PhpSpreadsheet 导出 excel，图片怎么以网络图片形式导出？

求助

PhpSpreadsheet

//图片读取与存储
$draws = $sheet->getDrawingCollection();//获取所有图像
$imageFilePath = 'uploads/';
foreach ($draws as $drawing) {//$drawing 为 PhpOffice\PhpSpreadsheet\Worksheet\Drawing类的实例;
    $coordi = $drawing->getCoordinates();//获取图像坐标 eg A4
    list($startColumn, $startRow) = PhpOffice\PhpSpreadsheet\Cell\Coordinate::coordinateFromString($coordi);//拆分成 ['A','4'];
    $imageFileName = $imageFilePath.$coordi.'_'. mt_rand(1000, 9999);
    switch ($drawing->getExtension()) {
        case 'jpg':
        case 'jpeg':
            $imageFileName .= '.jpg';
            $source = imagecreatefromjpeg($drawing->getPath());
            $res = imagejpeg($source,  $imageFileName);
            break;
        case 'gif':
            $imageFileName .= '.gif';
            $source = imagecreatefromgif($drawing->getPath());
            imagegif($source,  $imageFileName);
            break;
        case 'png':
            $imageFileName .= '.png';
            $source = imagecreatefrompng($drawing->getPath());
            $res = imagepng($source, $imageFileName);
            break;
    }
}

//图像写入操作
$drawing = new \PhpOffice\PhpSpreadsheet\Worksheet\Drawing();
$drawing->setWorksheet($sheet);
$drawing->setPath(dirname(__FILE__).'/'.$imageFileName);
$drawing->setWidth(200);//图片宽
$drawing->setHeight(200);//图片高
$drawing->setOffsetX(100);//设置图片偏移量
$drawing->setCoordinates('A5');//将图片放置于单元格