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2021 已经接近尾声了，2022 即将到来，本文我们用 Python 送你一场跨年烟花秀。
我们用到的 Python 模块包括：tkinter、PIL、time、random、math，如果第三方模块没有装的话，pip install
一下即可，下面看一下代码实现。
导库
import tkinter as tk from PIL import Image, ImageTk from time import time,
sleep from random import choice, uniform, randint from math import sin, cos,
radians colors = ['red', 'blue', 'yellow', 'white', 'green', 'orange',
'purple', 'seagreen', 'indigo', 'cornflowerblue']
1 定义烟花类 class fireworks: def __init__(self, cv, idx, total,
explosion_speed, x=0., y=0., vx=0., vy=0., size=2., color='red', lifespan=2,
**kwargs): self.id = idx # 烟花绽放 x 轴 self.x = x
# 烟花绽放 x 轴 self.y = y self.initial_speed = explosion_speed
# 外放 x 轴速度 self.vx = vx # 外放 y 轴速度 self.vy = vy
# 绽放的粒子数 self.total = total # 已停留时间 self.age = 0
# 颜色 self.color = color # 画布 self.cv = cv
self.cid = self.cv.create_oval(x - size, y - size, x + size, y + size,
fill=self.color) self.lifespan = lifespan # 更新数据 def
update(self, dt): self.age += dt # 粒子膨胀 if self.alive()
and self.expand(): move_x = cos(radians(self.id * 360 /
self.total)) * self.initial_speed move_y = sin(radians(self.id *
360 / self.total)) * self.initial_speed self.cv.move(self.cid,
move_x, move_y) self.vx = move_x / (float(dt) * 1000) #
膨胀到最大下落 elif self.alive(): move_x = cos(radians(self.id *
360 / self.total)) self.cv.move(self.cid, self.vx + move_x, self.vy
+ 0.5 * dt) self.vy += 0.5 * dt # 过期移除 elif
self.cid is not None: cv.delete(self.cid) self.cid =
None # 定义膨胀效果的时间帧 def expand(self): return self.age <= 1.5
# 检查粒子是否仍在生命周期内 def alive(self): return self.age <= self.lifespan
燃放烟花 def ignite(cv): t = time() # 烟花列表 explode_points = []
wait_time = randint(10, 100) # 爆炸的个数 numb_explode = randint(6, 10)
for point in range(numb_explode): # 爆炸粒子列表 objects = []
# 爆炸 x 轴 x_cordi = randint(50, 550) # 爆炸 y 轴 y_cordi =
randint(50, 150) speed = uniform(0.5, 1.5) size = uniform(0.5,
3) color = choice(colors) # 爆炸的绽放速度 explosion_speed =
uniform(0.2, 1) # 爆炸的粒子数半径 total_particles = randint(10, 50)
for i in range(1, total_particles): r = fireworks(cv, idx=i,
total=total_particles, explosion_speed=explosion_speed, x=x_cordi, y=y_cordi,
vx=speed, vy=speed, color=color, size=size,
lifespan=uniform(0.6, 1.75)) # 添加进粒子列表里
objects.append(r) # 把粒子列表添加到烟花列表 explode_points.append(objects)
total_time = .0 # 在 1.8 秒时间帧内保持更新 while total_time < 1.8: #
让画面暂停 0.01s sleep(0.01) # 刷新时间 tnew = time() t,
dt = tnew, tnew - t # 遍历烟花列表 for point in explode_points:
# 遍历烟花里的粒子列表 for item in point: # 更新时间
item.update(dt) # 刷新页面 cv.update() total_time
+= dt root.after(wait_time, ignite, cv)
启动 if __name__ == "__main__": root = tk.Tk() # 绘制一个画布 cv =
tk.Canvas(root, height=400, width=600) # 背景图 image =
Image.open("bg.jpg") photo = ImageTk.PhotoImage(image) # 在画板上绘制一张图片
cv.create_image(0, 0, image=photo, anchor='nw') cv.pack()
root.protocol(close) root.after(100, ignite, cv) # 生成窗口
root.mainloop()
看一下效果：