明天是元旦，小张在这里先提前祝大家元旦快乐~，本篇文章，带大家用 Python 制作一个炫酷烟花秀，来迎接即将到来的元旦佳节。开始之前先看一下最终效果
环境介绍：
语言：Python；
库：Pygame；
原理介绍
在介绍代码之前，先介绍下 Pygame 绘制烟花的基本原理，烟花从发射到绽放一共分为三个阶段：
1，发射阶段：在这一阶段烟花的形状是线性向上，通过设定一组大小不同、颜色不同的点来模拟“向上发射” 的运动运动，运动过程中 5个点被赋予不同大小的加速度，随着时间推移，后面的点会赶上前面的点，最终所有点会汇聚在一起，处于 绽放准备阶段；
2，烟花绽放：烟花绽放这个阶段，是由一个点分散多个点向不同方向发散，并且每个点的移动轨迹可需要被记录，目的是为了追踪整个绽放轨迹。
3，烟花凋零，此阶段负责描绘绽放后烟花的效果，绽放后的烟花，而在每一时刻点的下降速度和亮度（代码中也叫透明度）是不一样的，因此在代码里，将烟花绽放后将每个点赋予两个属性：分别为重力向量和生命周期，来模拟烟花在不同时期时不同的展现效果，
代码实操
代码部分将烟花封装为三个类：
Firework : 烟花整体；
Particle：烟花粒子（包含轨迹）
Trail：烟花轨迹，本质上是一个点 。
三个类之间的关系为：一个Firework 由多个 Particle 构成，而一个 Particle 由多个 Trail 构成
首先设置全局变量，例如重力向量，窗口大小，Trail 的颜色列表（多为灰色或白色）以及不同状态下 Trail 之间间隔
gravity = vector(0, 0.3) DISPLAY_WIDTH = DISPLAY_HEIGHT = 800 trail_colours = [(45, 45, 45), (60, 60, 60), (75, 75, 75), (125, 125, 125), (150, 150, 150)] dynamic_offset = 1 static_offset = 3
创建 Trail 类，定义 show 方法绘制轨迹 、get_pos 实时获取轨迹坐标
class Trail: def __init__(self, n, size, dynamic): self.pos_in_line = n self.pos = vector(-10, -10) self.dynamic = dynamic if self.dynamic: self.colour = trail_colours[n] self.size = int(size - n / 2) else: self.colour = (255, 255, 200) self.size = size - 2 if self.size < 0: self.size = 0 def get_pos(self, x, y): self.pos = vector(x, y) def show(self, win): pygame.draw.circle(win, self.colour, (int(self.pos.x), int(self.pos.y)), self.size)
Particle 类核心代码
class Particle: def __init__(self, x, y, firework, colour): self.firework = firework self.pos = vector(x, y) self.origin = vector(x, y) self.radius = 20 self.remove = False self.explosion_radius = randint(5, 18) self.life = 0 self.acc = vector(0, 0) # trail variables self.trails = [] # stores the particles trail objects self.prev_posx = [-10] * 10 # stores the 10 last positions self.prev_posy = [-10] * 10 # stores the 10 last positions if self.firework: self.vel = vector(0, -randint(17, 20)) self.size = 5 self.colour = colour for i in range(5): self.trails.append(Trail(i, self.size, True)) else: self.vel = vector(uniform(-1, 1), uniform(-1, 1)) self.vel.x *= randint(7, self.explosion_radius + 2) self.vel.y *= randint(7, self.explosion_radius + 2) # 向量 self.size = randint(2, 4) self.colour = choice(colour) # 5 个 tails总计 for i in range(5): self.trails.append(Trail(i, self.size, False)) def apply_force(self, force): self.acc += force def move(self): if not self.firework: self.vel.x *= 0.8 self.vel.y *= 0.8 self.vel += self.acc self.pos += self.vel self.acc *= 0 if self.life == 0 and not self.firework: # check if particle is outside explosion radius distance = math.sqrt((self.pos.x - self.origin.x) ** 2 + (self.pos.y - self.origin.y) ** 2) if distance > self.explosion_radius: self.remove = True self.decay() self.trail_update() self.life += 1 def show(self, win): pygame.draw.circle(win, (self.colour[0], self.colour[1], self.colour[2], 0), (int(self.pos.x), int(self.pos.y)), self.size) def decay(self): # random decay of the particles if 50 > self.life > 10: # early stage their is a small chance of decay ran = randint(0, 30) if ran == 0: self.remove = True elif self.life > 50: ran = randint(0, 5) if ran == 0: self.remove = True
