from turtle import *
from math import *
speed()
hideturtle()
x1 = -200
y1 = -200
x2 = 200
y2 = 180

for x in range(81):
    color(x*3, 20, 160)
    y1 = sin(x*0.2)*50 - 100
    penup()
    goto(x1, y1)
    pendown()
    goto(x2, y2)
    x1 = x1 + 5