matplotlib-users

[Matplotlib-users] preventing scaling view after updating plot

[C M <cmp...@gm...>]

(mpl 0.98.5 OO embedded in wx)

Hi, I'm trying to highlight a picked datapoint, such as is shown in
this thread:

http://www.mail-archive.com/mat...@li.../msg05580.html

As John suggested there, I get the index of the picked point, and then
plot a marker on that point.  I am using the OO mpl form, so then
I call, to draw this new point on the canvas:

self.canvas.draw()
(self.canvas is a figure.canvas object).

But when I do this it *rescales the plot*, which I don't want.  In this thread:

http://www.nabble.com/Re%3A-Plotting-single-marker-point-at-zoomed-level-p17511209.html

I found someone mentioning this concern.  He said:

> Thanks for that, the canvas.draw() function redraws the graph.
> I had to add the "autoscale_on=False" to the add_subplot()
> to stop the graph from autoscaling.

I tried this, and it did stop autoscaling--but I do want y autoscaling.
What I want is y autoscaling but not y autoscaling (just setting xlims).
I tried adding either of these lines right before or right after when I plotted
the highlighted point:

self.subplot.set_autoscale_on(False)
self.subplot.autoscale_view(tight=False, scalex=False, scaley=True)

and it didn't help--the plot rescaled, both x and y.

Any ideas what I'm doing wrong?

Thanks,
Che

Re: [Matplotlib-users] preventing scaling view after updating plot

[C M <cmp...@gm...>]

>
> I tried this, and it did stop autoscaling--but I do want y autoscaling.
> What I want is y autoscaling but not y autoscaling (just setting xlims).
> I tried adding either of these lines right before or right after when I plotted
> the highlighted point:

Just to be clearer:  What I want is the plot to stay precisely the same
when I add the highlighted point.  But now I have either of two undesired
alternatives:

1) I do add_subplot(111,autoscale_on=False) when I create the
subplot and none of my plots have the y scaled (but I want them scaled).

2) I do add_subplot(111) and when I add a highlighted datapoint it
autoscales my plot (but I don't want that).

Thanks,
Che

Re: [Matplotlib-users] preventing scaling view after updating plot

[Ryan M. <rm...@gm...>]

On Thu, Apr 9, 2009 at 1:04 AM, C M <cmp...@gm...> wrote:

> >
> > I tried this, and it did stop autoscaling--but I do want y autoscaling.
> > What I want is y autoscaling but not y autoscaling (just setting xlims).
> > I tried adding either of these lines right before or right after when I
> plotted
> > the highlighted point:
>
> Just to be clearer:  What I want is the plot to stay precisely the same
> when I add the highlighted point.  But now I have either of two undesired
> alternatives:
>
> 1) I do add_subplot(111,autoscale_on=False) when I create the
> subplot and none of my plots have the y scaled (but I want them scaled).
>
> 2) I do add_subplot(111) and when I add a highlighted datapoint it
> autoscales my plot (but I don't want that).
>

If you upgrade to SVN head, it supports what you want.  You can use:

add_subplot(111, autoscalex_on=False)

I don't think this particular feature has made it into a release yet.

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

Re: [Matplotlib-users] preventing scaling view after updating plot

[C M <cmp...@gm...>]

On Thu, Apr 9, 2009 at 9:25 AM, Ryan May <rm...@gm...> wrote:
> On Thu, Apr 9, 2009 at 1:04 AM, C M <cmp...@gm...> wrote:
>>
>> >
>> > I tried this, and it did stop autoscaling--but I do want y autoscaling.
>> > What I want is y autoscaling but not y autoscaling (just setting xlims).
>> > I tried adding either of these lines right before or right after when I
>> > plotted
>> > the highlighted point:
>>
>> Just to be clearer:  What I want is the plot to stay precisely the same
>> when I add the highlighted point.  But now I have either of two undesired
>> alternatives:
>>
>> 1) I do add_subplot(111,autoscale_on=False) when I create the
>> subplot and none of my plots have the y scaled (but I want them scaled).
>>
>> 2) I do add_subplot(111) and when I add a highlighted datapoint it
>> autoscales my plot (but I don't want that).
>
> If you upgrade to SVN head, it supports what you want.  You can use:
>
> add_subplot(111, autoscalex_on=False)
>
> I don't think this particular feature has made it into a release yet.
>
> Ryan
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma

Wow, thanks Ryan.  This is the beauty of an email list.  I'll try to
get it from SVN or back-burner this issue until the next release.

Che