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#
# turtle.py: a Tkinter based turtle graphics module for Python
# Version 1.1b - 4. 5. 2009
#
# Copyright (C) 2006 - 2010 Gregor Lingl
# email: glingl@aon.at
#
# 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.
"""
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.
Turtle graphics is an implementation of the drawing tools introduced in Logo
in 1967. It was created as an educational tool, and its instant, visible
feedback makes it an effective way for learners to encounter programming
concepts. It is also a convenient way to produce simple graphical output
without bringing in external libraries.
"""
import tkinter as TK
import types
import math
import time
import inspect
import sys
from os import environ
from os.path import isfile, split, join
from pathlib import Path
from contextlib import contextmanager
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', 'no_animation', 'numinput',
'onkey', 'onkeypress', 'onkeyrelease', 'onscreenclick', 'ontimer',
'register_shape', 'resetscreen', 'screensize', 'save', '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', 'fill', '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', 'poly', 'pos', 'position', 'pu', 'radians', 'right',
'reset', 'resizemode', 'rt', 'seth', 'setheading', 'setpos',
'setposition', 'setundobuffer', 'setx', 'sety', 'shape', 'shapesize',
'shapetransform', 'shearfactor', 'showturtle', 'speed', 'st', 'stamp',
'teleport', 'tilt', 'tiltangle', 'towards', 'turtlesize', 'undo',
'undobufferentries', 'up', 'width',
'write', 'xcor', 'ycor']
_tg_utilities = ['write_docstringdict', 'done']
__all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions +
_tg_utilities + ['Terminator'])
_alias_list = ['addshape', 'backward', 'bk', 'fd', 'ht', 'lt', 'pd', 'pos',
'pu', 'rt', 'seth', 'setpos', 'setposition', 'st',
'turtlesize', 'up', 'width']
_CFG = {"width" : 0.5, # Screen
"height" : 0.75,
"canvwidth" : 400,
"canvheight": 300,
"leftright": None,
"topbottom": None,
"mode": "standard", # TurtleScreen
"colormode": 1.0,
"delay": 10,
"undobuffersize": 1000, # RawTurtle
"shape": "classic",
"pencolor" : "black",
"fillcolor" : "black",
"resizemode" : "noresize",
"visible" : True,
"language": "english", # docstrings
"exampleturtle": "turtle",
"examplescreen": "screen",
"title": "Python Turtle Graphics",
"using_IDLE": False
}
def config_dict(filename):
"""Convert the content of a config file into a dict."""
with open(filename, "r") as f:
cfglines = f.readlines()
cfgdict = {}
for line in cfglines:
line = line.strip()
if not line or line.startswith("#"):
continue
try:
key, value = line.split("=")
except ValueError:
print("Bad line in config-file %s:\n%s" % (filename,line))
continue
key = key.strip()
value = value.strip()
if value in ["True", "False", "None", "''", '""']:
value = eval(value)
else:
try:
if "." in value:
value = float(value)
else:
value = int(value)
except ValueError:
pass # value need not be converted
cfgdict[key] = value
return cfgdict
def readconfig(cfgdict):
"""Read config files and update the configuration dict accordingly.
If there is a turtle.cfg file in the current working directory,
read it. If it contains an importconfig value, say 'myway',
use the filename turtle_myway.cfg, otherwise turtle.cfg, and
read that file from the directory where turtle.py is located.
The configuration dict is updated first from the config file in
the turtle.py directory, then from the one in the current working
directory. If no config file is found, the default configuration
is used.
"""
default_cfg = "turtle.cfg"
cfgdict1 = {}
cfgdict2 = {}
if isfile(default_cfg):
cfgdict1 = config_dict(default_cfg)
if "importconfig" in cfgdict1:
default_cfg = "turtle_%s.cfg" % cfgdict1["importconfig"]
try:
head, tail = split(__file__)
cfg_file2 = join(head, default_cfg)
except Exception:
cfg_file2 = ""
if isfile(cfg_file2):
cfgdict2 = config_dict(cfg_file2)
_CFG.update(cfgdict2)
_CFG.update(cfgdict1)
try:
readconfig(_CFG)
except Exception:
print ("No configfile read, reason unknown")
class Vec2D(tuple):
"""A two-dimensional vector class, used as a helper class for
implementing turtle graphics. May be useful for turtle graphics
programs too. Derived from tuple, so a vector is a tuple!
Provides (for a, b vectors, k number):
a + b: vector addition
a - b: vector subtraction
a * b: inner product
k * a and a * k: multiplication with scalar
abs(a): absolute value of a
a.rotate(angle): rotation
"""
def __new__(cls, x, y):
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)
return NotImplemented
def __sub__(self, other):
return Vec2D(self[0]-other[0], self[1]-other[1])
def __neg__(self):
return Vec2D(-self[0], -self[1])
def __abs__(self):
return math.hypot(*self)
def rotate(self, angle):
"""Rotate self counterclockwise by angle."""
perp = Vec2D(-self[1], self[0])
angle = math.radians(angle)
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])
def __repr__(self):
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__)
baseList.reverse()
for _super in baseList:
__methodDict(_super, _dict)
for key, value in cls.__dict__.items():
if type(value) == types.FunctionType:
_dict[key] = value
def __methods(cls):
"""Helper function for Scrolled Canvas."""
_dict = {}
__methodDict(cls, _dict)
return _dict.keys()
__stringBody = (
'def %(method)s(self, *args, **kw): return ' +
'self.%(attribute)s.%(method)s(*args, **kw)')
def __forwardmethods(fromClass, toClass, toPart, exclude = ()):
### MANY CHANGES ###
_dict_1 = {}
__methodDict(toClass, _dict_1)
_dict = {}
mfc = __methods(fromClass)
for ex in _dict_1.keys():
if ex[:1] == '_' or ex[-1:] == '_' or ex in exclude or ex in mfc:
pass
else:
_dict[ex] = _dict_1[ex]
for method, func in _dict.items():
d = {'method': method, 'func': func}
if isinstance(toPart, str):
execString = \
__stringBody % {'method' : method, 'attribute' : toPart}
exec(execString, d)
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.bg = "white"
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,
orient=TK.HORIZONTAL)
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.reset()
self._rootwindow.bind('<Configure>', self.onResize)
def reset(self, canvwidth=None, canvheight=None, bg = None):
"""Adjust canvas size, background color and scrollbars."""
if canvwidth:
self.canvwidth = canvwidth
if canvheight:
self.canvheight = canvheight
if bg:
self.bg = bg
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.canvwidth)
self._canvas.yview_moveto(0.5*(self.canvheight- self.height + 30) /
self.canvheight)
self.adjustScrolls()
def adjustScrolls(self):
"""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')
else:
self.hscroll.grid_forget()
self.vscroll.grid_forget()
def onResize(self, event):
"""self-explanatory"""
self.adjustScrolls()
def bbox(self, *args):
""" '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)
def focus_force(self):
""" 'forward' method, which canvas itself has inherited...
"""
self._canvas.focus_force()
__forwardmethods(ScrolledCanvas, TK.Canvas, '_canvas')
class _Root(TK.Tk):
"""Root class for Screen based on Tkinter."""
def __init__(self):
TK.Tk.__init__(self)
def setupcanvas(self, width, height, cwidth, cheight):
self._canvas = ScrolledCanvas(self, width, height, cwidth, cheight)
self._canvas.pack(expand=1, fill="both")
def _getcanvas(self):
return self._canvas
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)
def win_width(self):
return self.winfo_screenwidth()
def win_height(self):
return self.winfo_screenheight()
Canvas = TK.Canvas
class TurtleScreenBase:
"""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.
"""
def _blankimage(self):
"""Return a blank image object."""
img = TK.PhotoImage(width=1, height=1, master=self.cv)
img.blank()
return img
def _image(self, filename):
"""Return an image object containing the
imagedata from an image file named filename.
"""
return TK.PhotoImage(file=filename, master=self.cv)
def __init__(self, cv):
self.cv = cv
if isinstance(cv, ScrolledCanvas):
w = self.cv.canvwidth
h = self.cv.canvheight
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.canvwidth = w
self.canvheight = h
self.xscale = self.yscale = 1.0
self._updating = False
def _createpoly(self):
"""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 polygon item polyitem according to the given arguments.
Arguments:
coordlist -- a sequence of coordinates
fill -- the fill color
outline -- the outline color
width -- the outline width
top -- a boolean value, which specifies if polyitem will be
put on top of the canvas' display list so it will not
be covered by other items
"""
cl = []
for x, y in coordlist:
cl.append(x * self.xscale)
cl.append(-y * self.yscale)
self.cv.coords(polyitem, *cl)
if fill is not None:
self.cv.itemconfigure(polyitem, fill=fill)
if outline is not None:
self.cv.itemconfigure(polyitem, outline=outline)
if width is not None:
self.cv.itemconfigure(polyitem, width=width)
if top:
self.cv.tag_raise(polyitem)
def _createline(self):
"""Create an invisible line item on canvas self.cv."""
return self.cv.create_line(0, 0, 0, 0, fill="", width=2,
capstyle = TK.ROUND)
def _drawline(self, lineitem, coordlist=None,
fill=None, width=None, top=False):
"""Configure line item lineitem according to the given arguments.
Arguments:
coordlist -- a sequence of coordinates
fill -- the drawing color
width -- the width of the drawn line
top -- a boolean value, which specifies if lineitem will be
put on top of the canvas' display list so it will not
be covered by other items
"""
if coordlist is not None:
cl = []
for x, y in coordlist:
cl.append(x * self.xscale)
cl.append(-y * self.yscale)
self.cv.coords(lineitem, *cl)
if fill is not None:
self.cv.itemconfigure(lineitem, fill=fill)
if width is not None:
self.cv.itemconfigure(lineitem, width=width)
if top:
self.cv.tag_raise(lineitem)
def _delete(self, item):
"""Delete graphics item from canvas.
If item is "all", delete all graphics items.
"""
self.cv.delete(item)
def _update(self):
"""Redraw graphics items on canvas."""
if self._updating:
# Reentrant call (e.g. a drag handler moving the turtle,
# gh-50966): flush drawing without reprocessing input.
self.cv.update_idletasks()
return
self._updating = True
try:
self.cv.update()
finally:
self._updating = False
def _delay(self, delay):
"""Delay subsequent canvas actions for delay ms."""
self.cv.after(delay)
def _iscolorstring(self, color):
"""Check if the string color is a legal Tkinter color string.
"""
try:
self.cv.winfo_rgb(color)
ok = True
except TK.TclError:
ok = False
return ok
def _bgcolor(self, color=None):
"""Set canvas' backgroundcolor if color is not None,
else return backgroundcolor."""
if color is not None:
self.cv.config(bg = color)
self._update()
else:
return self.cv.cget("bg")
def _write(self, pos, txt, align, font, pencolor):
"""Write txt at pos on the canvas with specified font and color.
Return text item and x-coord of right bottom corner of text's
bounding box.
"""
x, y = pos
x = x * self.xscale
y = y * self.yscale
anchor = {"left":"sw", "center":"s", "right":"se" }
item = self.cv.create_text(x-1, -y, text = txt, anchor = anchor[align],
fill = pencolor, font = font)
x0, y0, x1, y1 = self.cv.bbox(item)
return item, x1-1
def _onclick(self, item, fun, num=1, add=None):
"""Bind fun to mouse-click event on turtle.
fun must be a function with two arguments, the coordinates
of the clicked point on the canvas.
num, the number of the mouse-button defaults to 1
"""
if fun is None:
self.cv.tag_unbind(item, "<Button-%s>" % num)
else:
def eventfun(event):
x, y = (self.cv.canvasx(event.x)/self.xscale,
-self.cv.canvasy(event.y)/self.yscale)
fun(x, y)
self.cv.tag_bind(item, "<Button-%s>" % num, eventfun, add)
def _onrelease(self, item, fun, num=1, add=None):
"""Bind fun to mouse-button-release event on turtle.
fun must be a function with two arguments, the coordinates
of the point on the canvas where mouse button is released.
num, the number of the mouse-button defaults to 1
If a turtle is clicked, first _onclick-event will be performed,
then _onscreensclick-event.
"""
if fun is None:
self.cv.tag_unbind(item, "<Button%s-ButtonRelease>" % num)
else:
def eventfun(event):
x, y = (self.cv.canvasx(event.x)/self.xscale,
-self.cv.canvasy(event.y)/self.yscale)
fun(x, y)
self.cv.tag_bind(item, "<Button%s-ButtonRelease>" % num,
eventfun, add)
def _ondrag(self, item, fun, num=1, add=None):
"""Bind fun to mouse-move-event (with pressed mouse button) on turtle.
fun must be a function with two arguments, the coordinates of the
actual mouse position on the canvas.
num, the number of the mouse-button defaults to 1
Every sequence of mouse-move-events on a turtle is preceded by a
mouse-click event on that turtle.
"""
if fun is None:
self.cv.tag_unbind(item, "<Button%s-Motion>" % num)
else:
def eventfun(event):
try:
x, y = (self.cv.canvasx(event.x)/self.xscale,
-self.cv.canvasy(event.y)/self.yscale)
fun(x, y)
except Exception:
pass
self.cv.tag_bind(item, "<Button%s-Motion>" % num, eventfun, add)
def _onscreenclick(self, fun, num=1, add=None):
"""Bind fun to mouse-click event on canvas.
fun must be a function with two arguments, the coordinates
of the clicked point on the canvas.
num, the number of the mouse-button defaults to 1
If a turtle is clicked, first _onclick-event will be performed,
then _onscreensclick-event.
"""
if fun is None:
self.cv.unbind("<Button-%s>" % num)
else:
def eventfun(event):
x, y = (self.cv.canvasx(event.x)/self.xscale,
-self.cv.canvasy(event.y)/self.yscale)
fun(x, y)
self.cv.bind("<Button-%s>" % num, eventfun, add)
def _onkeyrelease(self, fun, key):
"""Bind fun to key-release event of key.
Canvas must have focus. See method listen
"""
if fun is None:
self.cv.unbind("<KeyRelease-%s>" % key, None)
else:
def eventfun(event):
fun()
self.cv.bind("<KeyRelease-%s>" % key, eventfun)
def _onkeypress(self, fun, key=None):
"""If key is given, bind fun to key-press event of key.
Otherwise bind fun to any key-press.
Canvas must have focus. See method listen.
"""
if fun is None:
if key is None:
self.cv.unbind("<KeyPress>", None)
else:
self.cv.unbind("<KeyPress-%s>" % key, None)
else:
def eventfun(event):
fun()
if key is None:
self.cv.bind("<KeyPress>", eventfun)
else:
self.cv.bind("<KeyPress-%s>" % key, eventfun)
def _listen(self):
"""Set focus on canvas (in order to collect key-events)
"""
self.cv.focus_force()
def _ontimer(self, fun, t):
"""Install a timer, which calls fun after t milliseconds.
"""
if t == 0:
self.cv.after_idle(fun)
else:
self.cv.after(t, fun)
def _createimage(self, image):
"""Create and return image item on canvas.
"""
return self.cv.create_image(0, 0, image=image)
def _drawimage(self, item, pos, image):
"""Configure image item as to draw image object
at position (x,y) on canvas)
"""
x, y = pos
self.cv.coords(item, (x * self.xscale, -y * self.yscale))
self.cv.itemconfig(item, image=image)
def _setbgpic(self, item, image):
"""Configure image item as to draw image object
at center of canvas. Set item to the first item
in the displaylist, so it will be drawn below
any other item ."""
self.cv.itemconfig(item, image=image)
self.cv.tag_lower(item)
def _type(self, item):
"""Return 'line' or 'polygon' or 'image' depending on
type of item.
"""
return self.cv.type(item)
def _pointlist(self, item):
"""Return list of coordinate pairs of points of item.
For example:
>>> getscreen()._pointlist(getturtle().turtle._item)
[(0.0, 9.9999999999999982), (0.0, -9.9999999999999982),
(9.9999999999999982, 0.0)]
"""
cl = self.cv.coords(item)
pl = [(cl[i], -cl[i+1]) for i in range(0, len(cl), 2)]
return pl
def _setscrollregion(self, srx1, sry1, srx2, sry2):
self.cv.config(scrollregion=(srx1, sry1, srx2, sry2))
def _rescale(self, xscalefactor, yscalefactor):
items = self.cv.find_all()
for item in items:
coordinates = list(self.cv.coords(item))
newcoordlist = []
while coordinates:
x, y = coordinates[:2]
newcoordlist.append(x * xscalefactor)
newcoordlist.append(y * yscalefactor)
coordinates = coordinates[2:]
self.cv.coords(item, *newcoordlist)
def _resize(self, canvwidth=None, canvheight=None, bg=None):
"""Resize the canvas the turtles are drawing on.
Does not alter the drawing window.
"""
# needs amendment
if not isinstance(self.cv, ScrolledCanvas):
return self.canvwidth, self.canvheight
if canvwidth is canvheight is bg is None:
return self.cv.canvwidth, self.cv.canvheight
if canvwidth is not None:
self.canvwidth = canvwidth
if canvheight is not None:
self.canvheight = canvheight
self.cv.reset(canvwidth, canvheight, bg)
def _window_size(self):
"""Return the width and height of the turtle window."""
width = self.cv.winfo_width()
if width <= 1: # the window isn't managed by a geometry manager
width = self.cv['width']
height = self.cv.winfo_height()
if height <= 1: # the window isn't managed by a geometry manager
height = self.cv['height']
return width, height
def mainloop(self):
"""Start the event loop by calling Tkinter's mainloop function.
Must be the last statement in a turtle graphics program. Must not
be used if a script is run from within IDLE in -n mode (no
subprocess).
"""
self.cv.tk.mainloop()
def textinput(self, title, prompt):
"""Pop up a dialog window for input of a string.
title is the title of the dialog window and prompt is a text
describing what information to input. Return the string entered.
If the dialog is canceled, return None.
Arguments:
title -- a string
prompt -- a string
Example (for a TurtleScreen instance named screen):
>>> screen.textinput("NIM", "Name of first player:")
"""
return simpledialog.askstring(title, prompt, parent=self.cv)
def numinput(self, title, prompt, default=None, minval=None, maxval=None):
"""Pop up a dialog window for input of a number.
title is the title of the dialog window and prompt is a text
describing what numerical information to input. default is the
default value, minval and maxval are the minimum and maximum
values for input. If these are given, the number entered must be
between minval and maxval. If not, a hint is issued and the dialog
remains open for correction. Return the number entered.
If the dialog is canceled, return None.
Arguments:
title -- a string
prompt -- a string
default -- a number or None
minval -- a number or None
maxval -- a number or None
Example (for a TurtleScreen instance named screen):
>>> screen.numinput("Poker", "Your stakes:", 1000,
... minval=10, maxval=10000)
"""
return simpledialog.askfloat(title, prompt, initialvalue=default,
minvalue=minval, maxvalue=maxval,
parent=self.cv)
##############################################################################
### End of Tkinter - interface ###
##############################################################################
class Terminator(Exception):
"""Will be raised in TurtleScreen.update, if _RUNNING becomes False.
This stops execution of a turtle graphics script.
Main purpose: use in the Demo-Viewer turtle.Demo.py.
"""
pass
class TurtleGraphicsError(Exception):
"""Raised for invalid arguments or operations."""
class Shape:
"""Data structure modeling shapes.
type_ is one of the strings "polygon", "image" or "compound". What
data must be depends on type_: for "polygon" a tuple of pairs of
coordinates, for "image" an image (only used internally), and for
"compound" None, as a compound shape is built up using the
addcomponent method.
"""
def __init__(self, type_, data=None):
self._type = type_
if type_ == "polygon":
if isinstance(data, list):
data = tuple(data)
elif type_ == "image":
assert(isinstance(data, TK.PhotoImage))
elif type_ == "compound":
data = []
else:
raise TurtleGraphicsError("There is no shape type %s" % type_)
self._data = data
def addcomponent(self, poly, fill, outline=None):
"""Add a component to a shape of type "compound".
poly is a polygon, a tuple of pairs of numbers. fill is the color
the polygon is filled with and outline is the color of its
outline. If outline is not given, fill is used for it as well.
Arguments:
poly -- a tuple of pairs of numbers
fill -- a color
outline -- a color or None
Example:
>>> poly = ((0,0), (10,-5), (0,10), (-10,-5))
>>> s = Shape("compound")
>>> s.addcomponent(poly, "red", "blue")
>>> # ... add more components and then use register_shape()
"""
if self._type != "compound":
raise TurtleGraphicsError("Cannot add component to %s Shape"
% self._type)
if outline is None:
outline = fill
self._data.append([poly, fill, outline])
class Tbuffer:
"""Ring buffer used as undo buffer for RawTurtle objects."""
def __init__(self, bufsize=10):
self.bufsize = bufsize
self.buffer = [[None]] * bufsize
self.ptr = -1
self.cumulate = False
def reset(self, bufsize=None):
if bufsize is None:
for i in range(self.bufsize):
self.buffer[i] = [None]
else:
self.bufsize = bufsize
self.buffer = [[None]] * bufsize
self.ptr = -1
def push(self, item):
if self.bufsize > 0:
if not self.cumulate:
self.ptr = (self.ptr + 1) % self.bufsize
self.buffer[self.ptr] = item
else:
self.buffer[self.ptr].append(item)
def pop(self):
if self.bufsize > 0:
item = self.buffer[self.ptr]
if item is None:
return None
else:
self.buffer[self.ptr] = [None]
self.ptr = (self.ptr - 1) % self.bufsize
return (item)
def remove(self, item):
if item not in self.buffer:
return
index = self.buffer.index(item)
self.buffer.remove(item)
if index <= self.ptr:
self.ptr = (self.ptr - 1) % self.bufsize
self.buffer.insert((self.ptr+1) % self.bufsize, [None])
def nr_of_items(self):
return self.bufsize - self.buffer.count([None])
def __repr__(self):
return str(self.buffer) + " " + str(self.ptr)
class TurtleScreen(TurtleScreenBase):
"""Provides screen oriented methods like bgcolor etc.
Only relies upon the methods of TurtleScreenBase and not upon
components of the underlying graphics toolkit, which is Tkinter
in this case.
"""
_RUNNING = True
def __init__(self, cv, mode=_CFG["mode"],
colormode=_CFG["colormode"], delay=_CFG["delay"]):
TurtleScreenBase.__init__(self, cv)
self._shapes = {
"arrow" : Shape("polygon", ((-10,0), (10,0), (0,10))),
"turtle" : Shape("polygon", ((0,16), (-2,14), (-1,10), (-4,7),
(-7,9), (-9,8), (-6,5), (-7,1), (-5,-3), (-8,-6),
(-6,-8), (-4,-5), (0,-7), (4,-5), (6,-8), (8,-6),
(5,-3), (7,1), (6,5), (9,8), (7,9), (4,7), (1,10),
(2,14))),
"circle" : Shape("polygon", ((10,0), (9.51,3.09), (8.09,5.88),
(5.88,8.09), (3.09,9.51), (0,10), (-3.09,9.51),
(-5.88,8.09), (-8.09,5.88), (-9.51,3.09), (-10,0),
(-9.51,-3.09), (-8.09,-5.88), (-5.88,-8.09),
(-3.09,-9.51), (-0.00,-10.00), (3.09,-9.51),
(5.88,-8.09), (8.09,-5.88), (9.51,-3.09))),
"square" : Shape("polygon", ((10,-10), (10,10), (-10,10),
(-10,-10))),
"triangle" : Shape("polygon", ((10,-5.77), (0,11.55),
(-10,-5.77))),
"classic": Shape("polygon", ((0,0),(-5,-9),(0,-7),(5,-9))),
"blank" : Shape("image", self._blankimage())
}
self._bgpics = {"nopic" : ""}
self._mode = mode
self._delayvalue = delay
self._colormode = _CFG["colormode"]
self._keys = []
self.clear()
if sys.platform == 'darwin':
# Force Turtle window to the front on OS X. This is needed because
# the Turtle window will show behind the Terminal window when you
# start the demo from the command line.
rootwindow = cv.winfo_toplevel()
rootwindow.wm_attributes(topmost=True)
rootwindow.wm_attributes(topmost=False)
# A new screen means that turtle graphics is running again.
TurtleScreen._RUNNING = True
def clear(self):
"""Delete all drawings and all turtles from the TurtleScreen.
Aliases: clear | clearscreen
Reset the now empty TurtleScreen to its initial state: white
background, no background image, no event bindings and tracing on.
As a function, this method is only available under the name
clearscreen. The function clear is derived from the Turtle method
clear.
Example (for a TurtleScreen instance named screen):
>>> screen.clearscreen()
"""
self._delayvalue = _CFG["delay"]
self._colormode = _CFG["colormode"]
self._delete("all")
self._bgpic = self._createimage("")
self._bgpicname = "nopic"
self._tracing = 1
self._updatecounter = 0
self._turtles = []
self.bgcolor("white")
for btn in 1, 2, 3:
self.onclick(None, btn)
self.onkeypress(None)
for key in self._keys[:]:
self.onkey(None, key)
self.onkeypress(None, key)
Turtle._pen = None
def mode(self, mode=None):
"""Set the turtle mode and perform a reset.
mode is one of the strings "standard", "logo" or "world". If mode
is not given, return the current mode.
Mode "standard" is compatible with the old turtle module. Mode
"logo" is compatible with most Logo turtle graphics. Mode "world"
uses user-defined world coordinates, see setworldcoordinates(). In
this mode, angles appear distorted if the x and y units are not of
equal length.
Mode Initial turtle heading positive angles
------------|-------------------------|-------------------
"standard" to the right (east) counterclockwise
"logo" upward (north) clockwise
Argument:
mode -- a string or None
Example (for a TurtleScreen instance named screen):
>>> screen.mode("logo") # resets turtle heading to north
>>> screen.mode()
'logo'
"""
if mode is None:
return self._mode
mode = mode.lower()
if mode not in ["standard", "logo", "world"]:
raise TurtleGraphicsError("No turtle-graphics-mode %s" % mode)
self._mode = mode
if mode in ["standard", "logo"]:
self._setscrollregion(-self.canvwidth//2, -self.canvheight//2,
self.canvwidth//2, self.canvheight//2)
self.xscale = self.yscale = 1.0
self.reset()
def setworldcoordinates(self, llx, lly, urx, ury):
"""Set up a user-defined coordinate system.
llx and lly are the x and y coordinates of the lower left corner of
the canvas. urx and ury are the x and y coordinates of the upper
right corner. Switch to mode "world" if necessary, which performs a
reset. If mode "world" is already active, all drawings are redrawn
according to the new coordinates. In user-defined coordinate
systems, angles may appear distorted, see mode().
Arguments:
llx -- a number
lly -- a number
urx -- a number
ury -- a number
Example (for a TurtleScreen instance named screen):
>>> screen.reset()
>>> screen.setworldcoordinates(-50,-7.5,50,7.5)
>>> for _ in range(72):
... left(10)
...
>>> for _ in range(8):
... left(45); fd(2) # a regular octagon
"""
if self.mode() != "world":
self.mode("world")
xspan = float(urx - llx)
yspan = float(ury - lly)
wx, wy = self._window_size()
self.screensize(wx-20, wy-20)
oldxscale, oldyscale = self.xscale, self.yscale
self.xscale = self.canvwidth / xspan
self.yscale = self.canvheight / yspan
srx1 = llx * self.xscale
sry1 = -ury * self.yscale
srx2 = self.canvwidth + srx1
sry2 = self.canvheight + sry1
self._setscrollregion(srx1, sry1, srx2, sry2)
self._rescale(self.xscale/oldxscale, self.yscale/oldyscale)
self.update()
def register_shape(self, name, shape=None):
"""Add a turtle shape to the TurtleScreen's shape list.
Aliases: register_shape | addshape
It can be called in four different ways:
(1) name is the name of an image file (PNG, GIF, PGM, and PPM) and
shape is None. Install the corresponding image shape.
(2) name is an arbitrary string and shape is the name of an image
file (PNG, GIF, PGM, and PPM). Install the corresponding image
shape.
(3) name is an arbitrary string and shape is a tuple of pairs of
coordinates. Install the corresponding polygon shape.
(4) name is an arbitrary string and shape is a (compound) Shape
object. Install the corresponding compound shape.
Image shapes do not rotate when turning the turtle, so they do not
display the heading of the turtle. To use a registered shape, call
shape() with its name.
