WxPython面板内matplotlib图形的事件处理

如何在笔记本或类似示例中的matplotlib图形上执行事件处理

from numpy import arange, sin, 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.figure = Figure()
        self.axes = self.figure.add_subplot(111)
        self.canvas = FigureCanvas(self, -1, self.figure)
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
        self.SetSizer(self.sizer)
        self.Fit()

    def draw(self):
    t = arange(0.0, 3.0, 0.01)
    s = sin(2 * pi * t)
    self.axes.plot(t, s)


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

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已尝试此self.canvas.mpl_connect'pick_event'，onpick，但显示一个错误，即：必须首先创建wx.App对象

我不清楚您将引发错误的代码放在何处。使用onpick def和self.canvas.mpl_connect'pick_event'，onpick在CanvasPanel类中