Firework 类核心代码
class Firework: def __init__(self): # 随机颜色 self.colour = (randint(0, 255), randint(0, 255), randint(0, 255)) self.colours = ( (randint(0, 255), randint(0, 255), randint(0, 255)), (randint(0, 255), randint(0, 255), randint(0, 255)), (randint(0, 255), randint(0, 255), randint(0, 255))) self.firework = Particle(randint(0, DISPLAY_WIDTH), DISPLAY_HEIGHT, True, self.colour) # Creates the firework particle self.exploded = False self.particles = [] self.min_max_particles = vector(100, 225) def update(self, win): # called every frame if not self.exploded: self.firework.apply_force(gravity) self.firework.move() for tf in self.firework.trails: tf.show(win) self.show(win) if self.firework.vel.y >= 0: self.exploded = True self.explode() else: for particle in self.particles: particle.apply_force(vector(gravity.x + uniform(-1, 1) / 20, gravity.y / 2 + (randint(1, 8) / 100))) particle.move() for t in particle.trails: t.show(win) particle.show(win) def remove(self): if self.exploded: for p in self.particles: if p.remove is True: self.particles.remove(p) if len(self.particles) == 0: return True else: return False
最后，写一个 main 方法来对 pygame 环境进行初始化，例如背景图片，文字，设置页面刷新间隔，程序中设置的每 60ms 刷新一次。
pygame.display.set_caption("Fireworks in Pygame") # 标题 background = pygame.image.load("img/1.png") # 背景 myfont = pygame.font.Font("img/simkai.ttf",80) myfont1 = pygame.font.Font("img/simkai.ttf", 30) testsurface = myfont.render("元旦快乐",False,(255,255,255)) testsurface1 = myfont1.render("By:小张Python", False, (255, 255, 255)) # pygame.image.load("") win = pygame.display.set_mode((DISPLAY_WIDTH, DISPLAY_HEIGHT)) # win.blit(background) clock = pygame.time.Clock() fireworks = [Firework() for i in range(2)] # create the first fireworks running = True while running: clock.tick(60) win.fill((20, 20, 30)) # draw background win.blit(background,(0,0)) win.blit(testsurface,(200,200)) win.blit(testsurface1, (300,200)) if randint(0, 20) == 1: # create new firework fireworks.append(Firework()) update(win, fireworks)
另外程序中会对你的按键命令进行监控：
- 当按下键 1时 ，会立即生成一个新的 “烟花”；
- 当按下键 2时，会同时生成 10 个 “烟花”
for event in pygame.event.get(): if event.type == pygame.QUIT: running = False if event.type == pygame.KEYDOWN: # Change game speed with number keys if event.key == pygame.K_1: # 按下 1 fireworks.append(Firework()) if event.key == pygame.K_2: # 按下 2 加入10个烟花 for i in range(10): fireworks.append(Firework())
总的来说，整个小案例的代码量不算很多，一共250行左右，但案例中涉及到较为复杂的绘制逻辑和抽象的类之间的封装关系，因此大家理解代码相对会需要耗费点时间。
小结
写到这里，本篇文章算基本结束了，主要介绍就是如何用 Pygame 来模拟一个烟花绽放过程，核心内容大致两点：第一，如何用绘制点的方式来模拟烟花绽放运动轨迹；第二 介绍Pygame 一些基础用法：替换背景，绘制文字，更新状态等功能