Arguments:
name -- a string
shape -- a string, a tuple of pairs of numbers, a Shape object
or None
Example (for a TurtleScreen instance named screen):
>>> screen.register_shape("turtle.gif")
>>> screen.register_shape("turtle", "turtle.gif")
>>> screen.register_shape("triangle", ((5,-3), (0,5), (-5,-3)))
"""
if shape is None:
shape = Shape("image", self._image(name))
elif isinstance(shape, str):
shape = Shape("image", self._image(shape))
elif isinstance(shape, tuple):
shape = Shape("polygon", shape)
## else shape assumed to be Shape-instance
self._shapes[name] = shape
def _colorstr(self, color):
"""Return the color string corresponding to color.
color may be a string or a tuple of three numbers, each between 0 and
the current colormode.
If color doesn't represent a color, an error is raised.
"""
if len(color) == 1:
color = color[0]
if isinstance(color, str):
if self._iscolorstring(color) or color == "":
return color
else:
raise TurtleGraphicsError("bad color string: %s" % str(color))
try:
r, g, b = color
except (TypeError, ValueError):
raise TurtleGraphicsError("bad color arguments: %s" % str(color))
if self._colormode == 1.0:
r, g, b = [round(255.0*x) for x in (r, g, b)]
if not ((0 <= r <= 255) and (0 <= g <= 255) and (0 <= b <= 255)):
raise TurtleGraphicsError("bad color sequence: %s" % str(color))
return "#%02x%02x%02x" % (r, g, b)
def _color(self, cstr):
if not cstr.startswith("#"):
return cstr
if len(cstr) == 7:
cl = [int(cstr[i:i+2], 16) for i in (1, 3, 5)]
elif len(cstr) == 4:
cl = [16*int(cstr[h], 16) for h in cstr[1:]]
else:
raise TurtleGraphicsError("bad colorstring: %s" % cstr)
return tuple(c * self._colormode/255 for c in cl)
def colormode(self, cmode=None):
"""Return the colormode or set it to 1.0 or 255.
After setting it, the r, g and b values of color triples have to
be between 0 and cmode.
Argument:
cmode -- a number or None
Example (for a TurtleScreen instance named screen):
>>> screen.colormode(1)
>>> turtle.pencolor(240, 160, 80)
Traceback (most recent call last):
...
TurtleGraphicsError: bad color sequence: (240, 160, 80)
>>> screen.colormode()
1.0
>>> screen.colormode(255)
>>> screen.colormode()
255
>>> turtle.pencolor(240,160,80)
"""
if cmode is None:
return self._colormode
if cmode == 1.0:
self._colormode = float(cmode)
elif cmode == 255:
self._colormode = int(cmode)
def reset(self):
"""Reset all turtles on the screen to their initial state.
Aliases: reset | resetscreen
As a function, this method is only available under the name
resetscreen. The function reset is derived from the Turtle method
reset().
"""
for turtle in self._turtles:
turtle._setmode(self._mode)
turtle.reset()
def turtles(self):
"""Return the list of turtles on the screen.
Example (for a TurtleScreen instance named screen):
>>> for turtle in screen.turtles():
... turtle.color("red")
"""
return self._turtles
def bgcolor(self, *args):
"""Return or set the background color of the TurtleScreen.
Four input formats are allowed:
- bgcolor()
Return the current background color as a color specification
string or as a tuple (see example). May be used as input
to another color(), pencolor(), fillcolor() or bgcolor() call.
- bgcolor(colorstring)
Set the background color to colorstring, which is a Tk color
specification string, such as "red", "yellow", or "#33cc8c".
- bgcolor((r, g, b))
Set the background color to the RGB color represented by
the tuple of r, g, and b. Each of r, g, and b must be
between 0 and colormode, where colormode is either 1.0 or 255
(see colormode()).
- bgcolor(r, g, b)
Set the background color to the RGB color represented by
r, g, and b. Each of r, g, and b must be between 0 and
colormode.
Example (for a TurtleScreen instance named screen):
>>> screen.bgcolor("orange")
>>> screen.bgcolor()
'orange'
>>> screen.colormode(255)
>>> screen.bgcolor("#800080")
>>> screen.bgcolor()
(128.0, 0.0, 128.0)
"""
if args:
color = self._colorstr(args)
else:
color = None
color = self._bgcolor(color)
if color is not None:
color = self._color(color)
return color
def tracer(self, n=None, delay=None):
"""Turn turtle animation on or off and set the drawing delay.
If n is given, only every n-th regular screen update is performed,
which can be used to speed up the drawing of complex graphics. If
n is 0, animation is turned off and the screen is only updated by
calling update(). If delay is given, it sets the drawing delay, see
delay(). When called without arguments, return the current value
of n.
Arguments:
n -- a nonnegative integer or None
delay -- a nonnegative integer or None
Example (for a TurtleScreen instance named screen):
>>> screen.tracer(8, 25)
>>> dist = 2
>>> for i in range(200):
... fd(dist)
... rt(90)
... dist += 2
"""
if n is None:
return self._tracing
self._tracing = int(n)
self._updatecounter = 0
if delay is not None:
self._delayvalue = int(delay)
if self._tracing:
self.update()
def delay(self, delay=None):
"""Return or set the drawing delay in milliseconds.
This is approximately the time interval between two consecutive
canvas updates. The longer the drawing delay, the slower the
animation.
Argument:
delay -- a nonnegative integer or None
Example (for a TurtleScreen instance named screen):
>>> screen.delay()
10
>>> screen.delay(5)
>>> screen.delay()
5
"""
if delay is None:
return self._delayvalue
self._delayvalue = int(delay)
@contextmanager
def no_animation(self):
"""Temporarily turn off turtle animation.
The code inside the with block is not animated. Once the block is
exited, the drawing appears. This is useful for drawing complex
shapes where even the fastest speed setting is too slow.
Example (for a TurtleScreen instance named screen):
>>> with screen.no_animation():
... for dist in range(2, 400, 2):
... fd(dist)
... rt(90)
"""
tracer = self.tracer()
try:
self.tracer(0)
yield
finally:
self.tracer(tracer)
def _incrementudc(self):
"""Increment the update counter."""
if not TurtleScreen._RUNNING:
TurtleScreen._RUNNING = True
raise Terminator
if self._tracing > 0:
self._updatecounter += 1
self._updatecounter %= self._tracing
def update(self):
"""Perform a TurtleScreen update."""
tracing = self._tracing
self._tracing = True
for t in self.turtles():
t._update_data()
t._drawturtle()
self._tracing = tracing
self._update()
def window_width(self):
"""Return the width of the turtle window.
Example (for a TurtleScreen instance named screen):
>>> screen.window_width()
640
"""
return self._window_size()[0]
def window_height(self):
"""Return the height of the turtle window.
Example (for a TurtleScreen instance named screen):
>>> screen.window_height()
480
"""
return self._window_size()[1]
def getcanvas(self):
"""Return the Canvas of this TurtleScreen.
Example (for a Screen instance named screen):
>>> cv = screen.getcanvas()
>>> cv
<turtle.ScrolledCanvas object ...>
"""
return self.cv
def getshapes(self):
"""Return a list of names of all currently available turtle shapes.
Example (for a TurtleScreen instance named screen):
>>> screen.getshapes()
['arrow', 'blank', 'circle', ..., 'turtle']
"""
return sorted(self._shapes.keys())
def onclick(self, fun, btn=1, add=None):
"""Bind fun to mouse-click events on this screen.
Aliases: onclick | onscreenclick
fun is called with the coordinates of the clicked point on the
canvas. If fun is None, existing bindings are removed. btn is the
number of the mouse button and defaults to 1, the left mouse
button. If add is True, a new binding is added, otherwise it
replaces a former binding. As a function, this method is only
available under the name onscreenclick. The function onclick is
derived from the Turtle method onclick.
Arguments:
fun -- a function with two arguments or None
btn -- an integer
add -- a boolean or None
Example (for a TurtleScreen instance named screen):
>>> screen.onscreenclick(turtle.goto)
>>> # Subsequently clicking into the TurtleScreen will
>>> # make the turtle move to the clicked point.
>>> screen.onscreenclick(None) # remove event binding again
"""
self._onscreenclick(fun, btn, add)
def onkey(self, fun, key):
"""Bind fun to key-release event of key.
Arguments:
fun -- a function with no arguments
key -- a string: key (e.g. "a") or key-symbol (e.g. "space")
In order to be able to register key-events, TurtleScreen
must have focus. (See method listen.)
Example (for a TurtleScreen instance named screen):
>>> def f():
... fd(50)
... lt(60)
...
>>> screen.onkey(f, "Up")
>>> screen.listen()
Subsequently the turtle can be moved by repeatedly pressing
the up-arrow key, consequently drawing a hexagon
"""
if fun is None:
if key in self._keys:
self._keys.remove(key)
elif key not in self._keys:
self._keys.append(key)
self._onkeyrelease(fun, key)
def onkeypress(self, fun, key=None):
"""Bind fun to key-press event of key if key is given,
or to any key-press-event if no key is given.
Arguments:
fun -- a function with no arguments
key -- a string: key (e.g. "a") or key-symbol (e.g. "space")
In order to be able to register key-events, TurtleScreen
must have focus. (See method listen.)
Example (for a TurtleScreen instance named screen
and a Turtle instance named turtle):
>>> def f():
... fd(50)
... lt(60)
...
>>> screen.onkeypress(f, "Up")
>>> screen.listen()
Subsequently the turtle can be moved by repeatedly pressing
the up-arrow key, or by keeping pressed the up-arrow key.
consequently drawing a hexagon.
"""
if fun is None:
if key in self._keys:
self._keys.remove(key)
elif key is not None and key not in self._keys:
self._keys.append(key)
self._onkeypress(fun, key)
def listen(self, xdummy=None, ydummy=None):
"""Set focus on TurtleScreen (in order to collect key-events)
No arguments.
Dummy arguments are provided in order
to be able to pass listen to the onclick method.
Example (for a TurtleScreen instance named screen):
>>> screen.listen()
"""
self._listen()
def ontimer(self, fun, t=0):
"""Install a timer, which calls fun after t milliseconds.
Arguments:
fun -- a function with no arguments.
t -- a number >= 0
Example (for a TurtleScreen instance named screen):
>>> running = True
>>> def f():
... if running:
... fd(50)
... lt(60)
... screen.ontimer(f, 250)
...
>>> f() # makes the turtle marching around
>>> running = False
"""
self._ontimer(fun, t)
def bgpic(self, picname=None):
"""Set background image or return name of current backgroundimage.
Optional argument:
picname -- a string, name of an image file (PNG, GIF, PGM, and PPM) or "nopic".
If picname is a filename, set the corresponding image as background.
If picname is "nopic", delete backgroundimage, if present.
If picname is None, return the filename of the current backgroundimage.
Example (for a TurtleScreen instance named screen):
>>> screen.bgpic()
'nopic'
>>> screen.bgpic("landscape.gif")
>>> screen.bgpic()
'landscape.gif'
"""
if picname is None:
return self._bgpicname
if picname not in self._bgpics:
self._bgpics[picname] = self._image(picname)
self._setbgpic(self._bgpic, self._bgpics[picname])
self._bgpicname = picname
def screensize(self, canvwidth=None, canvheight=None, bg=None):
"""Resize the canvas the turtles are drawing on.
Optional arguments:
canvwidth -- positive integer, new width of canvas in pixels
canvheight -- positive integer, new height of canvas in pixels
bg -- colorstring or color-tuple, new backgroundcolor
If no arguments are given, return current (canvaswidth, canvasheight)
Do not alter the drawing window. To observe hidden parts of
the canvas use the scrollbars. (Can make visible those parts
of a drawing, which were outside the canvas before!)
Example (for a Turtle instance named turtle):
>>> turtle.screensize(2000,1500)
>>> # e.g. to search for an erroneously escaped turtle ;-)
"""
return self._resize(canvwidth, canvheight, bg)
def save(self, filename, *, overwrite=False):
"""Save the drawing as a PostScript file
Arguments:
filename -- a string, the path of the created file.
Must end with '.ps' or '.eps'.
Optional arguments:
overwrite -- boolean, if true, then existing files will be overwritten
Example (for a TurtleScreen instance named screen):
>>> screen.save('my_drawing.eps')
"""
filename = Path(filename)
if not filename.parent.exists():
raise FileNotFoundError(
f"The directory '{filename.parent}' does not exist."
" Cannot save to it."
)
if not overwrite and filename.exists():
raise FileExistsError(
f"The file '{filename}' already exists. To overwrite it use"
" the 'overwrite=True' argument of the save function."
)
if (ext := filename.suffix) not in {".ps", ".eps"}:
raise ValueError(
f"Unknown file extension: '{ext}',"
" must be one of {'.ps', '.eps'}"
)
postscript = self.cv.postscript()
filename.write_text(postscript)
onscreenclick = onclick
resetscreen = reset
clearscreen = clear
addshape = register_shape
onkeyrelease = onkey
class TNavigator:
"""The navigation part of RawTurtle.
Implements methods for turtle movement.
"""
START_ORIENTATION = {
"standard": Vec2D(1.0, 0.0),
"world" : Vec2D(1.0, 0.0),
"logo" : Vec2D(0.0, 1.0),
}
DEFAULT_MODE = "standard"
DEFAULT_ANGLEOFFSET = 0
DEFAULT_ANGLEORIENT = 1
def __init__(self, mode=DEFAULT_MODE):
self._angleOffset = self.DEFAULT_ANGLEOFFSET
self._angleOrient = self.DEFAULT_ANGLEORIENT
self._mode = mode
self.undobuffer = None
self.degrees()
self._mode = None
self._setmode(mode)
TNavigator.reset(self)
def reset(self):
"""Reset the turtle to its initial values.
Will be overwritten by the child class.
"""
self._position = Vec2D(0.0, 0.0)
self._orient = TNavigator.START_ORIENTATION[self._mode]
def _setmode(self, mode=None):
"""Set the turtle's mode to 'standard', 'world' or 'logo'."""
if mode is None:
return self._mode
if mode not in ["standard", "logo", "world"]:
return
self._mode = mode
if mode in ["standard", "world"]:
self._angleOffset = 0
self._angleOrient = 1
else: # mode == "logo":
self._angleOffset = self._fullcircle/4.
self._angleOrient = -1
def _setDegreesPerAU(self, fullcircle):
"""Helper function for degrees() and radians()."""
self._fullcircle = fullcircle
self._degreesPerAU = 360/fullcircle
if self._mode == "standard":
self._angleOffset = 0
else:
self._angleOffset = fullcircle/4.
def degrees(self, fullcircle=360.0):
"""Set the angle measurement units to degrees.
