matplotlib-users

[Matplotlib-users] pan/zoom axes problem

[Vicent M. <uv...@gm...>]

Hi,

I'm a newbie to matplotlib. I'm embedding matplotlib (0,98.5.3) in a
pyqt application. I'm using the qt4 backend and its navigation
toolbar.

I wish to execute a certain function every time the view interval of
a figure is  changed interactively  (i.e. using the zoom rectangle or
the
axes pan/zoom button of the navigation toolbar). I'm interested in
changes due to axes zoom and rectangle zoom but not in changes due
axes pan. The only way I know for detecting this changes is
'x/ylim_changed' events. Unfortunately I don't know how to distinguish
if the
event is caused by a rectangle zoom, an axes zoom or an axes pan.
I've read the events section of the documentation and searched the
archives for a solution with no luck. Could somebody help me to
solve this problem?

Thanks in advance.

Vicent

PS:

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Re: [Matplotlib-users] pan/zoom axes problem

[Vicent M. <uv...@gm...>]

Hi Matthias,

2009/9/3 Matthias Michler <Mat...@gm...>:
> Hi Vicent,
>
> I think the following example may help you, althogh their might be a better
> way:
>

thanks for your answer. It really helps. I didn't know about the mode
attribute of navigation toolbars. Inspecting the
NavigationToolbar2QTAgg class interactively with an IPython shell
doesn't show such attribute for this class. Maybe it is created
dynamically when the pan/zoom button is clicked?

Now I still have to find out how to distinguish axes pan from axes
zoom cases. I suppose I can use 'button_press_event' canvas events and
use the button attribute of these events for knowing if the user is
doing a pan or a zoom: pan/zoom mode + left button --> user is panning
axes, pan/zoom mode + right button --> user is zooming axes. Right?

Anyway, thanks again for your help.

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Share what you know, learn what you don't.

Re: [Matplotlib-users] pan/zoom axes problem

[Vicent M. <uv...@gm...>]

Hi Matthias ,

thanks a lot for your explanations. They were very useful.

Vicent

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Re: [Matplotlib-users] pan/zoom axes problem

[Thomba <tho...@ho...>]

Dear Vicent,

I'm struggling with embedding a navigation toolbar in a QT4 application with
matplotlib canvas. Could you please send me an example code of how I add the
navigation toolbar in the first place?

As you notice, I'm a real newbe!

Thank you very much,

Thom



Vicent Mas-2 wrote:
> 
> Hi Matthias ,
> 
> thanks a lot for your explanations. They were very useful.
> 
> Vicent
> 
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Re: [Matplotlib-users] pan/zoom axes problem

[Vicent M. <uv...@gm...>]

> Dear Vicent,
> 
> I'm struggling with embedding a navigation toolbar in a QT4 application
>  with matplotlib canvas. Could you please send me an example code of how I
>  add the navigation toolbar in the first place?
> 
> As you notice, I'm a real newbe!
> 
> Thank you very much,
> 
> Thom
> 
> Vicent Mas-2 wrote:
> > Hi Matthias ,
> >
> > thanks a lot for your explanations. They were very useful.
> >
> > Vicent
> 

Hi,

you can start here (it is what I did :-):

http://eli.thegreenplace.net/2009/05/23/more-pyqt-plotting-demos/

Hope it helps.

Vicent
::

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