Text.php

<?php
/**
 * BaconQrCode
 *
 * @link      http://github.com/Bacon/BaconQrCode For the canonical source repository
 * @copyright 2014 Jake McGraw
 * @license   http://opensource.org/licenses/BSD-2-Clause Simplified BSD License
 */

namespace BaconQrCode\Renderer\Image\Decorator;

use BaconQrCode\Encoder\QrCode;
use BaconQrCode\Renderer\Image\RendererInterface;

/**
 * Text decorator for QR code.
 */
class Text implements DecoratorInterface
{

    const POSITION_TOP = 'top';
    const POSITION_BOTTOM = 'bottom';

    /**
     * Text to render on top of QR code
     *
     * @var string
     **/
    protected $topText;


    /**
     * Text to render on bottom of QR code
     *
     * @var string
     **/
    protected $bottomText;

    /**
     * Set text to display at a given position
     *
     * @param string $text Text string to set
     * @param string $position Where to position text on QR code
     * @return Text
     **/
    public function setText($text, $position = self::POSITION_TOP)
    {
        switch($position) {
            case self::POSITION_TOP:
                $this->topText = $text;
                break;
            case self::POSITION_BOTTOM:
                $this->bottomText = $text;
                break;
        }

        return $this;
    }

    /**
     * Get text at given position
     *
     * @param string $position Position of QR code text
     * @return Text
     **/
    public function getText($position = self::POSITION_TOP)
    {
        switch($position) {
            case self::POSITION_TOP:
                return $this->topText;
                
            case self::POSITION_BOTTOM:
                return $this->bottomText;
        }

        return null;
    }

    /**
     * preProcess(): defined by DecoratorInterface.
     *
     * @see    DecoratorInterface::preProcess()
     * @param  QrCode            $qrCode
     * @param  RendererInterface $renderer
     * @param  integer           $outputWidth
     * @param  integer           $outputHeight
     * @param  integer           $leftPadding
     * @param  integer           $topPadding
     * @param  integer           $multiple
     * @return void
     */
    public function preProcess(
        QrCode $qrCode,
        RendererInterface $renderer,
        $outputWidth,
        $outputHeight,
        $leftPadding,
        $topPadding,
        $multiple
    ) {
        // do nothing
    }

    /**
     * postProcess(): defined by DecoratorInterface.
     *
     * @see    DecoratorInterface::postProcess()
     *
     * @param  QrCode            $qrCode
     * @param  RendererInterface $renderer
     * @param  integer           $outputWidth
     * @param  integer           $outputHeight
     * @param  integer           $leftPadding
     * @param  integer           $topPadding
     * @param  integer           $multiple
     * @return void
     */
    public function postProcess(
        QrCode $qrCode,
        RendererInterface $renderer,
        $outputWidth,
        $outputHeight,
        $leftPadding,
        $topPadding,
        $multiple
    ) {
        $fontHeight = 10;
        $foregroundColor = $renderer->getForegroundColor()->getGray();

        if (!empty($this->topText)) {
        
            $newHeight = $outputHeight + $fontHeight;

            $qrCodeWithText = imagecreatetruecolor($outputWidth, $newHeight);
            imagecopyresized($qrCodeWithText, $renderer->image, 0, $fontHeight, 0, 0, $outputWidth, $newHeight, $outputWidth, $newHeight);
            $white = imagecolorallocate($qrCodeWithText, 255, 255, 255);
            imagefill($qrCodeWithText, 0, 0, $white);
            imagestring($qrCodeWithText, 3, $leftPadding, 3, $this->topText, $foregroundColor);
            $renderer->image = $qrCodeWithText;

            $outputHeight = $newHeight;
        }
        
        if (!empty($this->bottomText)) {
            
            if (strpos($this->bottomText, "\n") !== false) {

            }

            $newHeight = $outputHeight + $fontHeight + 3;

            $qrCodeWithText = imagecreatetruecolor($outputWidth, $newHeight);
            $white = imagecolorallocate($qrCodeWithText, 255, 255, 255);
            imagefill($qrCodeWithText, 0, 0, $white);
            imagecopyresized($qrCodeWithText, $renderer->image, 0, 0, 0, 0, $outputWidth, $outputHeight, $outputWidth, $outputHeight);
            imagestring($qrCodeWithText, 3, $leftPadding, $outputHeight - $fontHeight, $this->bottomText, $foregroundColor);
            $renderer->image = $qrCodeWithText;
        }
    }
}