Turtle library is a library in Python language popular drawing an image, imagine a small turtle, a horizontal axis is x, the vertical axis represents the y coordinate origin, (0,0) starting position, in accordance with a set of functions that control command, is moved in the plane coordinate system, so as to draw a pattern on its path crawling.
In 1966, Seymour Papert and Wally Feurzig invented a special children to learn programming language --LOGO language, it is distinguished by programming the command of a small turtle (turtle) draw on the screen. Drawing Turtle (Turtle Graphics) was later ported to a variety of high-level languages, Python built turtle library, essentially 100% of the original copy of all the features of Turtle Graphics.
Before using the library need to import:
from turtle import *
Brush movement command
| command |
Explanation |
| turtle.forward(distance) |
Moving distance to the current pixel length direction of the brush |
| turtle.backward(distance) |
Pixel distance moved in the opposite direction to the current length of the brush |
| turtle.right(degree) |
Moving clockwise degree ° |
| turtle.left(degree) |
Moves counterclockwise degree ° |
| turtle.pendown() |
Graphics rendering, the default is also moved to draw |
| turtle.goto(x,y) |
The pen is moved to the coordinate x, y position |
| turtle.penup() |
Gv move, no draw graphics for a place to start a new drawing |
| turtle.circle() |
Circle, the radius is positive (negative), it represents the center (on the right) to draw a circle on the left side of the brush |
| setx () |
The x-axis current to a specific location |
| sets () |
The current y axis to a specified position |
| setheading(angle) |
Set current orientation angle to an angle |
| home() |
Sets the current pen position as the origin toward the East. |
| dot(r) |
Draw a specified diameter and color dot |
Brush Control Command
| command |
Explanation |
| turtle.fillcolor(colorstring) |
Draw fill color graphics |
| turtle.color(color1, color2) |
And set pencolor = color1, fillcolor = color2 |
| turtle.filling() |
Returns whether the current state of the filling |
| turtle.begin_fill() |
Ready to start filling graphics |
| turtle.end_fill() |
The filling is completed |
| turtle.hideturtle() |
turtle shape hidden brush |
| turtle.showturtle() |
Display turtle shaped brush |
For example, draw a rectangle:
All imported content # turtle package: from turtle Import * # set the brush Width: width (. 4) # Forward: Forward (200 is) # 90-degree right turn: right (90) # brush Color: penColor ( 'Red') Forward (100) right (90) penColor ( 'Green') Forward (200 is) right (90) penColor ( 'Blue') Forward (100) right (90) # calls done () so that the window is waiting to be shut down, otherwise it will immediately Close: DONE ()
Please refer to the operating instructions for more turtle library. https://docs.python.org/3.6/library/frameworks.html
Five-pointed star:
from turtle import *
for i in range(5):
fd(200)
rt(144)
done()
Fill Color
from turtle import *
width(4)
pencolor("yellow")
fillcolor("red")
begin_fill()
for i in range(5):
fd(200)
rt(144)
end_fill()
done()
Sunflower:
from turtle import *
color('red', 'yellow')
begin_fill()
while True:
forward(200)
left(170)
if abs(pos()) < 1:
break
end_fill()
done()
Tai Chi diagram:
from turtle import *
circle(100,180)
circle(200,180)
circle(100,-180)
fillcolor('black')
begin_fill()
circle(100,180)
circle(200,180)
circle(100,-180)
end_fill()
penup()
goto(0,100)
dot(50)
goto(0,-100)
pencolor('white')
dot(50)
hideturtle()
done()
Method using a nested loop drawing:
from turtle import *
for i in range(6):
pendown()
fd(150)
for j in range(10):
circle(40)
lt(36)
lt(60)
penup()
goto(0,0)
done()
Draw a smiley face
from turtle import *
def go(x,y):
penup()
goto(x,y)
pendown()
def arc(radius):
circle(radius,90)
reset()
speed(0)
go(0,-150)
circle(200)
go(50,100)
seth(225)
arc(10)
arc(50)
arc(10)
arc(50)
go(-50,100)
seth(-45)
arc(-10)
arc(-50)
arc(-10)
arc(-50)
go(-70,-50)
arc(100)
hideturtle()
Draw a tree type:
from turtle import *
# 设置色彩模式是RGB:
colormode(255)
lt(90)
lv = 14
l = 120
s = 45
width(lv)
# 初始化RGB颜色:
r = 0
g = 0
b = 0
pencolor(r, g, b)
penup()
bk(l)
pendown()
fd(l)
def draw_tree(l, level):
global r, g, b
# save the current pen width
w = width()
# narrow the pen width
width(w * 3.0 / 4.0)
# set color:
r = r + 1
g = g + 2
b = b + 3
pencolor(r % 200, g % 200, b % 200)
l = 3.0 / 4.0 * l
lt(s)
fd(l)
if level < lv:
draw_tree(l, level + 1)
bk(l)
rt(2 * s)
fd(l)
if level < lv:
draw_tree(l, level + 1)
bk(l)
lt(s)
# restore the previous pen width
width(w)
speed("fastest")
draw_tree(l, 4)
done()
FIG Spiral:
from turtle import *
for i in range(100):
fd(2*i)
lt(90)
done()
from turtle import *
speed(10)
for i in range(200):
fd(2*i)
lt(92)
done()
