Issue #10199: Moved Demo/turtle under Lib/

1 files changed, 76 insertions, 0 deletions

diff --git a/Lib/turtledemo/about_turtle.txt b/Lib/turtledemo/about_turtle.txt
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+
+========================================================
+    A new turtle module for Python
+========================================================
+
+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. 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.left(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 stgretched and tilted, which
+    makes turtles zu 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 graphcis.
+
+- 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.