勾画互动

Question

嗨，我很难实现我的想法。我最初想用鼠标点击两下来绘制矩形，但是它不能正常工作，所以我把它简化成这样:用鼠标点击就可以画出固定大小的矩形。但是它仍然不起作用/.

import pygame
windowSize = (500,500)
white = (255,255,255)
black = (0,0,0)

pygame.init()
screen = pygame.display.set_mode(windowSize)
running = 1

while running:
    screen.fill(white)
    pygame.display.update()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            running = 0

问题就在这里

        elif event.type == pygame.MOUSEBUTTONDOWN:
            rect = pygame.Rect(event.dict["pos"],(30,50))
            pygame.draw.rect(screen,black,rect,1)


    pygame.display.flip()

我知道我的代码可能有很多概念错误.请帮帮忙！

Answer 1

你正在填充整个屏幕的每一个滴答。因此，在您实际绘制屏幕后，下一次勾选时，屏幕将再次变为空白。只需将screen.fill(white)从主周期中移出：

import pygame
windowSize = (500,500)
white = (255,255,255)
black = (0,0,0)

pygame.init()
screen = pygame.display.set_mode(windowSize)
running = 1

screen.fill(white)
while running:
    pygame.display.update()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
        elif event.type == pygame.MOUSEBUTTONDOWN:
            rect = pygame.Rect(event.dict["pos"],(30,50))
            pygame.draw.rect(screen,black,rect,1)
    pygame.display.flip()