import turtle

#setup()设置窗口大小及位置
#setup()可省略
turtle.setup(width,height,startx,starty)

turtle.setup(800,800,0,0)

turtle.setup(800,800)

#默认采用小数值 可切换为整数值

#1.0:RGB小数值模式

#255：RGB整数值模式

turtle.colormode(mode)

#抬起画笔

turtle.penup() #turtle.pu()

#落下画笔

turtle.pendown() #turtle.pd()

#画笔宽度

turtle.pensize(width)  #turtle.width(width)

#画笔颜色

turtle.pencolor(color)  #color为颜色字符串或r,g,b值

turtle.pencolor("purlple")#颜色字符串

turtle.pencolor(0.63,0.13,0.94)#RGB的小数值

turtle.pencolor((0.36,0.13,0.94))#RGB的元组值

#将画笔移动到坐标为（x,y）的位置
turtle.goto(x,y)
turtle.goto(100,100)
turtle.goto(0,0)

#向前行进d,d可以为负数

turtle.forward(d)
turtle.fd(d)

turtle.fd(100)

#向后行进d,d可以为负数
turtle.backword(d)

turtle.bk(d)

turtle.bk(100)

#根据半径r绘制extent角度的弧形

#r:默认圆心在海龟左侧r距离的位置

#extent:绘制角度。默认是360度整圆

turtle.circle(r,extent=None)

turtle.circle(100,90)

#seth()改变海龟行进方向

#angle为绝对度数

#seth()只改变方向但不行进

turtle.setheading(angle)

turtle.seth(angle)

turtle.seth(45)

turtle.seth(-135)

#海龟向左转

#angle:在当前行进方向上旋转的角度

turtle.left(angle)

turtle.left(90)

#海龟向右转

turtle.right(angle)

turtle.right(90)

#停止画笔绘制，但绘图窗体不关闭

turtle.done()

#八边形绘制

import turtle

turtle.pensize(2)

for x in range(8):

    turtle.fd(100)

    turtle.left(45)

turtle.done()

#蟒蛇绘制

import turtle

turtle.setup(650,350,200,200)

turtle.penup()

turtle.fd(-250)

turtle.pendown()

turtle.pensize(25)

turtle.pencolor("purple")

turtle.seth(-40)

for i in range(4):

    turtle.circle(40,80)

    turtle.circle(-40,80)

turtle.circle(40,40)

turtle.fd(40)

turtle.circle(16,180)

turtle.fd(40*2/3)

turtle.done()

#风车绘制

import turtle

turtle.setup(650,650)

turtle.penup()

turtle.pensize(3)

turtle.pencolor("black")

turtle.pendown()

for x in [0,90,180,270]:

    turtle.seth(x)

    turtle.fd(100)

    turtle.seth(x+90)

    turtle.circle(100,-45)

    turtle.goto(0,0)

turtle.done()

#叠边形绘制，叠边形内角为80度

import turtle

turtle.setup(650,550)

turtle.penup()

turtle.fd(-100)

turtle.pensize(5)

turtle.pencolor("black")

turtle.pendown()

for x in range(9):

    turtle.fd(100)

    turtle.left(80)

turtle.done()