matplotlib-devel Mailing List for matplotlib

Hi Andrew!

On Wed, Jun 16, 2010 at 3:45 PM, Andrew Straw <str...@as...> wrote:
> Hi Ondrej,
>
> If I was in your shoes, the first thing I'd do is emit your data to plot
> as a json object and then plot that data using javascript with one of
> the libraries you've listed. Then, after gaining some familiarity with

Thanks for the encouraging email. So I have code up a simple
prototype, using exactly the approach you suggested. Examples +
screenshot available at:

http://github.com/certik/jsplot

(just scroll down with your browser, github nicely renders the README.rst).

> Python->json->javascript I'd think about how such an MPL backend might
> work. A usecase I could imagine is some Django app that uses MPL to plot
> stuff into a javascript canvas element complete with zooming and so on.

Yes, I use django and instead of mpl, I use the flotr library, that
does zooming+plotting automatically.

>
> I think there are a lot of open questions in this domain... For example,
> presumably one doesn't want the server involved when the client browser
> zooms. But then if you implement something that allows the client
> browser to zoom without the server MPL process, you're no longer using
> the normal MPL callback system. So, interactivity would probably be

Yes, in fact, I am not using MPL at all.

> different than in the traditional backends.
>
> You could also start with the svg backend, as browsers do render svg.

I wonder what to do now. I think I'll just emulate the MPL api, that's
easy. Anyway, I can work finally.

Thanks for the help!

Ondrej

How do you deal with interactivity?

On Thu, Jun 17, 2010 at 9:57 AM, Ludwig Schwardt
<lud...@gm...>wrote:

> Hi,
>
> Simon Ratcliffe (the other Ratcliff :-)) and myself are working on an
> MPL backend that uses the HTML5 Canvas element. It is nearly done and
> soon to be released, once we get permission from our employer to
> release it under an open-source license. It does zooming and pretty
> good animation as well. It also has no additional dependencies except
> for Matplotlib and currently runs on the latest HTML5-compliant
> browsers (Chrome 4+, Safari 5, IE9 when released, Firefox nightlies).
>
> Some idea of its functionality can be seen at
> http://genotrak.webfactional.com/mplh5canvas/.
>
> We will keep the list updated on its progress.
>
> Regards,
> Ludwig Schwardt
>
>
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On Thu, Jun 17, 2010 at 6:57 AM, Ludwig Schwardt
<lud...@gm...> wrote:
> Hi,
>
> Simon Ratcliffe (the other Ratcliff :-)) and myself are working on an
> MPL backend that uses the HTML5 Canvas element. It is nearly done and
> soon to be released, once we get permission from our employer to
> release it under an open-source license. It does zooming and pretty
> good animation as well. It also has no additional dependencies except
> for Matplotlib and currently runs on the latest HTML5-compliant
> browsers (Chrome 4+, Safari 5, IE9 when released, Firefox nightlies).
>
> Some idea of its functionality can be seen at
> http://genotrak.webfactional.com/mplh5canvas/.
>
> We will keep the list updated on its progress.

That would be exactly what I need. Do you have any time frame for the
release? The problem is that I need it right now. So I'll try to
finish my own stuff today, so that I can at least work and then later
improve it or switch to your stuff.

Ondrej

Hi,

Simon Ratcliffe (the other Ratcliff :-)) and myself are working on an
MPL backend that uses the HTML5 Canvas element. It is nearly done and
soon to be released, once we get permission from our employer to
release it under an open-source license. It does zooming and pretty
good animation as well. It also has no additional dependencies except
for Matplotlib and currently runs on the latest HTML5-compliant
browsers (Chrome 4+, Safari 5, IE9 when released, Firefox nightlies).

Some idea of its functionality can be seen at
http://genotrak.webfactional.com/mplh5canvas/.

We will keep the list updated on its progress.

Regards,
Ludwig Schwardt

I'll take a look--but how do you handle interaction?  Does it end up having
to communicate back to the server?

