Draw a character from a ttf font using fonttools / pen.

draw_ttf_character.py

import wx
from fontTools.pens.wxPen import WxPen
from fontTools.ttLib import TTFont


class MyFrame(wx.Frame):
    def __init__(self, ttfont: TTFont):
        wx.Frame.__init__(self, None, -1, "Font painter")
        self.font = ttfont
        self.Bind(wx.EVT_PAINT, self.on_paint)

    def on_paint(self, evt):
        evt.Skip()
        height = self.GetSize()[1]
        units_per_em = self.font['head'].unitsPerEm
        scale = height / 4 / units_per_em


        dc = wx.PaintDC(self)
        gc = wx.GraphicsContext.Create(dc)

        glyph = self.font.getGlyphSet()['A']
        pen = WxPen(self.font.getGlyphSet())
        glyph.draw(pen)

        m = gc.CreateMatrix()
        # Move to the vertical centre of the window
        m.Translate(0, height // 2)
        # Flip the y axis
        m.Scale(scale, -scale)
        pen.path.Transform(m)

        gc.SetBrush(wx.BLACK_BRUSH)
        gc.FillPath(pen.path)


def show_ui(font):
    app = wx.App()
    frame = MyFrame(font)
    frame.Show()
    frame.Maximize(True)
    app.MainLoop()

if "__main__" == __name__:
    show_ui(TTFont("Roboto-Regular.ttf"))