python绘图-树

青旅半醒 2022-12-24 13:55 101阅读 0赞

from turtle import *
    from random import *
    from math import *
    
    def tree(n,l):
        pd()#下笔
        #阴影效果
        t = cos(radians(heading()+45))/8+0.25
        pencolor(t,t,t)
        pensize(n/3)
        forward(l)#画树枝
    
        if n>0:
            b = random()*15+10 #右分支偏转角度
            c = random()*15+10 #左分支偏转角度
            d = l*(random()*0.25+0.7) #下一个分支的长度
            #右转一定角度,画右分支
            right(b)
            tree(n-1,d)
            #左转一定角度，画左分支
            left(b+c)
            tree(n-1,d)
            #转回来
            right(c)
        else:
            #画叶子
            right(90)
            n=cos(radians(heading()-45))/4+0.5
            pencolor(n,n*0.8,n*0.8)
            circle(3)
            left(90)
            #添加0.3倍的飘落叶子
            if(random()>0.7):
                pu()
                #飘落
                t = heading()
                an = -40 +random()*40
                setheading(an)
                dis = int(800*random()*0.5 + 400*random()*0.3 + 200*random()*0.2)
                forward(dis)
                setheading(t)
                #画叶子
                pd()
                right(90)
                n = cos(radians(heading()-45))/4+0.5
                pencolor(n*0.5+0.5,0.4+n*0.4,0.4+n*0.4)
                circle(2)
                left(90)
                pu()
                #返回
                t=heading()
                setheading(an)
                backward(dis)
                setheading(t)
        pu()
        backward(l)#退回
    
    bgcolor(0.5,0.5,0.5)#背景色
    ht()#隐藏turtle
    speed(0)#速度 1-10渐进，0 最快
    #tracer(0,0) #隐藏绘画过程
    pu()#抬笔
    backward(100)
    left(90)#左转90度
    pu()#抬笔
    backward(300)#后退300
    tree(12,100)#递归7层
    done()