[英]Pressing a key creates a loop until you press another key
I'm creating a Snake game in Python. After pressing a direction key the snake will move in that direction at a slow pace until the user presses another key.我正在 Python 中创建一个贪吃蛇游戏。按下方向键后,蛇将以缓慢的速度朝该方向移动,直到用户按下另一个键。 I was able to make the snake move after pressing a key, but I could not stop it by pressing another key: (I'm using a pygame)按下一个键后我能够让蛇移动,但我无法通过按下另一个键来停止它:(我正在使用 pygame)
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
while i==False:
time.sleep(0.2)
X_had1=X_had1 - 1
#Print operation
if event.type == pygame.KEYDOWN:
if event.key != pygame.K_LEFT:
i=True
No. Never try to control the application with an additional loop in the application loop.不可以。切勿尝试在应用程序循环中使用附加循环来控制应用程序。 You have the application loop use it.您让应用程序循环使用它。 Add a variable that controls direction and change the value of the variable when you press a key.添加一个控制方向的变量,并在按下某个键时更改变量的值。 Use the direction
to change the position ( X_had1
, Y_had1
):使用direction
改变 position ( X_had1
, Y_had1
):
direction = None
speed = 1
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
direction = (-1, 0)
if event.key == pygame.K_RIGHT:
direction = (1, 0)
if event.key == pygame.K_UP:
direction = (0, -1)
if event.key == pygame.K_DOWN:
direction = (0, 1)
if direction:
X_had1 += direction[0] * speed
Y_had1 += direction[1] * speed
This is what I did in the end-这就是我最后所做的——
if event.type == pygame.KEYDOWN:
x=event.key
y=x
print(x)
while b == False:
if y1 != 275:
if y == 276:
hadX1=hadX1 -1
IMAGEsnake=r"C:\תמונות פיתון\ראש הנחש קטן שמאלה.png"
y1=y
print(nums)
b=True
elif y1==275:
if y == 276:
y=275
if y1 != 273:
if y == 274:
hadY1=hadY1 + 1
IMAGEsnake=r"C:\תמונות פיתון\ראש הנחש קטן למטה.png"
y1=y
print(nums)
b=True
elif y1==273:
if y == 274:
y=273
if y1 !=276:
if y == 275:
hadX1=hadX1 + 1
IMAGEsnake=r"C:\תמונות פיתון\ראש הנחש קטן ימינה.png"
y1=y
print(nums)
b=True
elif y1==276:
if y == 275:
y=276
if y1 != 274:
if y == 273:
hadY1=hadY1 - 1
IMAGEsnake=r"C:\תמונות פיתון\ראש הנחש קטן למעלה.png"
y1=y
print(nums)
b=True
elif y1==274:
if y == 273:
y=274
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