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в Гостях у Сурка
Asked:2020-09-01 21:37:02 +0000 UTC2020-09-01 21:37:02 +0000 UTC

为什么触摸线Python时圆圈不会停止

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为什么在这段代码中，触摸线时圆圈不会停止？如果有人知道如何在接触地面时停下来，请写信。

import pygame

pygame.init()

FPS = 30
 
x = 300
y = 200

xL = 200
xL2 = 400
yL = 300

sc = pygame.display.set_mode((600, 400))
clock = pygame.time.Clock()
pygame.display.update()

speedDown = 0 

while True:
    sc.fill((255,255,255))

    clock.tick(FPS)

    pygame.draw.circle(sc,(0,0,255),(x,y), 20, 0)
    pygame.draw.line(sc,(0,0,0),(xL,yL),(xL2,yL),5)

    for i in pygame.event.get():
        if i.type == pygame.QUIT:
            exit()
 
    keys = pygame.key.get_pressed()
    
    if y == yL:
       speedDown = 0
       y += 5
    else:
       speedDown += 1
       y += speedDown  

    pygame.display.update()
python

1 个回答

  1. Best Answer

    因为你检查了一次是否相等，然后圆圈向下，在下一次迭代中，检查再次进入它else，圆圈继续向下。要让它在线上“冻结”，你可以这样写：

    import pygame

pygame.init()

FPS = 30
 
x = 300
y = 200

xL = 200
xL2 = 400
yL = 300

sc = pygame.display.set_mode((600, 400))
clock = pygame.time.Clock()
pygame.display.update()

speedDown = 0 

while True:
    sc.fill((255,255,255))

    clock.tick(FPS)

    pygame.draw.circle(sc,(0,0,255),(x,y), 20, 0)
    pygame.draw.line(sc,(0,0,0),(xL,yL),(xL2,yL),5)

    for i in pygame.event.get():
        if i.type == pygame.QUIT:
            exit()
 
    keys = pygame.key.get_pressed()
    
    if y > yL:
       y -= 1
    else:
       y += 1  

    pygame.display.update()

    测试https://repl.it/repls/VirtuousThirstyLint

    • 0

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