图形学 Python 绘制金刚石图案

import turtle
import math
import time
def draw(x,y,r):
    turtle.penup()
    turtle.goto(x,y)
    turtle.pendown()
    turtle.circle(r)
def join(x,y,ex,ey):
    turtle.penup()
    turtle.goto(x,y)
    turtle.pendown()
    turtle.goto(ex,ey)

if __name__ == '__main__':
    rid = int(turtle.textinput('输入','输入半径'))

    turtle.setup(width=1000, height=1000)
    turtle.speed(50)
    #draw(0,0,300)
    xlist=[]
    ylist=[]

    for i in range(0,30):
        xlist.append(rid*math.cos(math.pi/15*i));
        ylist.append(rid*math.sin(math.pi/15*i));
        #print(12*i,' R == ',i*15);
        draw(0,(i+1)*-(rid/30),(i+1)*(rid/30));
    for i in range(0,xlist.__len__()):
        for j in range(0,xlist.__len__()):
            join(xlist[i],ylist[i],xlist[j],ylist[j])
time.sleep(20)