尝试让 pygame 文档代码正常工作

Question

我正在浏览 pygame 1.9.6 的文档，已经读到了第 29 页，老实说，我只是无法理解为什么我不能让它按照它所说的去做（用红色制作一个绿色矩形）点和黑色文本定义 4 个角、4 个中点和中心点。

文档代码可在第 29 页查看： https://buildmedia.readthedocs.org/media/pdf/pygame/latest/pygame.pdf

我觉得他们提供的示例遗漏了很多东西，所以我稍微尝试了一下，但已经达到了我只想看看如何让它按照它所说的去做的地步。

我的变化：

import pygame

from pygame.locals import *

from pygame.rect import *

from pygame.font import *

def draw_point(text, pos):

    img = font.render(text, True, Black)

    pygame.draw.circle(screen, RED, pos, 3)

    screen.blit(img, pos)

SIZE = 500, 200

RED = (255, 0, 0)

GRAY = (150, 150, 150)

GREEN = (255, 0, 0)

BLACK = (255, 255, 255)

pygame.init()

screen = pygame.display.set_mode(SIZE)

rect = Rect(50, 40, 250, 80)

##print(f'x={rect.x}, y={rect.y}, w={rect.w}, h={rect.h}')

##print(f'left={rect.left}, top={rect.top}, right={rect.right}, bottom={rect.bottom}')

##print(f'center={rect.center}')

running = True

while running:

    for event in pygame.event.get():

        if event.type == QUIT:

            running = False

    screen.fill(GRAY)

    pygame.draw.rect(screen, GREEN, rect, 4)

    for pt in pts:

        draw_point(pt, eval('rect.'+pt))

        

    pygame.display.flip()

pygame.quit()

任何帮助表示赞赏！

Answer 1

阅读完整的文档。该变量pts位于第 25 页pts = ('topleft', 'topright', 'bottomleft', 'bottomright',        'midtop', 'midright', 'midbottom', 'midleft', 'center')该变量font位于第 36 页：font = pygame.font.Font(None, 24)完整示例：import pygamefrom pygame.locals import *from pygame.rect import *from pygame.font import *def draw_point(text, pos):    img = font.render(text, True, BLACK)    pygame.draw.circle(screen, RED, pos, 3)    screen.blit(img, pos)SIZE = 500, 200RED = (255, 0, 0)GRAY = (150, 150, 150)GREEN = (0, 255, 0)BLACK = (0, 0, 0)pygame.init()screen = pygame.display.set_mode(SIZE)font = pygame.font.Font(None, 24)rect = Rect(50, 40, 250, 80)pts = ('topleft', 'topright', 'bottomleft', 'bottomright',        'midtop', 'midright', 'midbottom', 'midleft', 'center')running = Truewhile running:    for event in pygame.event.get():        if event.type == QUIT:            running = False    screen.fill(GRAY)    pygame.draw.rect(screen, GREEN, rect, 4)    for pt in pts:        draw_point(pt, eval('rect.'+pt))            pygame.display.flip()pygame.quit()