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perkiset
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« on: January 11, 2010, 07:05:17 PM » |
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Here is a little class I put together to generate bar codes on the fly. It is reasonably well tested, but not thoroughly. It does a bit of work to try to protect you from doing something stupid (like output with an unsupported format) but again, not a lot. These barcodes should be readable by any standard barcode scanner. It is quite simple. Create an instance of the class (either supplying the initial geometry of the barcode or letting the class set defaults) then build a code, passing the text, optionally showing the text value at the base of the code and optionally to a file or streamed directly out. Options- mode: Output file type. GIF, PNG, JPEG, WBMP. Default is GIF.
- bcThinWidth: the pixel width of the thin line in the code. Default is 2px.
- bcThickWidth: multiple of thin line for thick lines. Default is 3.
- bcHeight: overall height of the output image. Default is 50px
- bcFontSize: stock GD font size. Default is 2 (about a 12px)
- showText: Display the input text in a small white box, centered at the bottom of the image. Default is false
- fileName: If this parameter is passed, then the output of the function will be into a file. Otherwise (default) it will be streamed directly back out to the browser.
Here are a couple examples with the Show Text option set on:    Enjoy! <?php
$bc = new barCode();
$bc->build('hello world');
class barCode
{
public $bcHeight, $bcThinWidth, $bcThickWidth, $bcFontSize, $mode;
function __construct($mode='gif', $height=50, $thin=2, $thick=3, $fSize=2)
{
$this->bcHeight = $height;
$this->bcThinWidth = $thin;
$this->bcThickWidth = $this->bcThinWidth * $thick;
$this->fontSize = $fSize;
$this->mode = $mode;
$this->outMode = array('gif'=>'gif', 'png'=>'png', 'jpeg'=>'jpeg', 'wbmp'=>'vnd.wap.wbmp');
$this->codeMap = array(
'0'=>'000110100', '1'=>'100100001', '2'=>'001100001', '3'=>'101100000',
'4'=>'000110001', '5'=>'100110000', '6'=>'001110000', '7'=>'000100101',
'8'=>'100100100', '9'=>'001100100', 'A'=>'100001001', 'B'=>'001001001',
'C'=>'101001000', 'D'=>'000011001', 'E'=>'100011000', 'F'=>'001011000',
'G'=>'000001101', 'H'=>'100001100', 'I'=>'001001100', 'J'=>'000011100',
'K'=>'100000011', 'L'=>'001000011', 'M'=>'101000010', 'N'=>'000010011',
'O'=>'100010010', 'P'=>'001010010', 'Q'=>'000000111', 'R'=>'100000110',
'S'=>'001000110', 'T'=>'000010110', 'U'=>'110000001', 'V'=>'011000001',
'W'=>'111000000', 'X'=>'010010001', 'Y'=>'110010000', 'Z'=>'011010000',
' '=>'011000100', '$'=>'010101000', '%'=>'000101010', '*'=>'010010100',
'+'=>'010001010', '-'=>'010000101', '.'=>'110000100', '/'=>'010100010'
);
}
public function build($text='', $showText=false, $fileName=null)
{
if (trim($text) <= ' ')
throw new exception('barCode::build - must be passed text to operate');
if (!$fileType = $this->outMode[$this->mode])
throw new exception("barCode::build - unrecognized output format ({$this->mode})");
if (!function_exists("image{$this->mode}"))
throw new exception("barCode::build - unsupported output format ({$this->mode} - check phpinfo)");
$text = strtoupper($text);
$dispText = "* $text *";
$text = "*$text*"; // adds start and stop chars
$textLen = strlen($text);
$barcodeWidth = $textLen * (7 * $this->bcThinWidth + 3 * $this->bcThickWidth) - $this->bcThinWidth;
$im = imagecreate($barcodeWidth, $this->bcHeight);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
imagefill($im, 0, 0, $white);
$xpos = 0;
for ($idx=0; $idx<$textLen; $idx++)
{
if (!$char = $text[$idx]) $char = '-';
for ($ptr=0; $ptr<=8; $ptr++)
{
$elementWidth = ($this->codeMap[$char][$ptr]) ? $this->bcThickWidth : $this->bcThinWidth;
if (($ptr + 1) % 2)
imagefilledrectangle($im, $xpos, 0, $xpos + $elementWidth-1, $this->bcHeight, $black);
$xpos += $elementWidth;
}
$xpos += $this->bcThinWidth;
}
if ($showText)
{
$pxWid = imagefontwidth($this->fontSize) * strlen($dispText) + 10;
$pxHt = imagefontheight($this->fontSize) + 2;
$bigCenter = $barcodeWidth / 2;
$textCenter = $pxWid / 2;
imagefilledrectangle($im, $bigCenter - $textCenter, $this->bcHeight - $pxHt, $bigCenter + $textCenter, $this->bcHeight, $white);
imagestring($im, $this->fontSize, ($bigCenter - $textCenter) + 5, ($this->bcHeight - $pxHt) + 1, $dispText, $black);
}
if (!$fileName) header("Content-type: image/{$fileType}");
switch($this->mode)
{
case 'gif': imagegif($im, $fileName);
case 'png': imagepng($im, $fileName);
case 'jpeg': imagejpeg($im, $fileName);
case 'wbmp': imagewbmp($im, $fileName);
}
imagedestroy($im);
}
}
?>
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