Unable to display panel at the desired position - python-2.7

Question

I created a Panel in a wxFrame and then created a FigureCanvas. I would like to fit the FigureCanvas into the panel completely, but somehow the FigureCanvas does not go into the panel2_2, but exactly on just the opposite side.
Following is my code.
import wx
from numpy import arange, sin, pi
import matplotlib
matplotlib.use('WXAgg')
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
class Frame1(wx.Frame):
def __init__(self, prnt):
wx.Frame.__init__(self, parent=prnt,
pos=wx.Point(0, 0), size=wx.Size(1340, 720),
style=wx.DEFAULT_FRAME_STYLE)
self.panel2_2 = wx.Panel(parent=self,
pos=wx.Point(940, 30), size=wx.Size(400, 690),
style=wx.TAB_TRAVERSAL)
self.figure = Figure()
self.axes = self.figure.add_subplot(111)
self.canvas = FigureCanvas(self.panel2_2, -1, self.figure)
sizer = wx.BoxSizer(wx.HORIZONTAL)
sizer.Add(self.canvas, 0, wx.EXPAND)
self.panel2_2.SetSizer(sizer)
self.panel2_2.Fit()
t = arange(0.0, 3.0, 0.01)
s = sin(2 * pi * t)
self.axes.plot(t, s)
#Every wxWidgets application must have a class derived from wxApp
class MyApp(wx.App):
# wxWidgets calls this method to initialize the application
def OnInit(self):
# Create an instance of our customized Frame class
self.frame = Frame1(None)
self.SetTopWindow(self.frame)
self.frame.Show()
return True
if __name__ == '__main__':
application = MyApp(0)
application.MainLoop()
and the result
I would like to have the image on the panel2_2 ( that is on the right hand side ) and not on the left hand side

Answer 1

I think the canvas is indeed going to panel2_2. The problem in your MWE is that you do not define a sizer for panel2_2. Therefore, panel2_2 is rendered from the upper left corner of the frame. This results in panel2_2 plus the canvas showing in the left of the frame. What you see to the right of the canvas is not panel2_2 but the rest of the frame since the size of the frame is larger than the size of panel2_2. If you add a blue panel1_1 and assign another wx.BoxSizer to the frame you get the canvas showing to the right.
import wx
from numpy import arange, sin, pi
import matplotlib
matplotlib.use('WXAgg')
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
class Frame1(wx.Frame):
def __init__(self, prnt):
wx.Frame.__init__(self, parent=prnt,
pos=wx.Point(0, 0), size=wx.Size(1340, 720),
style=wx.DEFAULT_FRAME_STYLE)
self.panel1_1 = wx.Panel(parent=self, size=(400, 690))
self.panel1_1.SetBackgroundColour('blue')
self.panel2_2 = wx.Panel(parent=self,
pos=wx.Point(940, 30), size=wx.Size(400, 690),
style=wx.TAB_TRAVERSAL)
self.figure = Figure()
self.axes = self.figure.add_subplot(111)
self.canvas = FigureCanvas(self.panel2_2, -1, self.figure)
sizer = wx.BoxSizer(wx.HORIZONTAL)
sizer.Add(self.canvas, 0, wx.EXPAND)
self.panel2_2.SetSizer(sizer)
self.panel2_2.Fit()
sizerPanels = wx.BoxSizer(wx.HORIZONTAL)
sizerPanels.Add(self.panel1_1)
sizerPanels.Add(self.panel2_2)
sizerPanels.Fit(self)
self.SetSizer(sizerPanels)
t = arange(0.0, 3.0, 0.01)
s = sin(2 * pi * t)
self.axes.plot(t, s)
self.Center()
#Every wxWidgets application must have a class derived from wxApp
class MyApp(wx.App):
# wxWidgets calls this method to initialize the application
def OnInit(self):
# Create an instance of our customized Frame class
self.frame = Frame1(None)
self.SetTopWindow(self.frame)
self.frame.Show()
return True
if __name__ == '__main__':
application = MyApp(0)
application.MainLoop()