trying to Copy plot from one MplWidget canvas to another

Community matplotlib-users
1

Hey folks,
my problem may be obvious, but i can’t seem to copy a plot from one canvas to another.

I have this object where whichCanvas is an instance of MplWidget (code shown below)

   **self.whichCanvas**.canvas.ax.plot(xData, yData, 'bo', linewidth=1.5, linestyle='-')

I want to copy the plot and axes to another MplWidget object

  **self.anotherCanvas**.canvas

I’ve tried:
self.anotherCanvas.canvas**.**ax = self.whichCanvas.canvas.ax
self.anotherCanvas.canvas.draw()
and
self.anotherCanvas.canvas = self.whichCanvas.canvas
self.anotherCanvas.canvas.draw()
the plot doesn’t seem to copy. Does any body more familiar with matplotlib have any suggestions?
This is the MplWidget Class
***************************** MplWidget *******************************
from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg
import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
class MplCanvas(FigureCanvas):
def init(self):
self.fig = Figure()
self.ax = self.fig.add_subplot(111)
FigureCanvas.init(self, self.fig)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)

class MplWidget(QtGui.QWidget):

def __init__(self, parent = None):
    QtGui.QWidget.__init__(self, parent)
    self.canvas = MplCanvas()
    self.vbl = QtGui.QVBoxLayout()
    self.vbl.addWidget(self.canvas)
    self.setLayout(self.vbl)

Regards,
Dave Tung

cell: 925-321-6657
office: 510-353-4770
dave.m.tung@…2966…

2

Copying a matplotlib canvas (or a figure, or an axes) is not easy. You
cannot just rebind it. You need to copy all the hierarchy of
underlying artists. Also the attributes of artists need to be adjusted
accordingly.
And best option in my opinion is just to create another canvas using
the code that created the original canvas.

Regards,

-JJ

···

On Mon, Feb 8, 2010 at 3:04 PM, <Dave.M.Tung@...2966...> wrote:

Hey folks,

my problem may be obvious, but i can't seem to copy a plot from one canvas
to another.

# I have this object where whichCanvas is an instance of MplWidget (code
shown below)

self.whichCanvas.canvas.ax.plot(xData, yData, 'bo', linewidth=1.5,
linestyle='-')

# I want to copy the plot and axes to another MplWidget object

self.anotherCanvas.canvas

I've tried:

self.anotherCanvas.canvas.ax = self.whichCanvas.canvas.ax
self.anotherCanvas.canvas.draw()

and

self.anotherCanvas.canvas = self.whichCanvas.canvas
self.anotherCanvas.canvas.draw()

the plot doesn't seem to copy. Does any body more familiar with matplotlib
have any suggestions?

This is the MplWidget Class
***************************** MplWidget *******************************

from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg \
import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):
def __init__(self):
self.fig = Figure()
self.ax = self.fig.add_subplot(111)
FigureCanvas.__init__(self, self.fig)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)

class MplWidget(QtGui.QWidget):

def __init__(self, parent = None):
QtGui.QWidget.__init__(self, parent)
self.canvas = MplCanvas()
self.vbl = QtGui.QVBoxLayout()
self.vbl.addWidget(self.canvas)
self.setLayout(self.vbl)

Regards,
Dave Tung

cell: 925-321-6657
office: 510-353-4770
dave.m.tung@...2966...

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