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1 import turtle
2 import math
3
4 def draw_polygon(aTurtle, size=50, n=3):
5 ''' 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 '''
6 for x in range(n):
7 aTurtle.forward(size)
8 aTurtle.left(360.0/n)
9
10 def draw_n_angle(aTurtle, size=50, num=5, color=None):
11 ''' 绘制正n角形，默认为黄色 args: aTurtle: turtle对象实例
12 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 '''
13 if color:
14 aTurtle.begin_fill()
15 aTurtle.fillcolor(color)
16 for y in range(num):
17 aTurtle.forward(size)
18 aTurtle.left(360.0/num)
19 aTurtle.forward(size)
20 aTurtle.right(2*360.0/num)
21 if color:
22 aTurtle.end_fill()
23
24 def draw_5_angle(aTurtle=None, start_pos=(0,0), end_pos=(0,10), radius=100, color=None):
25 ''' 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，
26 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
27 color: str，图形颜色，默认不填色 '''
28 aTurtle = aTurtle or turtle.Turtle()
29 size = radius * math.sin(math.pi/5)/math.sin(math.pi*2/5)
30 aTurtle.left(math.degrees(math.atan2(end_pos[1]-start_pos[1], end_pos[0]-start_pos[0])))
31 aTurtle.penup()
32 aTurtle.goto(start_pos)
33 aTurtle.fd(radius)
34 aTurtle.pendown()
35 aTurtle.right(math.degrees(math.pi*9/10))
36 draw_n_angle(aTurtle, size, 5, color)
37
38 def draw_5_star_flag(times=20.0):
39 ''' 绘制五星红旗 args: times: 五星红旗的规格为30*20，
40 times为倍数，默认大小为10倍， 即300*200 '''
41 width, height = 30*times, 20*times
42 # 初始化屏幕和海龟
43 window = turtle.Screen()
44 aTurtle = turtle.Turtle()
45 aTurtle.hideturtle()
46 aTurtle.speed(10)
47 # 画红旗
48 aTurtle.penup()
49 aTurtle.goto(-width/2, height/2)
50 aTurtle.pendown()
51 aTurtle.begin_fill()
52 aTurtle.fillcolor('red')
53 aTurtle.fd(width)
54 aTurtle.right(90)
55 aTurtle.fd(height)
56 aTurtle.right(90)
57 aTurtle.fd(width)
58 aTurtle.right(90)
59 aTurtle.fd(height)
60 aTurtle.right(90)
61 aTurtle.end_fill()
62 # 画大星星
63 draw_5_angle(aTurtle, start_pos=(-10*times, 5*times), end_pos=(-10*times, 8*times), radius=3*times, color='yellow')
64 # 画四个小星星
65 stars_start_pos = [(-5, 8), (-3, 6), (-3, 3), (-5, 1)]
66 for pos in stars_start_pos:
67 draw_5_angle(aTurtle, start_pos=(pos[0]*times, pos[1]*times), end_pos=(-10*times, 5*times), radius=1*times, color='yellow')
68 # 点击关闭窗口
69 window.exitonclick()
70
71 if __name__ == '__main__':
72 draw_5_star_flag()
运行后效果:
