# turtle.py: a Tkinter based turtle graphics module for Python
# Version 1.1b - 4. 5. 2009
# Copyright (C) 2006 - 2010 Gregor Lingl
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
Turtle graphics is a popular way for introducing programming to
kids. It was part of the original Logo programming language developed
by Wally Feurzig and Seymour Papert in 1966.
Imagine a robotic turtle starting at (0, 0) in the x-y plane. After an ``import turtle``, give it
the command turtle.forward(15), and it moves (on-screen!) 15 pixels in
the direction it is facing, drawing a line as it moves. Give it the
command turtle.right(25), and it rotates in-place 25 degrees clockwise.
By combining together these and similar commands, intricate shapes and
pictures can easily be drawn.
This module is an extended reimplementation of turtle.py from the
Python standard distribution up to Python 2.5. (See: https://www.python.org)
It tries to keep the merits of turtle.py and to be (nearly) 100%
compatible with it. This means in the first place to enable the
learning programmer to use all the commands, classes and methods
interactively when using the module from within IDLE run with
Roughly it has the following features added:
- Better animation of the turtle movements, especially of turning the
turtle. So the turtles can more easily be used as a visual feedback
instrument by the (beginning) programmer.
- Different turtle shapes, gif-images as turtle shapes, user defined
and user controllable turtle shapes, among them compound
(multicolored) shapes. Turtle shapes can be stretched and tilted, which
makes turtles very versatile geometrical objects.
- Fine control over turtle movement and screen updates via delay(),
and enhanced tracer() and speed() methods.
- Aliases for the most commonly used commands, like fd for forward etc.,
following the early Logo traditions. This reduces the boring work of
typing long sequences of commands, which often occur in a natural way
when kids try to program fancy pictures on their first encounter with
- Turtles now have an undo()-method with configurable undo-buffer.
- Some simple commands/methods for creating event driven programs
(mouse-, key-, timer-events). Especially useful for programming games.
- A scrollable Canvas class. The default scrollable Canvas can be
extended interactively as needed while playing around with the turtle(s).
- A TurtleScreen class with methods controlling background color or
background image, window and canvas size and other properties of the
- There is a method, setworldcoordinates(), to install a user defined
coordinate-system for the TurtleScreen.
- The implementation uses a 2-vector class named Vec2D, derived from tuple.
This class is public, so it can be imported by the application programmer,
which makes certain types of computations very natural and compact.
- Appearance of the TurtleScreen and the Turtles at startup/import can be
configured by means of a turtle.cfg configuration file.
The default configuration mimics the appearance of the old turtle module.
- If configured appropriately the module reads in docstrings from a docstring
dictionary in some different language, supplied separately and replaces
the English ones by those read in. There is a utility function
write_docstringdict() to write a dictionary with the original (English)
docstrings to disc, so it can serve as a template for translations.
Behind the scenes there are some features included with possible
extensions in mind. These will be commented and documented elsewhere.
_ver = "turtle 1.1b- - for Python 3.1 - 4. 5. 2009"
from os.path import isfile, split, join
from copy import deepcopy
from tkinter import simpledialog
_tg_classes = ['ScrolledCanvas', 'TurtleScreen', 'Screen',
'RawTurtle', 'Turtle', 'RawPen', 'Pen', 'Shape', 'Vec2D']
_tg_screen_functions = ['addshape', 'bgcolor', 'bgpic', 'bye',
'clearscreen', 'colormode', 'delay', 'exitonclick', 'getcanvas',
'getshapes', 'listen', 'mainloop', 'mode', 'numinput',
'onkey', 'onkeypress', 'onkeyrelease', 'onscreenclick', 'ontimer',
'register_shape', 'resetscreen', 'screensize', 'setup',
'setworldcoordinates', 'textinput', 'title', 'tracer', 'turtles', 'update',
'window_height', 'window_width']
_tg_turtle_functions = ['back', 'backward', 'begin_fill', 'begin_poly', 'bk',
'circle', 'clear', 'clearstamp', 'clearstamps', 'clone', 'color',
'degrees', 'distance', 'dot', 'down', 'end_fill', 'end_poly', 'fd',
'fillcolor', 'filling', 'forward', 'get_poly', 'getpen', 'getscreen', 'get_shapepoly',
'getturtle', 'goto', 'heading', 'hideturtle', 'home', 'ht', 'isdown',
'isvisible', 'left', 'lt', 'onclick', 'ondrag', 'onrelease', 'pd',
'pen', 'pencolor', 'pendown', 'pensize', 'penup', 'pos', 'position',
'pu', 'radians', 'right', 'reset', 'resizemode', 'rt',
'seth', 'setheading', 'setpos', 'setposition', 'settiltangle',
'setundobuffer', 'setx', 'sety', 'shape', 'shapesize', 'shapetransform', 'shearfactor', 'showturtle',
'speed', 'st', 'stamp', 'tilt', 'tiltangle', 'towards',
'turtlesize', 'undo', 'undobufferentries', 'up', 'width',
_tg_utilities = ['write_docstringdict', 'done']
__all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions +
_tg_utilities + ['Terminator']) # + _math_functions)
_alias_list = ['addshape', 'backward', 'bk', 'fd', 'ht', 'lt', 'pd', 'pos',
'pu', 'rt', 'seth', 'setpos', 'setposition', 'st',
'turtlesize', 'up', 'width']
_CFG = {"width" : 0.5, # Screen
"mode": "standard", # TurtleScreen
"undobuffersize": 1000, # RawTurtle
"resizemode" : "noresize",
"language": "english", # docstrings
"exampleturtle": "turtle",
"examplescreen": "screen",
"title": "Python Turtle Graphics",
def config_dict(filename):
"""Convert content of config-file into dictionary."""
