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EAN-13 has its own class. Will probably add some Reflection Class met…
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…hods to load this object dynamically. Whole thing needs refactoring.
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rlt3 committed Oct 30, 2012
1 parent 9086aa4 commit 6ea7c5f
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31 changes: 23 additions & 8 deletions barcode.php
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Original file line number Diff line number Diff line change
@@ -1,23 +1,38 @@
<?php
//autoload
include("ean.php");

class Barcode
{
public $code;
public $type;
public $number;
public $encoding;
public $scale;

function __construct($code=null, $type='EAN-13')
protected $_encoder;

function __construct($encoding, $number=null, $scale=null)
{
$this->code = (isset($code)) ? $code : self::randomCode();
$this->number = ($number==null) ? $this->_random() : $number;
$this->scale = ($scale==null || $scale<4) ? 4 : $scale;

// Reflection Class : Method

$this->_encoder = new EAN13($this->number, $this->scale);
}

encode($this->code);
function __destruct()
{
$this->_encoder->display();
}

private static function randomCode()
private function _random()
{
return substr(number_format(time() * rand(),0,'',''),0,12);
}
}

$number = (isset($_GET['code'])) ? $_GET['code'] : null;
new Barcode($number);
$encoding = (isset($_GET['encoding'])) ? $_GET['encoding'] : 'EAN-13';
$number = (isset($_GET['code'])) ? $_GET['code'] : null;
$scale = (isset($_GET['scale'])) ? $_GET['scale'] : null;

new Barcode($encoding, $number, $scale);
257 changes: 130 additions & 127 deletions ean.php
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Original file line number Diff line number Diff line change
@@ -1,66 +1,36 @@
<?php
function encode($number)
include("ean_parity.php");

class EAN13 extends Barcode
{
$parity = array(
0 => "000000",
1 => "001011",
2 => "001101",
3 => "001110",
4 => "010011",
5 => "011001",
6 => "011100",
7 => "010101",
8 => "010110",
9 => "011010"
);

$left = array(
// Odd Encoding
0 => array (
0 => "0001101",
1 => "0011001",
2 => "0010011",
3 => "0111101",
4 => "0100011",
5 => "0110001",
6 => "0101111",
7 => "0111011",
8 => "0110111",
9 => "0001011"
),
// Even Encoding
1 => array (
0 => "0100111",
1 => "0110011",
2 => "0011011",
3 => "0100001",
4 => "0011101",
5 => "0111001",
6 => "0000101",
7 => "0010001",
8 => "0001001",
9 => "0010111"
)
);

$right = array(
0 => "1110010",
1 => "1100110",
2 => "1101100",
3 => "1000010",
4 => "1011100",
5 => "1001110",
6 => "1010000",
7 => "1000100",
8 => "1001000",
9 => "1110100"
);

$guard = array(
'start' => "101",
'middle' => "01010",
'end' => "101",
);
private $_key;
private $_checksum;
private $_bars;

private $_image;
private $_width;
private $_height;

public function __construct($number, $scale)
{
global $PARITY_KEY;

// if $number.length() < 12 || >= 13 error

// Get the parity key, which is based on the first digit.
$this->_key = $PARITY_KEY[substr($number,0,1)];

// The checksum is appended to the 12 digit string
$this->_checksum = ean_checksum($number);
$this->number = $number.$this->_checksum;

$this->scale = $scale;

$this->_bars = $this->_encode();
$this->_createImage();
$this->_drawBars();
$this->_drawText();
}

/**
* The following incantations use the parity key (based off the
Expand All @@ -72,99 +42,132 @@ function encode($number)
* third uses odd, and so on.
*/

$key = $parity[substr($number, 0, 1)];
$number .= ean_checksum($number);

$barcode[] = $guard['start'];

for($i=1;$i<=strlen($number)-1;$i++)
protected function _encode()
{
if($i<7)
$barcode[] = $left[$key[$i-1]][substr($number, $i, 1)];
else
$barcode[] = $right[substr($number, $i, 1)];
if($i==6)
$barcode[] = $guard['middle'];
}

$barcode[] = $guard['end'];
global $LEFT_PARITY, $RIGHT_PARITY, $GUARD;

$scale = 6;

$height = $scale*60;
$width = 1.8*$height;
$barcode[] = $GUARD['start'];
for($i=1;$i<=strlen($this->number)-1;$i++)
{
if($i<7)
$barcode[] = $LEFT_PARITY[$this->_key[$i-1]][substr($this->number, $i, 1)];
else
$barcode[] = $RIGHT_PARITY[substr($this->number, $i, 1)];
if($i==6)
$barcode[] = $GUARD['middle'];
}
$barcode[] = $GUARD['end'];

