Piwik\Plugins\VisitsSummary\Controller::getEvolutionGraph PHP Method

    public function getEvolutionGraph()
    {
        $columns = Common::getRequestVar('columns', false);
        if (false !== $columns) {
            $columns = Piwik::getArrayFromApiParameter($columns);
        }
        $documentation = $this->translator->translate('VisitsSummary_VisitsSummaryDocumentation') . '<br />' . $this->translator->translate('General_BrokenDownReportDocumentation') . '<br /><br />' . '<b>' . $this->translator->translate('General_ColumnNbVisits') . ':</b> ' . $this->translator->translate('General_ColumnNbVisitsDocumentation') . '<br />' . '<b>' . $this->translator->translate('General_ColumnNbUniqVisitors') . ':</b> ' . $this->translator->translate('General_ColumnNbUniqVisitorsDocumentation') . '<br />' . '<b>' . $this->translator->translate('General_ColumnNbActions') . ':</b> ' . $this->translator->translate('General_ColumnNbActionsDocumentation') . '<br />' . '<b>' . $this->translator->translate('General_ColumnNbUsers') . ':</b> ' . $this->translator->translate('General_ColumnNbUsersDocumentation') . ' (<a rel="noreferrer"  target="_blank" href="http://piwik.org/docs/user-id/">User ID</a>)<br />' . '<b>' . $this->translator->translate('General_ColumnActionsPerVisit') . ':</b> ' . $this->translator->translate('General_ColumnActionsPerVisitDocumentation');
        $selectableColumns = array('nb_visits', 'nb_uniq_visitors', 'nb_users', 'avg_time_on_site', 'bounce_rate', 'nb_actions_per_visit', 'max_actions', 'nb_visits_converted', 'nb_pageviews', 'nb_uniq_pageviews', 'nb_downloads', 'nb_uniq_downloads', 'nb_outlinks', 'nb_uniq_outlinks', 'avg_time_generation');
        $idSite = Common::getRequestVar('idSite');
        $displaySiteSearch = Site::isSiteSearchEnabledFor($idSite);
        if ($displaySiteSearch) {
            $selectableColumns[] = 'nb_searches';
            $selectableColumns[] = 'nb_keywords';
        }
        // $callingAction may be specified to distinguish between
        // "VisitsSummary_WidgetLastVisits" and "VisitsSummary_WidgetOverviewGraph"
        $view = $this->getLastUnitGraphAcrossPlugins($this->pluginName, __FUNCTION__, $columns, $selectableColumns, $documentation);
        if (empty($view->config->columns_to_display)) {
            $view->config->columns_to_display = array('nb_visits');
        }
        return $this->renderView($view);
    }