何佳俊python全域變數global和判斷if
from tkinter import * #或者import tkinter as tk
import math
tk = Tk() #建構視窗名為tk
tk.geometry('1200x400')#視窗 寬1200像素
tk.title("何佳俊python tkinter三角函數")
canvas = Canvas(tk, width=1200, height=400, bg='black')
canvas.grid(row=0,column=0,padx=5,pady=5,columnspan=3)
delay=1 # milliseconds, 1/1000秒
x1,y1,z1=0,200,10#python特徵,多變數=對等值
h=190 #上下範圍,相當於數學1到-1
def LH():
global x1, y1, z1#global全球,local當地
x2 = x1 + 1 #換到下個+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='green',width=10)
L2=canvas.create_line(x1,z1,x2,z2,fill='red',width=10)
if (x2 < 600 ): #沒有超過, 記得將 "小於" 改成運算
x1,y1,z1=x2,y2,z2#下一個起點是現在終點
canvas.after(delay,LH)#每隔delay執行
else:
canvas.delete("all")
x1,y1,z1=0,200,10#下一個起點是回到原點
canvas.after(delay,LH)#return沒你的事,滾回你老家
LH() #執行LauHou老猴
tk.mainloop()

期末考, 沒用border第一列不能留space.https://hejaijun.blogspot.com/2026/01/python.html
回覆刪除1117.沒有用pre.https://hejaijun.blogspot.com/2025/11/pythontkinterreturn.html
sin cos不能執行。https://hejaijun.blogspot.com/2025/12/javascriptvs-code.html
https://hejaijun.blogspot.com/2025/12/ifelif.html
https://hejaijun.blogspot.com/2025/12/pythonglobalif.html