i25 barcodes

Add-On i25 barcodes

Informations

Author: Matthias Lau
License: FPDF

Description

This script implements Interleaved 2 of 5 barcodes. An Interleaved 2 of 5 barcode contains digits (0 to 9) and encodes the data in the width of both bars and spaces. It is used primarily in the distribution and warehouse industry.

i25(float xpos, float ypos, string code [, float basewidth [, float height]])

xpos: abscissa of barcode
ypos: ordinate of barcode
code: value of barcode
basewidth: corresponds to the width of a wide bar (defaults to 1)
height: bar height (defaults to 10)

Note: if the length of the code is not even, a 0 is preprended.

Source

<?php
require('fpdf.php');

// based on the Code 39 script from The-eh
class PDF_i25 extends FPDF
{
function i25($xpos, $ypos, $code, $basewidth=1, $height=10){

    $wide = $basewidth;
    $narrow = $basewidth / 3 ;

    // wide/narrow codes for the digits
    $barChar['0'] = 'nnwwn';
    $barChar['1'] = 'wnnnw';
    $barChar['2'] = 'nwnnw';
    $barChar['3'] = 'wwnnn';
    $barChar['4'] = 'nnwnw';
    $barChar['5'] = 'wnwnn';
    $barChar['6'] = 'nwwnn';
    $barChar['7'] = 'nnnww';
    $barChar['8'] = 'wnnwn';
    $barChar['9'] = 'nwnwn';
    $barChar['A'] = 'nn';
    $barChar['Z'] = 'wn';

    // add leading zero if code-length is odd
    if(strlen($code) % 2 != 0){
        $code = '0' . $code;
    }

    $this->SetFont('Arial', '', 10);
    $this->Text($xpos, $ypos + $height + 4, $code);
    $this->SetFillColor(0);

    // add start and stop codes
    $code = 'AA'.strtolower($code).'ZA';

    for($i=0; $i<strlen($code); $i=$i+2){
        // choose next pair of digits
        $charBar = $code[$i];
        $charSpace = $code[$i+1];
        // check whether it is a valid digit
        if(!isset($barChar[$charBar])){
            $this->Error('Invalid character in barcode: '.$charBar);
        }
        if(!isset($barChar[$charSpace])){
            $this->Error('Invalid character in barcode: '.$charSpace);
        }
        // create a wide/narrow-sequence (first digit=bars, second digit=spaces)
        $seq = '';
        for($s=0; $s<strlen($barChar[$charBar]); $s++){
            $seq .= $barChar[$charBar][$s] . $barChar[$charSpace][$s];
        }
        for($bar=0; $bar<strlen($seq); $bar++){
            // set lineWidth depending on value
            if($seq[$bar] == 'n'){
                $lineWidth = $narrow;
            }else{
                $lineWidth = $wide;
            }
            // draw every second value, because the second digit of the pair is represented by the spaces
            if($bar % 2 == 0){
                $this->Rect($xpos, $ypos, $lineWidth, $height, 'F');
            }
            $xpos += $lineWidth;
        }
    }
}
}

?>

Example

<?php
require('i25.php');

$pdf = new PDF_i25();
$pdf->AddPage();
$pdf->i25(90, 40, '12345678');
$pdf->Output();
?>

View the result here.

Download

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