docs: def drawItem(self, item, painter, option):
          """
          Draws the inputed item as a bar graph.
          
          :param      item    | <XChartDatasetItem>
                      painter | <QPainter>
                      option  | <QStyleOptionGraphicsItem>
          """
          dataset = item.dataset()
          
          painter.save()
          painter.setRenderHint(painter.Antialiasing)
          
          pen = QPen(dataset.color())
          pen.setWidth(0.75)
          painter.setPen(pen)
          
          for path in item.buildData('subpaths', []):
              gradient = QLinearGradient()
              
              clr = QColor(dataset.color())
              clr.setAlpha(220)
              
              gradient.setColorAt(0.0,  clr.lighter(180))
              gradient.setColorAt(0.1,  clr.lighter(160))
              gradient.setColorAt(0.25, clr.lighter(140))
              gradient.setColorAt(1.0,  clr.lighter(125))
              
              if self.orientation() == Qt.Vertical:
                  gradient.setStart(0, path.boundingRect().bottom())
                  gradient.setFinalStop(0, path.boundingRect().top())
              else:
                  gradient.setStart(path.boundingRect().left(), 0)
                  gradient.setFinalStop(path.boundingRect().right(), 0)
              
              painter.setBrush(gradient)
              painter.drawPath(path)
          
          painter.restore()