matplotlib-users

Re: [Matplotlib-users] zoom on

[Jean-Michel P. <jea...@ir...>]

ste...@cs... wrote:
> Zooming is available via the widgets at the bottom of the plot menu by
> default.

Ok but I would like to activate zooming for users within the program. 
The purpose is to display all the figures with the zoom activated by 
default because in this (small) application users always have to zoom.

JM.

Re: [Matplotlib-users] zoom on

[Jean-Michel P. <jea...@ir...>]

ste...@cs... wrote:
> You want the initial graph to come up already zoomed in, is that it?

yes, that's exactly this!

JM.

Re: [Matplotlib-users] zoom on

[Jean-Michel P. <jea...@ir...>]

jdh...@ac... wrote:
> Indeed.  Unfortunately, in the current implementation, all the logic
> is in the toolbar itself.  On the dev list there was some discussion
> in the last few weeks on how to modularize the toolbar base class code
> (matplotlib.backend_bases.NavigationToolbar2), with an implementation
> that factored out all of this code into independent pieces.  This was
> done to support a user customizable and extensible toolbar, but might
> have wider application as this thread suggests, eg to support a
> default navigation mode in the absence of any toolbar at all.
> Unfortunately, I haven't had time to investigate this or include it as
> a patch yet.

Would it be possible to add some facilities to get a list of the method 
associated to each toolbar button in order to call the underlying 
function directly from within the program?
(I'm not sure this very clear... The idea is to be able to perform some 
actions automatically while creating figures instead of waiting for 
mouse button clicks - e.g. the command 'grid(1)' displays grids and this 
feature could also be accessed from a toolbar button)

> So in the current implementation, you have to call the 'pan' method of
> the toolbar to set the pan/zoom functionality and the 'zoom' method to
> activate zoom to rect.
> 
> The following untested code should work across backends from the
> matlab interface (using the API, you can access the toolbar instance
> more directly)
> 
>   manager = get_current_fig_manager()
>   toolbar = manager.canvas.toolbar
>   toolbar.pan()   # activate pan w/ left and zoom w/ right by default

Ok, with TkAgg / matplotlib 0.62.4 I just had to use 'manager.toolbar' 
instead of 'manager.canvas.toolbar'. Obviously pan() is used to move the 
figure view and zoom() to let the user draw rectangles around the region 
to be zoomed. This is the last one which I needed:

 > manager = get_current_fig_manager()
 > manager.toolbar.zoom()

(Thanks, I always knew this would be few code lines!)

> I think your idea of adding a 'zoom on' function which can be called
> from the matlab interface is a good one; any idea if there is a matlab
> analog for activating zoom to rect?
> 

Indeed 'zoom' activates zoom to rectangular region as toolbar.zoom() 
does. The only difference is that zoom in Matlab is able to toggle or to 
set the zoom state depending on the input args:

zoom		-> toggles the zoom
zoom on		-> turn it on
zoom off	-> turn it off

So the previous code only mimics the first implementation. As I don't 
know how to get the zoom state, I cannot propose a full Matlab 
replacement to the 'zoom' function. Perhaps the modularized toolbar 
could introduce this feature for each button with a simple code like this:

def myButtonCallBackFunc(state=-1):
	if state == -1:
		# toggle
	elif state == 0:
		# reset
	elif state == 1;
		# set
	else:
		#raise error

Doing this each toolbar button would be easy to toggle or turn on/off 
from code and we could easily implement a matplotlib version of the 
Matlab 'zoom' function.



JM. Philippe

Re: [Matplotlib-users] zoom on

[Stephen W. <ste...@cs...>]

On Thu, 2004-09-02 at 01:33, Jean-Michel Philippe wrote:
> ste...@cs... wrote:
> > Zooming is available via the widgets at the bottom of the plot menu by
> > default.
>=20
> Ok but I would like to activate zooming for users within the program.=20

You want the initial graph to come up already zoomed in, is that it?

--=20
Stephen Walton <ste...@cs...>
Dept. of Physics & Astronomy, CSU Northridge

Re: [Matplotlib-users] zoom on

[Darren D. <dd...@co...>]

Stephen Walton wrote:

>On Thu, 2004-09-02 at 01:33, Jean-Michel Philippe wrote:
>  
>
>>ste...@cs... wrote:
>>    
>>
>>>Zooming is available via the widgets at the bottom of the plot menu by
>>>default.
>>>      
>>>
>>Ok but I would like to activate zooming for users within the program. 
>>    
>>
>
>You want the initial graph to come up already zoomed in, is that it?
>  
>
In Matlab, you can create a plot, and then calling "zoom on" does the 
same thing as clicking the zoom button in MPL: it just gives zooming 
context to mouse clicks inside the axes. It would be helpful to know how 
to give such context to mouse clicks without having to include toolbar2 
in a figure.

Darren

Re: [Matplotlib-users] zoom on

[John H. <jdh...@ac...>]

>>>>> "Darren" == Darren Dale <dd...@co...> writes:

    Darren> In Matlab, you can create a plot, and then calling "zoom
    Darren> on" does the same thing as clicking the zoom button in
    Darren> MPL: it just gives zooming context to mouse clicks inside
    Darren> the axes. It would be helpful to know how to give such
    Darren> context to mouse clicks without having to include toolbar2
    Darren> in a figure.

Indeed.  Unfortunately, in the current implementation, all the logic
is in the toolbar itself.  On the dev list there was some discussion
in the last few weeks on how to modularize the toolbar base class code
(matplotlib.backend_bases.NavigationToolbar2), with an implementation
that factored out all of this code into independent pieces.  This was
done to support a user customizable and extensible toolbar, but might
have wider application as this thread suggests, eg to support a
default navigation mode in the absence of any toolbar at all.
Unfortunately, I haven't had time to investigate this or include it as
a patch yet.

So in the current implementation, you have to call the 'pan' method of
the toolbar to set the pan/zoom functionality and the 'zoom' method to
activate zoom to rect.

The following untested code should work across backends from the
matlab interface (using the API, you can access the toolbar instance
more directly)

  manager = get_current_fig_manager()
  toolbar = manager.canvas.toolbar
  toolbar.pan()   # activate pan w/ left and zoom w/ right by default

Note that calling this function toggles the current state, as does the
'zoom' function.

I think your idea of adding a 'zoom on' function which can be called
from the matlab interface is a good one; any idea if there is a matlab
analog for activating zoom to rect?

Thanks,
JDH