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<?php
/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */

/**
 * Image_Barcode_ean13 class
 *
 * Renders EAN 13 barcodes
 *
 * PHP versions 4
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to license@php.net so we can mail you a copy immediately.
 *
 * @category   Image
 * @package    Image_Barcode
 * @author     Didier Fournout <didier.fournout@nyc.fr>
 * @copyright  2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    CVS: $Id: ean13.php 304741 2010-10-25 09:14:17Z clockwerx $
 * @link       http://pear.php.net/package/Image_Barcode
 */

require_once 'Image/Barcode.php';

/**
 * Image_Barcode_ean13 class
 *
 * Package which provides a method to create EAN 13 barcode using GD library.
 *
 * @category   Image
 * @package    Image_Barcode
 * @author     Didier Fournout <didier.fournout@nyc.fr>
 * @copyright  2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    Release: @package_version@
 * @link       http://pear.php.net/package/Image_Barcode
 * @since      Image_Barcode 0.4
 */
class Image_Barcode_ean13 extends Image_Barcode
{
    /**
     * Barcode type
     * @var string
     */
    var $_type = 'ean13';

    /**
     * Barcode height
     *
     * @var integer
     */
    var $_barcodeheight = 50;

    /**
     * Font use to display text
     *
     * @var integer
     */
    var $_font = 2;  // gd internal small font

    /**
     * Bar width
     *
     * @var integer
     */
    var $_barwidth = 1;


    /**
     * Number set
     * @var array
     */
    var $_number_set = array(
           '0' => array(
                    'A' => array(0,0,0,1,1,0,1),
                    'B' => array(0,1,0,0,1,1,1),
                    'C' => array(1,1,1,0,0,1,0)
                        ),
           '1' => array(
                    'A' => array(0,0,1,1,0,0,1),
                    'B' => array(0,1,1,0,0,1,1),
                    'C' => array(1,1,0,0,1,1,0)
                        ),
           '2' => array(
                    'A' => array(0,0,1,0,0,1,1),
                    'B' => array(0,0,1,1,0,1,1),
                    'C' => array(1,1,0,1,1,0,0)
                        ),
           '3' => array(
                    'A' => array(0,1,1,1,1,0,1),
                    'B' => array(0,1,0,0,0,0,1),
                    'C' => array(1,0,0,0,0,1,0)
                        ),
           '4' => array(
                    'A' => array(0,1,0,0,0,1,1),
                    'B' => array(0,0,1,1,1,0,1),
                    'C' => array(1,0,1,1,1,0,0)
                        ),
           '5' => array(
                    'A' => array(0,1,1,0,0,0,1),
                    'B' => array(0,1,1,1,0,0,1),
                    'C' => array(1,0,0,1,1,1,0)
                        ),
           '6' => array(
                    'A' => array(0,1,0,1,1,1,1),
                    'B' => array(0,0,0,0,1,0,1),
                    'C' => array(1,0,1,0,0,0,0)
                        ),
           '7' => array(
                    'A' => array(0,1,1,1,0,1,1),
                    'B' => array(0,0,1,0,0,0,1),
                    'C' => array(1,0,0,0,1,0,0)
                        ),
           '8' => array(
                    'A' => array(0,1,1,0,1,1,1),
                    'B' => array(0,0,0,1,0,0,1),
                    'C' => array(1,0,0,1,0,0,0)
                        ),
           '9' => array(
                    'A' => array(0,0,0,1,0,1,1),
                    'B' => array(0,0,1,0,1,1,1),
                    'C' => array(1,1,1,0,1,0,0)
                        )
        );

    var $_number_set_left_coding = array(
           '0' => array('A','A','A','A','A','A'),
           '1' => array('A','A','B','A','B','B'),
           '2' => array('A','A','B','B','A','B'),
           '3' => array('A','A','B','B','B','A'),
           '4' => array('A','B','A','A','B','B'),
           '5' => array('A','B','B','A','A','B'),
           '6' => array('A','B','B','B','A','A'),
           '7' => array('A','B','A','B','A','B'),
           '8' => array('A','B','A','B','B','A'),
           '9' => array('A','B','B','A','B','A')
        );

    /**
     * Draws a EAN 13 image barcode
     *
     * @param  string $text     A text that should be in the image barcode
     * @param  string $imgtype  The image type that will be generated
     *
     * @return image            The corresponding Interleaved 2 of 5 image barcode
     *
     * @access public
     *
     * @author     Didier Fournout <didier.fournout@nyc.fr>
     * @todo       Check if $text is number and len=13
     *
     */
    function &draw($text, $imgtype = 'png')
    {
        // Calculate the barcode width
        $barcodewidth = (strlen($text)) * (7 * $this->_barwidth)
            + 3 // left
            + 5 // center
            + 3 // right
            + imagefontwidth($this->_font)+1
            ;

        $barcodelongheight = (int) (imagefontheight($this->_font)/2) + $this->_barcodeheight;

        // Create the image
        $img = ImageCreate(
                    $barcodewidth,
                    $barcodelongheight + imagefontheight($this->_font) + 1
                );

        // Alocate the black and white colors
        $black = ImageColorAllocate($img, 0, 0, 0);
        $white = ImageColorAllocate($img, 255, 255, 255);

        // Fill image with white color
        imagefill($img, 0, 0, $white);

        // get the first digit which is the key for creating the first 6 bars
        $key = substr($text,0,1);

        // Initiate x position
        $xpos = 0;

        // print first digit
        imagestring($img, $this->_font, $xpos, $this->_barcodeheight, $key, $black);
        $xpos= imagefontwidth($this->_font) + 1;

        // Draws the left guard pattern (bar-space-bar)
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;
        // space
        $xpos += $this->_barwidth;
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;

        // Draw left $text contents
        $set_array=$this->_number_set_left_coding[$key];
        for ($idx = 1; $idx < 7; $idx ++) {
            $value=substr($text,$idx,1);
            imagestring ($img, $this->_font, $xpos+1, $this->_barcodeheight, $value, $black);
            foreach ($this->_number_set[$value][$set_array[$idx-1]] as $bar) {
                if ($bar) {
                    imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $this->_barcodeheight, $black);
                }
                $xpos += $this->_barwidth;
            }
        }

        // Draws the center pattern (space-bar-space-bar-space)
        // space
        $xpos += $this->_barwidth;
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;
        // space
        $xpos += $this->_barwidth;
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;
        // space
        $xpos += $this->_barwidth;


        // Draw right $text contents
        for ($idx = 7; $idx < 13; $idx ++) {
            $value=substr($text,$idx,1);
            imagestring ($img, $this->_font, $xpos+1, $this->_barcodeheight, $value, $black);
            foreach ($this->_number_set[$value]['C'] as $bar) {
                if ($bar) {
                    imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $this->_barcodeheight, $black);
                }
                $xpos += $this->_barwidth;
            }
        }

        // Draws the right guard pattern (bar-space-bar)
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;
        // space
        $xpos += $this->_barwidth;
        // bar
        imagefilledrectangle($img, $xpos, 0, $xpos + $this->_barwidth - 1, $barcodelongheight, $black);
        $xpos += $this->_barwidth;

        return $img;
    } // function create

} // class
?>
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