屏幕被块化后，如果已经有一个移动的矩形，如何制作一个矩形？

Question

我正在 PyGame 中制作这个游戏并且我有一个移动的矩形，所以我想制作另一个矩形，当我按下 Space 栏时它会被绘制到屏幕上。所以我尝试添加 if 语句，但它不起作用，因为一旦绘制了矩形，屏幕就会填满。谁能告诉我如何在屏幕填充颜色后绘制矩形？

Here is my code

import pygame
from pygame.locals import *

pygame.init()

screenwidth = 1200
screenheight = 500
screen = pygame.display.set_mode((screenwidth, screenheight))
pygame.display.set_caption('Bullepacito')

def _rect():
    run = False
    while not run:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = True
            if event.type == pygame.KEYDOWN:
                if event.type == pygame.K_SPACE:
                    pygame.draw.rect(screen, (255, 0, 255), pygame.Rect(400, 400, 20, 20))

def gameloop():
    run = False
    shooterx = 350
    shootery = 350
    while not run:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                  shooterx -= 5  
                if event.key == pygame.K_RIGHT:
                    shooterx += 5
        screen.fill((30, 30, 30))
        pygame.draw.rect(screen, (255, 0, 255), pygame.Rect(shooterx, shootery, 50, 50))
        # Code to draw the rectangle on key press
        pygame.display.update()

gameloop()

Answer 1

当按下 SPACE 时设置一个布尔状态 (draw_rect) 并根据状态绘制矩形：

import pygame
from pygame.locals import *

pygame.init()

screenwidth = 1200
screenheight = 500
screen = pygame.display.set_mode((screenwidth, screenheight))
pygame.display.set_caption('Bullepacito')

def gameloop():
    run = False
    shooterx = 350
    shootery = 350
    draw_rect = False
    while not run:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                  shooterx -= 5  
                if event.key == pygame.K_RIGHT:
                    shooterx += 5

                if event.key == pygame.K_SPACE:
                    draw_rect = True

        screen.fill((30, 30, 30))
        pygame.draw.rect(screen, (255, 0, 255), pygame.Rect(shooterx, shootery, 50, 50))
        if draw_rect:
            pygame.draw.rect(screen, (255, 0, 255), pygame.Rect(400, 400, 20, 20))
        pygame.display.update()

gameloop()

屏幕被块化后，如果已经有一个移动的矩形，如何制作一个矩形？

After the screen is blitted how to make a rectangle when there is already an existing moving rectangle?

python

pygame