我当前正在创建一个程序，其中一个圆圈将向左移动，停留3秒钟，然后向屏幕右侧移动。但是，当尝试在此处实施此解决方案时：In PyGame, how to move an image every 3 seconds without using the sleep function?，它不起作用。如果有人可以告诉我我在做什么，我将不胜感激。
这是我的代码：
import pygame, sys, time, random
from pygame.locals import *
currentPosition = [300, 368]
def moveLeft():
currentPosition[0] -= 1
def moveRight():
currentPosition[0] += 1
pygame.init()
windowCalibration = pygame.display.set_mode((0,0))
WHITE = (255, 255, 255)
windowCalibration.fill(WHITE)
pygame.display.set_caption("Eye calibration")
pygame.draw.circle(windowCalibration, (0,0,0), currentPosition, 10)
done = False
circleIsIdle = True
clock = pygame.time.Clock()
time_counter = 0
def stopCircle():
circleIsIdle = True
while circleIsIdle:
time_counter = clock.tick()
if time_counter > 3000:
time_counter = 0
circleIsIdle = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
done = True
while currentPosition[0] >= 10:
moveLeft()
windowCalibration.fill(WHITE)
pygame.draw.circle(windowCalibration, (0,0,0), currentPosition, 10)
pygame.display.update()
stopCircle()
while currentPosition[0] <= 1350:
moveRight()
windowCalibration.fill(WHITE)
pygame.draw.circle(windowCalibration, (0,0,0), currentPosition, 10)
pygame.display.update()
stopCircle()
done = True
答案 0 :(得分：1)
在while not done内，您不应该使用其他while来花费更长的时间。它会停止while not done，并且无法检查是否按了ESC等。
您应该使用pygame.time.get_ticks()来获取当前时间，并使用它来控制哪个元素移动或绘制。
我还使用state来查看我是向左还是向右移动，还是等到向左或向右移动。这样，我可以做不同的事情-我可以移动或不移动，我可以绘制或不绘制（即，如果我有按钮“ Pause”，我可以使用state_pause来绘制或不绘制该按钮）。
此代码始终运行while not done，因此您始终可以使用ESC退出。即使第一个圆圈正在等待，您也可以移动第二个圆圈。
import pygame
# --- constants ---
WHITE = (255, 255, 255)
BLACK = ( 0, 0, 0)
# --- classes ---
# empty
# --- functions ---
def moveLeft():
currentPosition[0] -= 1
def moveRight():
currentPosition[0] += 1
# --- main ---
pygame.init()
windowCalibration = pygame.display.set_mode((0,0))
pygame.display.set_caption("Eye calibration")
currentPosition = [300, 368]
state = 'move_left'
wait_to = 0
done = False
while not done:
# --- events ---
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
done = True
# --- moves ---
if state == 'move_left':
if currentPosition[0] >= 10:
moveLeft()
else:
state = 'wait_before_move_right'
wait_to = pygame.time.get_ticks() + 3000
elif state == 'move_right':
if currentPosition[0] <= 1350:
moveRight()
else:
state = 'wait_before_move_left'
wait_to = pygame.time.get_ticks() + 3000
elif state == 'wait_before_move_right':
current_time = pygame.time.get_ticks()
if current_time > wait_to:
state = 'move_right'
elif state == 'wait_before_move_left':
current_time = pygame.time.get_ticks()
if current_time > wait_to:
state = 'move_left'
# --- draws ----
windowCalibration.fill(WHITE)
pygame.draw.circle(windowCalibration, BLACK, currentPosition, 10)
pygame.display.update()
# --- end ---
pygame.quit()
编辑：该代码可同时移动3个圆圈，它们会等到它们改变方向后才停止其他圆圈，您可以随时使用ESC。
import pygame
# --- constants ---
WHITE = (255, 255, 255)
BLACK = ( 0, 0, 0)
RED = (255, 0, 0)
GREEN = ( 0, 255, 0)
BLUE = ( 0, 0, 255)
# --- classes ---
# empty
# --- functions ---
# empty
# --- main ---
pygame.init()
windowCalibration = pygame.display.set_mode((0,0))
pygame.display.set_caption("Eye calibration")
circles = [
{'pos': [300, 368], 'speed': 1, 'state': 'move_left', 'wait_to': 0, 'color': RED},
{'pos': [300, 268], 'speed': 10, 'state': 'move_right', 'wait_to': 0, 'color': GREEN},
{'pos': [300, 168], 'speed': 30, 'state': 'move_right', 'wait_to': 0, 'color': BLUE},
]
done = False
while not done:
# --- events ---
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
done = True
# --- moves ---
current_time = pygame.time.get_ticks()
for circle in circles:
if circle['state'] == 'move_left':
if circle['pos'][0] >= 10:
circle['pos'][0] -= circle['speed']
else:
circle['pos'][0] = 10
circle['state'] = 'wait_before_move_right'
circle['wait_to'] = pygame.time.get_ticks() + 3000
elif circle['state'] == 'move_right':
if circle['pos'][0] <= 1350:
circle['pos'][0] += circle['speed']
else:
circle['pos'][0] = 1350
circle['state'] = 'wait_before_move_left'
circle['wait_to'] = pygame.time.get_ticks() + 3000
elif circle['state'] == 'wait_before_move_right':
if current_time > circle['wait_to']:
circle['state'] = 'move_right'
elif circle['state'] == 'wait_before_move_left':
if current_time > circle['wait_to']:
circle['state'] = 'move_left'
# --- draws ----
windowCalibration.fill(WHITE)
for circle in circles:
pygame.draw.circle(windowCalibration, circle['color'], circle['pos'], 10)
pygame.display.update()
# --- end ---
pygame.quit()