#实验四.py
import turtle
def koch(size, n):
if n == 0:
turtle.fd(size)
else:
for angle in [0, 60, -120, 60]:
turtle.left(angle)
koch(size/3, n-1)
def main():
turtle.setup(800,400)
turtle.seth(0)
turtle.pencolor("green")#颜色
turtle.speed(0) #控制绘制速度
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,1) # 1阶科赫曲线长度,阶数
turtle.pencolor("red")#颜色
turtle.seth(60)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,2) # 2阶科赫曲线长度,阶数
turtle.pencolor("yellow")#颜色
turtle.seth(120)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,3) # 3阶科赫曲线长度,阶数
turtle.pencolor("blue")#颜色
turtle.seth(180)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,4) # 4阶科赫曲线长度,阶数
turtle.pencolor("purple")#颜色
turtle.seth(240)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,5) # 5阶科赫曲线长度,阶数
turtle.pencolor("gold")#颜色
turtle.seth(-60)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,6) # 6阶科赫曲线长度,阶数
turtle.hideturtle()
main()
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