Hello,
I have recently started to explore the wxPython opportunities to generate
small graphics. As a very first example, I wrote the following:
import wx
#____________________________

class MainWindow(wx.Frame):
    def __init__(self,parent,id,title):
        wx.Frame.__init__(self,parent,-1, title,
style=wx.DEFAULT_FRAME_STYLE)
        self.panel = wx.Panel(self,-1)
        self.sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.sizer.Add(self.panel,1,wx.ALL)
        self.SetSize(wx.Size(400,400))
        self.SetSizer(self.sizer)
        self.SetAutoLayout(True)
        self.sizer.Fit(self)
        dc = wx.ClientDC(self.panel)
        dc.BeginDrawing()
        dc.SetPen(wx.Pen(wx.RED,20))
        dc.DrawLine(5,200,50,300)
        dc.EndDrawing()
        self.Refresh()


app = wx.PySimpleApp()
frame = MainWindow(None, -1, "Draw Demo")
frame.Show(True)
app.MainLoop()

But I cannot see the expected line. What have I missed?
Many thanks in advance for your help
Peter

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