with open(filename, "r") as f:
if not line or line.startswith("#"):
key, value = line.split("=")
print("Bad line in config-file %s:\n%s" % (filename,line))
if value in ["True", "False", "None", "''", '""']:
pass # value need not be converted
"""Read config-files, change configuration-dict accordingly.
If there is a turtle.cfg file in the current working directory,
read it from there. If this contains an importconfig-value,
say 'myway', construct filename turtle_mayway.cfg else use
turtle.cfg and read it from the import-directory, where
Update configuration dictionary first according to config-file,
in the import directory, then according to config-file in the
current working directory.
If no config-file is found, the default configuration is used.
default_cfg = "turtle.cfg"
cfgdict1 = config_dict(default_cfg)
if "importconfig" in cfgdict1:
default_cfg = "turtle_%s.cfg" % cfgdict1["importconfig"]
head, tail = split(__file__)
cfg_file2 = join(head, default_cfg)
cfgdict2 = config_dict(cfg_file2)
print ("No configfile read, reason unknown")
"""A 2 dimensional vector class, used as a helper class
for implementing turtle graphics.
May be useful for turtle graphics programs also.
Derived from tuple, so a vector is a tuple!
Provides (for a, b vectors, k number):
k*a and a*k multiplication with scalar
return tuple.__new__(cls, (x, y))
def __add__(self, other):
return Vec2D(self[0]+other[0], self[1]+other[1])
def __mul__(self, other):
if isinstance(other, Vec2D):
return self[0]*other[0]+self[1]*other[1]
return Vec2D(self[0]*other, self[1]*other)
def __rmul__(self, other):
if isinstance(other, int) or isinstance(other, float):
return Vec2D(self[0]*other, self[1]*other)
def __sub__(self, other):
return Vec2D(self[0]-other[0], self[1]-other[1])
return Vec2D(-self[0], -self[1])
return (self[0]**2 + self[1]**2)**0.5
"""rotate self counterclockwise by angle
perp = Vec2D(-self[1], self[0])
angle = angle * math.pi / 180.0
c, s = math.cos(angle), math.sin(angle)
return Vec2D(self[0]*c+perp[0]*s, self[1]*c+perp[1]*s)
def __getnewargs__(self):
return (self[0], self[1])
return "(%.2f,%.2f)" % self
##############################################################################
### From here up to line : Tkinter - Interface for turtle.py ###
### May be replaced by an interface to some different graphics toolkit ###
##############################################################################
## helper functions for Scrolled Canvas, to forward Canvas-methods
## to ScrolledCanvas class
def __methodDict(cls, _dict):
"""helper function for Scrolled Canvas"""
baseList = list(cls.__bases__)
__methodDict(_super, _dict)
for key, value in cls.__dict__.items():
if type(value) == types.FunctionType:
"""helper function for Scrolled Canvas"""
'def %(method)s(self, *args, **kw): return ' +
'self.%(attribute)s.%(method)s(*args, **kw)')
def __forwardmethods(fromClass, toClass, toPart, exclude = ()):
__methodDict(toClass, _dict_1)
mfc = __methods(fromClass)
for ex in _dict_1.keys():
if ex[:1] == '_' or ex[-1:] == '_' or ex in exclude or ex in mfc:
for method, func in _dict.items():
d = {'method': method, 'func': func}
if isinstance(toPart, str):
__stringBody % {'method' : method, 'attribute' : toPart}
setattr(fromClass, method, d[method]) ### NEWU!
class ScrolledCanvas(TK.Frame):
"""Modeled after the scrolled canvas class from Grayons's Tkinter book.