The number of degrees in a full circle is set to fullcircle, which
defaults to 360.
Argument:
fullcircle -- a number
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0
>>> # Change angle measurement unit to grad (also known as gon,
>>> # grade, or gradian and equals 1/100-th of the right angle.)
>>> turtle.degrees(400.0)
>>> turtle.heading()
100.0
>>> turtle.degrees(360)
>>> turtle.heading()
90.0
"""
self._setDegreesPerAU(fullcircle)
def radians(self):
"""Set the angle measurement units to radians.
Equivalent to degrees(2 * math.pi).
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0
>>> turtle.radians()
>>> turtle.heading()
1.5707963267948966
"""
self._setDegreesPerAU(math.tau)
def _go(self, distance):
"""Move the turtle forward by the specified distance."""
ende = self._position + self._orient * distance
self._goto(ende)
def _rotate(self, angle):
"""Turn the turtle counterclockwise by specified angle, if the angle > 0."""
angle *= self._degreesPerAU
self._orient = self._orient.rotate(angle)
def _goto(self, end):
"""Move the turtle to the end position."""
self._position = end
@contextmanager
def _undo_sequence(self):
"""Record the enclosed actions as a single undo step."""
undobuffer = self.undobuffer
if not undobuffer or undobuffer.cumulate:
yield
return
undobuffer.push(["seq"])
undobuffer.cumulate = True
try:
yield
finally:
undobuffer.cumulate = False
def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
"""To be overwritten by the child class RawTurtle.
Includes no TPen references.
"""
new_x = x if x is not None else self._position[0]
new_y = y if y is not None else self._position[1]
self._position = Vec2D(new_x, new_y)
def forward(self, distance):
"""Move the turtle forward by the specified distance.
Aliases: forward | fd
The turtle moves in the direction it is headed.
Argument:
distance -- a number
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00,0.00)
>>> turtle.forward(25)
>>> turtle.position()
(25.00,0.00)
>>> turtle.forward(-75)
>>> turtle.position()
(-50.00,0.00)
"""
self._go(distance)
def back(self, distance):
"""Move the turtle backward by distance.
Aliases: back | backward | bk
The turtle moves opposite to the direction it is headed.
The turtle's heading does not change.
Argument:
distance -- a number
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00,0.00)
>>> turtle.backward(30)
>>> turtle.position()
(-30.00,0.00)
"""
self._go(-distance)
def right(self, angle):
"""Turn the turtle right by the specified angle.
Aliases: right | rt
The angle is measured in degrees by default; the unit can be
changed with degrees() or radians(). How the heading is measured
depends on the turtle mode, see mode().
Argument:
angle -- a number
Example (for a Turtle instance named turtle):
>>> turtle.heading()
22.0
>>> turtle.right(45)
>>> turtle.heading()
337.0
"""
self._rotate(-angle)
def left(self, angle):
"""Turn the turtle left by the specified angle.
Aliases: left | lt
The angle is measured in degrees by default; the unit can be
changed with degrees() or radians(). How the heading is measured
depends on the turtle mode, see mode().
Argument:
angle -- a number
Example (for a Turtle instance named turtle):
>>> turtle.heading()
22.0
>>> turtle.left(45)
>>> turtle.heading()
67.0
"""
self._rotate(angle)
def pos(self):
"""Return the turtle's current location (x,y) as a Vec2D vector.
Aliases: pos | position
Example (for a Turtle instance named turtle):
>>> turtle.pos()
(0.00,240.00)
"""
return self._position
def xcor(self):
"""Return the turtle's x coordinate.
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.left(50)
>>> turtle.forward(100)
>>> print(round(turtle.xcor(), 5))
64.27876
"""
return self._position[0]
def ycor(self):
"""Return the turtle's y coordinate
Example (for a Turtle instance named turtle):
>>> reset()
>>> turtle.left(60)
>>> turtle.forward(100)
>>> print(round(turtle.ycor(), 5))
86.60254
"""
return self._position[1]
def goto(self, x, y=None):
"""Move the turtle to an absolute position.
Aliases: goto | setpos | setposition
If y is None, x must be a pair of coordinates or a Vec2D, for
example as returned by pos(). If the pen is down, a line is drawn.
The turtle's heading does not change.
Arguments:
x -- a number or a pair/vector of numbers
y -- a number or None
Example (for a Turtle instance named turtle):
>>> tp = turtle.pos()
>>> tp
(0.00,0.00)
>>> turtle.goto(60,30)
>>> turtle.pos()
(60.00,30.00)
>>> turtle.goto((20,80))
>>> turtle.pos()
(20.00,80.00)
>>> turtle.goto(tp)
>>> turtle.pos()
(0.00,0.00)
"""
if y is None:
self._goto(Vec2D(*x))
else:
self._goto(Vec2D(x, y))
def home(self):
"""Move the turtle to the origin, coordinates (0,0).
The turtle's heading is set to its start orientation, which
depends on the turtle mode, see mode().
Example (for a Turtle instance named turtle):
>>> turtle.heading()
90.0
>>> turtle.position()
(0.00,-10.00)
>>> turtle.home()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
"""
self.goto(0, 0)
self.setheading(0)
def setx(self, x):
"""Set the turtle's x coordinate to x.
The y coordinate is unchanged.
Argument:
x -- a number
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00,240.00)
>>> turtle.setx(10)
>>> turtle.position()
(10.00,240.00)
"""
self._goto(Vec2D(x, self._position[1]))
def sety(self, y):
"""Set the turtle's y coordinate to y.
The x coordinate is unchanged.
Argument:
y -- a number
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00,40.00)
>>> turtle.sety(-10)
>>> turtle.position()
(0.00,-10.00)
"""
self._goto(Vec2D(self._position[0], y))
def distance(self, x, y=None):
"""Return the distance from the turtle to (x,y) in turtle step units.
If y is None, x must be a pair of coordinates, a Vec2D, for example
as returned by pos(), or another turtle.
Arguments:
x -- a number or a pair/vector of numbers or a turtle instance
y -- a number if x is a number, else None
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.distance(30,40)
50.0
>>> turtle.distance((30,40))
50.0
>>> joe = Turtle()
>>> joe.forward(77)
>>> turtle.distance(joe)
77.0
"""
if y is not None:
pos = Vec2D(x, y)
if isinstance(x, Vec2D):
pos = x
elif isinstance(x, tuple):
pos = Vec2D(*x)
elif isinstance(x, TNavigator):
pos = x._position
return abs(pos - self._position)
def towards(self, x, y=None):
"""Return the angle of the line from the turtle's position to (x,y).
If y is None, x must be a pair of coordinates, a Vec2D, for example
as returned by pos(), or another turtle. The angle is measured from
the turtle's start orientation, which depends on the turtle mode,
see mode().
Arguments:
x -- a number or a pair/vector of numbers or a turtle instance
y -- a number if x is a number, else None
Example (for a Turtle instance named turtle):
>>> turtle.goto(10, 10)
>>> turtle.towards(0,0)
225.0
"""
if y is not None:
pos = Vec2D(x, y)
if isinstance(x, Vec2D):
pos = x
elif isinstance(x, tuple):
pos = Vec2D(*x)
elif isinstance(x, TNavigator):
pos = x._position
x, y = pos - self._position
result = round(math.degrees(math.atan2(y, x)), 10) % 360.0
result /= self._degreesPerAU
return (self._angleOffset + self._angleOrient*result) % self._fullcircle
def heading(self):
"""Return the turtle's current heading.
The value depends on the turtle mode, see mode().
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.left(67)
>>> turtle.heading()
67.0
"""
x, y = self._orient
result = round(math.degrees(math.atan2(y, x)), 10) % 360.0
result /= self._degreesPerAU
return (self._angleOffset + self._angleOrient*result) % self._fullcircle
def setheading(self, to_angle):
"""Set the turtle's heading to to_angle.
Aliases: setheading | seth
Here are some common directions in degrees:
standard mode logo mode
-------------------|---------------
0 - east 0 - north
90 - north 90 - east
180 - west 180 - south
270 - south 270 - west
Argument:
to_angle -- a number
Example (for a Turtle instance named turtle):
>>> turtle.setheading(90)
>>> turtle.heading()
90.0
"""
angle = (to_angle - self.heading()) * self._angleOrient
full = self._fullcircle
angle = (angle+full/2.)%full - full/2.
self._rotate(angle)
def circle(self, radius, extent = None, steps = None):
"""Draw a circle with the given radius.
The center is radius units left of the turtle; extent, an angle,
determines which part of the circle is drawn. If extent is not
given, draw the entire circle. If extent is not a full circle, one
endpoint of the arc is the current pen position. Draw the arc in
the counterclockwise direction if radius is positive, otherwise in
the clockwise direction. Finally, the turtle's heading is changed by
extent.
As the circle is approximated by an inscribed regular polygon,
steps determines the number of steps to use. If not given, it
will be calculated automatically. May be used to draw regular
polygons.
Arguments:
radius -- a number
extent -- a number or None
steps -- an integer or None
Example (for a Turtle instance named turtle):
>>> turtle.circle(50)
>>> turtle.circle(120, 180) # draw a semicircle
"""
speed = self.speed()
if extent is None:
extent = self._fullcircle
if steps is None:
frac = abs(extent)/self._fullcircle
steps = 1 + int(min(11 + abs(radius) / 6.0, 59.0) * frac)
w = 1.0 * extent / steps
w2 = 0.5 * w
l = 2.0 * radius * math.sin(math.radians(w2)*self._degreesPerAU)
if radius < 0:
l, w, w2 = -l, -w, -w2
tr = self._tracer()
dl = self._delay()
with self._undo_sequence():
if speed == 0:
self._tracer(0, 0)
else:
self.speed(0)
self._rotate(w2)
for i in range(steps):
self.speed(speed)
self._go(l)
self.speed(0)
self._rotate(w)
self._rotate(-w2)
if speed == 0:
self._tracer(tr, dl)
self.speed(speed)
# Three dummy methods to be implemented by the child class:
def speed(self, s=0):
"""Dummy method - to be overwritten by the child class."""
def _tracer(self, a=None, b=None):
"""Dummy method - to be overwritten by the child class."""
def _delay(self, n=None):
"""Dummy method - to be overwritten by the child class."""
# Aliases for the commonly used commands:
fd = forward
bk = back
backward = back
rt = right
lt = left
position = pos
setpos = goto
setposition = goto
seth = setheading
class TPen:
"""Drawing part of the RawTurtle.
Implements drawing properties.
"""
def __init__(self, resizemode=_CFG["resizemode"]):
self._resizemode = resizemode # or "user" or "noresize"
self.undobuffer = None
TPen._reset(self)
def _reset(self, pencolor=_CFG["pencolor"],
fillcolor=_CFG["fillcolor"]):
self._pensize = 1
self._shown = True
self._pencolor = pencolor
self._fillcolor = fillcolor
self._drawing = True
self._speed = 3
self._stretchfactor = (1., 1.)
self._shearfactor = 0.
self._tilt = 0.
self._shapetrafo = (1., 0., 0., 1.)
self._outlinewidth = 1
def resizemode(self, rmode=None):
"""Set the resizemode to "auto", "user" or "noresize".
If rmode is not given, return the current resizemode. The
different resizemodes have the following effects:
- "auto": the turtle is resized according to the value of
pensize().
- "user": the turtle is resized according to the stretch factors
and outline width, which are set by shapesize().
- "noresize": the turtle is not resized.
resizemode("user") is called by shapesize() when used with
arguments.
Argument:
rmode -- a string or None
Example (for a Turtle instance named turtle):
>>> turtle.resizemode()
'noresize'
>>> turtle.resizemode("auto")
>>> turtle.resizemode()
'auto'
"""
if rmode is None:
return self._resizemode
rmode = rmode.lower()
if rmode in ["auto", "user", "noresize"]:
self.pen(resizemode=rmode)
def pensize(self, width=None):
"""Return or set the line thickness.
Aliases: pensize | width
If width is not given, return the current pensize. If resizemode
is set to "auto" and the turtle shape is a polygon, that polygon is
drawn with the same line thickness.
Argument:
width -- a positive number or None
Example (for a Turtle instance named turtle):
>>> turtle.pensize()
1
>>> turtle.pensize(10) # from here on lines of width 10 are drawn
"""
if width is None:
return self._pensize
self.pen(pensize=width)
def penup(self):
"""Lift the pen.
Aliases: penup | pu | up
The turtle does not draw when it moves.
"""
if not self._drawing:
return
self.pen(pendown=False)
def pendown(self):
"""Lower the pen.
Aliases: pendown | pd | down
The turtle draws a line when it moves.
"""
if self._drawing:
return
self.pen(pendown=True)
def isdown(self):
"""Return True if the pen is down, False if it's up.
Example (for a Turtle instance named turtle):
>>> turtle.penup()
>>> turtle.isdown()
False
>>> turtle.pendown()
>>> turtle.isdown()
True
"""
return self._drawing
def speed(self, speed=None):
"""Return or set the turtle's speed.
If speed is not given, return the current speed. Otherwise set the
turtle's speed to an integer from 0 to 10. If speed is a number
greater than 10 or smaller than 0.5, the speed is set to 0. You
can also use these names instead of numbers:
"fastest": 0
"fast": 10
"normal": 6
"slow": 3
"slowest": 1
Speeds from 1 to 10 give increasingly faster animation of line
drawing and turtle turning. A speed of 0 means that no animation
takes place: forward() and back() make the turtle jump, and
likewise left() and right() make the turtle turn instantly.
Argument:
speed -- an integer, a string or None
Example (for a Turtle instance named turtle):
>>> turtle.speed()
3
>>> turtle.speed('normal')
>>> turtle.speed()
6
>>> turtle.speed(9)
>>> turtle.speed()
9
"""
speed_strings = {
'fastest': 0,
'fast': 10,
'normal': 6,
'slow': 3,
'slowest': 1,
}
if speed is None:
return self._speed
if speed in speed_strings:
speed = speed_strings[speed]
elif 0.5 < speed < 10.5:
speed = int(round(speed))
else:
speed = 0
self.pen(speed=speed)
def color(self, *args):
"""Return or set the pencolor and fillcolor.
