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-\section{\module{turtle} ---
-         Turtle graphics for Tk}
-
-\declaremodule{standard}{turtle}
-   \platform{Tk}
-\moduleauthor{Guido van Rossum}{guido@python.org}
-\modulesynopsis{An environment for turtle graphics.}
-
-\sectionauthor{Moshe Zadka}{moshez@zadka.site.co.il}
-
-
-The \module{turtle} module provides turtle graphics primitives, in both an
-object-oriented and procedure-oriented ways. Because it uses \module{Tkinter}
-for the underlying graphics, it needs a version of python installed with
-Tk support.
-
-The procedural interface uses a pen and a canvas which are automagically
-created when any of the functions are called.
-
-The \module{turtle} module defines the following functions:
-
-\begin{funcdesc}{degrees}{}
-Set angle measurement units to degrees.
-\end{funcdesc}
-
-\begin{funcdesc}{radians}{}
-Set angle measurement units to radians.
-\end{funcdesc}
-
-\begin{funcdesc}{setup}{**kwargs}
-Sets the size and position of the main window.  Keywords are:
-\begin{itemize}
-  \item \code{width}: either a size in pixels or a fraction of the screen.
-   The default is 50\% of the screen.
-  \item \code{height}: either a size in pixels or a fraction of the screen.
-   The default is 50\% of the screen.
-  \item \code{startx}: starting position in pixels from the left edge
-      of the screen. \code{None} is the default value and 
-      centers the window horizontally on screen.
-  \item \code{starty}: starting position in pixels from the top edge
-      of the screen. \code{None} is the default value and 
-      centers the window vertically on screen.
-\end{itemize}
-
-   Examples:
-
-\begin{verbatim}
-# Uses default geometry: 50% x 50% of screen, centered.
-setup()  
-
-# Sets window to 200x200 pixels, in upper left of screen
-setup (width=200, height=200, startx=0, starty=0)
-
-# Sets window to 75% of screen by 50% of screen, and centers it.
-setup(width=.75, height=0.5, startx=None, starty=None)
-\end{verbatim}
-
-\end{funcdesc}
-
-\begin{funcdesc}{title}{title_str}
-Set the window's title to \var{title}.
-\end{funcdesc}
-
-\begin{funcdesc}{done}{}
-Enters the Tk main loop.  The window will continue to 
-be displayed until the user closes it or the process is killed.
-\end{funcdesc}
-
-\begin{funcdesc}{reset}{}
-Clear the screen, re-center the pen, and set variables to the default
-values.
-\end{funcdesc}
-
-\begin{funcdesc}{clear}{}
-Clear the screen.
-\end{funcdesc}
-
-\begin{funcdesc}{tracer}{flag}
-Set tracing on/off (according to whether flag is true or not). Tracing
-means line are drawn more slowly, with an animation of an arrow along the 
-line.
-\end{funcdesc}
-
-\begin{funcdesc}{speed}{speed}
-Set the speed of the turtle. Valid values for the parameter
-\var{speed} are \code{'fastest'} (no delay), \code{'fast'},
-(delay 5ms), \code{'normal'} (delay 10ms), \code{'slow'}
-(delay 15ms), and \code{'slowest'} (delay 20ms).
-\versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{delay}{delay}
-Set the speed of the turtle to \var{delay}, which is given
-in ms. \versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{forward}{distance}
-Go forward \var{distance} steps.
-\end{funcdesc}
-
-\begin{funcdesc}{backward}{distance}
-Go backward \var{distance} steps.
-\end{funcdesc}
-
-\begin{funcdesc}{left}{angle}
-Turn left \var{angle} units. Units are by default degrees, but can be
-set via the \function{degrees()} and \function{radians()} functions.
-\end{funcdesc}
-
-\begin{funcdesc}{right}{angle}
-Turn right \var{angle} units. Units are by default degrees, but can be
-set via the \function{degrees()} and \function{radians()} functions.
-\end{funcdesc}
-
-\begin{funcdesc}{up}{}
-Move the pen up --- stop drawing.
-\end{funcdesc}
-
-\begin{funcdesc}{down}{}
-Move the pen down --- draw when moving.
-\end{funcdesc}
-
-\begin{funcdesc}{width}{width}
-Set the line width to \var{width}.
-\end{funcdesc}
-
-\begin{funcdesc}{color}{s}
-\funclineni{color}{(r, g, b)}
-\funclineni{color}{r, g, b}
-Set the pen color.  In the first form, the color is specified as a
-Tk color specification as a string.  The second form specifies the
-color as a tuple of the RGB values, each in the range [0..1].  For the
-third form, the color is specified giving the RGB values as three
-separate parameters (each in the range [0..1]).
-\end{funcdesc}
-
-\begin{funcdesc}{write}{text\optional{, move}}
-Write \var{text} at the current pen position. If \var{move} is true,
-the pen is moved to the bottom-right corner of the text. By default,
-\var{move} is false.
-\end{funcdesc}
-
-\begin{funcdesc}{fill}{flag}
-The complete specifications are rather complex, but the recommended 
-usage is: call \code{fill(1)} before drawing a path you want to fill,
-and call \code{fill(0)} when you finish to draw the path.
-\end{funcdesc}
-
-\begin{funcdesc}{begin\_fill}{}
-Switch turtle into filling mode; 
-Must eventually be followed by a corresponding end_fill() call.
-Otherwise it will be ignored.
-\versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{end\_fill}{}
-End filling mode, and fill the shape; equivalent to \code{fill(0)}.
-\versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{circle}{radius\optional{, extent}}
-Draw a circle with radius \var{radius} whose center-point is
-\var{radius} units left of the turtle.
-\var{extent} determines which part of a circle is drawn: if
-not given it defaults to a full circle.
-
-If \var{extent} is not a full circle, one endpoint of the arc is the
-current pen position. The arc is drawn in a counter clockwise
-direction if \var{radius} is positive, otherwise in a clockwise
-direction.  In the process, the direction of the turtle is changed
-by the amount of the \var{extent}.
-\end{funcdesc}
-
-\begin{funcdesc}{goto}{x, y}
-\funclineni{goto}{(x, y)}
-Go to co-ordinates \var{x}, \var{y}.  The co-ordinates may be
-specified either as two separate arguments or as a 2-tuple.
-\end{funcdesc}
-
-\begin{funcdesc}{towards}{x, y}
-Return the angle of the line from the turtle's position
-to the point \var{x}, \var{y}. The co-ordinates may be
-specified either as two separate arguments, as a 2-tuple,
-or as another pen object.
-\versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{heading}{}
-Return the current orientation of the turtle.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{setheading}{angle}
-Set the orientation of the turtle to \var{angle}.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{position}{}
-Return the current location of the turtle as an \code{(x,y)} pair.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{setx}{x}
-Set the x coordinate of the turtle to \var{x}.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{sety}{y}
-Set the y coordinate of the turtle to \var{y}.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{window\_width}{}
-Return the width of the canvas window.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{window\_height}{}
-Return the height of the canvas window.
-\versionadded{2.3}
-\end{funcdesc}
-
-This module also does \code{from math import *}, so see the
-documentation for the \refmodule{math} module for additional constants
-and functions useful for turtle graphics.
-
-\begin{funcdesc}{demo}{}
-Exercise the module a bit.
-\end{funcdesc}
-
-\begin{excdesc}{Error}
-Exception raised on any error caught by this module.
-\end{excdesc}
-
-For examples, see the code of the \function{demo()} function.
-
-This module defines the following classes:
-
-\begin{classdesc}{Pen}{}
-Define a pen. All above functions can be called as a methods on the given
-pen. The constructor automatically creates a canvas do be drawn on.
-\end{classdesc}
-
-\begin{classdesc}{Turtle}{}
-Define a pen. This is essentially a synonym for \code{Pen()};
-\class{Turtle} is an empty subclass of \class{Pen}.
-\end{classdesc}
-
-\begin{classdesc}{RawPen}{canvas}
-Define a pen which draws on a canvas \var{canvas}. This is useful if 
-you want to use the module to create graphics in a ``real'' program.
-\end{classdesc}
-
-\subsection{Turtle, Pen and RawPen Objects \label{pen-rawpen-objects}}
-
-Most of the global functions available in the module are also
-available as methods of the \class{Turtle}, \class{Pen} and
-\class{RawPen} classes, affecting only the state of the given pen.
-
-The only method which is more powerful as a method is
-\function{degrees()}, which takes an optional argument letting 
-you specify the number of units corresponding to a full circle:
-
-\begin{methoddesc}[Turtle]{degrees}{\optional{fullcircle}}
-\var{fullcircle} is by default 360. This can cause the pen to have any
-angular units whatever: give \var{fullcircle} 2*$\pi$ for radians, or
-400 for gradians.
-\end{methoddesc}