python3中pygame的显示问题答案

【问题标题】：display issue with pygame in python3python3中pygame的显示问题
【发布时间】：2021-04-02 02:36:35
【问题描述】：

This is the output of my code. I can't figure out how to fix this issue. 此代码在使用 Pygame 创建的窗口中显示奇怪的线条。我正在学习如何在 Pygame 中使用箭头键并且不能摆脱窗口中的这个故障。我更改的代码在极客的极客上：https://www.geeksforgeeks.org/python-drawing-design-using-arrow-keys-in-pygame/ 这工作得很好，但是当我使用不同大小的窗口和不同的形状来绘制它时，它会在窗口中显示奇怪的线条。

import pygame
import tkinter

pygame.init()

# create the display surfce object of specific dimensions (1000x1000).
win = pygame.display.set_mode((500, 500))

# Setting the window name
pygame.display.set_caption("Dungen World")

# Current coordinates
x = 250
y = 250

# dimensions of the player
width = 10
height = 10

# Speed of movement
vel = 2.5

# Indicator that pygame is running
running = True

# Main game loop
while running:
    # Time delay(milliseconds)
    pygame.time.delay(10)

    # Iterate over the list of event objects
    # that was returned by the pygame.event.get()
    for event in pygame.event.get():

        # if event object type is QUIT
        # then quitting the pygame
        # and program both
        if event.type == pygame.QUIT:
            # This will exit the while loop
            running = False

    # Stores the key pressed
    keys = pygame.key.get_pressed()

    # If left arrow key is pressed
    if keys[pygame.K_LEFT] and x > 5:
        # Decrement in x coordinates
        x -= vel

    # If left arrow key is pressed
    if keys[pygame.K_RIGHT] and x < 500 - width:
        # Decrement in x coordinates
        x += vel

    # If left arrow key is pressed
    if keys[pygame.K_UP] and y > 5:
        # Decrement in x coordinates
        y -= vel

    # If left arrow key is pressed
    if keys[pygame.K_DOWN] and y < 500 - height:
        # Decrement in x coordinates
        y += vel

    # drawing the square on screen
    pygame.draw.circle(win, (255, 255, 255), (x, y), width/2)

    # To refresh the window
    pygame.display.update()

# Closes the pygame window
pygame.quit()

【问题讨论】：

代码对我来说很好用。如果您调用pygame.display.flip() 而不是pygame.display.update()，会有什么变化吗？
在我的 Linux 机器上运行良好。可能是 macOS 问题？
似乎是 macOS 图形问题。如果您使用较新版本的python + pygame，问题仍然存在吗？在 Windows 上对我来说，python2.7/3.6/3.8 这工作正常
pygame.display.flip() 仍然有同样的问题
已更新所有内容，但仍然无法正常工作，可能是 macOS 图形问题！

标签： python macos pygame atom-editor

【解决方案1】：

在游戏循环开始时添加win.fill((0, 0, 0))（或您想要的任何背景颜色）。出于某种原因，如果背景没有颜色，macOS 会发疯。

您的代码应如下所示：

import pygame
import tkinter

pygame.init()

# create the display surfce object of specific dimensions (1000x1000).
win = pygame.display.set_mode((500, 500))

# Setting the window name
pygame.display.set_caption("Dungen World")

# Current coordinates
x = 250
y = 250

# dimensions of the player
width = 10
height = 10

# Speed of movement
vel = 2.5

# Indicator that pygame is running
running = True

# Main game loop
while running:
    # Time delay(milliseconds)
    pygame.time.delay(10)

    # Fill entire window with black
    win.fill((0, 0, 0))

    # Iterate over the list of event objects
    # that was returned by the pygame.event.get()
    for event in pygame.event.get():

        # if event object type is QUIT
        # then quitting the pygame
        # and program both
        if event.type == pygame.QUIT:
            # This will exit the while loop
            running = False

    # Stores the key pressed
    keys = pygame.key.get_pressed()

    # If left arrow key is pressed
    if keys[pygame.K_LEFT] and x > 5:
        # Decrement in x coordinates
        x -= vel

    # If left arrow key is pressed
    if keys[pygame.K_RIGHT] and x < 500 - width:
        # Decrement in x coordinates
        x += vel

    # If left arrow key is pressed
    if keys[pygame.K_UP] and y > 5:
        # Decrement in x coordinates
        y -= vel

    # If left arrow key is pressed
    if keys[pygame.K_DOWN] and y < 500 - height:
        # Decrement in x coordinates
        y += vel

    # drawing the square on screen
    pygame.draw.circle(win, (255, 255, 255), (x, y), width/2)

    # To refresh the window
    pygame.display.update()

# Closes the pygame window
pygame.quit()

编辑： 如果没有这段代码，玩家实际上不会“移动”，并且更像是一个绘图应用程序而不是游戏。

【讨论】：