Used as the default canvas, which pops up automatically when
using turtle graphics functions or the Turtle class.
def __init__(self, master, width=500, height=350,
canvwidth=600, canvheight=500):
TK.Frame.__init__(self, master, width=width, height=height)
self._rootwindow = self.winfo_toplevel()
self.width, self.height = width, height
self.canvwidth, self.canvheight = canvwidth, canvheight
self._canvas = TK.Canvas(master, width=width, height=height,
bg=self.bg, relief=TK.SUNKEN, borderwidth=2)
self.hscroll = TK.Scrollbar(master, command=self._canvas.xview,
self.vscroll = TK.Scrollbar(master, command=self._canvas.yview)
self._canvas.configure(xscrollcommand=self.hscroll.set,
yscrollcommand=self.vscroll.set)
self.rowconfigure(0, weight=1, minsize=0)
self.columnconfigure(0, weight=1, minsize=0)
self._canvas.grid(padx=1, in_ = self, pady=1, row=0,
column=0, rowspan=1, columnspan=1, sticky='news')
self.vscroll.grid(padx=1, in_ = self, pady=1, row=0,
column=1, rowspan=1, columnspan=1, sticky='news')
self.hscroll.grid(padx=1, in_ = self, pady=1, row=1,
column=0, rowspan=1, columnspan=1, sticky='news')
self._rootwindow.bind('<Configure>', self.onResize)
def reset(self, canvwidth=None, canvheight=None, bg = None):
"""Adjust canvas and scrollbars according to given canvas size."""
self.canvwidth = canvwidth
self.canvheight = canvheight
self._canvas.config(bg=bg,
scrollregion=(-self.canvwidth//2, -self.canvheight//2,
self.canvwidth//2, self.canvheight//2))
self._canvas.xview_moveto(0.5*(self.canvwidth - self.width + 30) /
self._canvas.yview_moveto(0.5*(self.canvheight- self.height + 30) /
""" Adjust scrollbars according to window- and canvas-size.
cwidth = self._canvas.winfo_width()
cheight = self._canvas.winfo_height()
self._canvas.xview_moveto(0.5*(self.canvwidth-cwidth)/self.canvwidth)
self._canvas.yview_moveto(0.5*(self.canvheight-cheight)/self.canvheight)
if cwidth < self.canvwidth or cheight < self.canvheight:
self.hscroll.grid(padx=1, in_ = self, pady=1, row=1,
column=0, rowspan=1, columnspan=1, sticky='news')
self.vscroll.grid(padx=1, in_ = self, pady=1, row=0,
column=1, rowspan=1, columnspan=1, sticky='news')
self.hscroll.grid_forget()
self.vscroll.grid_forget()
def onResize(self, event):
""" 'forward' method, which canvas itself has inherited...
return self._canvas.bbox(*args)
def cget(self, *args, **kwargs):
""" 'forward' method, which canvas itself has inherited...
return self._canvas.cget(*args, **kwargs)
def config(self, *args, **kwargs):
""" 'forward' method, which canvas itself has inherited...
self._canvas.config(*args, **kwargs)
def bind(self, *args, **kwargs):
""" 'forward' method, which canvas itself has inherited...
self._canvas.bind(*args, **kwargs)
def unbind(self, *args, **kwargs):
""" 'forward' method, which canvas itself has inherited...
self._canvas.unbind(*args, **kwargs)
""" 'forward' method, which canvas itself has inherited...
self._canvas.focus_force()
__forwardmethods(ScrolledCanvas, TK.Canvas, '_canvas')
"""Root class for Screen based on Tkinter."""
def setupcanvas(self, width, height, cwidth, cheight):
self._canvas = ScrolledCanvas(self, width, height, cwidth, cheight)
self._canvas.pack(expand=1, fill="both")
def set_geometry(self, width, height, startx, starty):
self.geometry("%dx%d%+d%+d"%(width, height, startx, starty))
def ondestroy(self, destroy):
self.wm_protocol("WM_DELETE_WINDOW", destroy)
return self.winfo_screenwidth()
return self.winfo_screenheight()
class TurtleScreenBase(object):
"""Provide the basic graphics functionality.
Interface between Tkinter and turtle.py.
To port turtle.py to some different graphics toolkit
a corresponding TurtleScreenBase class has to be implemented.
"""return a blank image object
img = TK.PhotoImage(width=1, height=1, master=self.cv)
def _image(self, filename):
"""return an image object containing the
imagedata from a gif-file named filename.
return TK.PhotoImage(file=filename, master=self.cv)
if isinstance(cv, ScrolledCanvas):
else: # expected: ordinary TK.Canvas
w = int(self.cv.cget("width"))
h = int(self.cv.cget("height"))
self.cv.config(scrollregion = (-w//2, -h//2, w//2, h//2 ))
self.xscale = self.yscale = 1.0
"""Create an invisible polygon item on canvas self.cv)
return self.cv.create_polygon((0, 0, 0, 0, 0, 0), fill="", outline="")
def _drawpoly(self, polyitem, coordlist, fill=None,
outline=None, width=None, top=False):
"""Configure polygonitem polyitem according to provided
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
