Re: [Matplotlib-users] Axes3d.mouse_init(), facing problems when embedding matplotlib 3d-projection

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 422-6466

Here is a proof of concept (yes, it uses qt4... my work computer doesn't
have qt5, but that should be a straight-forward modification to make). Note
the complete lack of any call to mouse_init() and the complete lack of any
use of pyplot (in fact, I commented it out to make the point that you
shouldn't use pyplot *at all* when doing this sort of embedding).

```
import numpy as np
#import matplotlib.pyplot as plt
import sys
from matplotlib.backends.qt4_compat import QtGui, QtCore
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas

from mpl_toolkits.mplot3d import Axes3D

if __name__ == '__main__':
    # Must come before any Qt widgets are made
    app = QtGui.QApplication(sys.argv)
    win = QtGui.QMainWindow()
    fig = Figure()
    canvas = FigureCanvas(fig)
    ax = fig.add_subplot(1, 1, 1, projection='3d')

    xs = np.random.rand(25)
    ys = np.random.rand(25)
    zs = np.random.rand(25)
    ax.scatter(xs, ys, zs)

    win.resize(int(fig.bbox.width), int(fig.bbox.height))
    win.setWindowTitle("Embedding with Qt")
    # Needed for keyboard events
    canvas.setFocusPolicy(QtCore.Qt.StrongFocus)
    canvas.setFocus()
    win.setCentralWidget(canvas)
    win.show()
    sys.exit(app.exec_())
```

I hope this helps!
Ben Root

On Wed, Apr 29, 2015 at 5:38 AM, Christian Ambros <am...@ym...> wrote:

> Ok, back from revision...
>
> The is no mix-up for the show command. The only explicit show() command is
> commented out in line 41. It can be deleted. But I haven't done that, yet.
> There are several bits of code which are remains of the design process
> since this is work in progress. Code cleaning will be done when the main
> functionality is in place.
>
> Back to addmpl where I embedded gui elements into the canvas. Taking out
> the matplotlib taskbar doesn't change a thing as I wrote earlier, but to
> make sure it doesn't bother the mainloop, it should be commented out. I may
> not put it back in, because I don't see the point in needing it. It was
> just to see if it's possible.
>
> >>But option 2 relinquishes that control to the developer's GUI app. You
> *cannot* use pyplot for option 2, which is what you are doing.
>
> Is that so? In line 116 I create the canvas, which is derived from
> matplotlib's backend's FigureCanvasQTAgg and given to the QWidget at line
> 119. That's the only part where both interact with each other. the rest is
> handle by matplotlib.
>
> The error message says that Axes3D.figure.canvas is 'None' and that's why
> mouse rotation is disabled.
> It's None because there is no content at that point, when it's passed to
> the QWidget. It's filled with content in line 38. So if matplotlib disables
> the mouse rotation by default, when the canvas is empty how do I prevent
> this disabling by default?
> If I can't, at what point do I have to pass the filled canvas to the
> QWidget? How does that impact the GUI itself?
> If I can't enable the mouse rotation by hand and I just can pass filled
> canvas around, do I have to build a work around with initialize it with an
> empty 2D canvas and replace it later with the filled 3D canvas? How's the
> mouse rotation activated then?
>
> In general, I wouldn't have to enable the rotation if it wouldn't be
> switch off for an empty canvas.
>
> I'm going to consult your book, now, for different ways of coping with
> such things...
>
> cheers,
> Christian
>
> --
> "A little learning never caused anyone's head to explode!"
>
>
> "Ein wenig Lernen hat noch niemandens Kopf zum Explodieren gebracht!"
>
>
>
>   On Tuesday, April 28, 2015 8:28 PM, Benjamin Root <ben...@ou...>
> wrote:
>
>
> One thing I see off the bat is your addmpl() method:
>
> ```
>     def addmpl(self, fig):
>         #FigureCanvas.__init__(self, fig)
>         self.canvas = FigureCanvas(fig)
>
>         Axes3D.mouse_init(self, rotate_btn=1, zoom_btn=2)
>         self.mplvl.addWidget(self.canvas)
>         self.canvas.draw()
>         self.toolbar = NavigationToolbar(self.canvas, self.mplwindow,
> coordinates=True)
>         self.mplvl.addWidget(self.toolbar)
> ```
>
> You are calling Axes3D.mouse_init() on the Main object (that is `self`).
> That is completely wrong. It can only be called for the 3d axes objects.
>
> Also, what I see happening here is some mixing up of how to do embedding.
> There are two approaches to embedding. 1) you can embedded GUI elements
> into your canvas widget, or 2) you can embed your canvas widget into your
> GUI app. The important distinction between the two is who controls the
> mainloop. In option 1 (and in matplotlib in general), pyplot will create
> the GUI app for you automatically (it is completely transparent to you) and
> kicks it off upon call to show(). But option 2 relinquishes that control to
> the developer's GUI app. You *cannot* use pyplot for option 2, which is
> what you are doing. Rip out all of the pyplot stuff, and instantiate the
> Qt5 Figure object directly, and then obtain the axes objects from the
> figure object via calls to add_subplot(). You shouldn't even need to do the
> whole mouse_init() stuff.
>
> I now think this has nothing to do with Qt Designer. While I don't
> specifically cover qt5 in my book, I do make all of these distinctions very
> clear in chapter 5 of my book "Interactive Applications using Matplotlib".
>
> Cheers!
> Ben Root
>
>
> On Tue, Apr 28, 2015 at 4:03 PM, Christian Ambros <am...@ym...>
> wrote:
>
> Hi Benjamin,
>
> I would do that if my task were my private stuff, but in this case it's
> work-related and my boss wants me to use the designer and he already set a
> deadline, which, I already knew, is set to tight. I told him before, that
> it would be just a try but he sold it to his boss after some pressure. You
> know how the bosses' bosses are, they don't get the idea that innovation
> can't be dictated. They don't understand the concept that software is
> written and doesn't come into existence out of nothing.
>
> Without PyQt5 it's working fine. I got the plots and they are gorgeous,
> but that doesn't help when presenting to the bosses. If I just would know
> how to activate the 3d-draw's mouse action again, by hand, than it has to
> last just some moments for the presentation, afterwards I have the time to
> examine and find a more robust solution.
>
> Thanks for the effort.
> cheers,
> Christian
>
> --
> "A little learning never caused anyone's head to explode!"
>
>
> "Ein wenig Lernen hat noch niemandens Kopf zum Explodieren gebracht!"
>
>
>
>   On Tuesday, April 28, 2015 7:30 PM, Benjamin Root <ben...@ou...>
> wrote:
>
>
> I think there is something wrong with the embedding code rather than there
> being an actual bug. I have embedded mplot3d stuff before (admittedly, not
> in qt5) with no problems. I haven't had the time yet to examine your code
> to see what the potential issue is, though. I have also never used Qt