$image = imagecreate($width, $height);
return $barcode;
}

$bg_color=ImageColorAllocate($image, 0xFF, 0xFF, 0xFF);
$bar_color=ImageColorAllocate($image, 0x00, 0x00, 0x00);
$text_color=ImageColorAllocate($image, 0x00, 0x00, 0x00);
/**
* Create the image.
*
* The Height is 60 times the scale and the width is simply
* 180% of the height.
*/

define("MAX", $height*0.025);
define("FLOOR", $height*0.825);
define("WIDTH", $scale);
protected function _createImage()
{
$this->_height = $this->scale*60;
$this->_width = 1.8*$this->_height;

$x = ($height*0.2)-WIDTH;
$y = 100;
$this->_image = imagecreate($this->_width, $this->_height);
$bg_color=ImageColorAllocate($this->_image, 0xFF, 0xFF, 0xFF);
}

/**
* For each encoded number (a binary number, e.g. 6 => "0000101")
* draw a bar for '1', leave blank for 0;
* Draw the actual bars themselves.
*
* We have defined some constants. MAX is the y-value for the maximum
* height a bar should go. FLOOR is the y-value for the minimum height.
*
* The differences in margin for MAX and FLOOR are because most of the
* barcode doesn't extend to the bottom, only the guards do.
*
* WIDTH is the actual width of the bars.
*
* X is the starting position of the bars, which is a fifth of the way
* into the image.
*
* For the guards, draw a taller bar.
* To draw the bars, we translate a binary string into bars:
*
* 10111001 - bar, empty, bar, bar, bar, empty, empty, bar
*/

foreach($barcode as $bar)
protected function _drawBars()
{
$tall = 0;
$bar_color=ImageColorAllocate($this->_image, 0x00, 0x00, 0x00);

if(strlen($bar)==3 || strlen($bar)==5)
$tall = ($height*0.15);
define("MAX", $this->_height*0.025);
define("FLOOR", $this->_height*0.825);
define("WIDTH", $this->scale);

$x = ($this->_height*0.2)-WIDTH;

for($i=1;$i<=strlen($bar);$i++)
foreach($this->_bars as $bar)
{
if(substr($bar, $i-1, 1)==='1')
imagefilledrectangle($image, $x, MAX, $x+WIDTH, FLOOR+$tall, $bar_color);
$x += WIDTH;
$tall = 0;

if(strlen($bar)==3 || strlen($bar)==5)
$tall = ($this->_height*0.15);

for($i=1;$i<=strlen($bar);$i++)
{
if(substr($bar, $i-1, 1)==='1')
imagefilledrectangle($this->_image, $x, MAX, $x+WIDTH, FLOOR+$tall, $bar_color);
$x += WIDTH;
}
}
}

/**
* Draw the text
* Draw the text:
*
* For the 1st digit, needs to be on the left of the first guard.
* The first digit is left of the first guard. The kerning
* is how much space is in between the individual characters.
*
* Next 6 digits are in the first area. Next 6 in the next;
* We add kerning after the first character to skip over the
* first guard. Then we do it again after the 6th character
* to skip over the second guard.
*
* if $i%6 == 0, add some width
* We don't need to skip over the last guard.
*
* The fontsize is 7 times the scale.
* X is the start point, which is .05 a way into the image
*/

$x = $width*0.05;
$y = $height*0.96;
protected function _drawText()
{
$x = $this->_width*0.05;
$y = $this->_height*0.96;

$font=dirname(__FILE__)."/"."FreeSansBold.ttf";
$fontsize = $scale*(7);
$kerning = $fontsize*1;
$text_color=ImageColorAllocate($this->_image, 0x00, 0x00, 0x00);

for($i=0;$i<strlen($number);$i++)
{
imagettftext($image, $fontsize, 0, $x, $y, $text_color, $font, $number[$i]);
if($i==0 || $i==6)
$x += $kerning*0.5;
$x += $kerning;
$font=dirname(__FILE__)."/"."FreeSansBold.ttf";
$fontsize = $this->scale*(7);
$kerning = $fontsize*1;

for($i=0;$i<strlen($this->number);$i++)
{
imagettftext($this->_image, $fontsize, 0, $x, $y, $text_color, $font, $this->number[$i]);
if($i==0 || $i==6)
$x += $kerning*0.5;
$x += $kerning;
}
}

header("Content-Type: image/png; name=\"barcode.png\"");
imagepng($image);
imagedestroy($image);
}
/**
* Send the headers and display the barcode.
*
* Destroy the image afterwards because we're firing and forgetting
*/

function ean_checksum($ean){
$ean=(string)$ean;
$even=true; $esum=0; $osum=0;
for ($i=strlen($ean)-1;$i>=0;$i--){
if ($even) $esum+=$ean[$i]; else $osum+=$ean[$i];
$even=!$even;
}
return (10-((3*$esum+$osum)%10))%10;
public function display()
{
header("Content-Type: image/png; name=\"barcode.png\"");
imagepng($this->_image);
imagedestroy($this->_image);
}
}
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