Comments on: matplotlib with wxPython GUIs

By: Ron Adelman

Ron Adelman — Tue, 30 Sep 2008 13:34:54 +0000

Exactly what I was looking for. I have graphs in my application, but not on figurecanvas. I was just trying to get a barchart with wx and was headed down the wrong track. Snippits will save me some time. Thanks

By: eliben

eliben — Fri, 19 Sep 2008 06:18:02 +0000

Evert,
Thanks. I’ve updated the file to reflect this fix.

By: Evert

Evert — Mon, 15 Sep 2008 15:42:40 +0000

Eli, for your (and possibly other people’s) records: I now know what caused this.
wxStaticBox/Sizer needs to be created before any of the controls inside it are created, otherwise it’ll draw on top of those of controls, and while you may be able to see them, you cannot “reach” (click) them. MS Windows (XP) is apparently a bit more forgiving there, so it worked for you (or it’s actually broken there, as I don’t know what’s the correct way to do this); apparently, with GTK it can even crash.

So, the solution is to take the following two lines in the BoundControlBox’s __init__() method (wx_mpl_dynamic_graph.py), and move them up, just before the self.radio_auto is created:

        self.value = initval

        box = wx.StaticBox(self, -1, label)
        sizer = wx.StaticBoxSizer(box, wx.VERTICAL)

        self.radio_auto = wx.RadioButton(self, -1,
            label="Auto", style=wx.RB_GROUP)

Then it works splendidly for me, and probably also on other platforms/window environments.
More details at the wxwidgets.org wiki or eg this post in a mailinglist.

By: Evert

Evert — Wed, 10 Sep 2008 19:08:18 +0000

Tried with a up-to-date version (2.8.8.1) of wxPython; no luck.
So I guess it’s more intrinsic to OS X/Aqua or so.
If I ever find out, I might come back here to let you know; but that could be a few months (no hurry getting this right, as I don’t need it yet. I’m just playing around right now).

By: eliben

eliben — Wed, 10 Sep 2008 14:40:49 +0000

Evert,

Your version of wxPython does look a bit old…
Though I don’t know much about OS X

By: Evert

Evert — Wed, 10 Sep 2008 11:54:41 +0000

Eli, looks great! I was just Googling around for wxPython & matplotlib coming across these examples; great starting points.
One thing: when trying on my Mac, the second example didn’t fully work: the radio buttons weren’t available, and I saw only one run of the live data. Could that be because of the wxPython version that ships with OS X 10.5? It’s 2.8.4.0, matplotlib is 0.98.0. Or is it just intrinsic to the OS X GUI?

By: Chris

Chris — Tue, 12 Aug 2008 22:25:45 +0000

Sorry - was using latest marked stable on Gentoo 0.91.2 - update to matplotlib-0.98.1 fixed it.

Afaik the problem was between those two lines of draw_plot. Once you updated x - and before you updated y - the two didn’t match. Obviously now matplotlib handle it safely.

Thanks

By: eliben

eliben — Tue, 12 Aug 2008 17:38:18 +0000

Chris,
Are you sure you didn’t change anything and / or have the up-to-date version of matplotlib ?

The only two places in the code that populate the plot with data are:

1. In the end of init_plot()

        self.plot_data = self.axes.plot(
            self.data,
            linewidth=1,
            color=(1, 1, 0),
            )[0]

This only fills in the y axis, x will be automatically done by axes.plot

2. In the end of draw_plot()

        self.plot_data.set_xdata(np.arange(len(self.data)))
        self.plot_data.set_ydata(np.array(self.data))

These two obviously create arrays of the same length.

By: Chris

Chris — Tue, 12 Aug 2008 14:35:39 +0000

Live graph one failed with :
RuntimeError: xdata and ydata must be the same length

By: Brett_McS

Brett_McS — Tue, 05 Aug 2008 21:46:24 +0000

Fantastic. I’ve been using matplotlib for a while, and have done a bit of wxPython, but have never put the two together. This should get me started. Many thanks.