[issue21077] Turtle Circle Speed 0

[Carol Willing]

Carol Willing  added the comment:

The next step on this issue would be to test if this behavior is still present 
in Python 3.6 and 3.7 and report the result of your test here.

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nosy: +willingc

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[issue21077] Turtle Circle Speed 0

[ingrid]

ingrid added the comment:

This seems to be caused by a bug in TurtleScreen.update/turtle._drawturtle. 
When the speed is set to zero, the tracer method is used to regulate drawing 
circles, and when called with a positive integer, tracer calls update. Update 
iterates over the list of existing turtle objects and then updates them and 
calls _drawturtle on them, then redraws them, but doesn't draw lines or stamps 
so they'll get drawn over by shapes and images. I attached a snippet that shows 
the bug happening when you call update directly, if you switch the last line 
and use tracer instead the same thing happens. I think the way to fix it is to 
add stamps and lines to _drawturtle so I'm going to work on a patch that uses 
that approach.

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nosy: +ingrid
Added file: http://bugs.python.org/file36646/update_example.py

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[issue21077] Turtle Circle Speed 0

[Ezio Melotti]

Changes by Ezio Melotti ezio.melo...@gmail.com:


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stage:  - needs patch
type:  - behavior

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[issue21077] Turtle Circle Speed 0

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


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versions: +Python 3.4, Python 3.5 -Python 3.3

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[issue21077] Turtle Circle Speed 0

[Garrett Grimsley]

New submission from Garrett Grimsley:

A circle is supposed to draw upon a click event, but if speed is set to 0 it 
appears that the circle fails to draw and all existing lines are erased.

A screenshot of the behavior with radius = 20 can be seen here: 
http://i.imgur.com/y7z87AN.png This state can be replicated by completing an 
entire game worth of clicks.



Someone replying to my StackOverflow question noted that if the radius of the 
circle is increased (radius = 200 for example) it becomes apparent that the 
circle  is actually drawing, but the existing lines are still erased. 

A screenshot of the behavior with radius = 200 can be seen here: 
http://i.imgur.com/gYeOlnT.png This state can be replicated by clicking bottom 
middle, middle middle, then bottom right, in that order.


You will note that only lines on the clickable Tic-Tac-Toe board are erased, 
and lines outside of it remain intact.


Load my code and click the Tic-Tac-Toe board to reproduce the bug. Please use 
my exact code, as you WILL fail to reproduce the bug by simply importing turtle 
and drawing a circle. To change the circle radius in my code locate the radius 
variable assignment in the draw_circle() function. It is located on line 77 of 
the code.


Source code in file is also available here: http://bpaste.net/show/189364/
Relevant StackExchange overflow link: 
http://stackoverflow.com/questions/22432679/turtle-circle-makes-lines-disappear/22445757

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components: Library (Lib)
files: aoeu.py
messages: 214963
nosy: Garrett.Grimsley, gregorlingl
priority: normal
severity: normal
status: open
title: Turtle Circle Speed 0
versions: Python 3.3
Added file: http://bugs.python.org/file34638/aoeu.py

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