Several input formats are allowed. They use 0 to 3 arguments as follows:
- color()
Return the current pencolor and the current fillcolor as
a pair of color specification strings or tuples as returned
by pencolor() and fillcolor().
- color(colorstring), color((r,g,b)), color(r,g,b)
Inputs as in pencolor(). Set both the pencolor and the
fillcolor to the given value.
- color(colorstring1, colorstring2), color((r1,g1,b1), (r2,g2,b2))
Equivalent to pencolor(colorstring1) and fillcolor(colorstring2)
and analogously if the other input format is used.
If the turtle shape is a polygon, the outline and interior of that
polygon are drawn with the newly set colors. For more information,
see pencolor() and fillcolor().
Example (for a Turtle instance named turtle):
>>> turtle.color("red", "green")
>>> turtle.color()
('red', 'green')
>>> colormode(255)
>>> turtle.color("#285078", "#a0c8f0")
>>> turtle.color()
((40.0, 80.0, 120.0), (160.0, 200.0, 240.0))
"""
if args:
l = len(args)
if l == 1:
pcolor = fcolor = args[0]
elif l == 2:
pcolor, fcolor = args
elif l == 3:
pcolor = fcolor = args
pcolor = self._colorstr(pcolor)
fcolor = self._colorstr(fcolor)
self.pen(pencolor=pcolor, fillcolor=fcolor)
else:
return self._color(self._pencolor), self._color(self._fillcolor)
def pencolor(self, *args):
"""Return or set the pencolor.
Four input formats are allowed:
- pencolor()
Return the current pencolor as color specification string or
as a tuple (see example). May be used as input to another
color(), pencolor(), fillcolor() or bgcolor() call.
- pencolor(colorstring)
Set the pencolor to colorstring, which is a Tk color
specification string, such as "red", "yellow", or "#33cc8c".
- pencolor((r, g, b))
Set the pencolor to the RGB color represented by the tuple of
r, g, and b. Each of r, g, and b must be between 0 and
colormode, where colormode is either 1.0 or 255 (see
colormode()).
- pencolor(r, g, b)
Set the pencolor to the RGB color represented by r, g, and b.
Each of r, g, and b must be between 0 and colormode.
If the turtle shape is a polygon, the outline of that polygon is
drawn with the newly set pencolor.
Example (for a Turtle instance named turtle):
>>> turtle.pencolor("brown")
>>> turtle.pencolor()
'brown'
>>> colormode(255)
>>> turtle.pencolor("#32c18f")
>>> turtle.pencolor()
(50.0, 193.0, 143.0)
"""
if args:
color = self._colorstr(args)
if color == self._pencolor:
return
self.pen(pencolor=color)
else:
return self._color(self._pencolor)
def fillcolor(self, *args):
"""Return or set the fillcolor.
Four input formats are allowed:
- fillcolor()
Return the current fillcolor as color specification string,
possibly in tuple format (see example). May be used as
input to another color(), pencolor(), fillcolor() or bgcolor() call.
- fillcolor(colorstring)
Set the fillcolor to colorstring, which is a Tk color
specification string, such as "red", "yellow", or "#33cc8c".
- fillcolor((r, g, b))
Set the fillcolor to the RGB color represented by the tuple of
r, g, and b. Each of r, g, and b must be between 0 and
colormode, where colormode is either 1.0 or 255 (see
colormode()).
- fillcolor(r, g, b)
Set the fillcolor to the RGB color represented by r, g, and b.
Each of r, g, and b must be between 0 and colormode.
If the turtle shape is a polygon, the interior of that polygon is
drawn with the newly set fillcolor.
Example (for a Turtle instance named turtle):
>>> turtle.fillcolor("violet")
>>> turtle.fillcolor()
'violet'
>>> colormode(255)
>>> turtle.fillcolor("#ffffff")
>>> turtle.fillcolor()
(255.0, 255.0, 255.0)
"""
if args:
color = self._colorstr(args)
if color == self._fillcolor:
return
self.pen(fillcolor=color)
else:
return self._color(self._fillcolor)
def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
"""To be overwritten by the child class RawTurtle.
Includes no TNavigator references.
"""
pendown = self.isdown()
if pendown:
self.pen(pendown=False)
self.pen(pendown=pendown)
def showturtle(self):
"""Make the turtle visible.
Aliases: showturtle | st
"""
self.pen(shown=True)
def hideturtle(self):
"""Make the turtle invisible.
Aliases: hideturtle | ht
If the pen is down, movement still draws.
"""
self.pen(shown=False)
def isvisible(self):
"""Return True if the turtle is visible, False if it's hidden.
Example (for a Turtle instance named turtle):
>>> turtle.hideturtle()
>>> turtle.isvisible()
False
>>> turtle.showturtle()
>>> turtle.isvisible()
True
"""
return self._shown
def pen(self, pen=None, **pendict):
"""Return or set the pen's attributes.
Arguments:
pen -- a dictionary with some or all of the below listed keys.
**pendict -- one or more keyword-arguments with the below
listed keys as keywords.
Return or set the pen's attributes in a 'pen-dictionary'
with the following key/value pairs:
"shown" : True/False
"pendown" : True/False
"pencolor" : color-string or color-tuple
"fillcolor" : color-string or color-tuple
"pensize" : positive number
"speed" : number in range 0..10
"resizemode" : "auto" or "user" or "noresize"
"stretchfactor": (positive number, positive number)
"shearfactor": number
"outline" : positive number
"tilt" : number
This dictionary can be used as argument for a subsequent
pen()-call to restore the former pen-state. Moreover one
or more of these attributes can be provided as keyword-arguments.
This can be used to set several pen attributes in one statement.
Examples (for a Turtle instance named turtle):
>>> turtle.pen(fillcolor="black", pencolor="red", pensize=10)
>>> turtle.pen()
{'pensize': 10, 'shown': True, 'resizemode': 'auto', 'outline': 1,
'pencolor': 'red', 'pendown': True, 'fillcolor': 'black',
'stretchfactor': (1,1), 'speed': 3, 'shearfactor': 0.0}
>>> penstate=turtle.pen()
>>> turtle.color("yellow","")
>>> turtle.penup()
>>> turtle.pen()
{'pensize': 10, 'shown': True, 'resizemode': 'auto', 'outline': 1,
'pencolor': 'yellow', 'pendown': False, 'fillcolor': '',
'stretchfactor': (1,1), 'speed': 3, 'shearfactor': 0.0}
>>> p.pen(penstate, fillcolor="green")
>>> p.pen()
{'pensize': 10, 'shown': True, 'resizemode': 'auto', 'outline': 1,
'pencolor': 'red', 'pendown': True, 'fillcolor': 'green',
'stretchfactor': (1,1), 'speed': 3, 'shearfactor': 0.0}
"""
_pd = {"shown" : self._shown,
"pendown" : self._drawing,
"pencolor" : self._pencolor,
"fillcolor" : self._fillcolor,
"pensize" : self._pensize,
"speed" : self._speed,
"resizemode" : self._resizemode,
"stretchfactor" : self._stretchfactor,
"shearfactor" : self._shearfactor,
"outline" : self._outlinewidth,
"tilt" : self._tilt
}
if not (pen or pendict):
return _pd
if isinstance(pen, dict):
p = pen
else:
p = {}
p.update(pendict)
_p_buf = {}
for key in p:
_p_buf[key] = _pd[key]
if self.undobuffer:
self.undobuffer.push(("pen", _p_buf))
newLine = False
if "pendown" in p:
if self._drawing != p["pendown"]:
newLine = True
if "pencolor" in p:
if isinstance(p["pencolor"], tuple):
p["pencolor"] = self._colorstr((p["pencolor"],))
if self._pencolor != p["pencolor"]:
newLine = True
if "pensize" in p:
if self._pensize != p["pensize"]:
newLine = True
if newLine:
self._newLine()
if "pendown" in p:
self._drawing = p["pendown"]
if "pencolor" in p:
self._pencolor = p["pencolor"]
if "pensize" in p:
self._pensize = p["pensize"]
if "fillcolor" in p:
if isinstance(p["fillcolor"], tuple):
p["fillcolor"] = self._colorstr((p["fillcolor"],))
self._fillcolor = p["fillcolor"]
if "speed" in p:
self._speed = p["speed"]
if "resizemode" in p:
self._resizemode = p["resizemode"]
if "stretchfactor" in p:
sf = p["stretchfactor"]
if isinstance(sf, (int, float)):
sf = (sf, sf)
self._stretchfactor = sf
if "shearfactor" in p:
self._shearfactor = p["shearfactor"]
if "outline" in p:
self._outlinewidth = p["outline"]
if "shown" in p:
self._shown = p["shown"]
if "tilt" in p:
self._tilt = p["tilt"]
if "stretchfactor" in p or "tilt" in p or "shearfactor" in p:
scx, scy = self._stretchfactor
shf = self._shearfactor
sa, ca = math.sin(self._tilt), math.cos(self._tilt)
self._shapetrafo = ( scx*ca, scy*(shf*ca + sa),
-scx*sa, scy*(ca - shf*sa))
self._update()
# Three dummy methods to be implemented by the child class:
def _newLine(self, usePos = True):
"""Dummy method - to be overwritten by the child class."""
def _update(self, count=True, forced=False):
"""Dummy method - to be overwritten by the child class."""
def _color(self, args):
"""Dummy method - to be overwritten by the child class."""
def _colorstr(self, args):
"""Dummy method - to be overwritten by the child class."""
# Aliases for the commonly used commands:
width = pensize
up = penup
pu = penup
pd = pendown
down = pendown
st = showturtle
ht = hideturtle
class _TurtleImage:
"""Helper class holding the canvas items that display a turtle's shape."""
def __init__(self, screen, shapeIndex):
self.screen = screen
self._type = None
self._setshape(shapeIndex)
def _setshape(self, shapeIndex):
screen = self.screen
self.shapeIndex = shapeIndex
if self._type == "polygon" == screen._shapes[shapeIndex]._type:
return
if self._type == "image" == screen._shapes[shapeIndex]._type:
return
if self._type in ["image", "polygon"]:
screen._delete(self._item)
elif self._type == "compound":
for item in self._item:
screen._delete(item)
self._type = screen._shapes[shapeIndex]._type
if self._type == "polygon":
self._item = screen._createpoly()
elif self._type == "image":
self._item = screen._createimage(screen._shapes["blank"]._data)
elif self._type == "compound":
self._item = [screen._createpoly() for item in
screen._shapes[shapeIndex]._data]
class RawTurtle(TPen, TNavigator):
"""A turtle that draws on the given canvas or TurtleScreen.
Combines the navigation part (TNavigator) and the drawing part (TPen)
and adds the animation of the turtle on the screen.
"""
screens = []
def __init__(self, canvas=None,
shape=_CFG["shape"],
undobuffersize=_CFG["undobuffersize"],
visible=_CFG["visible"]):
if isinstance(canvas, _Screen):
self.screen = canvas
elif isinstance(canvas, TurtleScreen):
if canvas not in RawTurtle.screens:
RawTurtle.screens.append(canvas)
self.screen = canvas
elif isinstance(canvas, (ScrolledCanvas, Canvas)):
for screen in RawTurtle.screens:
if screen.cv == canvas:
self.screen = screen
break
else:
self.screen = TurtleScreen(canvas)
RawTurtle.screens.append(self.screen)
else:
raise TurtleGraphicsError("bad canvas argument %s" % canvas)
screen = self.screen
TNavigator.__init__(self, screen.mode())
TPen.__init__(self)
screen._turtles.append(self)
self.drawingLineItem = screen._createline()
self.turtle = _TurtleImage(screen, shape)
self._poly = None
self._creatingPoly = False
self._fillitem = self._fillpath = None
self._shown = visible
self._hidden_from_screen = False
self.currentLineItem = screen._createline()
self.currentLine = [self._position]
self.items = [self.currentLineItem]
self.stampItems = []
self._undobuffersize = undobuffersize
self.undobuffer = Tbuffer(undobuffersize)
self._update()
def reset(self):
"""Delete the turtle's drawings and re-center the turtle.
The turtle's settings are restored to their default values.
Example (for a Turtle instance named turtle):
>>> turtle.goto(0,-22)
>>> turtle.left(100)
>>> turtle.position()
(0.00,-22.00)
>>> turtle.heading()
100.0
>>> turtle.reset()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
"""
TNavigator.reset(self)
TPen._reset(self)
self._clear()
self._drawturtle()
self._update()
def setundobuffer(self, size):
"""Set or disable the undo buffer.
If size is an integer, an empty undo buffer of the given size is
installed. size is the maximum number of turtle actions that can
be undone by undo(). If size is None, the undo buffer is disabled.
Argument:
size -- an integer or None
Example (for a Turtle instance named turtle):
>>> turtle.setundobuffer(42)
"""
if size is None or size <= 0:
self.undobuffer = None
else:
self.undobuffer = Tbuffer(size)
def undobufferentries(self):
"""Return the number of entries in the undo buffer.
Example (for a Turtle instance named turtle):
>>> while undobufferentries():
... undo()
"""
if self.undobuffer is None:
return 0
return self.undobuffer.nr_of_items()
def _clear(self):
"""Delete all of the pen's drawings."""
self._fillitem = self._fillpath = None
for item in self.items:
self.screen._delete(item)
self.currentLineItem = self.screen._createline()
self.currentLine = []
if self._drawing:
self.currentLine.append(self._position)
self.items = [self.currentLineItem]
self.clearstamps()
self.setundobuffer(self._undobuffersize)
def clear(self):
"""Delete the turtle's drawings from the screen.
The state and position of the turtle as well as the drawings of
other turtles are not affected.
