Piwik\ViewDataTable\Manager::getGraphViewIcons PHP Method

    private static function getGraphViewIcons(ViewDataTable $view)
    {
        // add graph views
        $graphViewIcons = array('class' => 'tableGraphViews', 'buttons' => array());
        if ($view->config->show_all_views_icons) {
            if ($view->config->show_bar_chart) {
                $graphViewIcons['buttons'][] = static::getFooterIconFor(Bar::ID);
            }
            if ($view->config->show_pie_chart) {
                $graphViewIcons['buttons'][] = static::getFooterIconFor(Pie::ID);
            }
            if ($view->config->show_tag_cloud) {
                $graphViewIcons['buttons'][] = static::getFooterIconFor(Cloud::ID);
            }
        }
        return $graphViewIcons;
    }