如何用python画烟花

互联网 20-10-21

用python画烟花的方法：首先创建一个所有粒子同时扩大的二维列表；然后实现粒子范围扩大，以自由落体坠落；接着移除超过最高时长的粒子；最后循环调用保持不停。

用python画烟花的方法：

# -*- coding: utf-8 -*- # Nola 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 # 模拟重力 GRAVITY = 0.05 # 颜色选项（随机或者按顺序） colors = ['red', 'blue', 'yellow', 'white', 'green', 'orange', 'purple', 'seagreen', 'indigo', 'cornflowerblue'] ''' particles 类 粒子在空中随机生成随机，变成一个圈、下坠、消失 属性:     - id: 粒子的id     - x, y: 粒子的坐标     - vx, vy: 在坐标的变化速度     - total: 总数     - age: 粒子存在的时长     - color: 颜色     - cv: 画布     - lifespan: 最高存在时长 ''' class Particle:     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         self.x = x         self.y = y         self.initial_speed = explosion_speed         self.vx = vx         self.vy = vy         self.total = total         self.age = 0         self.color = color         self.cv = cv         self.cid = self.cv.create_oval(             x - size, y - size, x + size,             y + size, fill=self.color)         self.lifespan = lifespan     def update(self, dt):         self.age += dt         # 粒子范围扩大         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)         # 以自由落体坠落         elif self.alive():             move_x = cos(radians(self.id * 360 / self.total))             # we technically don't need to update x, y because move will do the job             self.cv.move(self.cid, self.vx + move_x, self.vy + GRAVITY * dt)             self.vy += GRAVITY * dt         # 移除超过最高时长的粒子         elif self.cid is not None:             cv.delete(self.cid)             self.cid = None     # 扩大的时间     def expand (self):         return self.age <= 1.2     # 粒子是否在最高存在时长内     def alive(self):         return self.age <= self.lifespan ''' 循环调用保持不停 ''' def simulate(cv):     t = time()     explode_points = []     wait_time = randint(10, 100)     numb_explode = randint(6, 10)     # 创建一个所有粒子同时扩大的二维列表     for point in range(numb_explode):         objects = []         x_cordi = randint(50, 550)         y_cordi = randint(50, 150)         speed = uniform(0.5, 1.5)         size = uniform(1, 3)         color = choice(colors)         explosion_speed = uniform(0.2, 1)         total_particles = randint(10, 50)         for i in range(1, total_particles):             r = Particle(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))             objects.append(r)         explode_points.append(objects)     total_time = .0     # 1.8s内一直扩大     while total_time < 1.8:         sleep(0.01)         tnew = time()         t, dt = tnew, tnew - t         for point in explode_points:             for item in point:                 item.update(dt)         cv.update()         total_time += dt     # 循环调用     root.after(wait_time, simulate, cv) def close(*ignore):     """退出程序、关闭窗口"""     global root     root.quit() if __name__ == '__main__':     root = tk.Tk()     cv = tk.Canvas(root, height=400, width=600)     # 绘制一个黑色背景     cv.create_rectangle(0, 0, 600, 400, fill='black')     # cv = tk.Canvas(root, height=400, width=600)     # # 选一个好看的背景会让效果更惊艳！     # image = Image.open("./image.jpg")     # photo = ImageTk.PhotoImage(image)     #     # cv.create_image(0, 0, image=photo, anchor='nw')     cv.pack()     root.protocol("WM_DELETE_WINDOW", close)     root.after(100, simulate, cv)     root.mainloop()

实现效果图：