Example (for a Turtle instance named turtle):
>>> turtle.clear()
"""
self._clear()
self._update()
def _update_data(self):
self.screen._incrementudc()
if self.screen._updatecounter != 0:
return
if len(self.currentLine)>1:
self.screen._drawline(self.currentLineItem, self.currentLine,
self._pencolor, self._pensize)
def _update(self):
"""Perform a Turtle-data update."""
screen = self.screen
if screen._tracing == 0:
return
elif screen._tracing == 1:
self._update_data()
self._drawturtle()
screen._update() # TurtleScreenBase
screen._delay(screen._delayvalue) # TurtleScreenBase
else:
self._update_data()
if screen._updatecounter == 0:
for t in screen.turtles():
t._drawturtle()
screen._update()
def _tracer(self, flag=None, delay=None):
"""Forward flag and delay to the screen's tracer() method."""
return self.screen.tracer(flag, delay)
def _color(self, args):
return self.screen._color(args)
def _colorstr(self, args):
return self.screen._colorstr(args)
def _cc(self, args):
"""Convert colortriples to hexstrings."""
if isinstance(args, str):
return args
try:
r, g, b = args
except (TypeError, ValueError):
raise TurtleGraphicsError("bad color arguments: %s" % str(args))
if self.screen._colormode == 1.0:
r, g, b = [round(255.0*x) for x in (r, g, b)]
if not ((0 <= r <= 255) and (0 <= g <= 255) and (0 <= b <= 255)):
raise TurtleGraphicsError("bad color sequence: %s" % str(args))
return "#%02x%02x%02x" % (r, g, b)
def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
"""Teleport, or instantly move, the turtle to an absolute position.
Unlike goto(), no line is drawn. If x or y is not given, that
coordinate is kept as it is. The turtle's heading does not change.
If the turtle is filling a shape, the shape drawn so far is
finished and filled before teleporting, and filling starts again
at the new position. Pass fill_gap=True to keep filling one shape
instead. The teleport then counts as an edge of the shape, as it
would with goto().
Arguments:
x -- a number or None
y -- a number or None
fill_gap -- a boolean
Example (for a Turtle instance named turtle):
>>> tp = turtle.pos()
>>> tp
(0.00,0.00)
>>> turtle.teleport(60)
>>> turtle.pos()
(60.00,0.00)
>>> turtle.teleport(y=10)
>>> turtle.pos()
(60.00,10.00)
>>> turtle.teleport(20, 30)
>>> turtle.pos()
(20.00,30.00)
"""
pendown = self.isdown()
was_filling = self.filling()
with self._undo_sequence():
if pendown:
self.pen(pendown=False)
if was_filling and not fill_gap:
self.end_fill()
new_x = x if x is not None else self._position[0]
new_y = y if y is not None else self._position[1]
if self.undobuffer:
self.undobuffer.push(("teleport", self._position))
self._position = Vec2D(new_x, new_y)
self.pen(pendown=pendown)
if was_filling and not fill_gap:
self.begin_fill()
def clone(self):
"""Create and return a clone of the turtle.
The clone has the same position, heading and turtle properties.
Example:
>>> leonel = Turtle()
>>> marco = leonel.clone()
"""
screen = self.screen
self._newLine(self._drawing)
turtle = self.turtle
self.screen = None
self.turtle = None # too make self deepcopy-able
q = deepcopy(self)
self.screen = screen
self.turtle = turtle
q.screen = screen
q.turtle = _TurtleImage(screen, self.turtle.shapeIndex)
screen._turtles.append(q)
ttype = screen._shapes[self.turtle.shapeIndex]._type
if ttype == "polygon":
q.turtle._item = screen._createpoly()
elif ttype == "image":
q.turtle._item = screen._createimage(screen._shapes["blank"]._data)
elif ttype == "compound":
q.turtle._item = [screen._createpoly() for item in
screen._shapes[self.turtle.shapeIndex]._data]
q.currentLineItem = screen._createline()
q._update()
return q
def shape(self, name=None):
"""Set the turtle shape to the named shape.
If name is not given, return the name of the current shape. The
shape must exist in the TurtleScreen's shape dictionary. Initially
there are the following shapes: "arrow", "turtle", "circle",
"square", "triangle" and "classic". To add shapes, see the Screen
method register_shape().
Argument:
name -- a string or None
Example (for a Turtle instance named turtle):
>>> turtle.shape()
'classic'
>>> turtle.shape("turtle")
>>> turtle.shape()
'turtle'
"""
if name is None:
return self.turtle.shapeIndex
if not name in self.screen.getshapes():
raise TurtleGraphicsError("There is no shape named %s" % name)
self.turtle._setshape(name)
self._update()
def shapesize(self, stretch_wid=None, stretch_len=None, outline=None):
"""Return or set the turtle's stretch factors and outline width.
Aliases: shapesize | turtlesize
If no arguments are given, return the current values. Otherwise
set resizemode to "user", so that the turtle is displayed
stretched according to its stretch factors:
- stretch_wid: the stretch factor perpendicular to the turtle's
heading
- stretch_len: the stretch factor in the direction of the
turtle's heading
- outline: the width of the shape's outline
For example, shapesize(2, 1) makes the turtle twice as wide
without changing its length. If only stretch_wid is given,
stretch_len is set to the same value.
Arguments:
stretch_wid -- a positive number or None
stretch_len -- a positive number or None
outline -- a positive number or None
Example (for a Turtle instance named turtle):
>>> turtle.shapesize()
(1.0, 1.0, 1)
>>> turtle.resizemode("user")
>>> turtle.shapesize(5, 5, 12)
>>> turtle.shapesize()
(5, 5, 12)
>>> turtle.shapesize(outline=8)
>>> turtle.shapesize()
(5, 5, 8)
"""
if stretch_wid is stretch_len is outline is None:
stretch_wid, stretch_len = self._stretchfactor
return stretch_wid, stretch_len, self._outlinewidth
if stretch_wid == 0 or stretch_len == 0:
raise TurtleGraphicsError("stretch_wid/stretch_len must not be zero")
if stretch_wid is not None:
if stretch_len is None:
stretchfactor = stretch_wid, stretch_wid
else:
stretchfactor = stretch_wid, stretch_len
elif stretch_len is not None:
stretchfactor = self._stretchfactor[0], stretch_len
else:
stretchfactor = self._stretchfactor
if outline is None:
outline = self._outlinewidth
self.pen(resizemode="user",
stretchfactor=stretchfactor, outline=outline)
def shearfactor(self, shear=None):
"""Set or return the current shearfactor.
Optional argument: shear -- number, tangent of the shear angle
Shear the turtleshape according to the given shearfactor shear,
which is the tangent of the shear angle. DO NOT change the
turtle's heading (direction of movement).
If shear is not given: return the current shearfactor, i. e. the
tangent of the shear angle, by which lines parallel to the
heading of the turtle are sheared.
Examples (for a Turtle instance named turtle):
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.shearfactor(0.5)
>>> turtle.shearfactor()
>>> 0.5
"""
if shear is None:
return self._shearfactor
self.pen(resizemode="user", shearfactor=shear)
def tiltangle(self, angle=None):
"""Set or return the current tilt-angle.
Optional argument: angle -- number
Rotate the turtleshape to point in the direction specified by angle,
regardless of its current tilt-angle. DO NOT change the turtle's
heading (direction of movement).
If angle is not given: return the current tilt-angle, i. e. the angle
between the orientation of the turtleshape and the heading of the
turtle (its direction of movement).
Examples (for a Turtle instance named turtle):
>>> turtle.shape("circle")
>>> turtle.shapesize(5, 2)
>>> turtle.tiltangle()
0.0
>>> turtle.tiltangle(45)
>>> turtle.tiltangle()
45.0
>>> turtle.stamp()
>>> turtle.fd(50)
>>> turtle.tiltangle(-45)
>>> turtle.tiltangle()
315.0
>>> turtle.stamp()
>>> turtle.fd(50)
"""
if angle is None:
tilt = -math.degrees(self._tilt) * self._angleOrient
return (tilt / self._degreesPerAU) % self._fullcircle
else:
tilt = -angle * self._degreesPerAU * self._angleOrient
tilt = math.radians(tilt) % math.tau
self.pen(resizemode="user", tilt=tilt)
def tilt(self, angle):
"""Rotate the turtleshape by angle.
Argument:
angle - a number
Rotate the turtleshape by angle from its current tilt-angle,
but do NOT change the turtle's heading (direction of movement).
Examples (for a Turtle instance named turtle):
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(30)
>>> turtle.fd(50)
>>> turtle.tilt(30)
>>> turtle.fd(50)
"""
self.tiltangle(angle + self.tiltangle())
def shapetransform(self, t11=None, t12=None, t21=None, t22=None):
"""Set or return the current transformation matrix of the turtle shape.
Optional arguments: t11, t12, t21, t22 -- numbers.
If none of the matrix elements are given, return the transformation
matrix.
Otherwise set the given elements and transform the turtleshape
according to the matrix consisting of first row t11, t12 and
second row t21, 22.
Modify stretchfactor, shearfactor and tiltangle according to the
given matrix.
Examples (for a Turtle instance named turtle):
>>> turtle.shape("square")
>>> turtle.shapesize(4,2)
>>> turtle.shearfactor(-0.5)
>>> turtle.shapetransform()
(4.0, -1.0, -0.0, 2.0)
"""
if t11 is t12 is t21 is t22 is None:
return self._shapetrafo
m11, m12, m21, m22 = self._shapetrafo
if t11 is not None: m11 = t11
if t12 is not None: m12 = t12
if t21 is not None: m21 = t21
if t22 is not None: m22 = t22
if t11 * t22 - t12 * t21 == 0:
raise TurtleGraphicsError("Bad shape transform matrix: must not be singular")
self._shapetrafo = (m11, m12, m21, m22)
alfa = math.atan2(-m21, m11) % math.tau
sa, ca = math.sin(alfa), math.cos(alfa)
a11, a12, a21, a22 = (ca*m11 - sa*m21, ca*m12 - sa*m22,
sa*m11 + ca*m21, sa*m12 + ca*m22)
self._stretchfactor = a11, a22
self._shearfactor = a12/a22
self._tilt = alfa
self.pen(resizemode="user")
def _polytrafo(self, poly):
"""Computes transformed polygon shapes from a shape
according to current position and heading.
"""
screen = self.screen
p0, p1 = self._position
e0, e1 = self._orient
e = Vec2D(e0, e1 * screen.yscale / screen.xscale)
e0, e1 = (1.0 / abs(e)) * e
return [(p0+(e1*x+e0*y)/screen.xscale, p1+(-e0*x+e1*y)/screen.yscale)
for (x, y) in poly]
def get_shapepoly(self):
"""Return the current shape polygon as tuple of coordinate pairs.
No argument.
Examples (for a Turtle instance named turtle):
>>> turtle.shape("square")
>>> turtle.shapetransform(4, -1, 0, 2)
>>> turtle.get_shapepoly()
((50, -20), (30, 20), (-50, 20), (-30, -20))
"""
shape = self.screen._shapes[self.turtle.shapeIndex]
if shape._type == "polygon":
return self._getshapepoly(shape._data, shape._type == "compound")
# else return None
def _getshapepoly(self, polygon, compound=False):
"""Calculate transformed shape polygon according to resizemode
and shapetransform.
"""
if self._resizemode == "user" or compound:
t11, t12, t21, t22 = self._shapetrafo
elif self._resizemode == "auto":
l = max(1, self._pensize/5.0)
t11, t12, t21, t22 = l, 0, 0, l
elif self._resizemode == "noresize":
return polygon
return tuple((t11*x + t12*y, t21*x + t22*y) for (x, y) in polygon)
def _drawturtle(self):
"""Manages the correct rendering of the turtle with respect to
its shape, resizemode, stretch and tilt etc."""
screen = self.screen
shape = screen._shapes[self.turtle.shapeIndex]
ttype = shape._type
titem = self.turtle._item
if self._shown and screen._updatecounter == 0 and screen._tracing > 0:
self._hidden_from_screen = False
tshape = shape._data
if ttype == "polygon":
if self._resizemode == "noresize": w = 1
elif self._resizemode == "auto": w = self._pensize
else: w =self._outlinewidth
shape = self._polytrafo(self._getshapepoly(tshape))
fc, oc = self._fillcolor, self._pencolor
screen._drawpoly(titem, shape, fill=fc, outline=oc,
width=w, top=True)
elif ttype == "image":
screen._drawimage(titem, self._position, tshape)
elif ttype == "compound":
for item, (poly, fc, oc) in zip(titem, tshape):
poly = self._polytrafo(self._getshapepoly(poly, True))
screen._drawpoly(item, poly, fill=self._cc(fc),
outline=self._cc(oc), width=self._outlinewidth, top=True)
else:
if self._hidden_from_screen:
return
if ttype == "polygon":
screen._drawpoly(titem, ((0, 0), (0, 0), (0, 0)), "", "")
elif ttype == "image":
screen._drawimage(titem, self._position,
screen._shapes["blank"]._data)
elif ttype == "compound":
for item in titem:
screen._drawpoly(item, ((0, 0), (0, 0), (0, 0)), "", "")
self._hidden_from_screen = True
############################## stamp stuff ###############################
def stamp(self):
"""Stamp a copy of the turtleshape onto the canvas and return its id.
No argument.
Stamp a copy of the turtle shape onto the canvas at the current
turtle position. Return a stamp_id for that stamp, which can be
used to delete it by calling clearstamp(stamp_id).
Example (for a Turtle instance named turtle):
>>> turtle.color("blue")
>>> turtle.stamp()
13
>>> turtle.fd(50)
"""
screen = self.screen
shape = screen._shapes[self.turtle.shapeIndex]
ttype = shape._type
tshape = shape._data
if ttype == "polygon":
stitem = screen._createpoly()
if self._resizemode == "noresize": w = 1
elif self._resizemode == "auto": w = self._pensize
else: w =self._outlinewidth
shape = self._polytrafo(self._getshapepoly(tshape))
fc, oc = self._fillcolor, self._pencolor
screen._drawpoly(stitem, shape, fill=fc, outline=oc,
width=w, top=True)
elif ttype == "image":
stitem = screen._createimage("")
screen._drawimage(stitem, self._position, tshape)
elif ttype == "compound":
stitem = []
for element in tshape:
item = screen._createpoly()
stitem.append(item)
stitem = tuple(stitem)
for item, (poly, fc, oc) in zip(stitem, tshape):
poly = self._polytrafo(self._getshapepoly(poly, True))
screen._drawpoly(item, poly, fill=self._cc(fc),
outline=self._cc(oc), width=self._outlinewidth, top=True)
self.stampItems.append(stitem)
if self.undobuffer:
self.undobuffer.push(("stamp", stitem))
return stitem
def _clearstamp(self, stampid):
"""Does the work for clearstamp() and clearstamps()."""
if stampid in self.stampItems:
if isinstance(stampid, tuple):
for subitem in stampid:
self.screen._delete(subitem)
else:
self.screen._delete(stampid)
self.stampItems.remove(stampid)
# Delete stampitem from undobuffer if necessary
# if clearstamp is called directly.
if self.undobuffer:
self.undobuffer.remove(("stamp", stampid))
def clearstamp(self, stampid):
"""Delete stamp with given stampid
Argument:
stampid - an integer, must be return value of previous stamp() call.
