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Edit File: turtle.py

# # turtle.py: a Tkinter based turtle graphics module for Python # Version 1.0.1 - 24. 9. 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. """ Turtle graphics is a popular way for introducing programming to kids. It was part of the original Logo programming language developed by Wally Feurzig and Seymour Papert in 1966. Imagine a robotic turtle starting at (0, 0) in the x-y plane. After an ``import turtle``, give it the command turtle.forward(15), and it moves (on-screen!) 15 pixels in the direction it is facing, drawing a line as it moves. Give it the command turtle.right(25), and it rotates in-place 25 degrees clockwise. By combining together these and similar commands, intricate shapes and pictures can easily be drawn. ----- turtle.py This module is an extended reimplementation of turtle.py from the Python standard distribution up to Python 2.5. (See: http://www.python.org) It tries to keep the merits of turtle.py and to be (nearly) 100% compatible with it. This means in the first place to enable the learning programmer to use all the commands, classes and methods interactively when using the module from within IDLE run with the -n switch. Roughly it has the following features added: - Better animation of the turtle movements, especially of turning the turtle. So the turtles can more easily be used as a visual feedback instrument by the (beginning) programmer. - Different turtle shapes, gif-images as turtle shapes, user defined and user controllable turtle shapes, among them compound (multicolored) shapes. Turtle shapes can be stretched and tilted, which makes turtles very versatile geometrical objects. - Fine control over turtle movement and screen updates via delay(), and enhanced tracer() and speed() methods. - Aliases for the most commonly used commands, like fd for forward etc., following the early Logo traditions. This reduces the boring work of typing long sequences of commands, which often occur in a natural way when kids try to program fancy pictures on their first encounter with turtle graphics. - Turtles now have an undo()-method with configurable undo-buffer. - Some simple commands/methods for creating event driven programs (mouse-, key-, timer-events). Especially useful for programming games. - A scrollable Canvas class. The default scrollable Canvas can be extended interactively as needed while playing around with the turtle(s). - A TurtleScreen class with methods controlling background color or background image, window and canvas size and other properties of the TurtleScreen. - There is a method, setworldcoordinates(), to install a user defined coordinate-system for the TurtleScreen. - The implementation uses a 2-vector class named Vec2D, derived from tuple. This class is public, so it can be imported by the application programmer, which makes certain types of computations very natural and compact. - Appearance of the TurtleScreen and the Turtles at startup/import can be configured by means of a turtle.cfg configuration file. The default configuration mimics the appearance of the old turtle module. - If configured appropriately the module reads in docstrings from a docstring dictionary in some different language, supplied separately and replaces the English ones by those read in. There is a utility function write_docstringdict() to write a dictionary with the original (English) docstrings to disc, so it can serve as a template for translations. Behind the scenes there are some features included with possible extensions in mind. These will be commented and documented elsewhere. """ _ver = "turtle 1.0b1 - for Python 2.6 - 30. 5. 2008, 18:08" #print _ver import Tkinter as TK import types import math import time import os from os.path import isfile, split, join from copy import deepcopy from math import * ## for compatibility with old turtle module _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', 'mode', 'onkey', 'onscreenclick', 'ontimer', 'register_shape', 'resetscreen', 'screensize', 'setup', 'setworldcoordinates', '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', 'fill', 'fillcolor', 'forward', 'get_poly', 'getpen', 'getscreen', 'getturtle', 'goto', 'heading', 'hideturtle', 'home', 'ht', 'isdown', 'isvisible', 'left', 'lt', 'onclick', 'ondrag', 'onrelease', 'pd', 'pen', 'pencolor', 'pendown', 'pensize', 'penup', 'pos', 'position', 'pu', 'radians', 'right', 'reset', 'resizemode', 'rt', 'seth', 'setheading', 'setpos', 'setposition', 'settiltangle', 'setundobuffer', 'setx', 'sety', 'shape', 'shapesize', 'showturtle', 'speed', 'st', 'stamp', 'tilt', 'tiltangle', 'towards', 'tracer', 'turtlesize', 'undo', 'undobufferentries', 'up', 'width', 'window_height', 'window_width', 'write', 'xcor', 'ycor'] _tg_utilities = ['write_docstringdict', 'done', 'mainloop'] _math_functions = ['acos', 'asin', 'atan', 'atan2', 'ceil', 'cos', 'cosh', 'e', 'exp', 'fabs', 'floor', 'fmod', 'frexp', 'hypot', 'ldexp', 'log', 'log10', 'modf', 'pi', 'pow', 'sin', 'sinh', 'sqrt', 'tan', 'tanh'] __all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions + _tg_utilities + _math_functions) _alias_list = ['addshape', 'backward', 'bk', 'fd', 'ht', 'lt', 'pd', 'pos', 'pu', 'rt', 'seth', 'setpos', 'setposition', 'st', 'turtlesize', 'up', 'width'] _CFG = {"width" : 0.5, # Screen "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 } ##print "cwd:", os.getcwd() ##print "__file__:", __file__ ## ##def show(dictionary): ## print "==========================" ## for key in sorted(dictionary.keys()): ## print key, ":", dictionary[key] ## print "==========================" ## print def config_dict(filename): """Convert content of config-file into dictionary.""" f = open(filename, "r") cfglines = f.readlines() f.close() cfgdict = {} for line in cfglines: line = line.strip() if not line or line.startswith("#"): continue try: key, value = line.split("=") except: 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: pass # value need not be converted cfgdict[key] = value return cfgdict def readconfig(cfgdict): """Read config-files, change configuration-dict accordingly. If there is a turtle.cfg file in the current working directory, read it from there. If this contains an importconfig-value, say 'myway', construct filename turtle_mayway.cfg else use turtle.cfg and read it from the import-directory, where turtle.py is located. Update configuration dictionary first according to