tkinter之星光旋转2D向量与面向对象编程适合初三学过三角函数以上同学

"""
   tkinter星光旋转.py
   面向对象编程案例, 本程序适合于初三以上学习过三角函数的学生学习,
   作者: 李兴球  2022/9/16
"""
import time
import math
import random
from tkinter import *

class Vector2D(tuple):
    """2D向量类"""    
    def __new__(cls, x, y):
        return tuple.__new__(cls, (x, y))
    
    def __sub__(self, other):
        return Vec2D(self[0]-other[0], self[1]-other[1])
    
    def rotate(self,angle=1):
        perp = Vector2D(-self[1], self[0])
        angle = angle * math.pi / 180.0
        c, s = math.cos(angle), math.sin(angle)
        return Vector2D(self[0]*c+perp[0]*s, self[1]*c+perp[1]*s)    
        
class Point:   # 表示一个点的类
    def __init__(self,x,y,canvas):
        self.x = x
        self.y = y
        self.cv = canvas
        # 创建一个'实体'点
        self.item = cv.create_oval(x,y,x+1,y+1,fill='white')

    def rotate(self,center=(0,0),degree=-1):
        x1,y1,x2,y2 = self.cv.coords(self.item)
        points = [(x1,y1),(x2,y2)]
        points= [Vector2D(x,y) for x,y in points] # 转换为向量
        points = [C-center for C in points]
        points = [C.rotate(degree) for C in points]
        points = [C+center for C in points]
        points = [points[0][0],points[0][1],points[1][0],points[1][1]]
        self.cv.coords(self.item,points)

if __name__ == '__main__':
    
    root = Tk()
    cv = Canvas(root,bg='black',width=800,height=800)
    cv.pack()

    # 创建2000个点
    points = [(random.randint(-800,800),random.randint(-800,800))
              for i in range(2000)]

    dots = [Point(x,y,cv) for x,y in points] # 实例化2000个点

    while True:
        [d.rotate() for d in dots]
        cv.update()