Example (for a Turtle instance named turtle):
>>> turtle.color("blue")
>>> astamp = turtle.stamp()
>>> turtle.fd(50)
>>> turtle.clearstamp(astamp)
"""
self._clearstamp(stampid)
self._update()
def clearstamps(self, n=None):
"""Delete all or first/last n of turtle's stamps.
Optional argument:
n -- an integer
If n is None, delete all of pen's stamps,
else if n > 0 delete first n stamps
else if n < 0 delete last n stamps.
Example (for a Turtle instance named turtle):
>>> for i in range(8):
... turtle.stamp(); turtle.fd(30)
...
>>> turtle.clearstamps(2)
>>> turtle.clearstamps(-2)
>>> turtle.clearstamps()
"""
if n is None:
toDelete = self.stampItems[:]
elif n >= 0:
toDelete = self.stampItems[:n]
else:
toDelete = self.stampItems[n:]
for item in toDelete:
self._clearstamp(item)
self._update()
def _goto(self, end):
"""Move the pen to the point end, thereby drawing a line
if pen is down. All other methods for turtle movement depend
on this one.
"""
## Version with undo-stuff
go_modes = ( self._drawing,
self._pencolor,
self._pensize,
isinstance(self._fillpath, list))
screen = self.screen
undo_entry = ("go", self._position, end, go_modes,
(self.currentLineItem,
self.currentLine[:],
screen._pointlist(self.currentLineItem),
self.items[:])
)
if self.undobuffer:
self.undobuffer.push(undo_entry)
start = self._position
if self._speed and screen._tracing == 1:
diff = (end-start)
diffsq = (diff[0]*screen.xscale)**2 + (diff[1]*screen.yscale)**2
nhops = 1+int((diffsq**0.5)/(3*(1.1**self._speed)*self._speed))
delta = diff * (1.0/nhops)
for n in range(1, nhops):
if n == 1:
top = True
else:
top = False
self._position = start + delta * n
if self._drawing:
screen._drawline(self.drawingLineItem,
(start, self._position),
self._pencolor, self._pensize, top)
self._update()
if self._drawing:
screen._drawline(self.drawingLineItem, ((0, 0), (0, 0)),
fill="", width=self._pensize)
# Turtle now at end,
if self._drawing: # now update currentLine
self.currentLine.append(end)
if isinstance(self._fillpath, list):
self._fillpath.append(end)
###### vererbung!!!!!!!!!!!!!!!!!!!!!!
self._position = end
if self._creatingPoly:
self._poly.append(end)
if len(self.currentLine) > 42: # 42! answer to the ultimate question
# of life, the universe and everything
self._newLine()
self._update() #count=True)
def _undogoto(self, entry):
"""Reverse a _goto(). Used for undo()."""
old, new, go_modes, coodata = entry
drawing, pc, ps, filling = go_modes
cLI, cL, pl, items = coodata
screen = self.screen
if abs(self._position - new) > 0.5:
print ("undogoto: HALLO-DA-STIMMT-WAS-NICHT!")
# restore former situation
self.currentLineItem = cLI
self.currentLine = cL
if pl == [(0, 0), (0, 0)]:
usepc = ""
else:
usepc = pc
screen._drawline(cLI, pl, fill=usepc, width=ps)
todelete = [i for i in self.items if (i not in items) and
(screen._type(i) == "line")]
for i in todelete:
screen._delete(i)
self.items.remove(i)
start = old
if self._speed and screen._tracing == 1:
diff = old - new
diffsq = (diff[0]*screen.xscale)**2 + (diff[1]*screen.yscale)**2
nhops = 1+int((diffsq**0.5)/(3*(1.1**self._speed)*self._speed))
delta = diff * (1.0/nhops)
for n in range(1, nhops):
if n == 1:
top = True
else:
top = False
self._position = new + delta * n
if drawing:
screen._drawline(self.drawingLineItem,
(start, self._position),
pc, ps, top)
self._update()
if drawing:
screen._drawline(self.drawingLineItem, ((0, 0), (0, 0)),
fill="", width=ps)
# Turtle now at position old,
self._position = old
## if undo is done during creating a polygon, the last vertex
## will be deleted. if the polygon is entirely deleted,
## creatingPoly will be set to False.
## Polygons created before the last one will not be affected by undo()
if self._creatingPoly:
if len(self._poly) > 0:
self._poly.pop()
if self._poly == []:
self._creatingPoly = False
self._poly = None
if filling:
if self._fillpath == []:
self._fillpath = None
print("Unwahrscheinlich in _undogoto!")
elif self._fillpath is not None:
self._fillpath.pop()
self._update() #count=True)
def _rotate(self, angle):
"""Turns pen clockwise by angle."""
if self.undobuffer:
self.undobuffer.push(("rot", angle, self._degreesPerAU))
angle *= self._degreesPerAU
neworient = self._orient.rotate(angle)
tracing = self.screen._tracing
if tracing == 1 and self._speed > 0:
anglevel = 3.0 * self._speed
steps = 1 + int(abs(angle)/anglevel)
delta = 1.0*angle/steps
for _ in range(steps):
self._orient = self._orient.rotate(delta)
self._update()
self._orient = neworient
self._update()
def _newLine(self, usePos=True):
"""Closes the current line item and starts a new one.
If the current line becomes too long, animation performance (via _drawline)
can slow down considerably.
"""
if len(self.currentLine) > 1:
self.screen._drawline(self.currentLineItem, self.currentLine,
self._pencolor, self._pensize)
self.currentLineItem = self.screen._createline()
self.items.append(self.currentLineItem)
else:
self.screen._drawline(self.currentLineItem, top=True)
self.currentLine = []
if usePos:
self.currentLine = [self._position]
def filling(self):
"""Return True if the turtle is filling, False otherwise.
Example (for a Turtle instance named turtle):
>>> turtle.begin_fill()
>>> if turtle.filling():
... turtle.pensize(5)
... else:
... turtle.pensize(3)
"""
return isinstance(self._fillpath, list)
@contextmanager
def fill(self):
"""A context manager for filling a shape.
Implicitly ensures the code block is wrapped with
begin_fill() and end_fill().
Example (for a Turtle instance named turtle):
>>> turtle.color("black", "red")
>>> with turtle.fill():
... turtle.circle(60)
"""
self.begin_fill()
try:
yield
finally:
self.end_fill()
def begin_fill(self):
"""Called just before drawing a shape to be filled.
No argument.
Example (for a Turtle instance named turtle):
>>> turtle.color("black", "red")
>>> turtle.begin_fill()
>>> turtle.circle(60)
>>> turtle.end_fill()
"""
if not self.filling():
self._fillitem = self.screen._createpoly()
self.items.append(self._fillitem)
self._fillpath = [self._position]
self._newLine()
if self.undobuffer:
self.undobuffer.push(("beginfill", self._fillitem))
self._update()
def end_fill(self):
"""Fill the shape drawn after the call begin_fill().
No argument.
Example (for a Turtle instance named turtle):
>>> turtle.color("black", "red")
>>> turtle.begin_fill()
>>> turtle.circle(60)
>>> turtle.end_fill()
"""
if self.filling():
if len(self._fillpath) > 2:
self.screen._drawpoly(self._fillitem, self._fillpath,
fill=self._fillcolor)
if self.undobuffer:
self.undobuffer.push(("dofill", self._fillitem))
self._fillitem = self._fillpath = None
self._update()
def dot(self, size=None, *color):
"""Draw a circular dot with diameter size, using color.
If size is not given, the larger of pensize + 4 and 2 * pensize is
used. If color is not given, the current pencolor is used.
Arguments:
size -- a positive integer or None
color -- a colorstring or a numeric color tuple
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.dot()
>>> turtle.fd(50); turtle.dot(20, "blue"); turtle.fd(50)
"""
if not color:
if isinstance(size, (str, tuple)):
color = self._colorstr(size)
size = self._pensize + max(self._pensize, 4)
else:
color = self._pencolor
if not size:
size = self._pensize + max(self._pensize, 4)
else:
if size is None:
size = self._pensize + max(self._pensize, 4)
color = self._colorstr(color)
# If screen were to gain a dot function, see GH #104218.
pen = self.pen()
with self._undo_sequence():
try:
if self.resizemode() == 'auto':
self.ht()
self.pendown()
self.pensize(size)
self.pencolor(color)
self.forward(0)
finally:
self.pen(pen)
def _write(self, txt, align, font):
"""Performs the writing for write()
"""
item, end = self.screen._write(self._position, txt, align, font,
self._pencolor)
self._update()
self.items.append(item)
if self.undobuffer:
self.undobuffer.push(("wri", item))
return end
def write(self, arg, move=False, align="left", font=("Arial", 8, "normal")):
"""Write text at the current turtle position.
Arguments:
arg -- info, which is to be written to the TurtleScreen
move (optional) -- True/False
align (optional) -- one of the strings "left", "center" or right"
font (optional) -- a triple (fontname, fontsize, fonttype)
Write text - the string representation of arg - at the current
turtle position according to align ("left", "center" or right")
and with the given font.
If move is True, the pen is moved to the bottom-right corner
of the text. By default, move is False.
Example (for a Turtle instance named turtle):
>>> turtle.write('Home = ', True, align="center")
>>> turtle.write((0,0), True)
"""
with self._undo_sequence():
end = self._write(str(arg), align.lower(), font)
if move:
x, y = self.pos()
self.setpos(end, y)
@contextmanager
def poly(self):
"""A context manager for recording the vertices of a polygon.
Implicitly ensures that the code block is wrapped with
begin_poly() and end_poly()
Example (for a Turtle instance named turtle) where we create a
triangle as the polygon and move the turtle 100 steps forward:
>>> with turtle.poly():
... for side in range(3)
... turtle.forward(50)
... turtle.right(60)
>>> turtle.forward(100)
"""
self.begin_poly()
try:
yield
finally:
self.end_poly()
def begin_poly(self):
"""Start recording the vertices of a polygon.
The current turtle position is the first vertex of the polygon.
"""
self._poly = [self._position]
self._creatingPoly = True
def end_poly(self):
"""Stop recording the vertices of a polygon.
The current turtle position is the last vertex of the polygon.
This will be connected with the first vertex.
"""
self._creatingPoly = False
def get_poly(self):
"""Return the last recorded polygon.
Example (for a Turtle instance named turtle):
>>> turtle.home()
>>> turtle.begin_poly()
>>> turtle.fd(100)
>>> turtle.left(20)
>>> turtle.fd(30)
>>> turtle.left(60)
>>> turtle.fd(50)
>>> turtle.end_poly()
>>> p = turtle.get_poly()
>>> register_shape("myFavouriteShape", p)
"""
# Check if there are any poly?
if self._poly is not None:
return tuple(self._poly)
def getscreen(self):
"""Return the TurtleScreen object the turtle is drawing on.
So TurtleScreen-methods can be called for that object.
Example (for a Turtle instance named turtle):
>>> ts = turtle.getscreen()
>>> ts
<turtle.TurtleScreen object at ...>
>>> ts.bgcolor("pink")
"""
return self.screen
def getturtle(self):
"""Return the Turtle object itself.
Aliases: getturtle | getpen
Call getturtle() to get the turtle used by functions such as
forward() and left().
Example:
>>> pet = getturtle()
>>> pet.fd(50)
>>> pet
<turtle.Turtle object at 0x...>
"""
return self
getpen = getturtle
################################################################
### screen oriented methods recurring to methods of TurtleScreen
################################################################
def _delay(self, delay=None):
"""Set the delay which determines the speed of turtle animation."""
return self.screen.delay(delay)
def onclick(self, fun, btn=1, add=None):
"""Bind fun to mouse-click events on this turtle.
fun is called with the coordinates of the clicked point on the
canvas. If fun is None, existing bindings are removed. btn is the
number of the mouse button and defaults to 1, the left mouse
button. If add is True, a new binding is added, otherwise it
replaces a former binding.
Arguments:
fun -- a function with two arguments or None
btn -- an integer
add -- a boolean or None
Example for the anonymous turtle, that is, the procedural way:
>>> def turn(x, y):
... left(180)
...
>>> onclick(turn) # Now clicking into the turtle will turn it.
>>> onclick(None) # event-binding will be removed
"""
self.screen._onclick(self.turtle._item, fun, btn, add)
self._update()
def onrelease(self, fun, btn=1, add=None):
"""Bind fun to mouse-button-release event on this turtle on canvas.
Arguments:
fun -- a function with two arguments, to which will be assigned
the coordinates of the clicked point on the canvas.
btn -- number of the mouse-button defaults to 1 (left mouse button).
Example (for a MyTurtle instance named joe):
>>> class MyTurtle(Turtle):
... def glow(self,x,y):
... self.fillcolor("red")
... def unglow(self,x,y):
... self.fillcolor("")
...
>>> joe = MyTurtle()
>>> joe.onclick(joe.glow)
>>> joe.onrelease(joe.unglow)
Clicking on joe turns fillcolor red, unclicking turns it to
transparent.
"""
self.screen._onrelease(self.turtle._item, fun, btn, add)
self._update()
def ondrag(self, fun, btn=1, add=None):
"""Bind fun to mouse-move event on this turtle on canvas.
Arguments:
fun -- a function with two arguments, to which will be assigned
the coordinates of the clicked point on the canvas.
btn -- number of the mouse-button defaults to 1 (left mouse button).
Every sequence of mouse-move-events on a turtle is preceded by a
mouse-click event on that turtle.
Example (for a Turtle instance named turtle):
>>> turtle.ondrag(turtle.goto)
Subsequently clicking and dragging a Turtle will move it
across the screen thereby producing handdrawings (if pen is
down).
