ipython-turtle-next

Creating Turtle Graphics in IPython/Jupyter with ipycanvas

This is inspired by https://github.com/gkvoelkl/ipython-turtle-widget. Thanks.

I am using ipycanvas (https://github.com/martinRenou/ipycanvas). Thanks to Martin Renou.

If you like it, use it. If you have some suggestions, tell me (hebi@python-ninja.com).

Install

To install use pip:

$ pip install ipyturtlenext

Examples

The most examples are inspired by Harold Abelson, Andrea diSessa: Turtle Geometry, MIT Press 1986

ipyturtlenext should work in every jupyter environment, where ipycanvas works.

Start

from ipyturtlenext import Turtle

t = Turtle(width=200, height=200)
t

With width and height you can change the extension of the drawing canvas.

In Jupyterlab you can create with new view for outout a separeted tab.

First Steps

t.right(90)
t.heading()

t.forward(150)
t.left(45)

t.back(100)

t.left(45)
t.penup()
t.forward(100)

Square

t.reset() #clear canvas and start again

t.back(40)
t.forward(100)
t.position()

def square(size):
    for i in range(4):
        t.forward(size)
        t.right(90)

square(20)

Triangel

t.reset()

def triangle(size):
    for i in range(3):
        t.forward(size)
        t.right(120)

triangle(100)

House

t.reset()

def house(size):
    square(size)
    t.forward(size)
    t.right(30)
    triangle(size)

t.back(100)
house(100)

Circle

t.reset()

def circle():
    for i in range(360):
        t.forward(1)
        t.right(1)

circle()

Poly

t.reset()

def poly(side, angle):
    turn = 0
    while turn == 0 or turn % 360 != 0:
        t.forward(side)
        t.right(angle)
        turn += angle

poly(44,135)

Color

Return the current pen color as RGB tuple or web color name

t.reset()
t.pencolor()

Set pen color as web color name

t.pencolor('Green')

Set pen color with RGB value

t.pencolor(255,0,0)

t.forward(40)
t.right(120)
t.pencolor('Blue')
t.forward(40)

t.pencolor('Red')
t.pendown()

t.forward(100)

Branch

def lbranch(length, angle, level):
    t.pencolor('Green')
    t.forward(2*length)
    node(length, angle, level)
    t.back(2*length)
    
def rbranch(length, angle, level):
    t.pencolor('Brown')
    t.forward(length)
    node(length, angle, level)
    t.back(length)

def node(length, angle, level):
    if level==0:
        return
    t.left(angle)
    lbranch(length, angle, level-1)
    t.right(2*angle)
    rbranch(length, angle, level-1)
    t.left(angle)

t.reset()
node(8,24,7)

Nested Triangle

def nested_triangle(size):
    if size < 10:
        return
    for i in range(3):
        nested_triangle(size/2)
        t.forward(size)
        t.right(120)

t.reset()
nested_triangle(100)

Snowflake

def snowflake(size, level):
    for i in range(3):
        side(size, level)
        t.right(120)

def side(size, level):
    if level == 0:
        t.forward(size)
        return
    side(size/3, level - 1)
    t.left(60)
    side(size/3, level - 1)
    t.right(120)
    side(size/3, level - 1)
    t.left(60)
    side(size/3, level - 1)

t.reset()
snowflake(100,4)

Nested squares

t.reset()
sideLength = 40
for square in range(5):
    for side in range(4):
        t.forward(sideLength)
        t.left(90)
    sideLength += 10

Changelog

0.1.0 First published version