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用 Python 画了几面国旗

 3 years ago
source link: http://www.justdopython.com/2021/01/27/flag/
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用 Python 画了几面国旗

发表于 2021-01-27

| 分类于 python

国旗是一个国家的象征，它可以反映一个国家的特色和传统，国旗起源于近代的欧洲，是一个国家主权意识不断增强后的必然产物，本文我们使用 Python 来画几面国旗，使用的 Python 库是大家比较熟悉的 turtle。

五星红旗是中华人民共和国的国旗，它是由四颗小的黄五角星环绕一颗大的黄五角星组成的，底色为红色，实现代码如下：

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()

实现效果如下：

红底白十字旗

红底白十字旗是瑞士的国旗，与其他国家有点不同，瑞士的国旗形状是正方形的，代表了该国坚守中立的政策，实现代码如下：

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()

实现效果如下：

星条旗是美国的国旗，由两部分组成，旗的左上方蓝底上排列着 50 颗白色的星，其余部分是 13 道红白相间的条子，实现代码如下：

# 画条纹
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()
# 画左上角的小矩形
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()
# 画左上角的星星
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()

实现效果如下：

一点红旗是日本的国旗，构成比较简单，就是在长方形白底中点一个大红点，实现代码如下：

turtle.setup(width=600, height=400)
# 设置画笔起点
turtle.penup()
turtle.goto(0, -50)
turtle.pendown()
# 设置画笔属性
turtle.pensize(5)
turtle.pencolor("red")
turtle.fillcolor("red")
# 绘制速度
turtle.speed(10)
turtle.begin_fill()
turtle.circle(50)
turtle.end_fill()
turtle.hideturtle()
turtle.mainloop()

实现效果如下：

本文我们使用 Python 绘制了几面国旗，有兴趣的可以尝试绘制一下其他国家的国旗。

示例代码：https://github.com/JustDoPython/python-examples/tree/master/yeke/py-cflag


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