wxpython面板在创建绘图后缩小

import wx

app = wx.App()
frame = wx.Frame(None, title="My App", size=(800, 600))

panel = wx.Panel(frame)

def on_paint(event):
    dc = wx.PaintDC(panel)
    dc.Clear()  # 清除绘图区域
    # 在此处添加绘图逻辑
    dc.DrawRectangle(50, 50, 200, 200)

panel.Bind(wx.EVT_PAINT, on_paint)

sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(panel, 1, wx.EXPAND)
frame.SetSizer(sizer)

frame.Show()
app.MainLoop()