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

    public function getEvolutionGraph($typeReferrer = false, array $columns = array(), array $defaultColumns = array())
    {
        $view = $this->getLastUnitGraph($this->pluginName, __FUNCTION__, 'Referrers.getReferrerType');
        $view->config->add_total_row = true;
        // configure displayed columns
        if (empty($columns)) {
            $columns = Common::getRequestVar('columns', false);
            if (false !== $columns) {
                $columns = Piwik::getArrayFromApiParameter($columns);
            }
        }
        if (false !== $columns) {
            $columns = !is_array($columns) ? array($columns) : $columns;
        }
        if (!empty($columns)) {
            $view->config->columns_to_display = $columns;
        } elseif (empty($view->config->columns_to_display) && !empty($defaultColumns)) {
            $view->config->columns_to_display = $defaultColumns;
        }
        // configure selectable columns
        // todo: should use SettingsPiwik::isUniqueVisitorsEnabled
        if (Common::getRequestVar('period', false) == 'day') {
            $selectable = array('nb_visits', 'nb_uniq_visitors', 'nb_users', 'nb_actions');
        } else {
            $selectable = array('nb_visits', 'nb_actions');
        }
        $view->config->selectable_columns = $selectable;
        // configure displayed rows
        $visibleRows = Common::getRequestVar('rows', false);
        if ($visibleRows !== false) {
            // this happens when the row picker has been used
            $visibleRows = Piwik::getArrayFromApiParameter($visibleRows);
            // typeReferrer is redundant if rows are defined, so make sure it's not used
            $view->config->custom_parameters['typeReferrer'] = false;
        } else {
            // use $typeReferrer as default
            if ($typeReferrer === false) {
                $typeReferrer = Common::getRequestVar('typeReferrer', Common::REFERRER_TYPE_DIRECT_ENTRY);
            }
            $label = self::getTranslatedReferrerTypeLabel($typeReferrer);
            $total = $this->translator->translate('General_Total');
            if (!empty($view->config->rows_to_display)) {
                $visibleRows = $view->config->rows_to_display;
            } else {
                $visibleRows = array($label, $total);
            }
            $view->requestConfig->request_parameters_to_modify['rows'] = $label . ',' . $total;
        }
        $view->config->row_picker_match_rows_by = 'label';
        $view->config->rows_to_display = $visibleRows;
        $view->config->documentation = $this->translator->translate('Referrers_EvolutionDocumentation') . '<br />' . $this->translator->translate('General_BrokenDownReportDocumentation') . '<br />' . $this->translator->translate('Referrers_EvolutionDocumentationMoreInfo', '&quot;' . $this->translator->translate('Referrers_ReferrerTypes') . '&quot;');
        return $this->renderView($view);
    }