import turtle
import math
import random
import time


Tree = turtle.Turtle()


def tree(x, y, a, old_width):
    width = 0
    if old_width < 8:
        return
    x1 = round(x + old_width * math.cos(a))
    y1 = round(y + old_width * math.sin(a))
    if old_width > 100:
        width = 100
    else:
        width = old_width
    if width < 40:  # если это корень, а не ствол
        if random.random() > 0.5:
            Tree.color("yellow")
        else:
            Tree.color("green")
        for i in range(3):
            Tree.setpos(x+i, y)
            Tree.goto(x1, y1)
    else:
        Tree.color("brown")
        for i in range(round(width/6)):
            Tree.up()
            Tree.setpos(x+i-round(width/12), y)
            Tree.down()
            Tree.goto(x1, y1)
    for i in range(9-random.randint(1, 9)):
        s = random.randint(1, old_width - round(old_width / 6)) + round(old_width / 6)
        a1 = a + 1.6 * (0.5-random.random())
        x1 = round(x+s*math.cos(a))
        y1 = round(y+s*math.sin(a))
        tree(x1, y1, a1, width-5-random.randint(0, 30))


def main():
    tree(0, 0, math.pi/2, 200)
    time.sleep(50)


if __name__ == "__main__":
    main()