Magento2 order invoice with custom footer field

invoice.php

<?php
/**
 * add this file to /var/www/html/app/code/Simeone/InvoicePdf/Pdf
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Model\Order\Pdf;

use Magento\Sales\Model\ResourceModel\Order\Invoice\Collection;

/**
 * Sales Order Invoice PDF model
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class Invoice extends AbstractPdf
{
    /**
     * @var \Magento\Store\Model\StoreManagerInterface
     */
    protected $_storeManager;

    /**
     * @var \Magento\Framework\Locale\ResolverInterface
     */
    protected $_localeResolver;

    /**
     * @param \Magento\Payment\Helper\Data $paymentData
     * @param \Magento\Framework\Stdlib\StringUtils $string
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
     * @param \Magento\Framework\Filesystem $filesystem
     * @param Config $pdfConfig
     * @param \Magento\Sales\Model\Order\Pdf\Total\Factory $pdfTotalFactory
     * @param \Magento\Sales\Model\Order\Pdf\ItemsFactory $pdfItemsFactory
     * @param \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate
     * @param \Magento\Framework\Translate\Inline\StateInterface $inlineTranslation
     * @param \Magento\Sales\Model\Order\Address\Renderer $addressRenderer
     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
     * @param \Magento\Framework\Locale\ResolverInterface $localeResolver
     * @param array $data
     *
     * @SuppressWarnings(PHPMD.ExcessiveParameterList)
     */
    public function __construct(
        \Magento\Payment\Helper\Data $paymentData,
        \Magento\Framework\Stdlib\StringUtils $string,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\Filesystem $filesystem,
        Config $pdfConfig,
        \Magento\Sales\Model\Order\Pdf\Total\Factory $pdfTotalFactory,
        \Magento\Sales\Model\Order\Pdf\ItemsFactory $pdfItemsFactory,
        \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate,
        \Magento\Framework\Translate\Inline\StateInterface $inlineTranslation,
        \Magento\Sales\Model\Order\Address\Renderer $addressRenderer,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Locale\ResolverInterface $localeResolver,
        array $data = []
    ) {
        $this->_storeManager = $storeManager;
        $this->_localeResolver = $localeResolver;
        parent::__construct(
            $paymentData,
            $string,
            $scopeConfig,
            $filesystem,
            $pdfConfig,
            $pdfTotalFactory,
            $pdfItemsFactory,
            $localeDate,
            $inlineTranslation,
            $addressRenderer,
            $data
        );
    }

    /**
     * Draw header for item table
     *
     * @param \Zend_Pdf_Page $page
     * @return void
     */
    protected function _drawHeader(\Zend_Pdf_Page $page)
    {
        /* Add table head */
        $this->_setFontRegular($page, 10);
        $page->setFillColor(new \Zend_Pdf_Color_Rgb(0.93, 0.92, 0.92));
        $page->setLineColor(new \Zend_Pdf_Color_GrayScale(0.5));
        $page->setLineWidth(0.5);
        $page->drawRectangle(25, $this->y, 570, $this->y - 15);
        $this->y -= 10;
        $page->setFillColor(new \Zend_Pdf_Color_Rgb(0, 0, 0));

        //columns headers
        $lines[0][] = ['text' => __('Products'), 'feed' => 35];

        $lines[0][] = ['text' => __('SKU'), 'feed' => 290, 'align' => 'right'];

        $lines[0][] = ['text' => __('Qty'), 'feed' => 435, 'align' => 'right'];

        $lines[0][] = ['text' => __('Price'), 'feed' => 360, 'align' => 'right'];

        $lines[0][] = ['text' => __('Tax'), 'feed' => 495, 'align' => 'right'];

        $lines[0][] = ['text' => __('Subtotal'), 'feed' => 565, 'align' => 'right'];

        $lineBlock = ['lines' => $lines, 'height' => 5];

