def moveto(self, x, y, scale=1):
        """Move and scale element.

        Parameters
        ----------
        x, y : float
             displacement in x and y coordinates in user units ('px').
        scale : float
             scaling factor. To scale down scale < 1,  scale up scale > 1.
             For no scaling scale = 1.
        """
        self.root.set("transform", "translate(%s, %s) scale(%s) %s" %
                      (x, y, scale, self.root.get("transform") or ''))