Python使用Turtle模块绘制五星红旗代码示例

# 初始化屏幕window = turtle.Screen()# 新建turtle对象实例import turtleaTurtle = turtle.Turtle()# 海龟设置aTurtle.hideturtle() # 隐藏箭头aTurtle.speed(10)  # 设置速度# 前进后退，左转右转aTurtle.fd(100)  # 前进100像素aTurtle.right(90) # 右转90°aTurtle.back(100)aTurtle.left(90)# 填充颜色aTurtle.begin_fill()aTurtle.fillcolor('yellow')DoSomethinghere()aTurtle.end_fill()# 抬起笔和放下笔，这样进行的操作不会留下痕迹aTurtle.penup()aTurtle.goto(start_pos)aTurtle.fd(radius)aTurtle.pendown()

#!/usr/bin/env python   # -*- coding: utf-8 *-''' 对于turtle类的一些封装方法，包括画正多边形，正多角形和五星红旗。'''__author__ = 'Hu Wenchao' import turtleimport math def draw_polygon(aTurtle, size=50, n=3):  ''' 绘制正多边形  args:    aTurtle: turtle对象实例    size: int类型，正多边形的边长    n: int类型，是几边形      '''  for i in xrange(n):    aTurtle.forward(size)    aTurtle.left(360.0/n) def draw_n_angle(aTurtle, size=50, num=5, color=None):  ''' 绘制正n角形，默认为黄色  args:    aTurtle: turtle对象实例    size: int类型，正多角形的边长    n: int类型，是几角形      color: str， 图形颜色，默认不填色  '''  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):  ''' 根据起始位置、结束位置和外接圆半径画五角星  args:    aTurtle: turtle对象实例    start_pos: int的二元tuple，要画的五角星的外接圆圆心    end_pos: int的二元tuple，圆心指向的位置坐标点    radius: 五角星外接圆半径    color: str， 图形颜色，默认不填色    '''  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):  ''' 绘制五星红旗  args:    times: 五星红旗的规格为30*20， times为倍数，默认大小为10倍， 即300*200  '''  width, height = 30*times, 20*times  # 初始化屏幕和海龟  window = turtle.Screen()  aTurtle = turtle.Turtle()  aTurtle.hideturtle()  aTurtle.speed(10)  # 画红旗  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()  # 画大星星  draw_5_angle(aTurtle, start_pos=(-10*times, 5*times), end_pos=(-10*times, 8*times), radius=3*times, color='yellow')   # 画四个小星星  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')   # 点击关闭窗口  window.exitonclick()if __name__ == '__main__':    draw_5_star_flag()