Drawing a Mid‑Autumn Festival Mooncake with Python Turtle

This article introduces the Python turtle library and explains several frequently used functions such as setup , begin_fill , end_fill , goto , bk , fd , circle , seth , left , right , penup , pendown , pencolor , pensize , colormode , and done . A table lists each function with a brief Chinese description.

Parameter

Description

turtle.setup(width,height,startx,starty)

Starting coordinates: top‑left corner relative to the screen, default is screen centre

turtle.begin_fill()

Prepare to fill a shape

turtle.end_fill()

Complete the fill

turtle.goto(x,y)

Move the turtle to an absolute coordinate

turtle.bk(d)

Move the turtle backward by distance d

turtle.fd(d)

Move the turtle forward by distance d

turtle.circle(r,angle)

Draw a circle with radius r (optional angle)

turtle.seth(angle)

Set the turtle’s heading to an absolute angle

turtle.left(angle)

Turn left by angle degrees

turtle.right(angle)

Turn right by angle degrees

penup()

Lift the pen

pendown()

Put the pen down

pencolor()

Set pen colour

pensize()

Set pen thickness

turtle.colormode(mode)

Change RGB mode; mode=1.0 for decimal, mode=255 for integer values (e.g., white = 255,255,255)

turtle.done()

Keep the drawing window open after completion

The full script below creates a class MidAutumnFestival that draws a mooncake, its decorative edge, and a festive message using the turtle graphics commands described above.

<code>import turtle

class MidAutumnFestival(object):
    def __init__(self):
        self.turtle = turtle.Pen()
        self.turtle.speed(10)

    def __del__(self):
        turtle.done() # Used to keep the disappearance of the screen at the end
        self.turtle.down()

    def goto(self, x, y):
        self.turtle.penup()
        self.turtle.goto(x, y)
        self.turtle.pendown()

    def circular(self):
        self.turtle.color("#D1C185", "#839F26")
        self.goto(0, -200)
        self.turtle.begin_fill()
        self.turtle.circle(200)
        self.turtle.end_fill()

    def color_edge(self):
        self.goto(0, 0)
        self.turtle.color("#FFA100")
        for _ in range(20):
            self.turtle.right(18)
            self.turtle.begin_fill()
            self.turtle.forward(220)
            self.turtle.circle(40, 180)
            self.turtle.goto(0, 0)
            self.turtle.right(180)
            self.turtle.end_fill()

    def in_chart(self):
        self.turtle.color('#D1C185')
        self.goto(0, -25)
        for _ in range(12):
            self.turtle.begin_fill()
            self.turtle.circle(150, 60)
            self.turtle.left(90)
            self.turtle.circle(150, 60)
            self.turtle.end_fill()

    def wirte_words(self, words):
        self.goto(-40, 10)
        self.turtle.color("red")
        self.turtle.write(words, font=("Time", 23, "bold"))
        self.turtle.pendown()

    def run(self):
        self.color_edge()
        self.circular()
        self.in_chart()
        self.wirte_words("祝大家中秋节快乐!")

if __name__ =='__main__':
    maf = MidAutumnFestival()
    maf.run()
</code>

Running the script produces the illustrated mooncake image shown in the article, and the author wishes everyone a happy Mid‑Autumn Festival.