教程 | Python画圣诞树_changemypos怎么用

**Python教学
**

大家好呀！

今天要教学的内容是

Python画圣诞树~

让我们一起来学习吧！

part1

1.导入库

from turtle import *
from random import *
import math

part2

2.定义基本绘图方向

def Rightdraw(Range,Fd,Right):
for i in range(Range): # Range循环次数
fd(Fd) # 向前Fd个距离
right(Right)

def Leftdraw(Range,Fd,Left):
for i in range(Range): # Range循环次数
fd(Fd) # 向前Fd个距离
left(Left)

screensize(bg=‘black’)#设置背景
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)

part3

3.画装饰小物件

**（1）画五角星
**

def drawStar(x,y,Range,size):
pensize(1)
color(“red”,“yellow”)
begin_fill()
changeMypos(x,y,Range)
for i in range(5): #画五角星
forward(10*size)
right(144) #五角星的角度
forward(10*size)
left(72) #继续换角度
end_fill()
right(126)

**（2）**雪花

def drawSnow():
hideturtle()
speed(0)
pencolor(“white”)
pensize(2)
for i in range(80): # 雪花数量 changeMypos(randint(-248,248),

randint(-100,248))
petalNumber = 6 # 雪花花瓣数为6
snowSize = int(randint(2,10))
for j in range(petalNumber):
fd(snowSize)
backward(snowSize)
right(360/petalNumber)

（3）彩带

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)

part4

4.画树身

# 树顶层
seth(-120)
Rightdraw(10,12,2)
changeMypos(0,185,-60)
Leftdraw(10,12,2)
changeMypos(xcor(),ycor(),-150,10)
# 第一层的波浪
for i in range(4):
Rightdraw(5,7,15)
seth(-150)
penup()
fd(2)
pendown()
# 二层
changeMypos(-55,70,-120)
Rightdraw(10,8,5)
changeMypos(50,73,-60)
Leftdraw(10,8,5)
changeMypos(xcor(),ycor(),-120,10)
seth(-145)
pendown()
# 第二层的波浪
for i in range(5):
Rightdraw(5,9,15)
seth(-152.5)
penup()
fd(3)
pendown()
# 树三层
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)
# 第三次的波浪
for i in range(6):
Rightdraw(5,9,15)
seth(-152)
penup()
fd(3)
pendown()
# 树四层
changeMypos(-120,-55,-130)
Rightdraw(7,10,4)
changeMypos(100,-55,-50)
Leftdraw(7,10,5)
changeMypos(xcor(),ycor(),-120,10)
seth(-155)
# 第四层的波浪
for i in range(7):
Rightdraw(5,9,13)
seth(-155)
penup()
fd(3)
pendown()
# 树根
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)
# 画树枝
drawBranch(45,-80)
drawBranch(-70,-25)
drawBranch(-20,40）

# 添加挂件

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)

# 打印祝福语

color(“dark red”,“red”) #定义字体颜色
penup()
goto(0,-230)
write(“MerryChristmas”,align=“center”,font=(“Comic Sans MS”,40,“bold”))

# 调用下雪的函数

drawSnow()
done()

**效果图
**

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