This adds new methods heading(), setheading(), position(),
window_width(), window_height(), setx(), and sety(), to make this more
functionality-compatible with Logo turtle graphics (Attila's last
words, not mine :-). I had to fix the sety() code which was broken in
Attila's patch.
I'm not adopting the functionality change that Attila claimed was a
bugfix (no output without tracing), because I disagree that it's a
bug.
Python's logolike module turtle.py did not display
the turtle except when actually drawing lines.
This patch changes the turtle.py module so that
it displays the turtle at all times when tracing is
on. This is similar to the the way that logo works.
When tracing is off the turtle will not be displayed.
Guido van Rossum
Martin v. Löwis
Fred Drake