如何修改Pygame星形绘制代码添加内部条纹图案？

下面提供两种实用的实现方式，你可以根据需求选择：

方案1：中心辐射状条纹 #

这种方式从星形中心向各个顶点绘制线条，形成放射状条纹效果，代码改动极小：

import pygame

# Window size
WINDOW_WIDTH    = 400
WINDOW_HEIGHT   = 400

DARK_BLUE  = (   3,   5,  54)
STARRY     = ( 230, 255, 80 )


### initialisation
pygame.init()
window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
pygame.display.set_caption("Star with Radial Stripes")


# Define a star
centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
                 (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]

# Main Loop
clock = pygame.time.Clock()
done = False
while not done:

    # Handle user-input
    for event in pygame.event.get():
        if ( event.type == pygame.QUIT ):
            done = True

    # Re-draw the window
    window.fill( DARK_BLUE )                             # background fill
    pygame.draw.polygon( window, STARRY, star_points )   # Draw the star base
    
    # 添加中心辐射条纹
    stripe_color = DARK_BLUE
    stripe_thickness = 3
    for point in star_points:
        pygame.draw.line(window, stripe_color, centre_coord, point, stripe_thickness)
    
    pygame.display.flip()                                # Update the display

    # Clamp FPS
    clock.tick_busy_loop(60)

pygame.quit()

方案2：平行填充条纹（横向/纵向） #

如果需要平行条纹效果，可以利用Pygame的**剪切区域（clip）**功能，限制条纹仅在星形内部绘制，灵活性更高：

import pygame

# Window size
WINDOW_WIDTH    = 400
WINDOW_HEIGHT   = 400

DARK_BLUE  = (   3,   5,  54)
STARRY     = ( 230, 255, 80 )


### initialisation
pygame.init()
window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
pygame.display.set_caption("Star with Parallel Stripes")


# Define a star
centre_coord = ( WINDOW_WIDTH//2, WINDOW_HEIGHT//2 )
star_points  = [ (165, 151), (200, 20), (235, 151), (371, 144), (257, 219),
                 (306, 346), (200, 260), (94, 346), (143, 219), (29, 144)   ]

# Main Loop
clock = pygame.time.Clock()
done = False
while not done:

    # Handle user-input
    for event in pygame.event.get():
        if ( event.type == pygame.QUIT ):
            done = True

    # Re-draw the window
    window.fill( DARK_BLUE )                             # background fill
    
    # 创建带alpha的表面，用于绘制带条纹的星形
    star_surface = pygame.Surface((WINDOW_WIDTH, WINDOW_HEIGHT), pygame.SRCALPHA)
    # 先绘制星形底色
    pygame.draw.polygon(star_surface, STARRY, star_points)
    # 设置剪切区域，后续绘制仅在星形内部生效
    star_surface.set_clip(star_points)
    
    # 绘制横向条纹（改成x轴循环可实现纵向条纹）
    stripe_color = DARK_BLUE
    stripe_height = 8
    stripe_spacing = stripe_height  # 间距等于条纹高度，形成交替效果
    for y in range(0, WINDOW_HEIGHT, stripe_height + stripe_spacing):
        pygame.draw.rect(star_surface, stripe_color, (0, y, WINDOW_WIDTH, stripe_height))
    
    # 将带条纹的星形贴到窗口
    window.blit(star_surface, (0, 0))
    
    pygame.display.flip()                                # Update the display

    # Clamp FPS
    clock.tick_busy_loop(60)

pygame.quit()

补充说明 #

• 方案1适合快速实现放射状效果，调整stripe_thickness可改变线条粗细；
• 方案2可通过修改stripe_height、stripe_spacing或循环轴方向，得到不同密度、方向的平行条纹；
• 若需要斜向条纹，可将绘制矩形改为绘制斜线，循环调整线条的起始/结束坐标即可。

内容的提问来源于stack exchange，提问作者3141592654