On Thu, Jun 17, 2010 at 2:09 AM, John Hunter <jd...@gm...> wrote:

> On Wed, Jun 16, 2010 at 6:33 PM, william ratcliff
> <wil...@gm...> wrote:
> > I have a student here trying to make a webapp for data reduction.  To add
> > interactivity, we've been using the FLOT package, and may later consider
> > protovis.  We had thought about making a javascript backend for MPL, but
> to
> > just get something running, we went with FLOT for the time being...We're
> > using EXTJS as the web framework (it's a bit heavy, but has a rich widget
> > toolkit and documentation).  We use Django on the backend and Orbited to
> > deal with some communications between the browser and the server (for
> > example if we get new data from an instrument and want to update it on
> the
> > server and update plots that are viewing that data..).  Over the next
> couple
> > of weeks (with the arrival of another student), we will be working more
> with
> > the plotting aspect of the project (adding legends, zooming, etc).
> Also,
> > for other parts of the app, we're just using the HTML5 canvas...I'd be
> happy
> > to work on making the plotting addons as generic as possible so they can
> be
> > used outside of our problem domain.  What I'm not sure is whether one
> wants
> > to truly use MPL as a backend, or rather to use the MPL philosophy of a
> > javascript package.
>
>
> If anyone is interested in working on an html5 backend, we have a
> prototype here thanks to a GSOC applicant from last year
>
> http://bitbucket.org/sanxiyn/matplotlib-canvas/
>
> JDH
>

On Wed, Jun 16, 2010 at 6:33 PM, william ratcliff
<wil...@gm...> wrote:
> I have a student here trying to make a webapp for data reduction.  To add
> interactivity, we've been using the FLOT package, and may later consider
> protovis.  We had thought about making a javascript backend for MPL, but to
> just get something running, we went with FLOT for the time being...We're
> using EXTJS as the web framework (it's a bit heavy, but has a rich widget
> toolkit and documentation).  We use Django on the backend and Orbited to
> deal with some communications between the browser and the server (for
> example if we get new data from an instrument and want to update it on the
> server and update plots that are viewing that data..).  Over the next couple
> of weeks (with the arrival of another student), we will be working more with
> the plotting aspect of the project (adding legends, zooming, etc).   Also,
> for other parts of the app, we're just using the HTML5 canvas...I'd be happy
> to work on making the plotting addons as generic as possible so they can be
> used outside of our problem domain.  What I'm not sure is whether one wants
> to truly use MPL as a backend, or rather to use the MPL philosophy of a
> javascript package.


If anyone is interested in working on an html5 backend, we have a
prototype here thanks to a GSOC applicant from last year

http://bitbucket.org/sanxiyn/matplotlib-canvas/

JDH

www.reflectometry.org/flot/examples has some examples with zooming for flot.
  These seem ok for speed using firefox...How many data points?

William

On Wed, Jun 16, 2010 at 9:07 PM, Ondrej Certik <on...@ce...> wrote:

> On Wed, Jun 16, 2010 at 6:01 PM, Ondrej Certik <on...@ce...> wrote:
> > On Wed, Jun 16, 2010 at 5:13 PM, william ratcliff
> > <wil...@gm...> wrote:
> >> Do you want the whole code base?
> >
> > Well, if you can send me something to start from, that'd be awesome. I
> > have put my initial code here:
> >
> > http://github.com/certik/jsplot
> >
> > it uses django + raphael. Now I need to write a simple MPL like api,
> > and also implement zoom somehow.
> > I think I'll make it work for my purposes soon hopefully.
>
> These guys already implemented zoom in the flotr library:
>
>
> http://phenxdesign.net/projects/flotr/examples/prototype/mouse-zoom-preview.html
>
> So maybe I'll just use that. In FF3 it's terribly slow though...
>
> Ondrej
>

On Wed, Jun 16, 2010 at 6:01 PM, Ondrej Certik <on...@ce...> wrote:
> On Wed, Jun 16, 2010 at 5:13 PM, william ratcliff
> <wil...@gm...> wrote:
>> Do you want the whole code base?
>
> Well, if you can send me something to start from, that'd be awesome. I
> have put my initial code here:
>
> http://github.com/certik/jsplot
>
> it uses django + raphael. Now I need to write a simple MPL like api,
> and also implement zoom somehow.
> I think I'll make it work for my purposes soon hopefully.

These guys already implemented zoom in the flotr library:

http://phenxdesign.net/projects/flotr/examples/prototype/mouse-zoom-preview.html

So maybe I'll just use that. In FF3 it's terribly slow though...

Ondrej

On Wed, Jun 16, 2010 at 5:13 PM, william ratcliff
<wil...@gm...> wrote:
> Do you want the whole code base?

Well, if you can send me something to start from, that'd be awesome. I
have put my initial code here:

http://github.com/certik/jsplot

it uses django + raphael. Now I need to write a simple MPL like api,
and also implement zoom somehow.
I think I'll make it work for my purposes soon hopefully.

Ondrej