matplotlib-devel Mailing List for matplotlib

Hi Chris and others,
On 11/23/11 12:39 PM, Chris Barker wrote:
> On 11/23/11 10:38 AM, Benjamin Root wrote:
> 
> 
> > There is an HTML5 backend, supposedly. Don't know how well documented it is, though.
> > 
> 
> Hmm -- coll idea -- I'll look into that at some point. However, as I
> don't need the MPL machinerey, but just the renderer, I'm not sure it
> would buy me much.
> 
> And I'm not sure I can:
> 
> a) count on html 5 on all browsers we need to support
> 
> or
> 
> b) get the drawing performance I want if I have to push all the data to
> the client to draw.
> 
> But something to keep an eye on, thanks.
Ben is referring to mplh5canvas, available at http://code.google.com/p/mplh5canvas/. The main advantage of this approach is interactive zooming of plots within the browser. If this is not important to you, it will probably be faster to generate static PNGs or SVGs.
The HTML5 backend should be easy to try out, as it is a pure Python package with no onerous dependencies.
I'll try to address your concerns mentioned above:
a) The Canvas element is quite well supported in modern browsers, but the WebSocket component (used to communicate between the matplotlib backend "server" code in Python and the "client" code on the browser in JavaScript) is a bit trickier to support.
b) Here the matplotlib machinery actually helps, by reducing the primitives to draw via path simplification before sending them to the client browser.
We have also used flot (http://code.google.com/p/flot/) for simple time-series plots without matplotlib. I'm not sure how well it performs on large data sets, though.
Regards,
Ludwig

On Sunday, November 27, 2011, Roberto Colistete Jr. <
rob...@gm...> wrote:
> Hi,
>
> In MatPlotLib 1.0.0 the example 'mplot3d/surface3d_demo.py' has the
> line :
> ax.set_zlim3d(-1.01, 1.01)
> while the same file in MatPlotLib 1.1.0 has :
> ax.set_zlim(-1.01, 1.01)
>
> If I try to use ax.set_zlim(-1.01, 1.01) with MatPlotLib 1.0.0 I get :
> "$ python surface3d_demo.py
> Traceback (most recent call last):
> File "surface3d_demo.py", line 16, in <module>
> ax.set_zlim(-1.01, 1.01)
> AttributeError: 'Axes3DSubplot' object has no attribute 'set_zlim'"
>
> So what is the recommended way for maximum compatibility
> (1.0.0/1.1.0) ? Use 'set_zlim' or 'set_zlim3d ?
>
> Thanks in advance,
>
> Roberto
>
What is recommended is to upgrade to v1.1.0 where the behavior is much more
intuitive and follows expected conventions. If that is not possible, then
use set_*lim3d().
Ben Root

 Hi,
 In MatPlotLib 1.0.0 the example 'mplot3d/surface3d_demo.py' has the 
line :
ax.set_zlim3d(-1.01, 1.01)
while the same file in MatPlotLib 1.1.0 has :
ax.set_zlim(-1.01, 1.01)
 If I try to use ax.set_zlim(-1.01, 1.01) with MatPlotLib 1.0.0 I get :
"$ python surface3d_demo.py
Traceback (most recent call last):
 File "surface3d_demo.py", line 16, in <module>
 ax.set_zlim(-1.01, 1.01)
AttributeError: 'Axes3DSubplot' object has no attribute 'set_zlim'"
 So what is the recommended way for maximum compatibility 
(1.0.0/1.1.0) ? Use 'set_zlim' or 'set_zlim3d ?
 Thanks in advance,
 Roberto

On 11/23/11 10:13 AM, Friedrich Romstedt wrote:
> 2011年11月23日 Chris.Barker<Chr...@no...>:
>> I've got some drawing to do (for a web app). I don't need all the MPL
>> machinery, but I do need a high quality, fast, renderer.
>
> http://www.effbot.org/zone/aggdraw-index.htm
I've been wondering about that -- it doesn't look terribly maintained -- 
no updates for a long time, and I'm concerned about performance 99 if 
you are drawing something simple, but with lot's of points, all that 
conversion from numpy types to python type to C types is going to be an 
issue.
> http://www.effbot.org/imagingbook/imagedraw.htm
this is definitely slow for what I'm doing.
Thanks,
 -Chris
-- 
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...