def down(self, h, cr=True):
        """moves current vertical position h mm down
        cr True will navigate to the left margin
        """
        if cr:
            self.oPdf.ln(h=0)
        self.oPdf.set_y(self.oPdf.get_y() + h)
def down ( self , h , cr = True ) : if cr : self . oPdf . ln ( h = 0 ) self . oPdf . set_y ( self . oPdf . get_y ( ) + h )
moves current vertical position h mm down
        cr True will navigate to the left margin