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340 lines
12 KiB
340 lines
12 KiB
<?php
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/*===========================================================================*/
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/* PHP Barcode Image Generator v1.0 [9/28/2000]
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Copyright (C)2000 by Charles J. Scheffold - cs@wsia.fm
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---
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UPDATE 09/21/2002 by Laurent NAVARRO - ln@altidev.com - http://www.altidev.com
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Updated to be compatible with register_globals = off and on
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---
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UPDATE 4/6/2001 - Important Note! This script was written with the assumption
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that "register_globals = On" is defined in your PHP.INI file! It will not
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work as-is and as described unless this is set. My PHP came with this
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enabled by default, but apparently many people have turned it off. Either
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turn it on or modify the startup code to pull the CGI variables in the old
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fashioned way (from the HTTP* arrays). If you just want to use the functions
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and pass the variables yourself, well then go on with your bad self.
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---
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This code is hereby released into the public domain.
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Use it, abuse it, just don't get caught using it for something stupid.
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The only barcode type currently supported is Code 3 of 9. Don't ask about
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adding support for others! This is a script I wrote for my own use. I do
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plan to add more types as time permits but currently I only require
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Code 3 of 9 for my purposes. Just about every scanner on the market today
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can read it.
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PARAMETERS:
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-----------
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$barcode = [required] The barcode you want to generate
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$type = (default=0) It's 0 for Code 3 of 9 (the only one supported)
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$width = (default=160) Width of image in pixels. The image MUST be wide
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enough to handle the length of the given value. The default
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value will probably be able to display about 6 digits. If you
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get an error message, make it wider!
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$height = (default=80) Height of image in pixels
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$format = (default=jpeg) Can be "jpeg", "png", or "gif"
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$quality = (default=100) For JPEG only: ranges from 0-100
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$text = (default='') 0 Enter any string to be displayed
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NOTE: You must have GD-1.8 or higher compiled into PHP
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in order to use PNG and JPEG. GIF images only work with
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GD-1.5 and lower. (http://www.boutell.com)
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ANOTHER NOTE: If you actually intend to print the barcodes
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and scan them with a scanner, I highly recommend choosing
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JPEG with a quality of 100. Most browsers can't seem to print
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a PNG without mangling it beyond recognition.
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USAGE EXAMPLES FOR ANY PLAIN OLD HTML DOCUMENT:
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-----------------------------------------------
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<IMG SRC="barcode.php?barcode=HELLO&quality=75">
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<IMG SRC="barcode.php?barcode=123456&width=320&height=200">
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*/
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/*=============================================================================*/
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//-----------------------------------------------------------------------------
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// Startup code
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//-----------------------------------------------------------------------------
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if(isset($_GET["text"])) $text=$_GET["text"];
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if(isset($_GET["format"])) $format=$_GET["format"];
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if(isset($_GET["quality"])) $quality=$_GET["quality"];
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if(isset($_GET["width"])) $width=$_GET["width"];
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if(isset($_GET["height"])) $height=$_GET["height"];
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if(isset($_GET["type"])) $type=$_GET["type"];
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if(isset($_GET["barcode"])) $barcode=$_GET["barcode"];
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if (!isset ($text)) $text = '';
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if (!isset ($type)) $type = 1;
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if (empty ($quality)) $quality = 100;
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if (empty ($width)) $width = 160;
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if (empty ($height)) $height = 80;
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if (!empty ($format)) $format = strtoupper ($format);
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else $format="PNG";
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switch ($type)
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{
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default:
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$type = 1;
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case 1:
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Barcode39 ($barcode, $width, $height, $quality, $format, $text);
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break;
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}
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//-----------------------------------------------------------------------------
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// Generate a Code 3 of 9 barcode
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//-----------------------------------------------------------------------------
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function Barcode39 ($barcode, $width, $height, $quality, $format, $text)
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{
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switch ($format)
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{
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default:
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$format = "JPEG";
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case "JPEG":
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header ("Content-type: image/jpeg");
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break;
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case "PNG":
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header ("Content-type: image/png");
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break;
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case "GIF":
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header ("Content-type: image/gif");
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break;
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}
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$im = ImageCreate ($width, $height)
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or die ("Cannot Initialize new GD image stream");
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$White = ImageColorAllocate ($im, 255, 255, 255);
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$Black = ImageColorAllocate ($im, 0, 0, 0);
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//ImageColorTransparent ($im, $White);
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ImageInterLace ($im, 1);
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$NarrowRatio = 20;
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$WideRatio = 55;
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$QuietRatio = 35;
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$nChars = (strlen($barcode)+2) * ((6 * $NarrowRatio) + (3 * $WideRatio) + ($QuietRatio));
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$Pixels = $width / $nChars;
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$NarrowBar = (int)(20 * $Pixels);
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$WideBar = (int)(55 * $Pixels);
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$QuietBar = (int)(35 * $Pixels);
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$ActualWidth = (($NarrowBar * 6) + ($WideBar*3) + $QuietBar) * (strlen ($barcode)+2);
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if (($NarrowBar == 0) || ($NarrowBar == $WideBar) || ($NarrowBar == $QuietBar) || ($WideBar == 0) || ($WideBar == $QuietBar) || ($QuietBar == 0))
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{
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ImageString ($im, 1, 0, 0, "Image is too small!", $Black);
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OutputImage ($im, $format, $quality);
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exit;
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}
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$CurrentBarX = (int)(($width - $ActualWidth) / 2);
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$Color = $White;
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$BarcodeFull = "*".strtoupper ($barcode)."*";
