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把整个国旗换成直角坐标系。
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在Python中绘制标准国旗并不简单，我们采用的方法在数学上称为解析法。把整个国旗换成直角坐标系，中心坐标为（0，0）。每个小格边长20，则国旗左上角坐标为(-300，200)、国旗长600，高400。Turtle是小海龟绘图库，Math是数学库，要用到里面的三角函数和反三角函数，以及圆周率pi值。
Python是一种解释型、面向对象、动态数据类型的高级程序设计语言。 Python于1989年底发明，第一个公开发行版发行于1991年。
import turtle //导入模块
import time
import os
def draw_square(org_x, org_y, x, y): //定义红旗绘制函数
turtle.setpos(org_x, org_y) //定义画笔初始位置
turtle.color('red', 'red') //颜色
turtle.begin_fill() //开始绘制
turtle.fd(x) //绘制偏转方向和角度
turtle.lt(90)
turtle.fd(y)
turtle.lt(90)
turtle.fd(x)
turtle.lt(90)
turtle.fd(y)
turtle.end_fill() //绘制结束
def draw_star(center_x, center_y, radius): //定义星星绘制函数
print(center_x, center_y) //显示位置
turtle.pencolor('black') //画笔轨迹颜色
turtle.setpos(center_x, center_y) //中心点位置
pt1 = turtle.pos() //偏转角度计算
turtle.circle(-radius, 360 / 5)
pt2 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt3 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt4 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt5 = turtle.pos()
turtle.color('yellow', 'yellow') //星星颜色
turtle.begin_fill() //开是绘制
turtle.goto(pt3)
turtle.goto(pt1)
turtle.goto(pt4)
turtle.goto(pt2)
turtle.goto(pt5)
turtle.end_fill() //绘制结束
print(turtle.pos())
turtle.pu() //隐藏画笔轨迹
draw_square(-320, -260, 660, 440) //绘制红旗
star_part_x = -320 //自定义星星大小等属性
star_part_y = -260 + 440
star_part_s = 660 / 30
center_x, center_y = star_part_x + star_part_s * 5, star_part_y - star_part_s * 5 //计算星星中心点位置
turtle.setpos(center_x, center_y)
turtle.lt(90)
draw_star(star_part_x + star_part_s * 5, star_part_y - star_part_s * 2, star_part_s * 3) //绘制星星
turtle.goto(star_part_x + star_part_s * 10, star_part_y - star_part_s * 2) //同上
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 12, star_part_y - star_part_s * 4)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 12, star_part_y - star_part_s * 7)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 10, star_part_y - star_part_s * 9)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.ht()
time.sleep(5) //设置挂起时间
os._exit(1)
# python6.6
import turtle
def test():
# 加纳共和国国旗呈长方形，长与宽之比为3∶2。
# 自上而下由红、黄、绿三个平行相等的横长方形组成，黄色部分中间是一颗黑色五角星。
flag_h = 300
flag_w = 450
star_h = flag_h/3
turtle.pensize(2)
turtle.speed(5)
turtle.hideturtle()
def draw_rectangle(color):
turtle.pencolor(color)
turtle.fillcolor(color)
turtle.pendown()
turtle.begin_fill()
turtle.forward(flag_w)
turtle.right(90)
turtle.forward(star_h)
turtle.right(90)
turtle.forward(flag_w)
turtle.right(90)
turtle.forward(star_h)
turtle.end_fill()
turtle.penup()
turtle.back(star_h)
turtle.right(90)
turtle.penup()
turtle.goto(-flag_w / 2, flag_h / 2)
draw_rectangle("red")
draw_rectangle("yellow")
draw_rectangle("green")
# 五角星
turtle.penup()
turtle.goto(0, star_h/2)
turtle.pencolor("black")
turtle.fillcolor("black")
turtle.right(90-18)
turtle.pendown()
turtle.begin_fill()
for i in range(5):
turtle.forward(star_h)
turtle.right(180-36)
turtle.end_fill()
turtle.done()
if __name__ == "__main__":
test()