mirror of
https://github.com/python/cpython.git
synced 2024-11-29 12:54:02 +08:00
76 lines
2.4 KiB
Plaintext
76 lines
2.4 KiB
Plaintext
|
|
|
|
----------------------------------------------
|
|
|
|
turtleDemo - Help
|
|
|
|
----------------------------------------------
|
|
|
|
This document has two sections:
|
|
|
|
(1) How to use the demo viewer
|
|
(2) How to add your own demos to the demo repository
|
|
|
|
|
|
(1) How to use the demo viewer.
|
|
|
|
Select a demoscript from the example menu.
|
|
The (syntax coloured) source code appears in the left
|
|
source code window. IT CANNOT BE EDITED, but ONLY VIEWED!
|
|
|
|
- Press START button to start the demo.
|
|
- Stop execution by pressing the STOP button.
|
|
- Clear screen by pressing the CLEAR button.
|
|
- Restart by pressing the START button again.
|
|
|
|
SPECIAL demos are those which run EVENTDRIVEN.
|
|
(For example clock.py - or oldTurtleDemo.py which
|
|
in the end expects a mouse click.):
|
|
|
|
Press START button to start the demo.
|
|
|
|
- Until the EVENTLOOP is entered everything works
|
|
as in an ordinary demo script.
|
|
|
|
- When the EVENTLOOP is entered, you control the
|
|
application by using the mouse and/or keys (or it's
|
|
controlled by some timer events)
|
|
To stop it you can and must press the STOP button.
|
|
|
|
While the EVENTLOOP is running, the examples menu is disabled.
|
|
|
|
- Only after having pressed the STOP button, you may
|
|
restart it or choose another example script.
|
|
|
|
* * * * * * * *
|
|
In some rare situations there may occur interferences/conflicts
|
|
between events concerning the demo script and those concerning the
|
|
demo-viewer. (They run in the same process.) Strange behaviour may be
|
|
the consequence and in the worst case you must close and restart the
|
|
viewer.
|
|
* * * * * * * *
|
|
|
|
|
|
(2) How to add your own demos to the demo repository
|
|
|
|
- scriptname: must begin with tdemo_ ,
|
|
so it must have the form tdemo_<your-script-name>.py
|
|
|
|
- place: same directory as turtleDemo.py or some
|
|
subdirectory, the name of which must also begin with
|
|
tdemo_.....
|
|
|
|
- requirements on source code:
|
|
code must contain a main() function which will
|
|
be executed by the viewer (see provided example scripts)
|
|
main() may return a string which will be displayed
|
|
in the Label below the source code window (when execution
|
|
has finished.)
|
|
|
|
!! For programs, which are EVENT DRIVEN, main must return
|
|
!! the string "EVENTLOOP". This informs the viewer, that the
|
|
!! script is still running and must be stopped by the user!
|
|
|
|
|
|
|