使用 Pygame 使粒子连续生成

Question

我正在使用 pygame 开展一个学校项目，主要目标是让很多物体出现并随机移动。 所以我想让一些粒子产生并随机移动，我想出了这个。

import pygame, random

# -- Variables --

pygame.init()
clock = pygame.time.Clock()
fps_limit = 60.0

resx = 1600 
resy = 900
screen = pygame.display.set_mode([resx,resy])

# -- Classes --

class Particule():
    def __init__ (self,color,radius):
        pygame.sprite.Sprite.__init__(self)
        self.color = color
        self.radius = radius
        self.position_x = resx/2
        self.position_y = resy/2

    def update(self):
        pygame.draw.circle(screen, self.color, (self.position_x,self.position_y),self.radius)

    def random_movement(self):
        self.position_x += random.randint(0,10)
        self.position_y -= random.randint(0,5)

    def life(self):
        self.radius -= 1

# -- Objects --

particule1 = Particule((255,0,0),100)


# -- Game loop --

running = True
while running:
    clock.tick(fps_limit)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    screen.fill((0,0,0))

    particule1.update()
    particule1.random_movement()
    particule1.life()

    pygame.display.set_caption("Baguette")

    pygame.display.flip()   
pygame.quit()

我尝试做一些 while/if/for 循环，但只有一个 object 出现然后没有

Answer 1

为粒子创建一个列表：

particles = []

使用pygame.time.get_ticks()获取自pygame.init()以来的毫秒数。 定义第一个粒子必须出现的时间。 如果时间超过创建一个粒子并设置要创建下一个粒子的时间：

next_particle_time = 0

running = True
while running:
    # [...]

    current_time = pygame.time.get_ticks()
    if current_time > next_particle_time:
        particles.append(Particule((255,0,0), 100))         
        next_particle_time = current_time + 200    # 0.2 second interval

在循环中绘制和移动所有粒子：

running = True
while running:
    # [...]

    for p in particles[:]:
        p.update()
        p.random_movement()
        p.life()
        if p.radius < 1:
            particles.remove(p)

---

完整示例

import pygame, random

# -- Variables --
pygame.init()
clock = pygame.time.Clock()
fps_limit = 60.0
resx = 1600 
resy = 900
screen = pygame.display.set_mode([resx,resy])
pygame.display.set_caption("Baguette")

# -- Classes --
class Particule():
    def __init__ (self,color,radius):
        pygame.sprite.Sprite.__init__(self)
        self.color = color
        self.radius = radius
        self.position_x = random.randint(radius, 1600-radius)
        self.position_y = random.randint(radius, 900-radius)

    def update(self):
        pygame.draw.circle(screen, self.color, (self.position_x,self.position_y),self.radius)

    def random_movement(self):
        self.position_x += random.randint(-10,10)
        self.position_y -= random.randint(-5,5)

    def life(self):
        self.radius -= 1

# -- Objects --
particles = []
next_particle_time = 0

# -- Game loop --
running = True
while running:
    clock.tick(fps_limit)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    current_time = pygame.time.get_ticks()
    if current_time > next_particle_time:
        particles.append(Particule((255,0,0), 100))         
        next_particle_time = current_time + 200 # 0.2 second interval

    screen.fill((0,0,0))

    for p in particles[:]:
        p.update()
        p.random_movement()
        p.life()
        if p.radius < 1:
            particles.remove(p)
    print(len(particles))

    pygame.display.flip()   

pygame.quit()