[issue11096] Multiple turtle tracers

[Terry J. Reedy]

Changes by Terry J. Reedy :


--
resolution:  -> out of date
stage:  -> committed/rejected
status: open -> closed

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[issue11096] Multiple turtle tracers

[Terry J. Reedy]

Terry J. Reedy  added the comment:

2.6 is only open for security fixes.

In 3.x "The methods Turtle.tracer(), Turtle.window_width() and 
Turtle.window_height() have been eliminated. Methods with these names and 
functionality are now available only as methods of Screen."

So it seems that perhaps the fix was to make what you did impossible ;-). 
Hence, I am inclined to close this as 'out-of-date'. The deletion was not done 
in 2.7 for back-compatibility reasons.

Replacing "t.tracer(10)" with "\nScreen().tracer(10)", the rosette is drawn 
in under a second (on my several-year-old machine). I cannot see any difference.

--
nosy: +gregorlingl, terry.reedy
versions:  -Python 2.6

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[issue11096] Multiple turtle tracers

[Alex McNerney]

Alex McNerney  added the comment:

To be more clear, in the sample code, the drawing animation of the red 
star-spiral is smooth, whereas the drawing animation of the black star-spiral 
is spasmodic.

--

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[issue11096] Multiple turtle tracers

[Alex McNerney]

New submission from Alex McNerney :

In Python 2.7 and 2.6 (only ones I have tried), there is a bug in the turtle 
module's tracer() function, when applying it to multiple turtles using the same 
value.

When two turtles are defined (to draw simultaneously), and both turtles' 
tracers are set to the same number, one of the turtles does not end up 
following its tracer value. (It's a little hard to explain...look at/try the 
sample code)

The following script will recreate this glitch:
"
from turtle import *

t1 = Turtle()
t2 = Turtle()

for t in turtles():
t.ht()
t.speed(0)
t.tracer(10)

t1.color("black")
t2.color("red")

for x in range(500):
t1.forward(x)
t2.forward(x)
t1.left(144.5)
t2.right(144.5)
"

--
messages: 127718
nosy: amcnerney13
priority: normal
severity: normal
status: open
title: Multiple turtle tracers
type: behavior
versions: Python 2.6, Python 2.7

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