import math
from time import sleep
import tkinter as tk
root = tk.Tk()

def Y_pattern():
    canvas.delete("all")  # 清除画布
    canvas.create_line(20, 30, 80, 90, fill='red', width=2)  # 左臂
    canvas.create_line(140, 30, 80, 90, fill='red', width=2)  # 右臂
    canvas.create_line(80, 160, 80, 90, fill='red', width=2)  # 中心线



def Y_tree(depth, percent, left_angle, right_angle, start_point, angle, length, canvas):
    if depth == 0:
        return
    end_point = (start_point[0] + length * math.cos(math.radians(angle)),
                 start_point[1] - length * math.sin(math.radians(angle)))
    canvas.create_line(start_point, end_point, width=2)
    Y_tree(depth - 1, percent, left_angle, right_angle, end_point, angle + right_angle, length * percent,
           canvas)  # 画右枝
    Y_tree(depth - 1, percent, left_angle, right_angle, end_point, angle - left_angle, length * percent,
           canvas)  # 画左枝
    canvas.update()
    sleep(0.001)

if __name__ == '__main__':
    canvas = tk.Canvas(root, width=1200, height=1000)
    canvas.pack()
    finishLevel = 10
    treePercent = 0.7
    leftAngle = 60
    rightAngle = 60
    initPoint = (520, 600)
    initAngle = 90
    initLong = 160
    Y_tree(finishLevel, treePercent, leftAngle,rightAngle,initPoint,initAngle,initLong,canvas)