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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:
