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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}{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}