Re: [Matplotlib-users] Matplotlib navigation toolbar, save image & image text

[Benjamin R. <ben...@ou...>]

On Thu, Sep 6, 2012 at 4:37 PM, Jon Roadley-Battin <
jon...@gm...> wrote:

> On 6 September 2012 14:55, Jon Roadley-Battin
> <jon...@gm...> wrote:
> > On 6 September 2012 14:20, Benjamin Root <ben...@ou...> wrote:
> >>
> >>
> >> On Thu, Sep 6, 2012 at 5:29 AM, Jon Roadley-Battin
> >> <jon...@gm...> wrote:
> >>>
> >>> Good morning,
> >>>
> >>> I have an odd problem with saving plot images via the navigation bar
> >>> (unsure if it is unique to the navigation bar) if I have added custom
> >>> text.
> >>>
> >>> BACKGROUND.
> >>> I have a python gui which is used to connect to some hardware as a
> >>> diagnosis tool. Its a pyGTK program and on one ui tab there is an
> >>> embeded matplotlib plot.
> >>> Now some of the signals I plot rather than being a waveform is more of
> >>> a collection of flags (16bit but thats a by and by)
> >>> eg:
> >>>
> >>>
> >>>
> >>>
> >>> fault
> >>> 0  = fault1
> >>> 0 = fault2
> >>> 1 = fault3
> >>> 0 = fault4
> >>>
> >>>
> >>>
> >>> so for this  I can plot this and it will show 2 (possibly changing
> w.r.t.
> >>> time).
> >>> I then hook in via a onpick event such that if I click on a plot I
> >>> essentially do this:
> >>>
> >>>                     self.figtxt =
> >>> self.fig.text(0.79,0.92,'\n'.join(txt),va='top',
> >>> bbox=dict(boxstyle='round', facecolor='white',alpha=0.7))
> >>>                     self.plot_marker =
> >>>
> self.plot_area.plot(xdata,ydata,'x',color=event.artist.get_color(),ms=7)
> >>>
> >>> ie I put a cross where someone clicked (for indication) and I also
> >>> create a texxbox which lists human readable version of what bits are
> >>> set.
> >>> Great, really helpful in debugging.
> >>>
> >>> The issue is if you click on the save image icon on the navigation
> >>> toolbar it saves the waveform and legend BUT not the additional
> >>> content (the cross and the textbox).
> >>>
> >>>
> >>> any idea as to how todo this?
> >>>
> >>
> >> What you are describing should work as expected.  Is it possible that
> you
> >> could make a simple, self-contained version (hopefully it doesn't need
> to be
> >> embedded to reproduce the problem)?  Maybe a modification of one of the
> >> existing examples in the online docs might be able to reproduce your
> issue?
> >>
> >> Ben Root
> >>
> >
> > Good afternoon,
> > I agree it should work and the examples i have run allow this so this
> > is why I am looking over my specifics.
> > The only thing I can see is the examples call to add txt via an axes
> > entity, I have been doing it via a figure entity.
> >
> > I am going to re-write to draw on the axis (last time I did this it
> > didn't display hence going for a figure).
> >
> > If this doesn't work I shall strip the code down to a minimum example
> > demonstrating what I am describing
>
> Well I have narrowed down exactly what causes it and produced a
> stripped down piece of code that reproduces the effect.
>
> It is related to events. I use mpl_connect to connect two functions
> #1  onpick - when a plot is picked annotate plot (in practice IF it is
> a binary array then annotate)
> #2 onpress - click anywhere else and it clears said annotation.
>
> Works well (probably not the best way todo this, but it works). Thing
> is it seems my onpress method is called when I click on the save on
> the toolbar
>
> I guess I should add an if statement ( if event.inaxis ...) so that
> the remove method isn't called outside of the axes area
>
>
Yup, that would do it.  Because of how you structured your try/except
statement in onpress(), the canvas is only re-drawn upon any unsuccessful
attempts of removing the text.  So, after you save, you still see the text
objects there because the canvas hasn't been redrawn.  Doing a test for
"event.inaxes" is the correct way to go there (and making sure you do the
draw at the right situation).

Cheers!
Ben Root