How to compute font size ?

Hi,

In my app, I have a window(a panel) where I write some text as an overlay :

     def _set_overlay(self, win, text, colour=(192, 192, 192)):
         dc = wx.ClientDC(win)
         odc = wx.DCOverlay(self.overlay, dc)
         odc.Clear()
         ctx = wx.GraphicsContext.Create(dc)
         col = wx.Colour(*colour, 128)
         brush = ctx.CreateBrush(wx.Brush(wx.Colour((0,0,0,128))))
         font = ctx.CreateFont(10, "ARIAL", flags=wx.FONTFLAG_DEFAULT, 
col=col)
         ctx.SetFont(font)
         ctx.DrawText(text, 10, 10, brush)
         del odc

For now, the font size is fixed. I'd like to compute the font size to 
make the text half the width of the window.
What is the best way to compute the font size ?

Regards,
Nicolas

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