关于 pygame.mask 函数的问题

Question

所以我看了pygame的文档，但是没看明白。我最近问了一个关于位图字体的问题，我得到了一些代码作为答案；这是代码：

import pygame

pygame.init()
win = pygame.display.set_mode((800, 600))
font = pygame.font.Font("freesansbold.ttf", 32)
i = 0
text = "hello how are you?"
run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    letter = text[i]
    text_1 = font.render(letter, True, (255, 255, 255))

    bw, bh = font.size(letter)
    glyph_rect = pygame.mask.from_surface(text_1).get_bounding_rects()
    # print(glyph_rect)
    if glyph_rect:
        gh = glyph_rect[0].height
        print(f'letter {letter}  bitmap height: {bh}  glyph height: {gh}')

    win.fill((0, 0, 0))
    win.blit(text_1, (0, 0))
    pygame.display.update()

    i += 1
    run = i < len(text)

pygame.quit()

所以，我的问题在线glyph_rect = pygame.mask.from_surface(text_1).get_bounding_rects()。

pygame.mask.from_surface()函数有什么作用？
行 glyph_rect = pygame.mask.from_surface(text_1).get_bounding_rects() 是做什么的？
变量 glyph_rect return 有哪些参数，这些参数的含义是什么？

Answer 1

pygame.mask.from_surface creates a pygame.mask.Mask object form a pygame.Surface.
A Surface 是位图。 Mask 是具有 Boolean 个值的二维数组。创建的Mask是_Surface的大小。如果表面中的相应像素不透明，则场是 True，如果是透明的，则场是 False。

pygame.mask.Mask.get_bounding_rects creates a list of pygame.Rect 个对象。每个矩形描述了连接像素的边界区域。如果 Surface 恰好包含 1 个连接的图像，您将得到恰好 1 个围绕图像的矩形。

参见示例。黑色矩形是 Surface 矩形，红色矩形是连接组件的边界矩形：

repl.it/@Rabbid76/ImageHitbox

import pygame

def getMaskRect(surf, top = 0, left = 0):
    surf_mask = pygame.mask.from_surface(surf)
    rect_list = surf_mask.get_bounding_rects()
    surf_mask_rect = rect_list[0].unionall(rect_list)
    surf_mask_rect.move_ip(top, left)
    return surf_mask_rect

pygame.init()
window = pygame.display.set_mode((400, 400))
clock = pygame.time.Clock()

try:
    my_image = pygame.image.load('Bomb-256.png')
except:
    my_image = pygame.Surface((200, 200), pygame.SRCALPHA)
    pygame.draw.circle(my_image, (0, 128, 0), (60, 60), 40)
    pygame.draw.circle(my_image, (0, 0, 128), (100, 150), 40)

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    pos = window.get_rect().center
    my_image_rect = my_image.get_rect(center = pos)
    my_image_mask_rect = getMaskRect(my_image, *my_image_rect.topleft)

    window.fill((255, 255, 255))
    window.blit(my_image, my_image_rect)
    pygame.draw.rect(window, (0, 0, 0), my_image_rect, 3)
    pygame.draw.rect(window, (255, 0, 0), my_image_mask_rect, 3)
    pygame.display.flip()

pygame.quit()
exit()

关于 pygame.mask 函数的问题

Questions regarding the pygame.mask function

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pygame

mask