘制多边形。有两种方法可以做到这一点。

选项1

您可以使用 pygame.gfxdraw.textured_polygon()，它可以绘制带纹理的多边形。导入 pygame.gfxdraw 模块：

  1. import pygame.gfxdraw

最后，使用 pygame.gfxdraw.textured_polygon() 绘制形状：

  1. pygame.gfxdraw.textured_polygon(window, star_points, stripes, 0, 0)

选项2

如果您不想使用 gfxdraw 模块，您可以裁剪图像。从星星点创建与图像大小相同的蒙版：

  1. mask_image = pygame.Surface(stripes.get_size(), pygame.SRCALPHA)
  2. pygame.draw.polygon(mask_image, (255, 255, 255), star_points)
  3. mask = pygame.mask.from_surface(mask_image)

使用条纹图像的蒙版创建一个裁剪的条纹图像。这也在我之前的一个答案中有解释：如何在pygame中自由变换图像？。

  1. star_stripes = mask.to_surface(setsurface = stripes.convert_alpha(), unsetcolor = (0, 0, 0, 0))

两种解决方案的最小示例：

如何修改此代码以向星形添加条纹图案？

选项1

  1. import pygame
  2. import pygame.gfxdraw
  4. # 窗口大小
  5. WINDOW_WIDTH    = 400
  6. WINDOW_HEIGHT   = 400
  8. DARK_BLUE  = (   3,   5,  54)
  9. STARRY     = ( 230, 255, 80 )
  11. ### 初始化
  12. pygame.init()
  13. window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
  14. pygame.display.set_caption("Star")
  16. # 定义一个星星
  17. centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
  18. star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  19.                  (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]
  21. stripes = pygame.Surface(window.get_size())
  22. stripes.fill(STARRY)
  23. offset_x = 400
  24. for x in range(-offset_x, 400, 20):
  25.     if (x//20) % 2 == 0:
  26.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  27.         pygame.draw.polygon(stripes, "red", pts)
  29. # 主循环
  30. clock = pygame.time.Clock()
  31. done = False
  32. while not done:
  34.     # 处理用户输入
  35.     for event in pygame.event.get():
  36.         if ( event.type == pygame.QUIT ):
  37.             done = True
  39.     # 重新绘制窗口
  40.     window.fill( DARK_BLUE )                             # 背景填充
  41.     pygame.gfxdraw.textured_polygon(window, star_points, stripes, 0, 0)
  42.     pygame.display.flip()                                # 更新显示
  44.     # 限制帧率
  45.     clock.tick_busy_loop(60)
  47. pygame.quit()

选项2

  1. import pygame
  3. # 窗口大小
  4. WINDOW_WIDTH    = 400
  5. WINDOW_HEIGHT   = 400
  7. DARK_BLUE  = (   3,   5,  54)
  8. STARRY     = ( 230, 255, 80 )
  10. ### 初始化
  11. pygame.init()
  12. window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
  13. pygame.display.set_caption("Star")
  15. # 定义一个星星
  16. centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
  17. star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  18.                  (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]
  20. stripes = pygame.Surface(window.get_size())
  21. stripes.fill(STARRY)
  22. offset_x = 400
  23. for x in range(-offset_x, 400, 20):
  24.     if (x//20) % 2 == 0:
  25.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  26.         pygame.draw.polygon(stripes, "red", pts)
  28. mask_image = pygame.Surface(stripes.get_size(), pygame.SRCALPHA)
  29. pygame.draw.polygon(mask_image, (255, 255, 255), star_points)
  30. mask = pygame.mask.from_surface(mask_image)
  31. star_stripes = mask.to_surface(setsurface = stripes.convert_alpha(), unsetcolor = (0, 0, 0, 0))
  33. # 主循环
  34. clock = pygame.time.Clock()
  35. done = False
  36. while not done:
  38.     # 处理用户输入
  39.     for event in pygame.event.get():
  40.         if ( event.type == pygame.QUIT ):
  41.             done = True
  43.     # 重新绘制窗口
  44.     window.fill( DARK_BLUE )                             # 背景填充
  45.     window.blit(star_stripes, (0, 0))
  46.     pygame.display.flip()                                # 更新显示
  48.     # 限制帧率
  49.     clock.tick_busy_loop(60)
  51. pygame.quit()
英文:

Create a striped image of the size of the star. You can arrange and color the strips as you like. For example:

  1. stripes = pygame.Surface(window.get_size())
  2. stripes.fill(STARRY)
  3. offset_x = 400
  4. for x in range(-offset_x, 400, 20):
  5.     if (x//20) % 2 == 0:
  6.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  7.         pygame.draw.polygon(stripes, "red", pts)

After that you have to use the texture to draw the polygon. There are 2 ways to do this.

