[Edu-sig] odd drawing problem with turtle.py

Brian Blais bblais at bryant.edu
Mon Feb 1 12:27:27 CET 2010


> On Jan 31, 2010, at 23:05 , John Posner wrote:
>
>> Try commenting out this statement:
>>
>>    self.turtle.tracer(False)
>>
>> That helps on Python 2.6.4.


interesting.  It seems as if the tracer property is a global one:

In [1]:t1=Turtle()

In [2]:t1.tracer()
Out[2]:1

In [3]:t1.tracer(False)

In [4]:t1.tracer()
Out[4]:0

In [5]:t2=Turtle()

In [6]:t2.tracer()
Out[6]:0

In [7]:t2.tracer(True)

In [8]:t1.tracer()
Out[8]:1

looks like I need to set the tracer manually.

however, even if the tracer is off, shouldn't it still draw the  
line?  when I put in the T.tracer(True) it works, but I shouldn't  
need to I think.


On Jan 31, 2010, at 21:11 , kirby urner wrote:

> I don't see where you've defined a Turtle class to instantiate sir.

Turtle is given in turtle.py.  I should have subclassed it, but I was  
being lazy.  :)

thanks for the fast replies!


			bb


> On Sun, Jan 31, 2010 at 4:27 PM, Brian Blais <bblais at bryant.edu>  
> wrote:
>> I'm on Python 2.5, but using the updated turtle.py Version 1.0.1 -  
>> 24. 9.
>> 2009.  The following script draws 5 circles, which it is supposed  
>> to, but
>> then doesn't draw the second turtle which is supposed to simply move
>> forward.  Any ideas?
>> from turtle import *
>> from numpy.random import randint
>> resetscreen()
>> class Circle(object):
>>     def __init__(self,x,y,r,color):
>>         self.x=x
>>         self.y=y
>>         self.r=r
>>         self.color=color
>>
>>         self.turtle=Turtle(visible=False)
>>         self.turtle.tracer(False)
>>         self.draw()
>>
>>     def draw(self):
>>         self.turtle.penup()
>>         self.turtle.setposition(self.x,self.y)
>>         self.turtle.setheading(0)
>>         self.turtle.backward(self.r)
>>         self.turtle.pendown()
>>         self.turtle.fill(True)
>>         self.turtle.pencolor("black")
>>         self.turtle.fillcolor(self.color)
>>         self.turtle.circle(self.r)
>>         self.turtle.fill(False)
>>         self.turtle.penup()
>>
>> for i in range(5):
>>     c=Circle(randint(-350,350),randint(-250,250),10,"red")
>>
>>
>> T=Turtle()
>> T.forward(100)
>> T.forward(100)
>>
>>
>>
>>
>>
>>
>>
>> thanks,
>>
>> bb
>> --
>> Brian Blais
>> bblais at bryant.edu
>> http://web.bryant.edu/~bblais
>> http://bblais.blogspot.com/
>>
>>
>>
>> _______________________________________________
>> Edu-sig mailing list
>> Edu-sig at python.org
>> http://mail.python.org/mailman/listinfo/edu-sig
>>
>>

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais
http://bblais.blogspot.com/



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