How to use the gaphas.freehand.FreeHandPainter function in gaphas

def update_painters(self, view):
        sloppiness = self.properties.get("diagram.sloppiness", 0)

        if sloppiness:
            view.painter = FreeHandPainter(ItemPainter(), sloppiness)
            view.bounding_box_painter = FreeHandPainter(
                BoundingBoxPainter(), sloppiness
            )
        else:
            view.painter = ItemPainter()

def update_painters(self, view):
        sloppiness = self.properties.get("diagram.sloppiness", 0)

        if sloppiness:
            view.painter = FreeHandPainter(ItemPainter(), sloppiness)
            view.bounding_box_painter = FreeHandPainter(
                BoundingBoxPainter(), sloppiness
            )
        else:
            view.painter = ItemPainter()

def set_drawing_style(self, sloppiness=0.0):
        """
        Set the drawing style for the diagram. 0.0 is straight,
        2.0 is very sloppy.  If the sloppiness is set to be anything
        greater than 0.0, the FreeHandPainter instances will be used
        for both the item painter and the box painter.  Otherwise, by
        default, the ItemPainter is used for the item and
        BoundingBoxPainter for the box.
        """
        assert self.view
        view = self.view

        if sloppiness:
            item_painter = FreeHandPainter(ItemPainter(), sloppiness=sloppiness)
            box_painter = FreeHandPainter(BoundingBoxPainter(), sloppiness=sloppiness)
        else:
            item_painter = ItemPainter()
            box_painter = BoundingBoxPainter()

        view.painter = (
            PainterChain()
            .append(item_painter)
            .append(HandlePainter())
            .append(FocusedItemPainter())
            .append(ToolPainter())
        )

        view.bounding_box_painter = box_painter

        view.queue_draw_refresh()