"""
self.screen._ondrag(self.turtle._item, fun, btn, add)
def _undo(self, action, data):
"""Does the main part of the work for undo()."""
if self.undobuffer is None:
return
if action == "rot":
angle, degPAU = data
self._rotate(-angle*degPAU/self._degreesPerAU)
self.undobuffer.pop()
elif action == "stamp":
stitem = data[0]
self.clearstamp(stitem)
elif action == "go":
self._undogoto(data)
elif action == "teleport":
self._position = data[0]
self._update()
elif action in ["wri", "dot"]:
item = data[0]
self.screen._delete(item)
self.items.remove(item)
elif action == "dofill":
item = data[0]
self.screen._drawpoly(item, ((0, 0),(0, 0),(0, 0)),
fill="", outline="")
elif action == "beginfill":
item = data[0]
self._fillitem = self._fillpath = None
if item in self.items:
self.screen._delete(item)
self.items.remove(item)
elif action == "pen":
TPen.pen(self, data[0])
self.undobuffer.pop()
def undo(self):
"""undo (repeatedly) the last turtle action.
No argument.
undo (repeatedly) the last turtle action.
Number of available undo actions is determined by the size of
the undobuffer.
Example (for a Turtle instance named turtle):
>>> for i in range(4):
... turtle.fd(50); turtle.lt(80)
...
>>> for i in range(8):
... turtle.undo()
...
"""
if self.undobuffer is None:
return
item = self.undobuffer.pop()
action = item[0]
data = item[1:]
if action == "seq":
while data:
item = data.pop()
self._undo(item[0], item[1:])
else:
self._undo(action, data)
turtlesize = shapesize
RawPen = RawTurtle
### Screen - Singleton ########################
def Screen():
"""Return the single screen object.
If it does not exist yet, create it. Otherwise return the existing one.
"""
if Turtle._screen is None:
Turtle._screen = _Screen()
return Turtle._screen
class _Screen(TurtleScreen):
_root = None
_canvas = None
_title = _CFG["title"]
def __init__(self):
if _Screen._root is None:
_Screen._root = self._root = _Root()
self._root.title(_Screen._title)
self._root.ondestroy(self._destroy)
if _Screen._canvas is None:
width = _CFG["width"]
height = _CFG["height"]
canvwidth = _CFG["canvwidth"]
canvheight = _CFG["canvheight"]
leftright = _CFG["leftright"]
topbottom = _CFG["topbottom"]
self._root.setupcanvas(width, height, canvwidth, canvheight)
_Screen._canvas = self._root._getcanvas()
TurtleScreen.__init__(self, _Screen._canvas)
self.setup(width, height, leftright, topbottom)
def setup(self, width=_CFG["width"], height=_CFG["height"],
startx=_CFG["leftright"], starty=_CFG["topbottom"]):
""" Set the size and position of the main window.
Arguments:
width: as integer a size in pixels, as float a fraction of the screen.
Default is 50% of screen.
height: as integer the height in pixels, as float a fraction of the
screen. Default is 75% of screen.
startx: if positive, starting position in pixels from the left
edge of the screen, if negative from the right edge
Default, startx=None is to center window horizontally.
starty: if positive, starting position in pixels from the top
edge of the screen, if negative from the bottom edge
Default, starty=None is to center window vertically.
Examples (for a Screen instance named screen):
>>> screen.setup (width=200, height=200, startx=0, starty=0)
sets window to 200x200 pixels, in upper left of screen
>>> screen.setup(width=.75, height=0.5, startx=None, starty=None)
sets window to 75% of screen by 50% of screen and centers
"""
if not hasattr(self._root, "set_geometry"):
return
sw = self._root.win_width()
sh = self._root.win_height()
if isinstance(width, float) and 0 <= width <= 1:
width = sw*width
if startx is None:
startx = (sw - width) / 2
if isinstance(height, float) and 0 <= height <= 1:
height = sh*height
if starty is None:
starty = (sh - height) / 2
self._root.set_geometry(width, height, startx, starty)
self.update()
def title(self, titlestring):
"""Set the title of the turtle window to titlestring.
The title is shown in the title bar of the turtle graphics window.
This is a method of the Screen class. It is not available for
TurtleScreen objects.
Argument:
titlestring -- a string
Example (for a Screen instance named screen):
>>> screen.title("Welcome to the turtle zoo!")
"""
if _Screen._root is not None:
_Screen._root.title(titlestring)
_Screen._title = titlestring
def _destroy(self):
root = self._root
if root is _Screen._root:
Turtle._pen = None
Turtle._screen = None
_Screen._root = None
_Screen._canvas = None
TurtleScreen._RUNNING = False
root.destroy()
def bye(self):
"""Close the turtle graphics window."""
self._destroy()
def exitonclick(self):
"""Go into mainloop until the mouse is clicked.
No arguments.
Bind bye() method to mouseclick on TurtleScreen.
If "using_IDLE" - value in configuration dictionary is False
(default value), enter mainloop.
If IDLE with -n switch (no subprocess) is used, this value should be
set to True in turtle.cfg. In this case IDLE's mainloop
is active also for the client script.
This is a method of the Screen-class and not available for
TurtleScreen instances.
Example (for a Screen instance named screen):
>>> screen.exitonclick()
"""
def exitGracefully(x, y):
"""Screen.bye() with two dummy-parameters"""
self.bye()
self.onclick(exitGracefully)
if _CFG["using_IDLE"]:
return
try:
mainloop()
except AttributeError:
exit(0)
class Turtle(RawTurtle):
"""RawTurtle auto-creating (scrolled) canvas.
When a Turtle object is created or a function derived from some
Turtle method is called a TurtleScreen object is automatically created.
"""
_pen = None
_screen = None
def __init__(self,
shape=_CFG["shape"],
undobuffersize=_CFG["undobuffersize"],
visible=_CFG["visible"]):
if Turtle._screen is None:
Turtle._screen = Screen()
RawTurtle.__init__(self, Turtle._screen,
shape=shape,
undobuffersize=undobuffersize,
visible=visible)
Pen = Turtle
def write_docstringdict(filename="turtle_docstringdict"):
"""Create and write docstring-dictionary to file.
Optional argument:
filename -- a string, used as filename
default value is turtle_docstringdict
Has to be called explicitly, (not used by the turtle-graphics classes)
The docstring dictionary will be written to the Python script <filename>.py
It is intended to serve as a template for translation of the docstrings
into different languages.
"""
docsdict = {}
for methodname in _tg_screen_functions:
key = "_Screen."+methodname
docsdict[key] = eval(key).__doc__
for methodname in _tg_turtle_functions:
key = "Turtle."+methodname
docsdict[key] = eval(key).__doc__
with open("%s.py" % filename,"w") as f:
keys = sorted(x for x in docsdict
if x.split('.')[1] not in _alias_list)
f.write('docsdict = {\n\n')
for key in keys[:-1]:
f.write('%s :\n' % repr(key))
f.write(' """%s\n""",\n\n' % docsdict[key])
key = keys[-1]
f.write('%s :\n' % repr(key))
f.write(' """%s\n"""\n\n' % docsdict[key])
f.write("}\n")
f.close()
def read_docstrings(lang):
"""Read in docstrings from a language-specific docstring dictionary.
Transfer docstrings, translated to lang, from a dictionary-file
to the methods of classes Screen and Turtle and - in revised form -
to the corresponding functions.
Entries naming a method which does not exist in this version are
ignored.
"""
module = __import__(f"turtle_docstringdict_{lang.lower()}")
docsdict = module.docsdict
for key in docsdict:
try:
# eval(key).im_func.__doc__ = docsdict[key]
eval(key).__doc__ = docsdict[key]
except AttributeError:
pass
except Exception:
print("Bad docstring-entry: %s" % key)
_LANGUAGE = _CFG["language"]
if not sys.flags.ignore_environment:
_LANGUAGE = environ.get("PYTHON_TURTLE_LANG") or _LANGUAGE
try:
if _LANGUAGE != "english":
read_docstrings(_LANGUAGE)
except ImportError:
print("Cannot find docsdict for", _LANGUAGE)
except Exception:
print ("Unknown Error when trying to import %s-docstring-dictionary" %
_LANGUAGE)
def getmethparlist(ob):
"""Get strings describing the arguments for the given object
Returns a pair of strings representing function parameter lists
including parenthesis. The first string is suitable for use in
function definition and the second is suitable for use in function
call. The "self" parameter is not included.
"""
orig_sig = inspect.signature(ob)
# bit of a hack for methods - turn it into a function
# but we drop the "self" param.
# Try and build one for Python defined functions
func_sig = orig_sig.replace(
parameters=list(orig_sig.parameters.values())[1:],
)
call_args = []
for param in func_sig.parameters.values():
match param.kind:
case (
inspect.Parameter.POSITIONAL_ONLY
| inspect.Parameter.POSITIONAL_OR_KEYWORD
):
call_args.append(param.name)
case inspect.Parameter.VAR_POSITIONAL:
call_args.append(f'*{param.name}')
case inspect.Parameter.KEYWORD_ONLY:
call_args.append(f'{param.name}={param.name}')
case inspect.Parameter.VAR_KEYWORD:
call_args.append(f'**{param.name}')
case _:
raise RuntimeError('Unsupported parameter kind', param.kind)
call_text = f'({', '.join(call_args)})'
return str(func_sig), call_text
def _turtle_docrevise(docstr):
"""To reduce docstrings from the RawTurtle class for functions."""
import re
if docstr is None:
return None
turtlename = _CFG["exampleturtle"]
newdocstr = docstr.replace("%s." % turtlename,"")
parexp = re.compile(r' \(.+ %s\):' % turtlename)
newdocstr = parexp.sub(":", newdocstr)
return newdocstr
def _screen_docrevise(docstr):
"""To reduce docstrings from the TurtleScreen class for functions."""
import re
if docstr is None:
return None
screenname = _CFG["examplescreen"]
newdocstr = docstr.replace("%s." % screenname,"")
parexp = re.compile(r' \(.+ %s\):' % screenname)
newdocstr = parexp.sub(":", newdocstr)
return newdocstr
## The following mechanism makes all methods of RawTurtle and Turtle available
## as functions. So we can enhance, change, add, delete methods to these
## classes and do not need to change anything here.
__func_body = """\
def {name}{paramslist}:
if {obj} is None:
if not TurtleScreen._RUNNING:
TurtleScreen._RUNNING = True
raise Terminator
{obj} = {init}
try:
return {obj}.{name}{argslist}
except TK.TclError:
if not TurtleScreen._RUNNING:
TurtleScreen._RUNNING = True
raise Terminator
raise
"""
def _make_global_funcs(functions, cls, obj, init, docrevise):
for methodname in functions:
method = getattr(cls, methodname)
pl1, pl2 = getmethparlist(method)
if pl1 == "":
print(">>>>>>", pl1, pl2)
continue
defstr = __func_body.format(obj=obj, init=init, name=methodname,
paramslist=pl1, argslist=pl2)
exec(defstr, globals())
globals()[methodname].__doc__ = docrevise(method.__doc__)
_make_global_funcs(_tg_screen_functions, _Screen,
'Turtle._screen', 'Screen()', _screen_docrevise)
_make_global_funcs(_tg_turtle_functions, Turtle,
'Turtle._pen', 'Turtle()', _turtle_docrevise)
done = mainloop
if __name__ == "__main__":
def switchpen():
if isdown():
pu()
else:
pd()
def demo1():
"""Demo of old turtle.py - module"""
reset()
tracer(True)
up()
backward(100)
down()
# draw 3 squares; the last filled
width(3)
for i in range(3):
if i == 2:
begin_fill()
for _ in range(4):
forward(20)
left(90)
if i == 2:
color("maroon")
end_fill()
up()
forward(30)
down()
width(1)
color("black")
# move out of the way
tracer(False)
up()
right(90)
forward(100)
right(90)
forward(100)
right(180)
down()
# some text
write("startstart", 1)
write("start", 1)
color("red")
# staircase
for i in range(5):
forward(20)
left(90)
forward(20)
right(90)
# filled staircase
tracer(True)
begin_fill()
for i in range(5):
forward(20)
left(90)
forward(20)
right(90)
end_fill()
# more text
def demo2():
"""Demo of some new features."""
speed(1)
st()
pensize(3)
setheading(towards(0, 0))
radius = distance(0, 0)/2.0
rt(90)
for _ in range(18):
switchpen()
circle(radius, 10)
write("wait a moment...")
while undobufferentries():
undo()
reset()
lt(90)
colormode(255)
laenge = 10
pencolor("green")
pensize(3)
lt(180)
for i in range(-2, 16):
if i > 0:
begin_fill()
fillcolor(255-15*i, 0, 15*i)
for _ in range(3):
fd(laenge)
lt(120)
end_fill()
laenge += 10
lt(15)
speed((speed()+1)%12)
#end_fill()
lt(120)
pu()
fd(70)
rt(30)
pd()
color("red","yellow")
speed(0)
begin_fill()
for _ in range(4):
circle(50, 90)
rt(90)
fd(30)
rt(90)
end_fill()
lt(90)
pu()
fd(30)
pd()
shape("turtle")
tri = getturtle()
tri.resizemode("auto")
turtle = Turtle()
turtle.resizemode("auto")
turtle.shape("turtle")
turtle.reset()
turtle.left(90)
turtle.speed(0)
turtle.up()
turtle.goto(280, 40)
turtle.lt(30)
turtle.down()
turtle.speed(6)
turtle.color("blue","orange")
turtle.pensize(2)
tri.speed(6)
setheading(towards(turtle))
count = 1
while tri.distance(turtle) > 4:
turtle.fd(3.5)
turtle.lt(0.6)
tri.setheading(tri.towards(turtle))
tri.fd(4)
if count % 20 == 0:
turtle.stamp()
tri.stamp()
switchpen()
count += 1
tri.write("CAUGHT! ", font=("Arial", 16, "bold"), align="right")
tri.pencolor("black")
tri.pencolor("red")
def baba(xdummy, ydummy):
clearscreen()
bye()
time.sleep(2)
while undobufferentries():
tri.undo()
turtle.undo()
tri.fd(50)
tri.write(" Click me!", font = ("Courier", 12, "bold") )
tri.onclick(baba, 1)
demo1()
demo2()
exitonclick()
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