【注1】采用线动成面的原理，使用一维线去绘制二维平面图形！

【注2】密集的描竖直线即可！

1.LineToFaceCos.py

import turtle as tle
import math
tle.speed(0)
tle.delay(0)
tle.pensize(1)
tle.pencolor("blue")
tle.tracer(True)
#tle.tracer(False)
col = ["blue","green"]
def subline(x,coll,y=[]):
    tle.pencolor(coll)
    tle.penup()
    tle.goto(x,-220)
    tle.pendown()
    for i in y:
        tle.goto(x,i-2)
        tle.penup()
        tle.goto(x,i+2)
        tle.pendown()
    tle.goto(x,220)
k = 0
i = -150
while(i<=150):
    if k == 2:
        k = 0
    i = i + 1
    y = []
    y.append(70*math.cos(0.06*i+4)+20)
    subline(i,col[k],y)
    k = k + 1
tle.done()

2.结果示例