How to use the orange3.Orange.widgets.visualize.owboxplot.FilterGraphicsRectItem function in Orange3

return QGraphicsLineItem(x0 * scale_x, y0, x1 * scale_x, y1, *args)

        scale_x = self.scale_x
        box = []
        whisker1 = line(stat.a_min, -1.5, stat.a_min, 1.5)
        whisker2 = line(stat.a_max, -1.5, stat.a_max, 1.5)
        vert_line = line(stat.a_min, 0, stat.a_max, 0)
        mean_line = line(stat.mean, -height / 3, stat.mean, height / 3)
        for it in (whisker1, whisker2, mean_line):
            it.setPen(self._pen_paramet)
        vert_line.setPen(self._pen_dotted)
        var_line = line(stat.mean - stat.dev, 0, stat.mean + stat.dev, 0)
        var_line.setPen(self._pen_paramet)
        box.extend([whisker1, whisker2, vert_line, mean_line, var_line])
        if stat.q25 is not None and stat.q75 is not None:
            mbox = FilterGraphicsRectItem(
                stat.conditions,
                stat.q25 * scale_x,
                -height / 2,
                (stat.q75 - stat.q25) * scale_x,
                height,
            )
            mbox.setBrush(self._box_brush)
            mbox.setPen(QPen(Qt.NoPen))
            mbox.setZValue(-200)
            box.append(mbox)

        if stat.median is not None:
            median_line = line(stat.median, -height / 2, stat.median, height / 2)
            median_line.setPen(self._pen_median)
            median_line.setZValue(-150)
            box.append(median_line)

def strudel(self, dist, group_val_index=None):
        attr = self.attribute
        ss = np.sum(dist)
        box = []
        if ss < 1e-6:
            cond = [FilterDiscrete(attr, None)]
            if group_val_index is not None:
                cond.append(FilterDiscrete(self.group_var, [group_val_index]))
            box.append(FilterGraphicsRectItem(cond, 0, -10, 1, 10))
        cum = 0
        for i, v in enumerate(dist):
            if v < 1e-6:
                continue
            if self.stretched:
                v /= ss
            v *= self.scale_x
            cond = [FilterDiscrete(attr, [i])]
            if group_val_index is not None:
                cond.append(FilterDiscrete(self.group_var, [group_val_index]))
            rect = FilterGraphicsRectItem(cond, cum + 1, -6, v - 2, 12)
            rect.setBrush(QBrush(QColor(*attr.colors[i])))
            rect.setPen(QPen(Qt.NoPen))
            if self.stretched:
                tooltip = "{}: {:.2f}%".format(
                    attr.values[i], 100 * dist[i] / sum(dist)

if ss < 1e-6:
            cond = [FilterDiscrete(attr, None)]
            if group_val_index is not None:
                cond.append(FilterDiscrete(self.group_var, [group_val_index]))
            box.append(FilterGraphicsRectItem(cond, 0, -10, 1, 10))
        cum = 0
        for i, v in enumerate(dist):
            if v < 1e-6:
                continue
            if self.stretched:
                v /= ss
            v *= self.scale_x
            cond = [FilterDiscrete(attr, [i])]
            if group_val_index is not None:
                cond.append(FilterDiscrete(self.group_var, [group_val_index]))
            rect = FilterGraphicsRectItem(cond, cum + 1, -6, v - 2, 12)
            rect.setBrush(QBrush(QColor(*attr.colors[i])))
            rect.setPen(QPen(Qt.NoPen))
            if self.stretched:
                tooltip = "{}: {:.2f}%".format(
                    attr.values[i], 100 * dist[i] / sum(dist)
                )
            else:
                tooltip = "{}: {}".format(attr.values[i], int(dist[i]))
            rect.setToolTip(tooltip)
            text = QGraphicsTextItem(attr.values[i])
            box.append(rect)
            box.append(text)
            cum += v
        return box