如何用 Python 畫國家的國旗

文章來源于公眾號(hào)：Python技術(shù) 作者：派森醬

國旗作為一個(gè)國家的象征，反映出該國的特色和傳統(tǒng)。國旗起源于近代的歐洲，它是一個(gè)國家完整，主權(quán)意識(shí)增強(qiáng)后得必然產(chǎn)物。本文我們使用 Python 來畫幾面國旗，使用的 Python 庫是大家比較熟悉的 turtle。

五星紅旗

五星紅旗是中華人民共和國的國旗，它是由四顆小的黃五角星環(huán)繞一顆大的黃五角星組成的，底色為紅色，實(shí)現(xiàn)代碼如下：

turtle.setup(600,400,0,0)
turtle.bgcolor("red")
turtle.fillcolor("yellow")
turtle.color('yellow')
turtle.speed(10)
# 主星
turtle.begin_fill()
turtle.up()
turtle.goto(-280,100)
turtle.down()
for i in range (5):
    turtle.forward(150)
    turtle.right(144)
turtle.end_fill()
# 副星
turtle.begin_fill()
turtle.up()
turtle.goto(-100,180)
turtle.setheading(305)
turtle.down()
for i in range (5):
    turtle.forward(50)
    turtle.left(144)
turtle.end_fill()
turtle.begin_fill()
turtle.up()
turtle.goto(-50,110)
turtle.setheading(30)
turtle.down()
for i in range (5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()
turtle.begin_fill()
turtle.up()
turtle.goto(-40,50)
turtle.setheading(5)
turtle.down()
for i in range (5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()
turtle.begin_fill()
turtle.up()
turtle.goto(-100,10)
turtle.setheading(300)
turtle.down()
for i in range (5):
    turtle.forward(50)
    turtle.left(144)
turtle.end_fill()
turtle.hideturtle()
turtle.done()

實(shí)現(xiàn)效果如下：

青天白日旗

青天白日旗是民國時(shí)期的國旗，旗面作藍(lán)色以示青天，旗中置一射出叉光的白日?qǐng)D案，實(shí)現(xiàn)代碼如下：

t.colormode(255)
rcblue=(4,0,174)
rcred=(254,0,0)
def ol(r):
    na = 15 / 180 * math.pi
    ol=2*r*math.cos(na)
    ol=int(round(ol))
    return ol
def loop(r):
    t.fd(ol(r))
    t.right(150)
def main0(a,b):
    t.color(rcred)
    t.penup()
    t.goto(-a/2,b/2)
    t.pendown()
    t.begin_fill()
    t.goto(-a/2,-b/2)
    t.goto(a/2,-b/2)
    t.goto(a/2,b/2)
    t.end_fill()
    t.penup()
    t.goto(-a/4,b/4)
    t.pendown()
def main1(a1,b1):
    t.color('gray',rcblue)
    t.penup()
    t.right(90)
    t.fd(b1/2)
    t.left(90)
    t.pendown()
    t.begin_fill()
    t.fd(a1/2)
    t.left(90)
    t.fd(b1)
    t.left(90)
    t.fd(a1)
    t.left(90)
    t.fd(b1)
    t.left(90)
    t.fd(a1/2)
    t.end_fill()
    t.penup()
    t.goto(-a/4,b/4)
    t.seth(0)
    t.pendown()
def main2(r):
    t.pensize = 20
    t.color('white', 'white')
    t.penup()
    t.fd(r)
    t.right(180 - 30 / 2)
    t.pendown()
    t.begin_fill()
    for i in range(12):
        loop(r)
    t.end_fill()
    t.penup()
    t.goto(-a/4,b/4)
    t.seth(0)
    t.pendown()
def main3(r1,r2):
    t.color(rcblue, rcblue)  
    t.begin_fill()
    t.up()
    t.right(90)
    t.fd(r1)
    t.left(90)
    t.pd()
    t.circle(r1)
    t.end_fill()
    t.penup()
    t.goto(-a/4,b/4)
    t.pendown()
    t.color('white', 'white')
    t.begin_fill()
    t.pu()
    t.right(90)
    t.fd(r2)
    t.left(90)
    t.pd()
    t.circle(r2)
    t.end_fill()
    t.penup()
    t.goto(-a/4,b/4)
    t.seth(0)
    t.pendown()
def main(a,b):
    a1 = a / 2
    b1 = b / 2
    r = a1 / 4
    r2 = a1 / 8
    r1 = b1 * 17 / 80
    main0(a,b)
    main1(a1,b1)
    main2(r)
    main3(r1,r2)
a=1020
b=680
t.setup(1100,700,100,0)