        $this->drawLineBlocks($page, [$lineBlock], ['table_header' => true]);
        $page->setFillColor(new \Zend_Pdf_Color_GrayScale(0));
        $this->y -= 20;
    }
    /**
     * Return PDF document
     *
     * @param array|Collection $invoices
     * @return \Zend_Pdf
     */
    public function getPdf($invoices = [])
    {
        $this->_beforeGetPdf();
        $this->_initRenderer('invoice');

        $pdf = new \Zend_Pdf();
        $this->_setPdf($pdf);
        $style = new \Zend_Pdf_Style();
        $this->_setFontBold($style, 10);

        foreach ($invoices as $invoice) {
            if ($invoice->getStoreId()) {
                $this->_localeResolver->emulate($invoice->getStoreId());
                $this->_storeManager->setCurrentStore($invoice->getStoreId());
            }
            $page = $this->newPage();
            $order = $invoice->getOrder();
            /* Add image */
            $this->insertLogo($page, $invoice->getStore());
            /* Add address */
            $this->insertAddress($page, $invoice->getStore());
            /* Add head */
            $this->insertOrder(
                $page,
                $order,
                $this->_scopeConfig->isSetFlag(
                    self::XML_PATH_SALES_PDF_INVOICE_PUT_ORDER_ID,
                    \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
                    $order->getStoreId()
                )
            );
            /* Add document text and number */
            $this->insertDocumentNumber($page, __('Invoice # ') . $invoice->getIncrementId());
            /* Add table */
            $this->_drawHeader($page);
            /* Add body */
            foreach ($invoice->getAllItems() as $item) {
                if ($item->getOrderItem()->getParentItem()) {
                    continue;
                }
                /* Draw item */
                $this->_drawItem($item, $page, $order);
                $page = end($pdf->pages);
            }
            /* Add totals */
            $this->insertTotals($page, $invoice);
            if ($invoice->getStoreId()) {
                $this->_localeResolver->revert();
            }
        }
        $this->_afterGetPdf();
        return $pdf;
    }
    /* Add Your Custom Information you want to show in this function */
    protected function _drawFooter(\Zend_Pdf_Page $page)
    {
        $this->y =100;
        $page->setFillColor(new \Zend_Pdf_Color_Rgb(1, 1, 1));
        $page->setLineColor(new \Zend_Pdf_Color_GrayScale(0.5));
        $page->setLineWidth(0.5);
        $page->drawRectangle(70, $this->y, 510, $this->y -60);

        $page->setFillColor(new \Zend_Pdf_Color_Rgb(0.1, 0.1, 0.1));
        $page->setFont(\Zend_Pdf_Font::fontWithName(\Zend_Pdf_Font::FONT_HELVETICA), 7);
        $this->y -=10;
        $page->drawText("MI-NY SRL Unipersonale - Via Friuli, 3 24052 Azzano San Paolo (BG) – Italy", 180, $this->y, 'UTF-8');
        $page->drawText("Tel.: +39 035 0067511 – Fax: +39 035 0067599 - Email: direzione@mi-nycosmetics.com", 160, $this->y -= 15 , 'UTF-8');
        $page->drawText("P.IVA/C.F./Registro Imprese BG 03754540163 – REA 405442", 200, $this->y -= 15 , 'UTF-8');
        $page->drawText("Capitale Sociale € 10.000,00 i.v.", 250, $this->y -= 15 , 'UTF-8');


        //$page->drawText("Registered in Countryname", 430, $this->y, 'UTF-8');

    }
    /**
     * Create new page and assign to PDF object
     *
     * @param  array $settings
     * @return \Zend_Pdf_Page
     */
    public function newPage(array $settings = [])
    {
        /* Add new table head */
        $page = $this->_getPdf()->newPage(\Zend_Pdf_Page::SIZE_A4);
        $this->_getPdf()->pages[] = $page;
        $this->_drawFooter($page); // This line is adding information on each pages of PDF
        $this->y = 800;
        if (!empty($settings['table_header'])) {
            $this->_drawHeader($page);
        }
        return $page;
    }
}