Returns the value within the chart for the given point.
        
        :param      point | <QPoint>
        
        :return     {<str> axis name: <variant> value, ..}

def valueAt(self, point):
        """
        Returns the value within the chart for the given point.
        
        :param      point | <QPoint>
        
        :return     {<str> axis name: <variant> value, ..}
        """
        chart_point = self.uiChartVIEW.mapFromParent(point)
        scene_point = self.uiChartVIEW.mapToScene(chart_point)
        return self.renderer().valueAt(self.axes(), scene_point)