python学习之Turtle 5

还是回到turtle吧。

---

先上官方示例

from turtle import *
color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()
done()

Turtle motion

Move and draw

forward() | fd() #前移
backward() | bk() | back() #后移
right() | rt() #向右
left() | lt() #向左
goto() | setpos() | setposition() #定位
setx() #x方向（水平）定位
sety() #y方向（竖直）定位
setheading() | seth() #朝向
home() #复位（0,0）
circle() #圆
dot() #点
stamp() #复制当前
clearstamp() #
clearstamps() #
undo() #撤销操作
speed() #速度控制

---

>>> import turtle
>>> t = turtle.Pen() 

forward(),backward(),position()

>>> t.position()
(0.00,0.00)
>>> t.forward(25)
>>> t.position()
(25.00,0.00)
>>> t.forward(-75)
>>> t.position()
(-50.00,0.00)
>>> t.backward(30)
>>> t.position()
(-80.00,0.00)

right(),left()

>>> t.heading()
0.0   #默认向右为0，逆时针为正，顺时针为负
>>> t.right(45)  
>>> t.heading()
315.0
>>> t.left(45)
>>> t.heading()
0.0

goto(),setpos(),setposition()

>>> t.pos()
(0.00,0.00)
>>> t.setpos(60,30)
>>> t.pos()
(60.00,30.00)
>>> t.setpos(20,80)
>>> t.pos()
(20.00,80.00)

setx(),sety()

>>> t.pos()
(20.00,80.00)
>>> t.setx(10)
>>> t.pos()
(10.00,80.00)
>>> t.setx(-10)
>>> t.pos()
(-10.00,80.00)
>>> t.sety(100)
>>> t.pos()
(-10.00,100.00)

setheading()

>>> t.heading()
0.0    #方向为E
>>> t.setheading(90)
>>> t.heading()
90.0   #方向为N

home()

>>> t.pos()
(-10.00,100.00)
>>> t.home()
>>> t.pos()
(0.00,0.00)

---

今天先到这吧，明天继续……

ok，继续吧

circle()

>>> t.pos()
(0.00,0.00)
>>> t.heading()
0.0
>>> t.circle(50)
>>> t.heading()
0.0
>>> t.pos()
(-0.00,0.00)
>>> t.circle(120, 180)
>>> t.heading()
180.0
>>> t.pos()
(0.00,240.00)

dot()

>>> t.dot()
>>> t.fd(50); t.dot(20, "blue"); t.fd(50)
>>> t.pos()
(100.00,0.00)
>>> t.heading()
0.0

stamp() ,clearstamp() ,clearstamps()

>>> t.color("blue")
>>> t.stamp()
10
>>> t.fd(50)

>>> t.pos()
(150.00,0.00)
>>> t.color("red")
>>> ts = t.stamp()
>>> t.fd(50)
>>> t.pos()
(200.00,0.00)

>>> t.clearstamp(ts)
>>> t.pos()
(200.00,0.00)

>>> for i in range(8):
    t.stamp(); t.fd(10)

24
25
26
27
28
29
30
31

>>> t.clearstamps(2)

>>> t.clearstamps(-2)

>>> t.clearstamps()

undo()

>>> t.reset()
>>> for i in range(4):
    t.fd(50); t.lt(90)

>>> for i in range(8):
    t.undo()

speed()

>>> t.speed()
3
>>> t.speed('normal')
>>> t.speed()
6
>>> t.speed(9)
>>> t.speed()
9