# 初始化屏幕
window = turtle.Screen()
# 新建turtle對(duì)象實(shí)例
import turtle
aTurtle = turtle.Turtle()
# 海龜設(shè)置
aTurtle.hideturtle() # 隱藏箭頭
aTurtle.speed(10)  # 設(shè)置速度
# 前進(jìn)后退，左轉(zhuǎn)右轉(zhuǎn)
aTurtle.fd(100)  # 前進(jìn)100像素
aTurtle.right(90) # 右轉(zhuǎn)90°
aTurtle.back(100)
aTurtle.left(90)
# 填充顏色
aTurtle.begin_fill()
aTurtle.fillcolor('yellow')
DoSomethinghere()
aTurtle.end_fill()
# 抬起筆和放下筆，這樣進(jìn)行的操作不會(huì)留下痕跡
aTurtle.penup()
aTurtle.goto(start_pos)
aTurtle.fd(radius)
aTurtle.pendown()
          

            
#!/usr/bin/env python   
# -*- coding: utf-8 ?C*-
''' 對(duì)于turtle類的一些封裝方法，包括畫正多邊形，正多角形和五星紅旗。'''
__author__ = 'Hu Wenchao'
 
import turtle
import math
 
def draw_polygon(aTurtle, size=50, n=3):
  ''' 繪制正多邊形
  args:
    aTurtle: turtle對(duì)象實(shí)例
    size: int類型，正多邊形的邊長
    n: int類型，是幾邊形    
  '''
  for i in xrange(n):
    aTurtle.forward(size)
    aTurtle.left(360.0/n)
 
def draw_n_angle(aTurtle, size=50, num=5, color=None):
  ''' 繪制正n角形，默認(rèn)為黃色
  args:
    aTurtle: turtle對(duì)象實(shí)例
    size: int類型，正多角形的邊長
    n: int類型，是幾角形  
    color: str， 圖形顏色，默認(rèn)不填色
  '''
  if color:
    aTurtle.begin_fill()
    aTurtle.fillcolor(color)
  for i in xrange(num):
    aTurtle.forward(size)
    aTurtle.left(360.0/num)
    aTurtle.forward(size)
    aTurtle.right(2*360.0/num)
  if color:
    aTurtle.end_fill()
 
def draw_5_angle(aTurtle=None, start_pos=(0,0), end_pos=(0,10), radius=100, color=None):
  ''' 根據(jù)起始位置、結(jié)束位置和外接圓半徑畫五角星
  args:
    aTurtle: turtle對(duì)象實(shí)例
    start_pos: int的二元tuple，要畫的五角星的外接圓圓心
    end_pos: int的二元tuple，圓心指向的位置坐標(biāo)點(diǎn)
    radius: 五角星外接圓半徑
    color: str， 圖形顏色，默認(rèn)不填色  
  '''
  aTurtle = aTurtle or turtle.Turtle()
  size = radius * math.sin(math.pi/5)/math.sin(math.pi*2/5)
  aTurtle.left(math.degrees(math.atan2(end_pos[1]-start_pos[1], end_pos[0]-start_pos[0])))
  aTurtle.penup()
  aTurtle.goto(start_pos)
  aTurtle.fd(radius)
  aTurtle.pendown()
  aTurtle.right(math.degrees(math.pi*9/10))
  draw_n_angle(aTurtle, size, 5, color)
 
def draw_5_star_flag(times=20.0):
  ''' 繪制五星紅旗
  args:
    times: 五星紅旗的規(guī)格為30*20， times為倍數(shù)，默認(rèn)大小為10倍， 即300*200
  '''
  width, height = 30*times, 20*times
  # 初始化屏幕和海龜
  window = turtle.Screen()
  aTurtle = turtle.Turtle()
  aTurtle.hideturtle()
  aTurtle.speed(10)
  # 畫紅旗
  aTurtle.penup()
  aTurtle.goto(-width/2, height/2)
  aTurtle.pendown()
  aTurtle.begin_fill()
  aTurtle.fillcolor('red')
  aTurtle.fd(width)
  aTurtle.right(90)
  aTurtle.fd(height)
  aTurtle.right(90)
  aTurtle.fd(width)
  aTurtle.right(90)
  aTurtle.fd(height)
  aTurtle.right(90)  
  aTurtle.end_fill()
  # 畫大星星
  draw_5_angle(aTurtle, start_pos=(-10*times, 5*times), end_pos=(-10*times, 8*times), radius=3*times, color='yellow') 
  # 畫四個(gè)小星星
  stars_start_pos = [(-5, 8), (-3, 6), (-3, 3), (-5, 1)]
  for pos in stars_start_pos:
    draw_5_angle(aTurtle, start_pos=(pos[0]*times, pos[1]*times), end_pos=(-10*times, 5*times), radius=1*times, color='yellow') 
  # 點(diǎn)擊關(guān)閉窗口
  window.exitonclick()
if __name__ == '__main__':
    draw_5_star_flag()