Dear Linda,
> I have a segment (two ending points are A and B) which is 0 degree.
> How to draw a segment with 10 degrees and 15 in length?
It is very simple with complex numbers:
import math
class vect:
## begin and end are tuples (x, y)
## and represented as complex numbers
def __init__(self, begin, end):
self.begin = complex(begin[0], begin[1])
self.end = complex(end[0], end[1])
def Rotate(self, deg=0):
rad = math.radians(deg)
rot = complex(math.cos(rad), math.sin(rad))
self.end = self.begin + (self.end-self.begin)*rot
def SetLength(self, length):
dist = self.end - self.begin
actlength = math.sqrt(dist.real**2 + dist.imag**2)
dist = dist * length / actlength
self.end = self.begin + dist
def __str__(self):
return '(%.2f, %.2f)->(%.2f, %.2f)' % \
(self.begin.real, self.begin.imag, self.end.real,
self.end.imag)
v = vect((10,0),(20,0))
print 'orig:', v
v.Rotate(10)
print 'rotated:', v
v.SetLength(15)
print 'sretched:', v
It seems to be a kind of homework,
but I wanted to test how can I response in a thread.
All of my earlier responses started new threads in this list like this
http://mail.python.org/pipermail/tutor/2007-January/052169.html.
Have I remove the '[Tutor]' or '[Tutor] ' from the subject of the response
?
Do I need any special about the mail in notes ?
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Karl
Wittgenstein
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Geoframer
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Geoframer
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Geoframer
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Danny Yoo
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Karl
Wittgenstein
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Karl
Wittgenstein
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Kent Johnson
[Tutor] 'elp!!!!!!!1Totally Clueless Newbie In Distress Karl
Wittgenstein
I don't understand how these threads are built up. The subject fields
seems to be identicals.
Is there used anything else than the subject field for recognize the base
of the response ?
RTFM about how to respond to this list is welcomed with valuable links.
Regards:
___________
Janos Juhasz
_______________________________________________
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