吳丞傑python tkinter三角函數

import math
from tkinter import *
tk = Tk()           
tk.geometry('1200x400')
tk.title("吳丞傑python tkinter三角函數")
canvas = Canvas(tk, width=1200, height=400, bg='PINK')
canvas.grid(row=0,column=0,padx=5,pady=5,columnspan=3)
delay=3 
x1,y1,z1=0,200,10
h=190      
def LH():
    global x1, y1, z1
    x2 = x1 + 1 
    y2=200 - h*math.sin(0.02*x2)
    z2=200 - h*math.cos(0.02*x2)
    L1=canvas.create_line(x1,y1,x2,y2,fill='BLUE',width=10)
    L2=canvas.create_line(x1,z1,x2,z2,fill='yellow',width=10)  
    if (x2 < 1200):
        x1,y1,z1=x2,y2,z2
        canvas.after(delay,LH)
    else:
        canvas.delete("all")
        x1,y1,z1=0,200,10
        canvas.after(delay,LH)
        
LH()            
tk.mainloop()