Answer
code
Work Step by Step
# 15.30 (Turtle: H-tree fractal) Rewrite the H-tree fractal in Exercise 15.29 using Turtle,
# as shown in Figure 15.16. Your program should prompt the user to enter the
# order and display the corresponding fractal for the order.
import turtle
# Draw H shapes with the specified order
def displayHShape(order, center, length):
if order >= 0:
p1 = [center[0] - length / 2, center[1] + length / 2]
p2 = [center[0] - length / 2, center[1] - length / 2]
p3 = [center[0] + length / 2, center[1] + length / 2]
p4 = [center[0] + length / 2, center[1] - length / 2]
# Draw an H shape
drawLine(center[0] - length / 2, center[1],
center[0] + length / 2, center[1])
drawLine(p1[0], p1[1], p2[0], p2[1])
drawLine(p3[0], p3[1], p4[0], p4[1])
# Recursively display three H shape of a smaller order
displayHShape(order - 1, p1, length / 2)
displayHShape(order - 1, p2, length / 2)
displayHShape(order - 1, p3, length / 2)
displayHShape(order - 1, p4, length / 2)
def drawLine(x1, y1, x2, y2):
turtle.penup()
turtle.goto(x1, y1)
turtle.pendown()
turtle.goto(x2, y2)
def main():
order = eval(input("Enter an order: "))
length = eval(input("Enter the length of a side: "))
displayHShape(order, [0, 0], length)
turtle.done()
main()
