我的矩形的 y 值在 pygame 中没有改变

Question

我正在使用 pygame 模块来制作一个简单的游戏。目前，我正在尝试让一个矩形在我的 500x500 屏幕上移动，但它只在 x 值（左右）中移动。

这是我的代码：

import pygame

pygame.init()

# Colors
white = (255, 255, 255)
black = (0, 0, 0)
blue = (0, 0, 255)

# Game Screen Dimensions
game_layout_length = 500
game_layout_width = 500

# Character Attributes
character_length = 10
character_width = 10
character_x = 0
character_y = 0

game_screen = pygame.display.set_mode((game_layout_width, game_layout_length))

game_close = False
game_lost = False

while not game_close:

    while not game_lost:

        for event in pygame.event.get():

            if event.type == pygame.QUIT:
                game_close = True
                game_lost = True

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    character_x -= 10

                elif event.key == pygame.K_RIGHT:
                    character_x += 10

                elif event.key == pygame.K_DOWN:
                    character_y -= 10

                elif event.key == pygame.K_UP:
                    character_y += 10

        pygame.draw.rect(game_screen, blue, [character_x, character_y, character_length, character_width])
        pygame.display.update()

print(f'{character_x, character_y}')
pygame.quit()
quit()

print(f'{character_x, character_y}') 行是调试行，它显示“character_y”的值正在改变，所以我一直在试图找出问题所在。

Answer 1

向下移动需要增大 y 而不是减小它，向上移动需要减小 y。您还可以在每次渲染时填充屏幕以避免出现拖尾矩形。

import pygame

pygame.init()

# Colors
white = (255, 255, 255)
black = (0, 0, 0)
blue = (0, 0, 255)

# Game Screen Dimensions
game_layout_length = 500
game_layout_width = 500

# Character Attributes
character_length = 10
character_width = 10
character_x = 0
character_y = 0

game_screen = pygame.display.set_mode((game_layout_width, game_layout_length))

game_close = False
game_lost = False

while not game_close:

    while not game_lost:

        for event in pygame.event.get():

            if event.type == pygame.QUIT:
                game_close = True
                game_lost = True

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    character_x -= 10

                elif event.key == pygame.K_RIGHT:
                    character_x += 10

                elif event.key == pygame.K_DOWN:
                    character_y += 10

                elif event.key == pygame.K_UP:
                    character_y -= 10
        game_screen.fill(black)
        pygame.draw.rect(game_screen, blue, [character_x, character_y, character_length, character_width])
        pygame.display.update()

print(f'{character_x, character_y}')
pygame.quit()
quit()