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settype ($BarcodeFull, "string");
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$FontNum = 3;
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$FontHeight = ImageFontHeight ($FontNum);
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$FontWidth = ImageFontWidth ($FontNum);
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if ($text != '')
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{
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$CenterLoc = (int)(($width) / 2) - (int)(($FontWidth * strlen($text)) / 2);
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ImageString ($im, $FontNum, $CenterLoc, $height-$FontHeight, "$text", $Black);
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}
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for ($i=0; $i<strlen($BarcodeFull); $i++)
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{
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$StripeCode = Code39 ($BarcodeFull[$i]);
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for ($n=0; $n < 9; $n++)
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{
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if ($Color == $White) $Color = $Black;
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else $Color = $White;
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switch ($StripeCode[$n])
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{
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case '0':
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ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$NarrowBar, $height-1-$FontHeight-2, $Color);
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$CurrentBarX += $NarrowBar;
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break;
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case '1':
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ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$WideBar, $height-1-$FontHeight-2, $Color);
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$CurrentBarX += $WideBar;
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break;
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}
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}
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$Color = $White;
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ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$QuietBar, $height-1-$FontHeight-2, $Color);
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$CurrentBarX += $QuietBar;
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}
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OutputImage ($im, $format, $quality);
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}
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//-----------------------------------------------------------------------------
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// Output an image to the browser
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//-----------------------------------------------------------------------------
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function OutputImage ($im, $format, $quality)
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{
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switch ($format)
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{
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case "JPEG":
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ImageJPEG ($im, "", $quality);
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break;
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case "PNG":
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ImagePNG ($im);
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break;
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case "GIF":
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ImageGIF ($im);
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break;
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}
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}
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//-----------------------------------------------------------------------------
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// Returns the Code 3 of 9 value for a given ASCII character
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//-----------------------------------------------------------------------------
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function Code39 ($Asc)
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{
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switch ($Asc)
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{
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case ' ':
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return "011000100";
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case '$':
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return "010101000";
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case '%':
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return "000101010";
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case '*':
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return "010010100"; // * Start/Stop
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case '+':
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return "010001010";
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case '|':
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return "010000101";
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case '.':
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return "110000100";
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case '/':
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return "010100010";
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case '0':
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return "000110100";
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case '1':
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return "100100001";
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case '2':
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return "001100001";
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case '3':
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return "101100000";
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case '4':
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return "000110001";
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case '5':
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return "100110000";
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case '6':
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return "001110000";
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case '7':
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return "000100101";
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case '8':
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return "100100100";
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case '9':
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return "001100100";
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case 'A':
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return "100001001";
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case 'B':
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return "001001001";
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case 'C':
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return "101001000";
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case 'D':
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return "000011001";
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case 'E':
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return "100011000";
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case 'F':
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return "001011000";
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case 'G':
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return "000001101";
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case 'H':
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return "100001100";
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case 'I':
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return "001001100";
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case 'J':
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return "000011100";
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case 'K':
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return "100000011";
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case 'L':
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return "001000011";
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case 'M':
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return "101000010";
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case 'N':
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return "000010011";
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case 'O':
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return "100010010";
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case 'P':
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return "001010010";
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case 'Q':
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return "000000111";
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case 'R':
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return "100000110";
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case 'S':
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return "001000110";
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case 'T':
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return "000010110";
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case 'U':
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return "110000001";
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case 'V':
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return "011000001";
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case 'W':
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return "111000000";
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case 'X':
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return "010010001";
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case 'Y':
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return "110010000";
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case 'Z':
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return "011010000";
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default:
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return "011000100";
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}
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}
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?>
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