Option 1

You can use pygame.gfxdraw.textured_polygon(), which draws a textured polygon. Import the pygame.gfxdraw module:

  1. import pygame.gfxdraw

Finally draw the shape with pygame.gfxdraw.textured_polygon():

  1. pygame.gfxdraw.textured_polygon(window, star_points, stripes, 0, 0)

Option 2

If you don't want to use the gfxdraw module you have to clip the image. Create a mask from the star points in the size of the image:

  1. mask_image = pygame.Surface(stripes.get_size(), pygame.SRCALPHA)
  2. pygame.draw.polygon(mask_image, (255, 255, 255), star_points)
  3. mask = pygame.mask.from_surface(mask_image)

Create a clipped striped image using the mask of the striped image. This is also explained in on one of my earlier answers: How to free transform image in pygame?.

  1. star_stripes = mask.to_surface(setsurface = stripes.convert_alpha(), unsetcolor = (0, 0, 0, 0))

Minimal examples of both solutions:

如何修改此代码以向星形添加条纹图案？

Option 1

  1. import pygame
  2. import pygame.gfxdraw
  4. # Window size
  5. WINDOW_WIDTH    = 400
  6. WINDOW_HEIGHT   = 400
  8. DARK_BLUE  = (   3,   5,  54)
  9. STARRY     = ( 230, 255, 80 )
  11. ### initialisation
  12. pygame.init()
  13. window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
  14. pygame.display.set_caption("Star")
  16. # Define a star
  17. centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
  18. star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  19.                  (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]
  21. stripes = pygame.Surface(window.get_size())
  22. stripes.fill(STARRY)
  23. offset_x = 400
  24. for x in range(-offset_x, 400, 20):
  25.     if (x//20) % 2 == 0:
  26.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  27.         pygame.draw.polygon(stripes, "red", pts)
  29. # Main Loop
  30. clock = pygame.time.Clock()
  31. done = False
  32. while not done:
  34.     # Handle user-input
  35.     for event in pygame.event.get():
  36.         if ( event.type == pygame.QUIT ):
  37.             done = True
  39.     # Re-draw the window
  40.     window.fill( DARK_BLUE )                             # background fill
  41.     pygame.gfxdraw.textured_polygon(window, star_points, stripes, 0, 0)
  42.     pygame.display.flip()                                # Update the display
  44.     # Clamp FPS
  45.     clock.tick_busy_loop(60)
  47. pygame.quit()

Option 2

  1. import pygame
  3. # Window size
  4. WINDOW_WIDTH    = 400
  5. WINDOW_HEIGHT   = 400
  7. DARK_BLUE  = (   3,   5,  54)
  8. STARRY     = ( 230, 255, 80 )
  10. ### initialisation
  11. pygame.init()
  12. window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
  13. pygame.display.set_caption("Star")
  15. # Define a star
  16. centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
  17. star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
  18.                  (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]
  20. stripes = pygame.Surface(window.get_size())
  21. stripes.fill(STARRY)
  22. offset_x = 400
  23. for x in range(-offset_x, 400, 20):
  24.     if (x//20) % 2 == 0:
  25.         pts = [(x, 0), (x+20, 0), (x+20+offset_x, 400), (x+offset_x, 400)]
  26.         pygame.draw.polygon(stripes, "red", pts)
  28. mask_image = pygame.Surface(stripes.get_size(), pygame.SRCALPHA)
  29. pygame.draw.polygon(mask_image, (255, 255, 255), star_points)
  30. mask = pygame.mask.from_surface(mask_image)
  31. star_stripes = mask.to_surface(setsurface = stripes.convert_alpha(), unsetcolor = (0, 0, 0, 0))
  33. # Main Loop
  34. clock = pygame.time.Clock()
  35. done = False
  36. while not done:
  38.     # Handle user-input
  39.     for event in pygame.event.get():
  40.         if ( event.type == pygame.QUIT ):
  41.             done = True
  43.     # Re-draw the window
  44.     window.fill( DARK_BLUE )                             # background fill
  45.     window.blit(star_stripes, (0, 0))
  46.     pygame.display.flip()                                # Update the display
  48.     # Clamp FPS
  49.     clock.tick_busy_loop(60)
  51. pygame.quit()

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  • 本文由 发表于 2023年7月7日 08:08:37
  • 转载请务必保留本文链接：https://go.coder-hub.com/76633186.html
  • pygame
  • python
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