Bugs item #1514685, was opened at 2006-06-29 23:27
Message generated for change (Comment added) made by loewis
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Category: Python Library
Group: Python 2.5
>Status: Closed
>Resolution: Duplicate
Priority: 7
Submitted By: Lingl (gregorlingl)
Assigned to: Martin v. Löwis (loewis)
Summary: radians() doesn't work correctly
Initial Comment:
>>> from turtle import *
>>> left(90)
>>> heading()
90.0
>>> radians()
>>> heading()
90.0 # should give pi/2, i.e. 1.5707...
>>> forward(50) # turtle goes in direction 90 rad
# i.e. approx. 116.62 degrees
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>Comment By: Martin v. Löwis (loewis)
Date: 2006-07-03 12:29
Message:
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user_id=21627
This is essentially a duplicate of #1514693, which was fixed
with r47210.
Please provide patches as unified diffs in the future; they
would be much easier to process that way. See
http://www.python.org/dev/patches/
I don't think the top-level degrees functions should grow a
fullcircle argument: this is only to simplify the
implementation (i.e. having the state-changing code in a
single function). The end user is not expected to pass an
argument to degrees() or radians().
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Comment By: Lingl (gregorlingl)
Date: 2006-06-30 21:04
Message:
Logged In: YES
user_id=1547199
Making two changes will correct the bug:
(a) In RawPen.__init__():
def __init__(self, canvas):
self._canvas = canvas
self._items = []
self._tracing = 1
self._arrow = 0
self._delay = 10 # default delay for drawing
# patch for degrees()
## self.degrees() # replace by the following two lines
self._fullcircle = 360.0
self._invradian = pi/180.0
self.reset()
(b) in RawPen.degrees() :
def degrees(self, fullcircle=360.0):
""" Set angle measurement units to degrees.
Example:
>>> turtle.degrees()
"""
# patch for degrees(): add next line
self._angle=self._angle*fullcircle/self._fullcircle
self._fullcircle = fullcircle
self._invradian = pi / (fullcircle * 0.5)
Additional Remark: In order that the function degrees()
works identically to the method of same name it should be
written:
def degrees(fullcircle=360.0): _getpen().degrees(fullcircle)
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