how to refresh embedded matplotlib figure?

wxPython Users
1

Hi, I want to embed matplotlib in wxpython. But I met a problem.

In the following simplified code, I want to switch between sin(x) and cos(x) curve on clicking the button. However, my code refuse to draw sin(x). What is the point?

and other question, I want the gui shows both the curve and the button, but now only curve is displayed. I have to resize the window if I want to see the button. Any hints?

thanks

Lee

from numpy import arange, sin, cos, pi
import matplotlib
matplotlib.use('WXAgg')

from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
#~ from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure

import wx

class CanvasPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
        self.btn=wx.Button(self, -1, 'sin(x)')
        self.figure = Figure()
        self.axes = self.figure.add_subplot(111)
        self.axes.hold(False)
        self.canvas = FigureCanvas(self, -1, self.figure)
        self.sizer = wx.FlexGridSizer(1, 2, 0, 0)
        self.sizer.Add(self.canvas, 0, wx.LEFT | wx.TOP | wx.GROW)
        self.sizer.Add(self.btn, 1, wx.LEFT | wx.TOP)
        self.sizer.AddGrowableRow(0)
        self.sizer.AddGrowableCol(0)
        self.sizer.AddGrowableCol(1)
        self.SetSizer(self.sizer)
        self.Fit()

        self.Bind(wx.EVT_BUTTON, self.evtBtn, self.btn)

    def evtBtn(self, evt):
        x=arange(0, pi*2, 0.1)
        s, c=sin(x), cos(x)
        if self.btn.GetLabel()=='sin(x)':
            self.btn.SetLabel('cos(x)')
            self.axes.plot(x, c)
        else:
            self.btn.SetLabel('sin(x)')
            self.axes.plot(x, s)

if __name__ == "__main__":
    app = wx.PySimpleApp()
    fr = wx.Frame(None, title='test')
    panel = CanvasPanel(fr)
    panel.evtBtn(None)
    fr.Show()
    app.MainLoop()
2

Oyster wrote:

Hi, I want to embed matplotlib in wxpython. But I met a problem.

In the following simplified code, I want to switch between sin(x) and
cos(x) curve on clicking the button. However, my code refuse to draw
sin(x). What is the point?

You need to call self.canvas.draw() after you change the attributes of
the plot. It doesn't automatically redraw after every property change.

and other question, I want the gui shows both the curve and the
button, but now only curve is displayed. I have to resize the window
if I want to see the button. Any hints?

The issue here seems to be that the matplot canvas has a minimum size.
The size isn't known at the time you create the sizer, and it's not
adjusting later. There must be some combination of Fit and Layout that
could make this work, but I couldn't figure it out in 5 minutes.

ยทยทยท

--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.