[Numpy-discussion] convert array to tuples?
seb.haase at gmail.com
Tue Apr 5 13:52:05 EDT 2011
On Tue, Apr 5, 2011 at 7:02 PM, Christopher Barker
<Chris.Barker at noaa.gov> wrote:
> HI folks,
> What's the fastest way to convert a numpy array to tuples?
> Unfortunately, not all packages take arbitrary sequences when they are
> expecting a list of tuples. In this case, I'm using PIL's ImageDraw, and
> want to do:
> (points is an Nx2 numpy array of ints)
> but if I pass in an array, I get, oddly enough, nothing. NO error, just
> nothing drawn.
> if I do:
> SystemError: new style getargs format but argument is not a tuple
> So I seem to need tuples. This works:
> draw.line([tuple(p) for p in points.tolist()])
> but that seems like it would be slower than it should be (to be honest,
> not profiled).
> Is there a faster way?
> Maybe numpy should have a ndarray.totuple() method.
How about fixing PIL... I know that there is not a good track record
of getting patches into PIL ,
but did you get to the bottom of it and find how draw.line is implemented?
BTW, is it drawing anti-aliased lines ?
- Sebastian Haase
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