Piwik\Plugins\CoreVisualizations\Visualizations\Sparkline::getValuesFromDataTable PHP Метод

    protected function getValuesFromDataTable($dataTable)
    {
        $columns = $this->config->columns_to_display;
        $columnToPlot = false;
        if (!empty($columns)) {
            $columnToPlot = reset($columns);
            if ($columnToPlot == 'label') {
                $columnToPlot = next($columns);
            }
        }
        // a Set is returned when using the normal code path to request data from Archives, in all core plugins
        // however plugins can also return simple datatable, hence why the sparkline can accept both data types
        if ($this->dataTable instanceof DataTable\Map) {
            $values = $this->getValuesFromDataTableMap($dataTable, $columnToPlot);
        } elseif ($this->dataTable instanceof DataTable) {
            $values = $this->dataTable->getColumn($columnToPlot);
        } else {
            $values = false;
        }
        return $values;
    }