There is a proposed solution to all of this here:
https://github.com/matplotlib/matplotlib/pull/746
Please test -- I don't have any nxutils-using code myself, and
matplotlib itself has none. We should probably convert some of the
nxutils code in the wild into some unit tests.
Mike
On 03/08/2012 12:37 PM, Benjamin Root wrote:
On Thu, Mar 8, 2012 at 11:16 AM, Benjamin Root <ben.r...@ou.edu
<mailto:ben.r...@ou.edu>> wrote:
On Thu, Mar 8, 2012 at 10:47 AM, John Hunter <jdh2...@gmail.com
<mailto:jdh2...@gmail.com>> wrote:
On Thu, Mar 8, 2012 at 10:32 AM, Benjamin Root
<ben.r...@ou.edu <mailto:ben.r...@ou.edu>> wrote:
+1 as well. I just took another look at the Path object
and I see no such function. The lack of this function is
a problem for me as well in my existing apps. In order to
deprecate nxutils, this functionality needs to be added to
Path. Otherwise, nxutils *must* be reinstated before the
next release.
Michael has already agreed to make a nxutils compatibility
layer that would have the same interface as the old nxutils.
So we are talking about performance, not core functionality.
We should remember that Michael did the lion's share of the
work on porting mpl to python 3
(https://github.com/matplotlib/matplotlib/pull/565/commits).
He elected not to port all of the C++ if he could replace
some of the functionality with the core. So those who rely on
bare metal speed the you are getting in nxutils should step up
to either :
1) help with the port of nxutils to python 3
2) help with exposing methods in _path.cpp that are almost as
fast or faster
3) live with slower speeds in the compatibility layer he has
agreed to write
4) ask (nicely) for someone to help you
I prefer option 2 because this is fairly easy and avoids code
redundancy. It would take just a few lines of extra code to
do this with the python sequence protocol as inputs and python
lists as return values. It would take a bit more to support
numpy arrays as input and output, and we should get input from
Michael about the desirability of making _path.cpp depend on
numpy. I don't see the harm, but I'd like to verify.
In my opinion, a slower implementation in a
nxutils.py compatibility module is not a release stopper, even
if it is undesirable.
JDH
Don't get me wrong. If help is needed, I can certainly provide it
since it is my itch. I am just a little exasperated with how this
issue has been handled up to now. The shim is a very good idea
and it should have been done back when the py3k merge happened. I
didn't press the issue then because I was traveling and didn't
have time to examine the issue closely, and having _nxutils.so
still in my build hide the problem from me (my own fault).
As for shim implementation, I would be willing to accept a
slightly slower function now (with the promise of improvements
later), but if the implementation is too much slower, then effort
will need to be made to get it up to acceptable levels. I know of
several users **cough**my future employer**cough** who uses
functionality such as this, and they would not be happy if their
products are dragged down by such a bottleneck.
Probably about time I dug more into CXX wrapped stuff...
Ben Root
Looking over the code, it looks like we could generalize
point_in_path_impl() into points_in_path_impl(). The current code
iterates through the path vertices to test a single point. Putting
this action inside a loop (for each point that we want to test) would
mean that this iterator has to be processed each time, which I suspect
would kill performance when the number of vertices is far greater than
the number of test points.
Tinkering....
Ben Root
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