PDML generated barcodes

[Nobody/Anonymous]

I took some code that was available on FPDF website and modified the PDML library to output a barcode with their tag system.

the PDML code looks something like this:

<barcode left=3% top=295px height=25 baseline="1">YOUR BARCODE DATA</barcode>

If anyone is interested, I'll post the mods.

[Nobody/Anonymous]

COOL! Just post it!

[Henri T.]

I guess this is another feature where I may be underestimating the public interest in.

It seems like there are several different standards and not-so-standards defining how to render barcodes out there.

What barcode formats are considered the most useful? (and, out of curiosity, what do you use them for?)

Thanks,
Henri

[Chris Esler]

function Code39($xpos, $ypos, $code, $baseline=0.5, $height=5){

    $wide = $baseline;
    $narrow = $baseline / 2 ;
    $gap = $narrow;

    $barChar['0'] = 'nnnwwnwnn';
    $barChar['1'] = 'wnnwnnnnw';
    $barChar['2'] = 'nnwwnnnnw';
    $barChar['3'] = 'wnwwnnnnn';
    $barChar['4'] = 'nnnwwnnnw';
    $barChar['5'] = 'wnnwwnnnn';
    $barChar['6'] = 'nnwwwnnnn';
    $barChar['7'] = 'nnnwnnwnw';
    $barChar['8'] = 'wnnwnnwnn';
    $barChar['9'] = 'nnwwnnwnn';
    $barChar['A'] = 'wnnnnwnnw';
    $barChar['B'] = 'nnwnnwnnw';
    $barChar['C'] = 'wnwnnwnnn';
    $barChar['D'] = 'nnnnwwnnw';
    $barChar['E'] = 'wnnnwwnnn';
    $barChar['F'] = 'nnwnwwnnn';
    $barChar['G'] = 'nnnnnwwnw';
    $barChar['H'] = 'wnnnnwwnn';
    $barChar['I'] = 'nnwnnwwnn';
    $barChar['J'] = 'nnnnwwwnn';
    $barChar['K'] = 'wnnnnnnww';
    $barChar['L'] = 'nnwnnnnww';
    $barChar['M'] = 'wnwnnnnwn';
    $barChar['N'] = 'nnnnwnnww';
    $barChar['O'] = 'wnnnwnnwn';
    $barChar['P'] = 'nnwnwnnwn';
    $barChar['Q'] = 'nnnnnnwww';
    $barChar['R'] = 'wnnnnnwwn';
    $barChar['S'] = 'nnwnnnwwn';
    $barChar['T'] = 'nnnnwnwwn';
    $barChar['U'] = 'wwnnnnnnw';
    $barChar['V'] = 'nwwnnnnnw';
    $barChar['W'] = 'wwwnnnnnn';
    $barChar['X'] = 'nwnnwnnnw';
    $barChar['Y'] = 'wwnnwnnnn';
    $barChar['Z'] = 'nwwnwnnnn';
    $barChar['-'] = 'nwnnnnwnw';
    $barChar['.'] = 'wwnnnnwnn';
    $barChar[' '] = 'nwwnnnwnn';
    $barChar['*'] = 'nwnnwnwnn';
    $barChar['$'] = 'nwnwnwnnn';
    $barChar['/'] = 'nwnwnnnwn';
    $barChar['+'] = 'nwnnnwnwn';
    $barChar['%'] = 'nnnwnwnwn';

    $this->SetFont('','B');
    $this->SetFont('Arial','',6);
    $this->Text($xpos, $ypos + $height + 7, strtoupper($code));
    $this->SetFillColor(0);

    $code = '*'.strtoupper($code).'*';
    for($i=0; $i<strlen($code); $i++){
        $char = $code{$i};
        if(!isset($barChar[$char])){
            $this->Error('Invalid character in barcode: '.$char);
        }
        $seq = $barChar[$char];
        for($bar=0; $bar<9; $bar++){
            if($seq{$bar} == 'n'){
                $lineWidth = $narrow;
            }else{
                $lineWidth = $wide;
            }
            if($bar % 2 == 0){
                $this->Rect($xpos, $ypos, $lineWidth, $height, 'F');
            }
            $xpos += $lineWidth;
        }
        $xpos += $gap;
    }
}

[Chris Esler]

The previous is the function ... place this inside your PDML class...

