python画红旗图案（python教程画五星红旗）

#五星红旗有14亿护旗手#上热搜

现在是2019年8月4日，距离十月一日还有一个多月，庆祝建国70周年本篇叫你用python动态或五星红旗。

这个不是效果图下面的才是效果图。

#!/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。''' import turtle import 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 range(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()