plugins/CoreVisualizations/Visualizations/JqplotGraph/Bar.php

<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link    https://matomo.org
 * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */

namespace Piwik\Plugins\CoreVisualizations\Visualizations\JqplotGraph;

use Piwik\Plugins\CoreVisualizations\JqplotDataGenerator;
use Piwik\Plugins\CoreVisualizations\Visualizations\JqplotGraph;

/**
 * Visualization that renders HTML for a Bar graph using jqPlot.
 */
class Bar extends JqplotGraph
{
    public const ID = 'graphVerticalBar';
    public const FOOTER_ICON       = 'icon-chart-bar';
    public const FOOTER_ICON_TITLE = 'General_VBarGraph';

    public function beforeLoadDataTable()
    {
        parent::beforeLoadDataTable();

        $this->checkRequestIsNotForMultiplePeriods();

        $this->config->datatable_js_type = 'JqplotBarGraphDataTable';
    }

    public static function getDefaultConfig()
    {
        $config = new Config();
        $config->max_graph_elements = 6;

        return $config;
    }

    protected function ensureValidColumnsToDisplay()
    {
        parent::ensureValidColumnsToDisplay();

        $columnsToDisplay = $this->config->columns_to_display;

        // Use a sensible default if the columns_to_display is empty
        $this->config->columns_to_display = $columnsToDisplay ? : array('nb_visits');
    }

    protected function makeDataGenerator($properties)
    {
        return JqplotDataGenerator::factory('bar', $properties, $this);
    }

    public function supportsComparison()
    {
        return true;
    }
}