def needle(self, serie):
        """Draw a needle for each value"""
        serie_node = self.svg.serie(serie)
        for i, theta in enumerate(serie.values):
            if theta is None:
                continue

            def point(x, y):
                return '%f %f' % self.view((x, y))

            val = self._format(serie, i)
            metadata = serie.metadata.get(i)
            gauges = decorate(
                self.svg, self.svg.node(serie_node['plot'], class_="dots"),
                metadata
            )

            tolerance = 1.15

            if theta < self._min:
                theta = self._min * tolerance

            if theta > self._max:
                theta = self._max * tolerance

            w = (self._box._tmax - self._box._tmin + self.view.aperture) / 4

            if self.logarithmic:
                w = min(w, self._min - self._min * 10**-10)

            alter(
                self.svg.node(
                    gauges,
                    'path',
                    d='M %s L %s A %s 1 0 1 %s Z' % (
                        point(.85, theta),
                        point(self.needle_width, theta - w),
                        '%f %f' % (self.needle_width, self.needle_width),
                        point(self.needle_width, theta + w),
                    ),
                    class_='line reactive tooltip-trigger'
                ), metadata
            )

            x, y = self.view((.75, theta))
            self._tooltip_data(gauges, val, x, y, xlabel=self._get_x_label(i))
            self._static_value(serie_node, val, x, y, metadata)
Draw a needle for each value