Python使用Turtle绘制分形树

2020/02/25

Python使用Turtle绘制分形树

效果如下：

Code：

'''
    作者：清扬
    功能：利用递归绘制分型树
    版本：1.0
    日期：2020/02/25
'''

import turtle

def draw_branch(branch_length):
    '''
        绘制分型树
        :param branch_length:
        :return:
    '''
    if branch_length > 5:
        if branch_length > 10:
            turtle.pensize(10)
            turtle.color('brown')
        else:
            turtle.pensize(5)
            turtle.color('green')

        # 绘制右侧树枝
        turtle.forward(branch_length)


        print('向前',branch_length)
        turtle.right(20)
        print('右转 20')
        draw_branch(branch_length-15)

        # 绘制左侧树枝
        turtle.left(40)
        print('左转 40')
        draw_branch(branch_length-15)

        #返回之前的树枝上
        print('右转 20')
        turtle.right(20)

        turtle.penup()
        turtle.backward(branch_length)
        turtle.pendown()

        print('向后',branch_length)

def main():
    '''
        主函数
    '''
    turtle.left(90)
    turtle.penup()
    turtle.backward(200)
    turtle.pendown()
    turtle.color('brown')
    print('左转 90')
    turtle.speed(5000)
    draw_branch(100);
    turtle.exitonclick() 

if __name__ == '__main__':
    main()