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| -rw-r--r-- | Lib/turtledemo/demohelp.txt | 83 |
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diff --git a/Lib/turtledemo/demohelp.txt b/Lib/turtledemo/demohelp.txt deleted file mode 100644 index 11842e10d3..0000000000 --- a/Lib/turtledemo/demohelp.txt +++ /dev/null @@ -1,83 +0,0 @@ - - - ---------------------------------------------- - - 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 - - - Place the file in the same directory as turtledemo/__main__.py - IMPORTANT! When imported, the demo should not modify the system - by calling functions in other modules, such as sys, tkinter, or - turtle. Global variables should be initialized in main(). - - - The code must contain a main() function which will - be executed by the viewer (see provided example scripts). - It may return a string which will be displayed in the Label below - the source code window (when execution has finished.) - - - In order to run mydemo.py by itself, such as during development, - add the following at the end of the file: - - if __name__ == '__main__': - main() - mainloop() # keep window open - - python -m turtledemo.mydemo # will then run it - - - If the demo is EVENT DRIVEN, main must return the string - "EVENTLOOP". This informs the demo viewer that the script is - still running and must be stopped by the user! - - If an "EVENTLOOP" demo runs by itself, as with clock, which uses - ontimer, or minimal_hanoi, which loops by recursion, then the - code should catch the turtle.Terminator exception that will be - raised when the user presses the STOP button. (Paint is not such - a demo; it only acts in response to mouse clicks and movements.) |