fit in the default width of the text window (45 chars).
(2) How to add your own demos to the demo repository
- - place: same directory as turtledemo/__main__.py
+ - Place the file in the same directory as turtledemo/__main__.py
- - 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.)
+ - 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.)
- 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!
+ - In order to run mydemo.py by itself, such as during development,
+ add the following at the end of the file:
- 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.)
+ if __name__ == '__main__':
+ main()
+ mainloop() # keep window
+ 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.)
tdemo_forest.py
-Displays a 'forest' of 3 'breadth-first-trees'
-similar to the one from example tree.
-For further remarks see xtx_tree.py
+Displays a 'forest' of 3 breadth-first-trees
+similar to the one in tree.
+For further remarks see tree.py
This example is a 'breadth-first'-rewrite of
-a Logo program written by Erich Neuwirth. See:
+a Logo program written by Erich Neuwirth. See
http://homepage.univie.ac.at/erich.neuwirth/
"""
from turtle import Turtle, colormode, tracer, mainloop
return "runtime: %.2f sec." % (b-a)
if __name__ == '__main__':
- msg = main()
- print(msg)
+ main()
mainloop()
tdemo_paint.py
-A simple eventdriven paint program
+A simple event-driven paint program
-- use left mouse button to move turtle
-- middle mouse button to change color
-- right mouse button do turn filling on/off
+- left mouse button moves turtle
+- middle mouse button changes color
+- right mouse button toogles betweem pen up
+(no line drawn when the turtle moves) and
+pen down (line is drawn). If pen up follows
+at least two pen-down moves, the polygon that
+includes the starting point is filled.
-------------------------------------------
Play around by clicking into the canvas
using all three mouse buttons.
tdemo_peace.py
-A very simple drawing suitable as a beginner's
-programming example.
-
-Uses only commands, which are also available in
-old turtle.py.
-
-Intentionally no variables are used except for the
-colorloop:
+A simple drawing suitable as a beginner's
+programming example. Aside from the
+peacecolors assignment and the for loop,
+it only uses turtle commands.
"""
from turtle import *
"royalblue1", "dodgerblue4")
reset()
- s = Screen()
+ Screen()
up()
goto(-320,-195)
width(70)
up()
goto(0,300) # vanish if hideturtle() is not available ;-)
- return "Done!!"
+ return "Done!"
if __name__ == "__main__":
main()
Planet has a circular orbit, moon a stable
orbit around the planet.
-You can hold the movement temporarily by pressing
-the left mouse button with mouse over the
-scrollbar of the canvas.
+You can hold the movement temporarily by
+pressing the left mouse button with the
+mouse over the scrollbar of the canvas.
"""
from turtle import Shape, Turtle, mainloop, Vec2D as Vec
return "Done!"
if __name__ == '__main__':
- msg = main()
- print(msg)
- #mainloop()
+ main()
+ mainloop()
(1) a tree-generator, where the drawing is
quasi the side-effect, whereas the generator
always yields None.
-(2) Turtle-cloning: At each branching point the
-current pen is cloned. So in the end there
-are 1024 turtles.
+(2) Turtle-cloning: At each branching point
+the current pen is cloned. So in the end
+there are 1024 turtles.
"""
from turtle import Turtle, mainloop
from time import clock
-#!/usr/bin/env python3
-## DEMONSTRATES USE OF 2 CANVASES, SO CANNOT BE RUN IN DEMOVIEWER!
-"""turtle example: Using TurtleScreen and RawTurtle
-for drawing on two distinct canvases.
+"""turtledemo.two_canvases
+
+Use TurtleScreen and RawTurtle to draw on two
+distinct canvases.
"""
+#The final mainloop only serves to keep the window open.
+
+#TODO: This runs in its own two-canvas window when selected in the
+#demoviewer examples menu but the text is not loaded and the previous
+#example is left visible. If the ending mainloop is removed, the text
+#Eis loaded, this run again in a third window, and if start is pressed,
+#demoviewer raises an error because main is not found, and then freezes.
+
from turtle import TurtleScreen, RawTurtle, TK
root = TK.Tk()
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