Re: [pygame] fast sqrt? and profiling

[Lenard Lindstrom <len-l@xxxxxxxxx>]

>>> class vector2(complex):
...     def __getitem__(self, index):
...         if index == 0:
...             return self.real
...         elif index == 1:
...             return self.imag
...         else:
...             raise IndexError("index out of range 0..1")
...    
...     def __iter__(self):
...         return iter((self.real, self.imag))
...
>>> v = vector2(1.0, 3.0)
>>> v[0]
1.0
>>> v[1]
3.0
>>> v[2]
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 8, in __getitem__
IndexError: index out of range 0..1
>>> (x, y) = v
>>> x
1.0
>>> y
3.0


Casey Duncan wrote:
> Yes, complex numbers are built in and implemented in C, whereas Euclid 
> is not and implemented in python. The downside to using complex is 
> that they cannot be indexed or unpacked for passing into apis that 
> expect sequences for vectors (hence the to_tuple() function).
>
> -Casey
>
> On Jan 22, 2009, at 11:36 PM, Emile Kroeger wrote:
>
> > Oh, I guess they are pretty much equivalent, even though Casey seems
> > to say complex have better performance than euclid.
> >
> > I just use complex because it's available out of the box with Python
> > :) (and because I didn't know about Euclid; maybe I'll use it if I do
> > 3D)
--
Lenard Lindstrom
<len-l@xxxxxxxxx>