python – 在Pygame中每隔几秒移动一个对象

pygame.time.set_timer()
repeatedly create an event on the event queue
set_timer(eventid,milliseconds) -> None

Set an event type to appear on the event queue every given number of milliseconds

这是一个简单,完整的例子.注意敌人每隔1000ms横向移动一次,每3500ms向下移动一次,你可以每450ms射击一次(所有使用事件).

import pygame

# you'll be able to shoot every 450ms
RELOAD_SPEED = 450

# the foes move every 1000ms sideways and every 3500ms down
MOVE_SIDE = 1000
MOVE_DOWN = 3500

screen = pygame.display.set_mode((300,200))
clock = pygame.time.Clock()

pygame.display.set_caption("Micro Invader")

# create a bunch of events 
move_side_event = pygame.USEREVENT + 1
move_down_event = pygame.USEREVENT + 2
reloaded_event  = pygame.USEREVENT + 3

move_left,reloaded = True,True

invaders,colors,shots = [],[],[]
for x in range(15,300,15):
    for y in range(10,100,15):
        invaders.append(pygame.Rect(x,y,7,7))
        colors.append(((x * 0.7) % 256,(y * 2.4) % 256))

# set timer for the movement events
pygame.time.set_timer(move_side_event,MOVE_SIDE)
pygame.time.set_timer(move_down_event,MOVE_DOWN)

player = pygame.Rect(150,180,10,7)

while True:
    clock.tick(40)
    if pygame.event.get(pygame.QUIT): break
    for e in pygame.event.get():
        if e.type == move_side_event:
            for invader in invaders:
                invader.move_ip((-10 if move_left else 10,0))
            move_left = not move_left
        elif e.type == move_down_event:
            for invader in invaders:
                invader.move_ip(0,10)
        elif e.type == reloaded_event:
            # when the reload timer runs out,reset it
            reloaded = True
            pygame.time.set_timer(reloaded_event,0)

    for shot in shots[:]:
        shot.move_ip((0,-4))
        if not screen.get_rect().contains(shot):
            shots.remove(shot)
        else:
            hit = False
            for invader in invaders[:]:
                if invader.colliderect(shot):
                    hit = True
                    i = invaders.index(invader)
                    del colors[i]
                    del invaders[i]
            if hit:
                shots.remove(shot)

    pressed = pygame.key.get_pressed()
    if pressed[pygame.K_LEFT]: player.move_ip((-4,0))
    if pressed[pygame.K_RIGHT]: player.move_ip((4,0))

    if pressed[pygame.K_SPACE]: 
        if reloaded:
            shots.append(player.copy())
            reloaded = False
            # when shooting,create a timeout of RELOAD_SPEED
            pygame.time.set_timer(reloaded_event,RELOAD_SPEED)

    player.clamp_ip(screen.get_rect())

    screen.fill((0,0))

    for invader,(a,b) in zip(invaders,colors): 
        pygame.draw.rect(screen,(150,a,b),invader)

    for shot in shots: 
        pygame.draw.rect(screen,(255,0),shot)

    pygame.draw.rect(screen,(180,180),player)    
    pygame.display.flip()