[Chris Esler]

The following is a CASE that goes inside of the
PDML::OpenTag functions

I just copied another function, so there may be residual code that is not really necessary for this case...quick and dirty...sorry about the dirty

-------------------------------------------------

case "BARCODE":
                $this->_enforceState(50,51);
                $save_x = $this->GetX();
                $x = $this->_getAttrUnit($save_x, $attr, "LEFT", $this->wPt);
                $save_y = $this->GetY();
                $y = $this->_getAttrUnit($save_y, $attr, "TOP", $this->hPt);
                $width = $this->_getAttrUnit($this->wPt-$x, $attr, "WIDTH", $this->wPt);
                // used by multicell only
                $inter = $this->_getAttrUnit($this->font_size[0], $attr, "INTER", $this->font_size[0]);
                // used by cell only.
                $height = $this->_getAttrUnit($this->font_size[0], $attr, "HEIGHT", $this->font_size[0]);
                $next = 0;
                if (isset($attr["NEXT"])) {
                    $n = strtolower($attr["NEXT"]);
                    switch ($n) {
                        case "right": $next =0; break;
                        case "bottom": case "down": $next=2; break;
                        case "break": $next = 1; break;
                    }
                }
                $style="";
                $color = "000000";
                if (isset($attr["COLOR"])) {
                    $color = $attr["COLOR"];
                    if ($color[0]=="#") { $color = substr($color,1); }
                    $style.="D";
                }
                $fillflag = 0;
                $fill = "000000";
                if (isset($attr["BASELINE"])) {
                    $baseline = $attr["BASELINE"];
                }else{
                    $baseline = "0.5";
                }
               
                $borderflag=0;
                $border = $this->_getUnit("0.2mm");
                if (isset($attr["BORDER"])) {
                    $border = $this->_getUnit($attr["BORDER"], $border);
                    $borderflag=1;
                }
                $align = ($tag=="CELL")?"L":"J";
                if (isset($attr["ALIGN"])) {
                    $al = strtolower($attr["ALIGN"]);
                    switch ($al){
                        case "left": $align="L"; break;
                        case "center": $align="C"; break;
                        case "right": $align="R"; break;
                        case "justify": $align="J"; break;
                    }
                }
                $this->_setLineColor($color);
                $this->SetLineWidth($border);
                $this->_setRectColor($fill);
                $this->SetXY($x,$y);
                //$this->cell_info = array($width, $inter, $height, $borderflag, $align, $fillflag, $next);
                $this->cell_info = array($x, $inter, $y, $height, $align, $fillflag, $baseline);
                $this->cell_text = '';
                break;

[Chris Esler]

Here is the CASE state for the the PDML::CloseTag function...

Again quick and dirty...

------------------------------------------------
case "BARCODE":
                $this->_enforceState(51,50);
                // auto-create a page if needed.
                if (!$this->inPage) {
                    $this->inPage = true;
                    $this->AddPage();
                }
               
                $this->Code39(
                    $this->cell_info[0],
                    $this->cell_info[2],
                    $this->cell_text,
                    $this->cell_info[6],
                    $this->cell_info[3]);

                break;

[Chris Esler]

As far as what I use the barcodes for...

This barcode doesn't really conform to barcode standards like EAN-18, but it outputs a barcode nonetheless.

My purposes for this is to generate a barcode for online job applications as a unique identifier for tracking.

I use PDML to generate the PDf application after the user/job-seeker has filled out the online counterpart. The barcode serves as a rendering of their session id...kind of a unique way of digital signature.

hope this helps, confuses, or whatever to whomever finds interest

[Daniele Garau]

I am interested on use it. I have try to use the screenshot of the version 1.0 but I receive an error here:

$this->_Code39(

Can you help? Thanks

[Daniele Garau]

This is the error I receive:

Fatal error: Call to undefined method PDML::Code39() in /home/ibouti29/public_html/admin/pdml/pdml.php on line 1167

[Daniele Garau]

Sorry, done it!

[Remi Frenay]

Hi Derbai, have you modified anything in the source code ? There should be no Code39 without a underscore in the source.

Regards,
Remi

[Daniele Garau]

It is possible to wrote the charters under the barcode in a bigger font? How?

Thanks, Daniele