config-file, in the import directory, then according to config-file in the current working directory. If no config-file is found, the default configuration is used. """ default_cfg = "turtle.cfg" cfgdict1 = {} cfgdict2 = {} if isfile(default_cfg): cfgdict1 = config_dict(default_cfg) #print "1. Loading config-file %s from: %s" % (default_cfg, os.getcwd()) if "importconfig" in cfgdict1: default_cfg = "turtle_%s.cfg" % cfgdict1["importconfig"] try: head, tail = split(__file__) cfg_file2 = join(head, default_cfg) except: cfg_file2 = "" if isfile(cfg_file2): #print "2. Loading config-file %s:" % cfg_file2 cfgdict2 = config_dict(cfg_file2) ## show(_CFG) ## show(cfgdict2) _CFG.update(cfgdict2) ## show(_CFG) ## show(cfgdict1) _CFG.update(cfgdict1) ## show(_CFG) try: readconfig(_CFG) except: print "No configfile read, reason unknown" class Vec2D(tuple): """A 2 dimensional vector class, used as a helper class for implementing turtle graphics. May be useful for turtle graphics programs also. Derived from tuple, so a vector is a tuple! Provides (for a, b vectors, k number): a+b vector addition a-b vector subtraction a*b inner product k*a and a*k multiplication with scalar |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) 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 (self[0]**2 + self[1]**2)**0.5 def rotate(self, angle): """rotate self counterclockwise by angle """ perp = Vec2D(-self[1], self[0]) angle = angle * math.pi / 180.0 c, s = math.cos(angle), math.sin(angle) return Vec2D(self[0]*c+perp[0]*s, self[1]*c+perp[1]*s) def __getnewargs__(self): return (self[0], self[1]) 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 = ()): """Helper functions for Scrolled Canvas, used to forward ScrolledCanvas-methods to Tkinter.Canvas class. """ _dict = {} __methodDict(toClass, _dict) for ex in _dict.keys(): if ex[:1] == '_' or ex[-1:] == '_': del _dict[ex] for ex in exclude: if ex in _dict: del _dict[ex] for ex in __methods(fromClass): if ex in _dict: del _dict[ex] for method, func in _dict.items(): d = {'method': method, 'func': func} if type(toPart) == types.StringType: execString = \ __stringBody % {'method' : method, 'attribute' : toPart} exec execString in d fromClass.__dict__[method] = d[method] 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 and scrollbars according to given canvas size.""" 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(object): """Provide the basic graphics functionality. Interface between Tkinter and turtle.py. To port turtle.py to some different graphics toolkit a corresponding TurtleScreenBase class has to be implemented. """ @staticmethod def _blankimage(): """return a blank image object """ img = TK.PhotoImage(width=1, height=1) img.blank() return img @staticmethod def _image(filename): """return an image object containing the imagedata from a gif-file named filename. """ return TK.PhotoImage(file=filename) 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 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 polygonitem polyitem according to provided arguments: coordlist is sequence of coordinates fill is filling color outline is outline color top is a boolean value, which specifies if polyitem will be put on top of the canvas' displaylist 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 lineitem according to provided arguments: coordlist is sequence of coordinates fill is drawing color width is width of drawn line. top is a boolean value, which specifies if polyitem will be put on top of the canvas' displaylist 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 """ self.cv.update() 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: rgb = 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 in 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) self.cv.update() return item, x1-1 ## def _dot(self, pos, size, color): ## """may be implemented for some other graphics toolkit""" 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: 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 _onkey(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 _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, (x, y), image): """Configure image item as to draw image object at position (x,y) on canvas) """ 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): """returns list of coordinate-pairs of points of item Example (for insiders): >>> from turtle import * >>> 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 = 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 ############################################################################## ### 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): """Some TurtleGraphics Error """ class Shape(object): """Data structure modeling shapes. attribute _type is one of "polygon", "image", "compound" attribute _data is - depending on _type a poygon-tuple, an image or a list constructed 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": if isinstance(data, str): if data.lower().endswith(".gif") and isfile(data): data = TurtleScreen._image(data) # else data assumed to be 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 component to a shape of type compound. Arguments: poly is a polygon, i. e. a tuple of number pairs. fill is the fillcolor of the component, outline is the outline color of the component. call (for a Shapeobject namend s): -- s.addcomponent(((0,0), (10,10), (-10,10)), "red", "blue") 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(object): """Ring buffer used as undobuffer 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 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 setbg etc. Only relies upon the methods of TurtleScreenBase and NOT upon components of the underlying graphics toolkit - which is Tkinter in this case. """ # _STANDARD_DELAY = 5 _RUNNING = True def __init__(self, cv, mode=_CFG["mode"], colormode=_CFG["colormode"], delay=_CFG["delay"]): 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" : ""} TurtleScreenBase.__init__(self, cv) self._mode = mode self._delayvalue = delay self._colormode = _CFG["colormode"] self._keys = [] self.clear() def clear(self): """Delete all drawings and all turtles from the TurtleScreen. Reset empty TurtleScreen to its initial state: white background, no backgroundimage, no eventbindings and tracing on. No argument. Example (for a TurtleScreen instance named screen): >>> screen.clear() Note: this method is not available as function. """ 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) for key in self._keys[:]: self.onkey(None, key) Turtle._pen = None def mode(self, mode=None): """Set turtle-mode ('standard', 'logo' or 'world') and perform reset. Optional argument: mode -- on of the strings 'standard', 'logo' or 'world' Mode 'standard' is compatible with turtle.py. Mode 'logo' is compatible with most Logo-Turtle-Graphics. Mode 'world' uses userdefined 'worldcoordinates'. *Attention*: in this mode angles appear distorted if x/y unit-ratio doesn't equal 1. If mode is not given, return the current mode. Mode Initial turtle heading positive angles ------------|-------------------------|------------------- 'standard' to the right (east) counterclockwise 'logo' upward (north) clockwise Examples: >>> mode('logo') # resets turtle heading to north >>> 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. Arguments: llx -- a number, x-coordinate of lower left corner of canvas lly -- a number, y-coordinate of lower left corner of canvas urx -- a number, x-coordinate of upper right corner of canvas ury -- a number, y-coordinate of upper right corner of canvas Set up user coodinat-system and switch to mode 'world' if necessary. This performs a screen.reset. If mode 'world' is already active, all drawings are redrawn according to the new coordinates. But ATTENTION: in user-defined coordinatesystems angles may appear distorted. (see Screen.mode()) Example (for a TurtleScreen instance named screen): >>> screen.setworldcoordinates(-10,-0.5,50,1.5) >>> for _ in range(36): ... left(10) ... forward(0.5) """ 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): """Adds a turtle shape to TurtleScreen's shapelist. Arguments: (1) name is the name of a gif-file and shape is None. Installs the corresponding image shape. !! Image-shapes DO NOT rotate when turning the turtle, !! so they do not display the heading of the turtle! (2) name is an arbitrary string and shape is a tuple of pairs of coordinates. Installs the corresponding polygon shape (3) name is an arbitrary string and shape is a (compound) Shape object. Installs the corresponding compound shape. To use a shape, you have to issue the command shape(shapename). call: register_shape("turtle.gif") --or: register_shape("tri", ((0,0), (10,10), (-10,10))) Example (for a TurtleScreen instance named screen): >>> screen.register_shape("triangle", ((5,-3),(0,5),(-5,-3))) """ if shape is None: # image if name.lower().endswith(".gif"): shape = Shape("image", self._image(name)) else: raise TurtleGraphicsError("Bad arguments for register_shape.\n" + "Use help(register_shape)" ) elif isinstance(shape, tuple): shape = Shape("polygon", shape) ## else shape assumed to be Shape-instance self._shapes[name] = shape # print "shape added:" , self._shapes def _colorstr(self, color): """Return color string corresponding to args. Argument may be a string or a tuple of three numbers corresponding to actual colormode, i.e. in the range 0<=n<=colormode. If the argument 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: 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. Optional argument: cmode -- one of the values 1.0 or 255 r, g, b values of colortriples have to be in range 0..cmode. Example (for a TurtleScreen instance named screen): >>> screen.colormode() 1.0 >>> screen.colormode(255) >>> 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. No argument. Example (for a TurtleScreen instance named screen): >>> screen.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): >>> screen.turtles() [<turtle.Turtle object at 0x00E11FB0>] """ return self._turtles def bgcolor(self, *args): """Set or return backgroundcolor of the TurtleScreen. Arguments (if given): a color string or three numbers in the range 0..colormode or a 3-tuple of such numbers. Example (for a TurtleScreen instance named screen): >>> screen.bgcolor("orange") >>> screen.bgcolor() 'orange' >>> screen.bgcolor(0.5,0,0.5) >>> screen.bgcolor() '#800080' """ 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): """Turns turtle animation on/off and set delay for update drawings. Optional arguments: n -- nonnegative integer delay -- nonnegative integer If n is given, only each n-th regular screen update is really performed. (Can be used to accelerate the drawing of complex graphics.) Second arguments sets delay value (see RawTurtle.delay()) 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. Optional argument: delay -- positive integer Example (for a TurtleScreen instance named screen): >>> screen.delay(15) >>> screen.delay() 15 """ if delay is None: return self._delayvalue self._delayvalue = int(delay) def _incrementudc(self): """Increment upadate counter.""" if not TurtleScreen._RUNNING: TurtleScreen._RUNNNING = 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. No argument. Example (for a Screen instance named screen): >>> cv = screen.getcanvas() >>> cv <turtle.ScrolledCanvas instance at 0x010742D8> """ return self.cv def getshapes(self): """Return a list of names of all currently available turtle shapes. No argument. 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 event on canvas. Arguments: fun -- a function with two arguments, the coordinates of the clicked point on the canvas. num -- the number of the mouse-button, defaults to 1 Example (for a TurtleScreen instance named screen and a Turtle instance named turtle): >>> screen.onclick(goto) >>> # Subsequently clicking into the TurtleScreen will >>> # make the turtle move to the clicked point. >>> screen.onclick(None) """ 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._onkey(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 a gif-file 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) onscreenclick = onclick resetscreen = reset clearscreen = clear addshape = register_shape class TNavigator(object): """Navigation part of the 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 turtle to its initial values Will be overwritten by parent class """ self._position = Vec2D(0.0, 0.0) self._orient = TNavigator.START_ORIENTATION[self._mode] def _setmode(self, mode=None): """Set turtle-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 angle measurement units to degrees. Optional argument: fullcircle - a number Set angle measurement units, i. e. set number of 'degrees' for a full circle. Dafault value is 360 degrees. Example (for a Turtle instance named turtle): >>> turtle.left(90) >>> turtle.heading() 90 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 """ self._setDegreesPerAU(fullcircle) def radians(self): """ Set the angle measurement units to radians. No arguments. Example (for a Turtle instance named turtle): >>> turtle.heading() 90 >>> turtle.radians() >>> turtle.heading() 1.5707963267948966 """ self._setDegreesPerAU(2*math.pi) def _go(self, distance): """move turtle forward by specified distance""" ende = self._position + self._orient * distance self._goto(ende) def _rotate(self, angle): """Turn turtle counterclockwise by specified angle if angle > 0.""" angle *= self._degreesPerAU self._orient = self._orient.rotate(angle) def _goto(self, end): """move turtle to position end.""" self._position = end def forward(self, distance): """Move the turtle forward by the specified distance. Aliases: forward | fd Argument: distance -- a number (integer or float) Move the turtle forward by the specified distance, in the direction the turtle is headed. 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 Argument: distance -- a number Move the turtle backward by distance ,opposite to the direction the turtle is headed. Do not change the turtle's heading. 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 turtle right by angle units. Aliases: right | rt Argument: angle -- a number (integer or float) Turn turtle right by angle units. (Units are by default degrees, but can be set via the degrees() and radians() functions.) Angle orientation depends on mode. (See this.) 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 turtle left by angle units. Aliases: left | lt Argument: angle -- a number (integer or float) Turn turtle left by angle units. (Units are by default degrees, but can be set via the degrees() and radians() functions.) Angle orientation depends on mode. (See this.) 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 No arguments. 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. No arguments. Example (for a Turtle instance named turtle): >>> reset() >>> turtle.left(60) >>> turtle.forward(100) >>> print turtle.xcor() 50.0 """ return self._position[0] def ycor(self): """ Return the turtle's y coordinate --- No arguments. Example (for a Turtle instance named turtle): >>> reset() >>> turtle.left(60) >>> turtle.forward(100) >>> print turtle.ycor() 86.6025403784 """ return self._position[1] def goto(self, x, y=None): """Move turtle to an absolute position. Aliases: setpos | setposition | goto: Arguments: x -- a number or a pair/vector of numbers y -- a number None call: goto(x, y) # two coordinates --or: goto((x, y)) # a pair (tuple) of coordinates --or: goto(vec) # e.g. as returned by pos() Move turtle to an absolute position. If the pen is down, a line will be drawn. The turtle's orientation does not change. Example (for a Turtle instance named turtle): >>> tp = turtle.pos() >>> tp (0.00, 0.00) >>> turtle.setpos(60,30) >>> turtle.pos() (60.00,30.00) >>> turtle.setpos((20,80)) >>> turtle.pos() (20.00,80.00) >>> turtle.setpos(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 turtle to the origin - coordinates (0,0). No arguments. Move turtle to the origin - coordinates (0,0) and set its heading to its start-orientation (which depends on mode). Example (for a Turtle instance named turtle): >>> turtle.home() """ self.goto(0, 0) self.setheading(0) def setx(self, x): """Set the turtle's first coordinate to x Argument: x -- a number (integer or float) Set the turtle's first coordinate to x, leave second coordinate unchanged. 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 second coordinate to y Argument: y -- a number (integer or float) Set the turtle's first coordinate to x, second coordinate remains unchanged. 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. Arguments: x -- a number or a pair/vector of numbers or a turtle instance y -- a number None None call: distance(x, y) # two coordinates --or: distance((x, y)) # a pair (tuple) of coordinates --or: distance(vec) # e.g. as returned by pos() --or: distance(mypen) # where mypen is another turtle Example (for a Turtle instance named turtle): >>> turtle.pos() (0.00, 0.00) >>> turtle.distance(30,40) 50.0 >>> pen = Turtle() >>> pen.forward(77) >>> turtle.distance(pen) 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). Arguments: x -- a number or a pair/vector of numbers or a turtle instance y -- a number None None call: distance(x, y) # two coordinates --or: distance((x, y)) # a pair (tuple) of coordinates --or: distance(vec) # e.g. as returned by pos() --or: distance(mypen) # where mypen is another turtle Return the angle, between the line from turtle-position to position specified by x, y and the turtle's start orientation. (Depends on modes - "standard" or "logo") Example (for a Turtle instance named turtle): >>> turtle.pos() (10.00, 10.00) >>> 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.atan2(y, x)*180.0/math.pi, 10) % 360.0 result /= self._degreesPerAU return (self._angleOffset + self._angleOrient*result) % self._fullcircle def heading(self): """ Return the turtle's current heading. No arguments. Example (for a Turtle instance named turtle): >>> turtle.left(67) >>> turtle.heading() 67.0 """ x, y = self._orient result = round(math.atan2(y, x)*180.0/math.pi, 10) % 360.0 result /= self._degreesPerAU return (self._angleOffset + self._angleOrient*result) % self._fullcircle def setheading(self, to_angle): """Set the orientation of the turtle to to_angle. Aliases: setheading | seth Argument: to_angle -- a number (integer or float) Set the orientation of the turtle to to_angle. 