Re: [Matplotlib-users] assigning a plot object to a figure

[Emmanuel M. <ema...@ya...>]

After trying hard to send a plot to my widget, I finally found a solution that works: get the figure from the widget!
In short, it is has simple as:


from pyqtgraph.Qt import QtGui, QtCore
import matplotlib
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar
from matplotlib.figure import Figure

class MatplotlibWidget(QtGui.QWidget):
    """
    Implements a Matplotlib figure inside a QWidget.
    Use getFigure() and redraw() to interact with matplotlib.

    Example::

        mw = MatplotlibWidget()
        subplot = mw.getFigure().add_subplot(111)
        subplot.plot(x,y)
        mw.draw()
    """

    def __init__(self, size=(5.0, 4.0), dpi=100):
        QtGui.QWidget.__init__(self)
        self.fig = Figure(size, dpi=dpi)
        self.canvas = FigureCanvas(self.fig)
        self.canvas.setParent(self)
        self.toolbar = NavigationToolbar(self.canvas, self)

        self.vbox = QtGui.QVBoxLayout()
        self.vbox.addWidget(self.toolbar)
        self.vbox.addWidget(self.canvas)

        self.setLayout(self.vbox)

    def getFigure(self):
        return self.fig

    def draw(self):
        self.canvas.draw()


A special thanks to the pyqtgraph maintainer
http://luke.campagnola.me/code/pyqtgraph/


________________________________
 From: Emmanuel Mayssat <ema...@ya...>
To: Emmanuel Mayssat <ema...@ya...>; Eric Firing <ef...@ha...>; "mat...@li..." <mat...@li...> 
Sent: Tuesday, April 3, 2012 4:36 PM
Subject: Re: [Matplotlib-users] assigning a plot object to a figure
 

Although this work, I lose the position of the axes.
How can I reposition the axes2 which was at 221 in fig2, to 221 in fig1 ?




________________________________
 From: Emmanuel Mayssat <ema...@ya...>
To: Eric Firing <ef...@ha...>; "mat...@li..." <mat...@li...> 
Sent: Monday, April 2, 2012 3:20 PM
Subject: Re: [Matplotlib-users] assigning a plot object to a figure
 

Well, not sure if that is supported, but I found a way !:
        [...]

        self.fig1 = Figure(figsize=(width, height), dpi=dpi)
        self.fig2 = Figure(figsize=(width, height), dpi=dpi)
        self.axes1 = self.fig1.add_subplot(223)
        self.axes2 = self.fig2.add_subplot(221)

        [...]
        self.axes2.plot([0,1])
(1)     self.axes2.set_figure(self.fig1)
(2)     self.fig1.add_axes(self.axes2)

Note that (1) and (2) are required in that order!
From the code above, if I show the fig1, then I see axes1 and axes2 on the figure....


Summary:
I created the axes2 independently of fig1

PS: I want to use my axes2 as an object to sent to my Qt widget (a blank figure/canvas)

--
Emmanuel


________________________________
 From: Eric Firing <ef...@ha...>
To: mat...@li... 
Sent: Sunday, April 1, 2012 1:36 PM
Subject: Re: [Matplotlib-users] assigning a plot object to a figure
 
On 03/30/2012 01:23 PM, Emmanuel Mayssat wrote:
> Hello all,
>
> I can create a figure
> and get the corresponding axes/plots
>
> for examples:
> 1/
> fig = Figure(figsize=(width, height), dpi=dpi)
> ax = gif.add_subplot(111)
>
> 2/
> fig, ax = plt.subplots()
>
> but I would like to create my plot independently from the figure and
> assign it to a figure
>
> I code I would like to do something like this
>
> my_ax = Axes(...)
> my_ax.plot(x,y)
>
>
> ax = my_ax
>
> or
>
> my_ax.set_figure(fig)
>
> How can I create the axes/plot object independently from the figure?

As far as I can see, you can't.  The figure is deeply embedded in the 
Axes object; that's why the figure is an argument in Axes.__init__().

> Better yet, how can I assign an axe to a
 figure?

I don't think you can.  It looks to me like Axes.set_figure should be 
clearly marked as a private method, not to be used except in 
Axes.__init__().

Short of a major refactoring of mpl, I think you will need to find some 
other way of accomplishing your ultimate aim.

Eric

> --
> Emmanuel

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