實(shí)現(xiàn)效果如下：

紅底白十字旗

紅底白十字旗是瑞士的國旗，與其他國家有點(diǎn)不同，瑞士的國旗形狀是正方形的，代表了該國堅(jiān)守中立的政策，實(shí)現(xiàn)代碼如下：

def draw_crossshaped(aTurtle, width=0, height=0, color=None):
    aTurtle = turtle.Turtle()
    aTurtle.hideturtle()
    aTurtle.penup()
    aTurtle.goto(30, 50)
    aTurtle.begin_fill()
    aTurtle.fillcolor(color)
    for i in range(4):
        aTurtle.pendown()
        aTurtle.fd(width)
        aTurtle.rt(90)
        aTurtle.fd(height)
        aTurtle.rt(90)
        aTurtle.fd(width)
        aTurtle.lt(90)
    aTurtle.end_fill()
def draw_RQ(times=20.0):
    width, height = 26 * times, 26 * times
    window = turtle.Screen()
    aTurtle = turtle.Turtle()
    aTurtle.hideturtle()
    aTurtle.speed(10)
    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()
    draw_crossshaped(aTurtle, width=80, height=80, color='white')
    window.exitonclick()

實(shí)現(xiàn)效果如下：

星條旗

星條旗是美國的國旗，由兩部分組成，旗的左上方藍(lán)底上排列著 50 顆白色的星，其余部分是 13 道紅白相間的條子，實(shí)現(xiàn)代碼如下：

# 畫條紋
def drawSquar():
    turtle.color('black', 'red')
    turtle.begin_fill()
    for i in range(7):
        turtle.forward(600)
        turtle.left(90)
        turtle.forward(350 / 13)
        turtle.left(90)
        turtle.forward(600)
        turtle.right(90)
        turtle.forward(350 / 13)
        turtle.right(90)
    turtle.end_fill()
# 畫左上角的小矩形
def drawSmallsqure():
    turtle.color('blue')
    turtle.begin_fill()
    turtle.left(90)
    turtle.forward(350 / 2)
    turtle.left(90)
    turtle.forward(300)
    turtle.left(90)
    turtle.forward(350 * 7 / 13)
    turtle.left(90)
    turtle.forward(300)
    turtle.end_fill()
# 畫左上角的星星
def drawSrarts():
    x = -10
    y = 0
    for k in range(4):
        x = -15
        for i in range(6):
            turtle.goto(x, y)
            turtle.color('white')
            turtle.begin_fill()
            for j in range(5):
                turtle.left(144)
                turtle.forward(20)
            x -= 50
            turtle.end_fill()
        y += 350 / 13 * 2
    x = -10
    y = 350 / 13
    for i in range(3):
        x = -35
        for j in range(5):
            turtle.goto(x, y)
            turtle.color('white')
            turtle.begin_fill()
            for k in range(5):
                turtle.left(144)
                turtle.forward(20)
            x -= 50
            turtle.end_fill()
        y += 350 / 13 * 2
turtle.setup(0.8, 0.8, -100, -100)
turtle.speed(10)
turtle.pu()
turtle.forward(300)
turtle.left(90)
turtle.forward(350 / 2)
turtle.left(90)
drawSquar()
turtle.home()
drawSmallsqure()
turtle.home()
drawSrarts()
turtle.hideturtle()
turtle.done()

實(shí)現(xiàn)效果如下：

以上就是W3Cschool編程獅關(guān)于如何用 Python 畫國家的國旗的相關(guān)介紹了，希望對(duì)大家有所幫助。