我不知道如何刷新FigureCanvasWxAgg实例。下面是一个例子：import wx

import matplotlib

from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas

from matplotlib.figure import Figure

class MainFrame(wx.Frame):

def __init__(self):

wx.Frame.__init__(self, None, wx.NewId(), "Main")

self.sizer = wx.BoxSizer(wx.VERTICAL)

self.figure = Figure(figsize=(1,2))

self.axe = self.figure.add_subplot(111)

self.figurecanvas = FigureCanvas(self, -1, self.figure)

self.buttonPlot = wx.Button(self, wx.NewId(), "Plot")

self.buttonClear = wx.Button(self, wx.NewId(), "Clear")

self.sizer.Add(self.figurecanvas, proportion=1, border=5, flag=wx.ALL | wx.EXPAND)

self.sizer.Add(self.buttonPlot, proportion=0, border=2, flag=wx.ALL)

self.sizer.Add(self.buttonClear, proportion=0, border=2, flag=wx.ALL)

self.SetSizer(self.sizer)

self.figurecanvas.Bind(wx.EVT_LEFT_DCLICK, self.on_dclick)

self.buttonPlot.Bind(wx.EVT_BUTTON, self.on_button_plot)

self.buttonClear.Bind(wx.EVT_BUTTON, self.on_button_clear)

self.subframe_opened = False

def on_dclick(self, evt):

self.subframe = SubFrame(self, self.figure)

self.subframe.Show(True)

self.subframe_opened = True

def on_button_plot(self, evt):

self.axe.plot(range(10), color='green')

self.figurecanvas.draw()

def on_button_clear(self, evt):

if self.subframe_opened:

self.subframe.Close()

self.figure.set_canvas(self.figurecanvas)

self.axe.clear()

self.figurecanvas.draw()

class SubFrame(wx.Frame):

def __init__(self, parent, figure):

wx.Frame.__init__(self, parent, wx.NewId(), "Sub")

self.sizer = wx.BoxSizer(wx.VERTICAL)

self.figurecanvas = FigureCanvas(self, -1, figure)

self.sizer.Add(self.figurecanvas, proportion=1, border=5, flag=wx.ALL | wx.EXPAND)

self.SetSizer(self.sizer)

self.Bind(wx.EVT_CLOSE, self.on_close)

def on_close(self, evt):

self.GetParent().subframe_opened = False

evt.Skip()

class MyApp(wx.App):

def OnInit(self):

frame = MainFrame()

frame.Show(True)

self.SetTopWindow(frame)

return True

app = MyApp(0)

app.MainLoop()

我对以下操作序列感兴趣：运行脚本

调整主框架的大小

按绘图按钮

双击绘图

按清除按钮

现在我把主画面弄得一团糟。如果我调整框架大小，它会正确地重绘。我的问题是，在不调整大小的情况下，我应该在代码中添加什么？

我说的“一团糟”是指：

提前谢谢。