无法绘制一行矩形（pygame）

Question

我正在尝试绘制一个简单的矩形行，但是当我执行此代码时，它不会向屏幕绘制任何内容。我无法弄清楚为什么。我可能忽略了一些非常明显的事情，但我只需要有人指点我。

我的代码：

import pygame

# Define some colors
black    = (   0,   0,   0)
white    = ( 255, 255, 255)
green    = (   0, 255,   0)
red      = ( 255,   0,   0)

pygame.init()

# Set the width and height of the screen [width,height]
size = [255,255]
screen = pygame.display.set_mode(size)

pygame.display.set_caption("My Game")
width = 20
height = 20
margin = 5
x = 0

#Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()

# -------- Main Program Loop -----------
while done == False:
    # ALL EVENT PROCESSING SHOULD GO BELOW THIS COMMENT
    for event in pygame.event.get(): # User did something
        if event.type == pygame.QUIT: # If user clicked close
            done = True # Flag that we are done so we exit this loop
    # ALL EVENT PROCESSING SHOULD GO ABOVE THIS COMMENT


    # ALL GAME LOGIC SHOULD GO BELOW THIS COMMENT

    # ALL GAME LOGIC SHOULD GO ABOVE THIS COMMENT

    # ALL CODE TO DRAW SHOULD GO BELOW THIS COMMENT

    # First, clear the screen to white. Don't put other drawing commands
    # above this, or they will be erased with this command.
    screen.fill(black)
    for column in range(10):
        pygame.draw.rect(screen,white,[x,0,width, height])
        x += width

    # ALL CODE TO DRAW SHOULD GO ABOVE THIS COMMENT

    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

    # Limit to 20 frames per second
    clock.tick(20)

# Close the window and quit.
pygame.quit()

我已经浏览了stackoverflow和Google，我找到了一个解决方案：而不是范围（10）放入范围（1,100,10），并将x更改为列。但是我仍然不明白为什么我的代码不起作用，因为它对我来说似乎没问题。

Answer 1

你永远不会在循环中将x重置为零，因此广场会快速从屏幕右侧分流。

screen.fill(black)
x=0
for column in range(10):
    pygame.draw.rect(screen,white,[x,0,width, height])
    x += width

结果：

Answer 2

您的变量x在2帧内超出了屏幕范围，因为您不断为其添加宽度。你的盒子正在被绘制，但它们在屏幕上移动的速度太快而无法看到（你只是看不到它在你开始时再次将屏幕涂成黑色的每一帧）。

在每帧上将x重置为零，您将看到方框：

# line 48
x = 0
for column in range(10):
    pygame.draw.rect(screen,white,[x,0,width, height])
    x += width