> designer, so I have no clue if there is something that it is doing that
> might be making things difficult.
>
> I already know that the code you originally posted has errors in it. I
> would suggest first making a prototype without Qt Designer as a
> proof-of-concept, perhaps starting with one of our examples in the gallery?
>
> Ben Root
>
>
> On Tue, Apr 28, 2015 at 2:12 PM, Christian Ambros <am...@ym...>
> wrote:
>
>  Since there seems to be no progress with this issue, may I assume there
> isn't any interest in it?
> I took a further look around in the internet but couldn't any solution.
> It leads to an other question: How many users of matplotlib are using
> 3d-plots anyway? It we are just a few and there won't be anyone who wants
> to embed it in PyQt5, than I can understand that this issue doesn't concern
> no-one and I have to look somewhere else to find a 3d-plotting lib which is
> embedable.
>
> cheers,
> Christain
> --
> "A little learning never caused anyone's head to explode!"
>
>
> "Ein wenig Lernen hat noch niemandens Kopf zum Explodieren gebracht!"
>
>
>
>   On Tuesday, April 21, 2015 1:44 PM, Benjamin Root <ben...@ou...>
> wrote:
>
>
> The addmpl() method isn't right. You created a canvas object, assigned it
> to self.canvas, but then tried to call FigureCanvas.__init__(), passing it
> whatever object "self" is. What class is addmpl() a part of? What does it
> subclass?
>
> On Tue, Apr 21, 2015 at 7:24 AM, Christian Ambros <am...@ym...>
> wrote:
>
> Hi,
>
> I embedded Ryan's examble for PyQt5-matplotlib use into my App but I get
> the following error:
>
> /usr/local/lib/python3.4/dist-packages/mpl_toolkits/mplot3d/axes3d.py:1009:
> UserWarning: Axes3D.figure.canvas is 'None', mouse rotation disabled.  Set
> canvas then call Axes3D.mouse_init().
>   warnings.warn('Axes3D.figure.canvas is \'None\', mouse rotation
> disabled.  Set canvas then call Axes3D.mouse_init().')
>
> From Stackoverflow, which host to question about this, I know that mouse
> actions are disabled when the canvas is re-initialized by whatever.
>
> The only position I do such an operation is in here:
>
>
>
>
>
>
>
> *def addmpl(self, fig):        self.canvas = FigureCanvas(fig)
> #FigureCanvas.__init__(self, fig)        #Axes3D.mouse_init(self)
> self.mplvl.addWidget(self.canvas)        self.canvas.draw()
> self.toolbar = NavigationToolbar(self.canvas, self.mplwindow,
> coordinates=True)        self.mplvl.addWidget(self.toolbar)*
>
> On of the Stackoverflow suggestion says, that re initializing FigureCanvas
> should do the trick but I'll get:
>
> Traceback (most recent call last):
>   File "./ex_0.1.py", line 145, in <module>
>     main(sys.argv)
>   File "./ex_0.1.py", line 53, in main
>     mainwindow.addmpl(fig1)
>   File "./ex_0.1.py", line 116, in addmpl
>     FigureCanvas.__init__(self, fig)
>   File
> "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_qt5agg.py",
> line 181, in __init__
>     FigureCanvasQT.__init__(self, figure)
>   File
> "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_qt5.py",
> line 237, in __init__
>     super(FigureCanvasQT, self).__init__(figure=figure)
> TypeError: super(type, obj): obj must be an instance or subtype of type
>
> as follow-up error message.
>
> just using *Axes3D.mouse_init()* , as suggested by matplotlib itself,
> leads to:
>
> Traceback (most recent call last):
>   File "./ex_0.1.py", line 146, in <module>
>     main(sys.argv)
>   File "./ex_0.1.py", line 53, in main
>     mainwindow.addmpl(fig1)
>   File "./ex_0.1.py", line 118, in addmpl
>     Axes3D.mouse_init()
> TypeError: mouse_init() missing 1 required positional argument: 'self'
>
> adding self leads to:
>
> Traceback (most recent call last):
>   File "./ex_0.1.py", line 146, in <module>
>     main(sys.argv)
>   File "./ex_0.1.py", line 53, in main
>     mainwindow.addmpl(fig1)
>   File "./ex_0.1.py", line 118, in addmpl
>     Axes3D.mouse_init(self)
>   File
> "/usr/local/lib/python3.4/dist-packages/mpl_toolkits/mplot3d/axes3d.py",
> line 1002, in mouse_init
>     canv = self.figure.canvas
> AttributeError: 'Main' object has no attribute 'figure'
> ./ex_0.1.py &
>
> Maybe I'm adding those lines at the wrong place, but I could fined
> anything useful in the matplotlib documantation, that would help me out,
> either.
>
> Any thougts that might help?
>
> Cheers,
> Christian
>
> --
> "A little learning never caused anyone's head to explode!"
>
>
> "Ein wenig Lernen hat noch niemandens Kopf zum Explodieren gebracht!"
>
>
> ------------------------------------------------------------------------------
> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> Develop your own process in accordance with the BPMN 2 standard
> Learn Process modeling best practices with Bonita BPM through live
> exercises
> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual-
> event?utm_
> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>
>
>
> ------------------------------------------------------------------------------
> One dashboard for servers and applications across Physical-Virtual-Cloud
> Widest out-of-the-box monitoring support with 50+ applications
> Performance metrics, stats and reports that give you Actionable Insights
> Deep dive visibility with transaction tracing using APM Insight.
> http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>
>
>
>
>

Re: [Matplotlib-users] Axes3d.mouse_init(), facing problems when embedding matplotlib 3d-projection

Re: [Matplotlib-users] Axes3d.mouse_init(), facing problems when embedding matplotlib 3d-projection into PyQt5 App