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 Example (for a Turtle instance named turtle): >>> turtle.setheading(90) >>> turtle.heading() 90 """ 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 given radius. Arguments: radius -- a number extent (optional) -- a number steps (optional) -- an integer Draw a circle with 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 counterclockwise direction if radius is positive, otherwise in clockwise direction. Finally the direction of the turtle is changed by the amount of 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. Maybe used to draw regular polygons. call: circle(radius) # full circle --or: circle(radius, extent) # arc --or: circle(radius, extent, steps) --or: circle(radius, steps=6) # 6-sided polygon Example (for a Turtle instance named turtle): >>> turtle.circle(50) >>> turtle.circle(120, 180) # semicircle """ if self.undobuffer: self.undobuffer.push(["seq"]) self.undobuffer.cumulate = True 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(w2*math.pi/180.0*self._degreesPerAU) if radius < 0: l, w, w2 = -l, -w, -w2 tr = self.tracer() dl = self._delay() 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) if self.undobuffer: self.undobuffer.cumulate = False ## three dummy methods to be implemented by child class: def speed(self, s=0): """dummy method - to be overwritten by child class""" def tracer(self, a=None, b=None): """dummy method - to be overwritten by child class""" def _delay(self, n=None): """dummy method - to be overwritten by child class""" fd = forward bk = back backward = back rt = right lt = left position = pos setpos = goto setposition = goto seth = setheading class TPen(object): """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._tilt = 0 self._outlinewidth = 1 ### self.screen = None # to override by child class def resizemode(self, rmode=None): """Set resizemode to one of the values: "auto", "user", "noresize". (Optional) Argument: rmode -- one of the strings "auto", "user", "noresize" Different resizemodes have the following effects: - "auto" adapts the appearance of the turtle corresponding to the value of pensize. - "user" adapts the appearance of the turtle according to the values of stretchfactor and outlinewidth (outline), which are set by shapesize() - "noresize" no adaption of the turtle's appearance takes place. If no argument is given, return current resizemode. resizemode("user") is called by a call of shapesize with arguments. Examples (for a Turtle instance named turtle): >>> turtle.resizemode("noresize") >>> turtle.resizemode() 'noresize' """ 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): """Set or return the line thickness. Aliases: pensize | width Argument: width -- positive number Set the line thickness to width or return it. If resizemode is set to "auto" and turtleshape is a polygon, that polygon is drawn with the same line thickness. If no argument is given, current pensize is returned. 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): """Pull the pen up -- no drawing when moving. Aliases: penup | pu | up No argument Example (for a Turtle instance named turtle): >>> turtle.penup() """ if not self._drawing: return self.pen(pendown=False) def pendown(self): """Pull the pen down -- drawing when moving. Aliases: pendown | pd | down No argument. Example (for a Turtle instance named turtle): >>> turtle.pendown() """ if self._drawing: return self.pen(pendown=True) def isdown(self): """Return True if pen is down, False if it's up. No argument. 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. Optional argument: speed -- an integer in the range 0..10 or a speedstring (see below) Set the turtle's speed to an integer value in the range 0 .. 10. If no argument is given: return current speed. If input is a number greater than 10 or smaller than 0.5, speed is set to 0. Speedstrings are mapped to speedvalues in the following way: 'fastest' : 0 'fast' : 10 'normal' : 6 'slow' : 3 'slowest' : 1 speeds from 1 to 10 enforce increasingly faster animation of line drawing and turtle turning. Attention: speed = 0 : *no* animation takes place. forward/back makes turtle jump and likewise left/right make the turtle turn instantly. Example (for a Turtle instance named turtle): >>> turtle.speed(3) """ speeds = {'fastest':0, 'fast':10, 'normal':6, 'slow':3, 'slowest':1 } if speed is None: return self._speed if speed in speeds: speed = speeds[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. Arguments: Several input formats are allowed. They use 0, 1, 2, or 3 arguments as follows: color() Return the current pencolor and the current fillcolor as a pair of color specification strings as are returned by pencolor and fillcolor. color(colorstring), color((r,g,b)), color(r,g,b) inputs as in pencolor, set both, fillcolor and pencolor, 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 turtleshape is a polygon, outline and interior of that polygon is drawn with the newly set colors. For mor info see: pencolor, fillcolor Example (for a Turtle instance named turtle): >>> turtle.color('red', 'green') >>> turtle.color() ('red', 'green') >>> colormode(255) >>> color((40, 80, 120), (160, 200, 240)) >>> color() ('#285078', '#a0c8f0') """ 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. Arguments: Four input formats are allowed: - pencolor() Return the current pencolor as color specification string, possibly in hex-number format (see example). May be used as input to another color/pencolor/fillcolor call. - pencolor(colorstring) s is a Tk color specification string, such as "red" or "yellow" - pencolor((r, g, b)) *a tuple* of r, g, and b, which represent, an RGB color, and each of r, g, and b are in the range 0..colormode, where colormode is either 1.0 or 255 - pencolor(r, g, b) r, g, and b represent an RGB color, and each of r, g, and b are in the range 0..colormode If turtleshape 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') >>> tup = (0.2, 0.8, 0.55) >>> turtle.pencolor(tup) >>> turtle.pencolor() '#33cc8c' """ 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. Arguments: Four input formats are allowed: - fillcolor() Return the current fillcolor as color specification string, possibly in hex-number format (see example). May be used as input to another color/pencolor/fillcolor call. - fillcolor(colorstring) s is a Tk color specification string, such as "red" or "yellow" - fillcolor((r, g, b)) *a tuple* of r, g, and b, which represent, an RGB color, and each of r, g, and b are in the range 0..colormode, where colormode is either 1.0 or 255 - fillcolor(r, g, b) r, g, and b represent an RGB color, and each of r, g, and b are in the range 0..colormode If turtleshape 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') >>> col = turtle.pencolor() >>> turtle.fillcolor(col) >>> turtle.fillcolor(0, .5, 0) """ if args: color = self._colorstr(args) if color == self._fillcolor: return self.pen(fillcolor=color) else: return self._color(self._fillcolor) def showturtle(self): """Makes the turtle visible. Aliases: showturtle | st No argument. Example (for a Turtle instance named turtle): >>> turtle.hideturtle() >>> turtle.showturtle() """ self.pen(shown=True) def hideturtle(self): """Makes the turtle invisible. Aliases: hideturtle | ht No argument. It's a good idea to do this while you're in the middle of a complicated drawing, because hiding the turtle speeds up the drawing observably. Example (for a Turtle instance named turtle): >>> turtle.hideturtle() """ self.pen(shown=False) def isvisible(self): """Return True if the Turtle is shown, False if it's hidden. No argument. Example (for a Turtle instance named turtle): >>> turtle.hideturtle() >>> print turtle.isvisible(): False """ 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) "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} >>> 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} >>> 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} """ _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, "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 "outline" in p: self._outlinewidth = p["outline"] if "shown" in p: self._shown = p["shown"] if "tilt" in p: self._tilt = p["tilt"] self._update() ## three dummy methods to be implemented by child class: def _newLine(self, usePos = True): """dummy method - to be overwritten by child class""" def _update(self, count=True, forced=False): """dummy method - to be overwritten by child class""" def _color(self, args): """dummy method - to be overwritten by child class""" def _colorstr(self, args): """dummy method - to be overwritten by child class""" width = pensize up = penup pu = penup pd = pendown down = pendown st = showturtle ht = hideturtle class _TurtleImage(object): """Helper class: Datatype to store Turtle attributes """ def __init__(self, screen, shapeIndex): self.screen = screen self._type = None self._setshape(shapeIndex) def _setshape(self, shapeIndex): screen = self.screen # RawTurtle.screens[self.screenIndex] 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): """Animation part of the RawTurtle. Puts RawTurtle upon a TurtleScreen and provides tools for its animation. """ 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 cavas 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 restore its default values. No argument. , Delete the turtle's drawings from the screen, re-center the turtle and set variables to the default values. Example (for a Turtle instance named turtle): >>> 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 undobuffer. Argument: size -- an integer or None If size is an integer an empty undobuffer of given size is installed. Size gives the maximum number of turtle-actions that can be undone by the undo() function. If size is None, no undobuffer is present. Example (for a Turtle instance named turtle): >>> turtle.setundobuffer(42) """ if size is None: self.undobuffer = None else: self.undobuffer = Tbuffer(size) def undobufferentries(self): """Return count of entries in the undobuffer. No argument. 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 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. Do not move turtle. No arguments. Delete the turtle's drawings from the screen. Do not move turtle. State and position of the turtle as well as drawings of other turtles are not affected. Examples (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): """Turns turtle animation on/off and set delay for update drawings. Optional arguments: n -- nonnegative integer delay -- nonnegative integer If n is given, only each n-th regular screen update is really performed. (Can be used to accelerate the drawing of complex graphics.) Second arguments sets delay value (see RawTurtle.delay()) Example (for a Turtle instance named turtle): >>> turtle.tracer(8, 25) >>> dist = 2 >>> for i in range(200): ... turtle.fd(dist) ... turtle.rt(90) ... dist += 2 """ 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: 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 clone(self): """Create and return a clone of the turtle. No argument. Create and return a clone of the turtle with same position, heading and turtle properties. Example (for a Turtle instance named mick): mick = Turtle() joe = mick.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 turtle shape to shape with given name / return current shapename. Optional argument: name -- a string, which is a valid shapename Set turtle shape to shape with given name or, if name is not given, return name of current shape. Shape with name must exist in the TurtleScreen's shape dictionary. Initially there are the following polygon shapes: 'arrow', 'turtle', 'circle', 'square', 'triangle', 'classic'. To learn about how to deal with shapes see Screen-method register_shape. Example (for a Turtle instance named turtle): >>> turtle.shape() 'arrow' >>> 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): """Set/return turtle's stretchfactors/outline. Set resizemode to "user". Optinonal arguments: stretch_wid : positive number stretch_len : positive number outline : positive number Return or set the pen's attributes x/y-stretchfactors and/or outline. Set resizemode to "user". If and only if resizemode is set to "user", the turtle will be displayed stretched according to its stretchfactors: stretch_wid is stretchfactor perpendicular to orientation stretch_len is stretchfactor in direction of turtles orientation. outline determines the width of the shapes's outline. Examples (for a Turtle instance named turtle): >>> turtle.resizemode("user") >>> turtle.shapesize(5, 5, 12) >>> turtle.shapesize(outline=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 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 settiltangle(self, angle): """Rotate the turtleshape to point in the specified direction 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). Examples (for a Turtle instance named turtle): >>> turtle.shape("circle") >>> turtle.shapesize(5,2) >>> turtle.settiltangle(45) >>> stamp() >>> turtle.fd(50) >>> turtle.settiltangle(-45) >>> stamp() >>> turtle.fd(50) """ tilt = -angle * self._degreesPerAU * self._angleOrient tilt = (tilt * math.pi / 180.0) % (2*math.pi) self.pen(resizemode="user", tilt=tilt) def tiltangle(self): """Return the current tilt-angle. No argument. 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.tilt(45) >>> turtle.tiltangle() """ tilt = -self._tilt * (180.0/math.pi) * self._angleOrient return (tilt / self._degreesPerAU) % self._fullcircle 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.settiltangle(angle + self.tiltangle()) 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 _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 shape = tshape else: if self._resizemode == "auto": lx = ly = max(1, self._pensize/5.0) w = self._pensize tiltangle = 0 elif self._resizemode == "user": lx, ly = self._stretchfactor w = self._outlinewidth tiltangle = self._tilt shape = [(lx*x, ly*y) for (x, y) in tshape] t0, t1 = math.sin(tiltangle), math.cos(tiltangle) shape = [(t1*x+t0*y, -t0*x+t1*y) for (x, y) in shape] shape = self._polytrafo(shape) 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": lx, ly = self._stretchfactor w = self._outlinewidth for item, (poly, fc, oc) in zip(titem, tshape): poly = [(lx*x, ly*y) for (x, y) in poly] poly = self._polytrafo(poly) screen._drawpoly(item, poly, fill=self._cc(fc), outline=self._cc(oc), width=w, 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 shape = tshape else: if self._resizemode == "auto": lx = ly = max(1, self._pensize/5.0) w = self._pensize tiltangle = 0 elif self._resizemode == "user": lx, ly = self._stretchfactor w = self._outlinewidth tiltangle = self._tilt shape = [(lx*x, ly*y) for (x, y) in tshape] t0, t1 = math.sin(tiltangle), math.cos(tiltangle) shape = [(t1*x+t0*y, -t0*x+t1*y) for (x, y) in shape] shape = self._polytrafo(shape) 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) lx, ly = self._stretchfactor w = self._outlinewidth for item, (poly, fc, oc) in zip(stitem, tshape): poly = [(lx*x, ly*y) for (x, y) in poly] poly = self._polytrafo(poly) screen._drawpoly(item, poly, fill=self._cc(fc), outline=self._cc(oc), width=w, top=True) self.stampItems.append(stitem) 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. item = ("stamp", stampid) buf = self.undobuffer if item not in buf.buffer: return index = buf.buffer.index(item) buf.buffer.remove(item) if index <= buf.ptr: buf.ptr = (buf.ptr - 1) % buf.bufsize buf.buffer.insert((buf.ptr+1)%buf.bufsize, [None]) 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 methodes for turtle movement depend on this one. """ ## Version mit 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 current line item and starts a new one. Remark: if current line became too long, animation performance (via _drawline) slowed 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 fill(self, flag=None): """Call fill(True) before drawing a shape to fill, fill(False) when done. Optional argument: flag -- True/False (or 1/0 respectively) Call fill(True) before drawing the shape you want to fill, and fill(False) when done. When used without argument: return fillstate (True if filling, False else) Example (for a Turtle instance named turtle): >>> turtle.fill(True) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.fill(False) """ filling = isinstance(self._fillpath, list) if flag is None: return filling screen = self.screen entry1 = entry2 = () if filling: if len(self._fillpath) > 2: self.screen._drawpoly(self._fillitem, self._fillpath, fill=self._fillcolor) entry1 = ("dofill", self._fillitem) if flag: self._fillitem = self.screen._createpoly() self.items.append(self._fillitem) self._fillpath = [self._position] entry2 = ("beginfill", self._fillitem) # , self._fillpath) self._newLine() else: self._fillitem = self._fillpath = None if self.undobuffer: if entry1 == (): if entry2 != (): self.undobuffer.push(entry2) else: if entry2 == (): self.undobuffer.push(entry1) else: self.undobuffer.push(["seq", entry1, entry2]) self._update() def begin_fill(self): """Called just before drawing a shape to be filled. No argument. Example (for a Turtle instance named turtle): >>> turtle.begin_fill() >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.end_fill() """ self.fill(True) def end_fill(self): """Fill the shape drawn after the call begin_fill(). No argument. Example (for a Turtle instance named turtle): >>> turtle.begin_fill() >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.end_fill() """ self.fill(False) def dot(self, size=None, *color): """Draw a dot with diameter size, using color. Optional arguments: size -- an integer >= 1 (if given) color -- a colorstring or a numeric color tuple Draw a circular dot with diameter size, using color. If size is not given, the maximum of pensize+4 and 2*pensize is used. Example (for a Turtle instance named turtle): >>> turtle.dot() >>> turtle.fd(50); turtle.dot(20, "blue"); turtle.fd(50) """ #print "dot-1:", size, color 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) #print "dot-2:", size, color if hasattr(self.screen, "_dot"): item = self.screen._dot(self._position, size, color) #print "dot:", size, color, "item:", item self.items.append(item) if self.undobuffer: self.undobuffer.push(("dot", item)) else: pen = self.pen() if self.undobuffer: self.undobuffer.push(["seq"]) self.undobuffer.cumulate = True try: if self.resizemode() == 'auto': self.ht() self.pendown() self.pensize(size) self.pencolor(color) self.forward(0) finally: self.pen(pen) if self.undobuffer: self.undobuffer.cumulate = False def _write(self, txt, align, font): """Performs the writing for write() """ item, end = self.screen._write(self._position, txt, align, font, self._pencolor) 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) """ if self.undobuffer: self.undobuffer.push(["seq"]) self.undobuffer.cumulate = True end = self._write(str(arg), align.lower(), font) if move: x, y = self.pos() self.setpos(end, y) if self.undobuffer: self.undobuffer.cumulate = False def begin_poly(self): """Start recording the vertices of a polygon. No argument. Start recording the vertices of a polygon. Current turtle position is first point of polygon. Example (for a Turtle instance named turtle): >>> turtle.begin_poly() """ self._poly = [self._position] self._creatingPoly = True def end_poly(self): """Stop recording the vertices of a polygon. No argument. Stop recording the vertices of a polygon. Current turtle position is last point of polygon. This will be connected with the first point. Example (for a Turtle instance named turtle): >>> turtle.end_poly() """ self._creatingPoly = False def get_poly(self): """Return the lastly recorded polygon. No argument. Example (for a Turtle instance named turtle): >>> p = turtle.get_poly() >>> turtle.register_shape("myFavouriteShape", p) """ ## check if there is any poly? -- 1st solution: if self._poly is not None: return tuple(self._poly) def getscreen(self): """Return the TurtleScreen object, the turtle is drawing on. No argument. 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 0x0106B770> >>> ts.bgcolor("pink") """ return self.screen def getturtle(self): """Return the Turtleobject itself. No argument. Only reasonable use: as a function to return the 'anonymous turtle': Example: >>> pet = getturtle() >>> pet.fd(50) >>> pet <turtle.Turtle object at 0x0187D810> >>> turtles() [<turtle.Turtle object at 0x0187D810>] """ return self getpen = getturtle ################################################################ ### screen oriented methods recurring to methods of TurtleScreen ################################################################ def window_width(self): """ Returns the width of the turtle window. No argument. Example (for a TurtleScreen instance named screen): >>> screen.window_width() 640 """ return self.screen._window_size()[0] def window_height(self): """ Return the height of the turtle window. No argument. Example (for a TurtleScreen instance named screen): >>> screen.window_height() 480 """ return self.screen._window_size()[1] def _delay(self, delay=None): """Set delay value which determines speed of turtle animation. """ return self.screen.delay(delay) ##### event binding methods ##### def onclick(self, fun, btn=1, add=None): """Bind fun to mouse-click 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. num -- number of the mouse-button defaults to 1 (left mouse button). add -- True or False. If True, new binding will be added, otherwise it will replace a former binding. Example for the anonymous turtle, i. e. the procedural way: >>> def turn(x, y): ... left(360) ... >>> 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. num -- 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. num -- 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) dummy = self.undobuffer.pop() elif action == "stamp": stitem = data[0] self.clearstamp(stitem) elif action == "go": self._undogoto(data) 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 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 singleton screen object. If none exists at the moment, create a new one and return it, else 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): # XXX there is no need for this code to be conditional, # as there will be only a single _Screen instance, anyway # XXX actually, the turtle demo is injecting root window, # so perhaps the conditional creation of a root should be # preserved (perhaps by passing it as an optional parameter) 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 title of turtle-window Argument: titlestring -- a string, to appear in the titlebar of the turtle graphics window. This is a method of Screen-class. Not available for TurtleScreen- objects. 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 = True root.destroy() def bye(self): """Shut the turtlegraphics window. Example (for a TurtleScreen instance named screen): >>> screen.bye() """ 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 _getpen(): """Create the 'anonymous' turtle if not already present.""" if Turtle._pen is None: Turtle._pen = Turtle() return Turtle._pen def _getscreen(): """Create a TurtleScreen if not already present.""" if Turtle._screen is None: Turtle._screen = Screen() return Turtle._screen 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 <filname>.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__ f = open("%s.py" % filename,"w") keys = sorted([x for x in docsdict.keys() 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 lang-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. """ modname = "turtle_docstringdict_%(language)s" % {'language':lang.lower()} module = __import__(modname) docsdict = module.docsdict for key in docsdict: #print key try: eval(key).im_func.__doc__ = docsdict[key] except: print "Bad docstring-entry: %s" % key _LANGUAGE = _CFG["language"] try: if _LANGUAGE != "english": read_docstrings(_LANGUAGE) except ImportError: print "Cannot find docsdict for", _LANGUAGE except: print ("Unknown Error when trying to import %s-docstring-dictionary" % _LANGUAGE) def getmethparlist(ob): "Get strings describing the arguments for the given object" argText1 = argText2 = "" # bit of a hack for methods - turn it into a function # but we drop the "self" param. if type(ob)==types.MethodType: fob = ob.im_func argOffset = 1 else: fob = ob argOffset = 0 # Try and build one for Python defined functions if type(fob) in [types.FunctionType, types.LambdaType]: try: counter = fob.func_code.co_argcount items2 = list(fob.func_code.co_varnames[argOffset:counter]) realArgs = fob.func_code.co_varnames[argOffset:counter] defaults = fob.func_defaults or [] defaults = list(map(lambda name: "=%s" % repr(name), defaults)) defaults = [""] * (len(realArgs)-len(defaults)) + defaults items1 = map(lambda arg, dflt: arg+dflt, realArgs, defaults) if fob.func_code.co_flags & 0x4: items1.append("*"+fob.func_code.co_varnames[counter]) items2.append("*"+fob.func_code.co_varnames[counter]) counter += 1 if fob.func_code.co_flags & 0x8: items1.append("**"+fob.func_code.co_varnames[counter]) items2.append("**"+fob.func_code.co_varnames[counter]) argText1 = ", ".join(items1) argText1 = "(%s)" % argText1 argText2 = ", ".join(items2) argText2 = "(%s)" % argText2 except: pass return argText1, argText2 def _turtle_docrevise(docstr): """To reduce docstrings from 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 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. for methodname in _tg_screen_functions: pl1, pl2 = getmethparlist(eval('_Screen.' + methodname)) if pl1 == "": print ">>>>>>", pl1, pl2 continue defstr = ("def %(key)s%(pl1)s: return _getscreen().%(key)s%(pl2)s" % {'key':methodname, 'pl1':pl1, 'pl2':pl2}) exec defstr eval(methodname).__doc__ = _screen_docrevise(eval('_Screen.'+methodname).__doc__) for methodname in _tg_turtle_functions: pl1, pl2 = getmethparlist(eval('Turtle.' + methodname)) if pl1 == "": print ">>>>>>", pl1, pl2 continue defstr = ("def %(key)s%(pl1)s: return _getpen().%(key)s%(pl2)s" % {'key':methodname, 'pl1':pl1, 'pl2':pl2}) exec defstr eval(methodname).__doc__ = _turtle_docrevise(eval('Turtle.'+methodname).__doc__) done = mainloop = TK.mainloop del pl1, pl2, defstr 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: fill(1) for _ in range(4): forward(20) left(90) if i == 2: color("maroon") fill(0) 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) fill(1) for i in range(5): forward(20) left(90) forward(20) right(90) fill(0) # 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) laenge += 10 lt(15) speed((speed()+1)%12) end_fill() lt(120) pu() fd(70) rt(30) pd() color("red","yellow") speed(0) fill(1) for _ in range(4): circle(50, 90) rt(90) fd(30) rt(90) fill(0) 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()