Answer
code
Work Step by Step
# 10.34 (Turtle: draw histograms) Rewrite the preceding program using Turtle.
import random
import turtle
def drawHistogram(list):
WIDTH = 600 # Width of the histogram
HEIGHT = 300 # Height of the histogram
# Draw a base line
turtle.penup()
turtle.goto(-WIDTH / 2, -HEIGHT / 2)
turtle.pendown()
turtle.forward(WIDTH)
widthOfBar = WIDTH / len(list) # Width of each bar
for i in range(len(list)):
height = list[i] * HEIGHT / max(list)
drawABar(-WIDTH / 2 + i * widthOfBar + 10,
-HEIGHT / 2, widthOfBar - 5, height)
drawAString(-WIDTH / 2 + i * widthOfBar + 18,
-HEIGHT / 2 - 15, chr(i + ord('a')))
turtle.hideturtle()
def drawABar(i, j, widthOfBar, height):
turtle.penup()
turtle.goto(i, j)
turtle.setheading(90) # Set orientation to north
turtle.pendown()
turtle.forward(height) # Draw a vertical line
turtle.right(90) # Turn right 90 degrees
turtle.forward(widthOfBar) # Draw a horizontal line
turtle.right(90) # Turn right 90 degrees
turtle.forward(height) # Draw a vertical line
def drawAString(i, j, ch):
turtle.penup()
turtle.goto(i, j)
turtle.setheading(90) # Set orientation to north
turtle.pendown()
turtle.write(ch)
counts = [0] * 26
for i in range(1000):
c = random.randint(0, 25)
counts[c] += 1
drawHistogram(counts)
turtle.done()
