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Python Teaching
Hello everyone!
Today’s lesson is about
Drawing a Christmas tree with Python~
Let’s learn together!
Part 1
1. Import Libraries
from turtle import *
from random import *
import math
Part 2
2. Define Basic Drawing Directions
def Rightdraw(Range,Fd,Right):
for i in range(Range): # Number of iterations
fd(Fd) # Move forward Fd distance
right(Right)
def Leftdraw(Range,Fd,Left):
for i in range(Range): # Number of iterations
fd(Fd) # Move forward Fd distance
left(Left)screensize(bg='black') # Set background
def changeMypos(x,y,range=heading(),Fd=0):
penup()
goto(x, y)
seth(range)
fd(Fd)
pendown()
def drawBranch(x,y,size=1):
changeMypos(x,y)
Leftdraw(6,3,9)
seth(0)
Rightdraw(6,3,9)
seth(0)
fd(6)
Part 3
3. Draw Decorative Items
(1) Draw a Star
def drawStar(x,y,Range,size):
pensize(1)
color("red","yellow")
begin_fill()
changeMypos(x,y,Range)
for i in range(5): # Draw a star
forward(10*size)
right(144) # Angle of the star
forward(10*size)
left(72) # Continue changing angle
end_fill()
right(126)(2) Snowflakes
def drawSnow():
hideturtle()
speed(0)
pencolor("white")
pensize(2)
for i in range(80): # Number of snowflakes
changeMypos(randint(-248,248), randint(-100,248))
petalNumber = 6 # Number of petals for snowflakes
snowSize = int(randint(2,10))
for j in range(petalNumber):
fd(snowSize)
backward(snowSize)
right(360/petalNumber)(3) Ribbons
def drawRibbon(x,y,range,size):
begin_fill()
color("red","red")
seth(range+40)
fd(15*size*math.tan(math.radians(range+40)))
seth(range+90)
fd(20/3*size)
seth(range-140)
fd(15*size*math.tan(math.radians(range+40)))
seth(range-90)
fd(20/3*size)
end_fill()setup(500, 500, startx=None, starty=None)
title("Merry Christmas")
speed(0)
pencolor("green")
pensize(10)
hideturtle()
changeMypos(0, 185, 0)
Part 4
4. Draw the Tree Trunk
# Top layer
seth(-120)
Rightdraw(10,12,2)
changeMypos(0,185,-60)
Leftdraw(10,12,2)
changeMypos(xcor(),ycor(),-150,10)
# First layer wave
for i in range(4):
Rightdraw(5,7,15)
seth(-150)
penup()
fd(2)
pendown()
# Second layer
changeMypos(-55,70,-120)
Rightdraw(10,8,5)
changeMypos(50,73,-60)
Leftdraw(10,8,5)
changeMypos(xcor(),ycor(),-120,10)
seth(-145)
pendown()
# Second layer wave
for i in range(5):
Rightdraw(5,9,15)
seth(-152.5)
penup()
fd(3)
pendown()
# Third layer
changeMypos(-100,0,-120)
Rightdraw(10,6.5,4.5)
changeMypos(80,0,-50)
Leftdraw(10,6,3)
changeMypos(xcor(),ycor(),-120,10)
seth(-145)
# Third wave
for i in range(6):
Rightdraw(5,9,15)
seth(-152)
penup()
fd(3)
pendown()
# Fourth layer
changeMypos(-120,-55,-130)
Rightdraw(7,10,4)
changeMypos(100,-55,-50)
Leftdraw(7,10,5)
changeMypos(xcor(),ycor(),-120,10)
seth(-155)
# Fourth layer wave
for i in range(7):
Rightdraw(5,9,13)
seth(-155)
penup()
fd(3)
pendown()
# Tree roots
changeMypos(-70,-120,-85)
Leftdraw(3,8,3)
changeMypos(70,-120,-95)
Rightdraw(3,8,3)
changeMypos(xcor(),ycor(),-170,10)
Rightdraw(10,12,2)
# Draw branches
drawBranch(45,-80)
drawBranch(-70,-25)
drawBranch(-20,40)# Add ornaments
drawStar(110, -90, 80, 1)
drawStar(-120, -100, 50, 1)
drawStar(-90, -50, 20, 1)
drawStar(90, -25, 30, 1)
drawStar(-20, 40, 30, 1)
drawStar(10, 120, 90, 1)# Print greeting
color("dark red","red") # Define font color
penup()
goto(0,-230)
write("Merry Christmas",align="center",font=("Comic Sans MS",40,"bold"))# Call the snow function
drawSnow()
done()
Result Image
This issue of Python learning ends here!
Thank you all for watching
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See you next time~
Illustration and Text | Chen Yun’er
Typesetting | Chen Yun’er
Initial Review | Xiao Junyu
Final Review | Luo Yangqianzi
Huang Guojie
Final Review | Huang Sheng
