How to use the cu2qu.pens.Cu2QuPen function in cu2qu

# maxErr = 1.0, approximation error, measured in units per em (UPM).
        # postFormat = 2.0, default `post` table format.
        # reverseDirection = True, assuming the input contours' direction is correctly set (counter-clockwise), we just flip it to clockwise.
        if self.font.sfntVersion != "OTTO" or not self.font.has_key("CFF ") or not self.font.has_key("post"):
            print("WARNING: Invalid CFF-based font. --otf2ttf is now ignored.", file = sys.stderr)
            self.jobs.convert_otf2ttf = False
            return

        # Convert cubic to quadratic
        quadGlyphs = {}
        glyphOrder = self.font.getGlyphOrder()
        glyphSet = self.font.getGlyphSet()
        for glyphName in glyphSet.keys():
            glyph = glyphSet[glyphName]
            ttPen = TTGlyphPen(glyphSet)
            cu2quPen = Cu2QuPen(ttPen, maxErr, reverseDirection)
            glyph.draw(cu2quPen)
            quadGlyphs[glyphName] = ttPen.glyph()

        # Create quadratic `glyf` table
        glyf = newTable("glyf")
        glyf.glyphOrder = glyphOrder
        glyf.glyphs = quadGlyphs
        self.font["glyf"] = glyf

        # Create global instruction table `prep` with basic rendering settings
        hintProg = Program()
        hintProg.fromBytecode([184, 1, 255, 133, 184, 0, 4, 141])
        prep = newTable("prep")
        prep.program = hintProg
        self.font["prep"] = prep

def setupTable_glyf(self):
        """Make the glyf table."""

        allGlyphs = self.allGlyphs
        if self.convertCubics:
            from cu2qu.pens import Cu2QuPen
            allGlyphs = {}
            for name, glyph in self.allGlyphs.items():
                if isinstance(glyph, StubGlyph):
                    allGlyphs[name] = glyph
                    continue
                newGlyph = glyph.__class__()
                glyph.draw(Cu2QuPen(
                    newGlyph.getPen(), self.cubicConversionError,
                    reverse_direction=True))
                # the width is needed for autoUseMyMetrics method below
                newGlyph.width = glyph.width
                allGlyphs[name] = newGlyph

        self.otf["loca"] = newTable("loca")
        self.otf["glyf"] = glyf = newTable("glyf")
        glyf.glyphs = {}
        glyf.glyphOrder = self.glyphOrder

        for name in self.glyphOrder:
            glyph = allGlyphs[name]
            pen = TTGlyphPen(allGlyphs)
            glyph.draw(pen)
            ttGlyph = pen.glyph()

def setupTable_glyf(self):
        """Make the glyf table."""

        allGlyphs = self.allGlyphs
        if self.convertCubics:
            from cu2qu.pens import Cu2QuPen
            allGlyphs = {}
            for name, glyph in self.allGlyphs.items():
                if isinstance(glyph, StubGlyph):
                    allGlyphs[name] = glyph
                    continue
                newGlyph = glyph.__class__()
                glyph.draw(Cu2QuPen(
                    newGlyph.getPen(), self.cubicConversionError,
                    reverse_direction=True))
                allGlyphs[name] = newGlyph

        self.otf["loca"] = newTable("loca")
        self.otf["glyf"] = glyf = newTable("glyf")
        glyf.glyphs = {}
        glyf.glyphOrder = self.glyphOrder

        for name in self.glyphOrder:
            pen = TTGlyphPen(allGlyphs)
            allGlyphs[name].draw(pen)
            glyf[name] = pen.glyph()

def glyphs_to_quadratic(
        glyphs, max_err=MAX_ERR, reverse_direction=REVERSE_DIRECTION):
    quadGlyphs = {}
    for gname in glyphs.keys():
        glyph = glyphs[gname]
        ttPen = TTGlyphPen(glyphs)
        cu2quPen = Cu2QuPen(ttPen, max_err,
                            reverse_direction=reverse_direction)
        glyph.draw(cu2quPen)
        quadGlyphs[gname] = ttPen.glyph()
    return quadGlyphs

def glyphs_to_quadratic(
        glyphs, max_err=MAX_ERR, reverse_direction=REVERSE_DIRECTION):
    quadGlyphs = {}
    for gname in glyphs.keys():
        glyph = glyphs[gname]
        ttPen = TTGlyphPen(glyphs)
        cu2quPen = Cu2QuPen(ttPen, max_err,
                            reverse_direction=reverse_direction)
        glyph.draw(cu2quPen)
        quadGlyphs[gname] = ttPen.glyph()
    return quadGlyphs

def setupTable_glyf(self):
        """Make the glyf table."""

        allGlyphs = self.allGlyphs
        if self.convertCubics:
            from cu2qu.pens import Cu2QuPen
            allGlyphs = {}
            for name, glyph in self.allGlyphs.items():
                if isinstance(glyph, StubGlyph):
                    allGlyphs[name] = glyph
                    continue
                newGlyph = glyph.__class__()
                glyph.draw(Cu2QuPen(
                    newGlyph.getPen(), self.cubicConversionError,
                    reverse_direction=True))
                allGlyphs[name] = newGlyph

        self.otf["loca"] = newTable("loca")
        self.otf["glyf"] = glyf = newTable("glyf")
        glyf.glyphs = {}
        glyf.glyphOrder = self.glyphOrder

        for name in self.glyphOrder:
            glyph = allGlyphs[name]
            pen = TTGlyphPen(allGlyphs)
            glyph.draw(pen)
            ttGlyph = pen.glyph()
            if ttGlyph.isComposite() and self.autoUseMyMetrics:
                self.autoUseMyMetrics(ttGlyph, glyph.width, allGlyphs)