Pygame 在绘制完整的窗口网格后滞后答案

【问题标题】：Pygame lags after drawing full window gridPygame 在绘制完整的窗口网格后滞后
【发布时间】：2020-08-22 07:24:25
【问题描述】：

我编写了一个简单的 pygame 网格窗口。但 pygame 窗口在那之后开始滞后。

这是简单的代码？？？？

import pygame
import random

pygame.init()
pygame.font.init()

screen_width = 500
screen_height = screen_width

screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Snake GaMe By Akila")

def drawGrid():
    grid_list = []
    blockSize = 25
    for x in range(screen_width):
        for y in range(screen_height):
            rect = pygame.Rect(x*blockSize, y*blockSize, blockSize, blockSize)
            pygame.draw.rect(screen, (255,255,255), rect, 1)

running = True
while running:
    screen.fill((0,0,0))
    drawGrid()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    pygame.display.update()

我尝试改变drawGrid()函数位置的调用sn-p。

【问题讨论】：

标签： python pygame game-development

【解决方案1】：

为了提高性能，不要在每一帧都构建研磨。

用窗口大小创建一个pygame.Surface，并在这个表面上绘制网格：

grid_surf = pygame.Surface((screen_width,screen_height))
drawGrid(grid_surf)

这个表面是场景的背景。 blit 在每一帧的开头：

screen.blit(grid_surf, (0, 0))

示例代码：

import pygame
import random

pygame.init()
pygame.font.init()

screen_width = 500
screen_height = screen_width

screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Snake GaMe By Akila")

def drawGrid(surf):
    grid_list = []
    blockSize = 25
    for x in range(screen_width):
        for y in range(screen_height):
            rect = pygame.Rect(x*blockSize, y*blockSize, blockSize, blockSize)
            pygame.draw.rect(surf, (255,255,255), rect, 1)

grid_surf = pygame.Surface((screen_width,screen_height))
drawGrid(grid_surf)

running = True
while running:
    screen.blit(grid_surf, (0, 0))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    pygame.display.update()

【讨论】：