Ploting in a wxFrame, How to pass an argument?

Question

As example, consider the code in http://matplotlib.org/examples/user_interfaces/embedding_in_wx4.html . But, supose that I need to pass the amplitude as argument, how can I do that? if a modify the App class declaration like

class App(wx.App):
    def __init__(self,amplitude):
        wx.App.__init__(self)
        self.arg=amplitude
    def OnInit(self):
        '''Create the main window and insert the custom frame'''
        frame = CanvasFrame(self.arg)
        frame.Show(True)

        return True

and if I modify the CanvasFrame.__init_ _() to acept an argument this doesn't work.

Thanks for your help!

Answer 1

I do not understand why argument passing to CanvasFrame should not work. The linked mpl wx4 demo was modified as follows and it worked: EDIT II: Your error was swapping wx.App.__init__(self) and self.args = amplitude. In your case self.args was not set yet when App.OnInit(…) gets called.

class CanvasFrame(wx.Frame):    
    def __init__(self, amplitude):
        wx.Frame.__init__(self, None, -1, …
        …
        self.amplitude = amplitude
        …
        # now use the amplitude
        s = sin(2*pi*t) * self.amplitude

In derived App:

class App(wx.App):
    def __init__(self, amplitude):
        self.amplitude = amplitude
        wx.App.__init__(self)

    def OnInit(self):
        'Create the main window and insert the custom frame'
        frame = CanvasFrame(self.amplitude)
        frame.Show(True)

        return True

amplitude = 16
app = App(amplitude)
app.MainLoop()

Probably it is not a good idea to have a CanvasFrame and App which cannot be initialised as a wx.Frame anymore (parent and title hardcoded into object), but this is another story.

EDIT: extended example to fully meet OP's question (argument passing from the top level inward.)