Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Chart/Chart.php
public function render($outputDestination = null)
    {
        if ($outputDestination == 'php://output') {
            $outputDestination = null;
        }

        $libraryName = Settings::getChartRenderer();
        if ($libraryName === null) {
            return false;
        }

        // Ensure that data series values are up-to-date before we render
        $this->refresh();

        $renderer = new $libraryName($this);

        return $renderer->render($outputDestination);
    }
public function render($outputDestination = null)
    {
        if ($outputDestination == 'php://output') {
            $outputDestination = null;
        }

        $libraryName = Settings::getChartRenderer();
        if ($libraryName === null) {
            return false;
        }

        // Ensure that data series values are up-to-date before we render
        $this->refresh();

        $renderer = new $libraryName($this);

        return $renderer->render($outputDestination);
    }
Render the chart to given file (or stream).

@param string $outputDestination Name of the file render to

@return bool true on success