用python一起来看流星雨，,　　源代码如下（遇上

用python一起来看流星雨，,　　源代码如下（遇上

　　源代码如下（遇上篇烟花代码几乎一样，参数值稍微不一样）：

# -*- coding: utf-8 -*-# Nolaimport tkinter as tkfrom PIL import Image, ImageTkfrom time import time, sleepfrom random import choice, uniform,randintfrom math import sin, cos, radians# # 初始化tkinter 创建根部件 必须在创建其他部件之前创建 且只有一个# root = tk.Tk()# # Label部件# w = tk.Label(root, text="Hello Tkinter!")# # pack告诉tkinter调整窗口大小适应所用的小部件# w.pack()# root.mainloop()# 模拟重力GRAVITY = 0.05colors = [‘red‘, ‘blue‘, ‘pink‘, ‘white‘, ‘green‘, ‘orange‘, ‘purple‘, ‘seagreen‘, ‘indigo‘, ‘cornflowerblue‘]class Part(object):    """    particles 类    粒子在空中随机生成，变成一个圈，下坠，消失    """    def __init__(self, cv, idx, total, explosion_speed, x=0., y=0., vx=0., vy=0., size=2., color=‘red‘, lifespan=2, **kwargs):        """        :param cv: 画布        :param idx: 粒子的id        :param total: 总数        :param explosion_speed: 粒子初始速度        :param x: 粒子的横坐标        :param y: 粒子的纵坐标        :param vx: 粒子在x轴上的变化速度        :param vy: 粒子在y轴上的变化速度        :param size: 大小        :param color: 颜色        :param lifespan: 最高存在时长        :param 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):        """        粒子运动函数，膨胀        :param dt:        :return:        """        self.age += dt        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.vy = move_y / (float(dt)*1000)            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))            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:            self.cv.delete(self.cid)            self.cid = None    def alive(self):        """        检查粒子是否在最高存在时长内        :return: bool        """        return self.age <= 1.2    def expand(self):        """        定义膨胀效果时间帧        :return: bool        """        return self.age <= self.lifespandef simulate(cv):    """    循环调用保持不停    :param cv: 画布    :return:    """    numb_explode = randint(6, 10)    wait_time = randint(10, 100)    explode_points = []    t = time()    # 为所有模拟烟花绽放的全部粒子创建一个列表    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)  # 随机生成一个0.5-3之间的实数        color = choice(colors)        explosion_speed = uniform(0.2, 1)        total_particals = randint(5, 50)        for i in range(1, total_particals):            r = Part(cv, idx=1, total=total_particals, 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)    # 设置每个粒子没0.01秒更新状态  生命周期1.8秒  1.6秒存活（1.2秒绽放，0.4秒坠落，0.2秒移除）    total_time = .0    # 在1.8秒时间帧内保持更新    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    :param ignore:    :return:    """    global root    root.quit()if __name__ == ‘__main__‘:    # 初始化tkinter 创建根部件    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, 600, fill=‘black‘)    # 使用背景图片    # image = Image.open(‘./image.png‘)    # photo = ImageTk.PhotoImage(image)    # cv.create_image(0, 0, image=photo, anchor=‘nw‘)    cv.pack()    root.protocol(‘WM_DELETE_WINDOW‘, close)    # 1秒后开始条约simulate()    root.after(100, simulate, cv)    root.mainloop()

用python一起来看流星雨