Python - Learning to Program(More Turtle Graphics, Another Star-Drawing Function)

Python for Kids:
A Playful Introduction to Programming
(No Starch Press)
Jason R. Briggs (著)
邦訳

開発環境

• OS X Yosemite - Apple (OS)
• Emacs (Text Editor)
• Python 3.4 (プログラミング言語)

Python for Kids: A Playful Introduction to Programming (Jason R. Briggs (著) 、No Starch Press)のPart Ⅰ.(Learning to Program)、Chapter 11.(More Turtle Graphics)、Programming Puzzles #3: Another Star-Drawing Function(No. 3103)を解いてみる。

Programming Puzzles #3: Another Star-Drawing Function(No. 3103)

コード(Emacs)

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import turtle

t = turtle.Pen()
t.speed(0)

def draw_star_only_left(size=100, points=5):
    angle = 360 / points
    for x in range(points):
        t.forward(size)
        t.left(180 - angle)
        t.forward(size)
        t.left(180 + 2 * angle)

def draw_star(size=100, points=5):
    angle = 360 / points
    for x in range(points):
        t.forward(size)
        t.left(180 - angle)
        t.forward(size)
        t.right(180 - 2 * angle)
        
for points in range(5, 10):
    draw_star_only_left(points = points)
    t.reset()
    draw_star(points=points)
    t.reset()

draw_star(size=50, points=50)    

入出力結果(Terminal, IPython)

$ ./sample3.py
$