如何调整仅在我移动鼠标时才有效的代码

Question

我的代码应该是正确的，但它只有在我移动鼠标时才起作用，即使我什至没有设置鼠标也是如此。代码应该绘制移动的同心圆。

我什至尝试过屏蔽鼠标，但还是不行

import pygame
import math
import time
pygame.init()
screen = pygame.display.set_mode([800,600])
black = (0,0,0)
keep_going = True

white = (255,255,255)
freq = 10
num_circles = 0
radius = 0

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


        radius = radius + 1
        num_circles = math.ceil(radius / freq)
        screen.fill(white)

        radiusMax = num_circles * freq

        pace = freq / radiusMax


        for y in range(num_circles, 1, -1):

            radiusY = int(((pace * (num_circles - y)) + pace) * radiusMax) + (radius % freq)

            pygame.draw.circle(screen, black,(400, 300), radiusY, 1)

        pygame.display.update()           
pygame.quit()

我想知道为什么我会遇到这种错误，如何解决，如果不可能，可能的解决方案。

Answer 1

问题是因为你在事件循环中执行了所有代码。事件循环中的代码仅在事件发生时执行，例如鼠标移动 (pygame.MOUSEMOTION)。

在主循环而不是事件循环中绘制，解决问题：

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

    #<--
    #<--
    #while input() != "quit":
    #for x in range(1): #importante
    raggio = raggio + 1
    num_cerchi = math.ceil(raggio / freq)
    screen.fill(white)

    raggioMax = num_cerchi * freq

    passo = freq / raggioMax
    #time.sleep(5)

    for y in range(num_cerchi, 1, -1):
    # 1, -1

        raggioY = int(((passo * (num_cerchi - y)) + passo) * raggioMax) + (raggio % freq)

        pygame.draw.circle(screen, black,(400, 300), raggioY, 1)

        #raggio = raggio+1 #importante
    clock.tick(60)
    pygame.display.update()           
pygame.quit()

如何调整仅在我移动鼠标时才有效的代码

How adjust code that works only if I move the mouse

python

mouse

pygame