ean13.php

<?php

class EAN13render
{
	// These are the different barcode patterns for each digit (7 bit each).
	// '1' represents a black line, '0' represents white (no line).
	static $Rcodes = array('1110010', '1100110', '1101100', '1000010', '1011100',
						             '1001110', '1010000', '1000100', '1001000', '1110100');

	// The EAN13 defines three groups of bit patterns.
	// The 'R' pattern group, as above.
	// The 'G' group, which is a mirror of R (bits scanned in opposite order).
	// And the 'L' group, which is an inverse of R (0 becomes 1, 1 becomes 0).
	// Rather than defining them as arrays, we'll synthesize them at runtime.
	
	// This array describes which group to use for each digit,
	// depending on the first digit of the EAN code.
	static $groups = array('LLLLLL', 'LLGLGG', 'LLGGLG', 'LLGGGL', 'LGLLGG',
						             'LGGLLG', 'LGGGLL', 'LGLGLG', 'LGLGGL', 'LGGLGL');

	public static function Render($barcode) {
		$w = 123; $h = 78; // Size of our barcode image
		$im = ImageCreateTrueColor($w, $h);
		ImageFilledRectangle($im, 0,0, $w,$h, 0xFFFFFF); // Fill the image with white.
		$xpos = 19;
		
		// This function renders bit patterns
		$synth = function($pattern, $transformation, $height) use(&$im, &$xpos) {
			$b = strlen($pattern);
			for($a=0; $a<$b; $a++){
				$index = $a;
				
				// If the group is 'G', mirror the code.
				if($transformation == 'G') $index = ($b-1) - $index;
				
				// Choose the bit from the pattern.
				$bit = (int) $pattern[$index];
				
				// If the group is 'L', invert the bit.
				if($transformation == 'L') $bit = 1-$bit;
				
				// If the bit is '1', draw a vertical line in black color.
				if($bit == 1)
					ImageLine($im, $xpos,0, $xpos,$height, 0x000000);

				$xpos++;
			}
		};
		
		// Define the lengths of the barcode lines.
		$normal_height    = $h-12;
		$separator_height = $h-7;
		
		$font = 'arial.ttf';
		
		// First, produce a begin separator (two thin bars).
		$synth('101', 'R', $separator_height);
		
		for($n=0; $n<13; $n++) {
			$digit = (int) $barcode[$n];
			
			if($n == 0) {
				// Print the first digit separately (in black color)
				// Unless 0, which stands for UPC
				if($digit != 0)
					ImageTTFtext($im, 8,0, $xpos-10,$h-1, 0x000000, $font, $digit);
			} else {
				// Print the digit (in black color)
				ImageTTFtext($im, 8,0, $xpos,$h-1, 0x000000, $font, $digit);

				// Produce the pattern.
				$code   = EAN13render::$Rcodes[$digit];
				$select = 'R';
				if($n <= 6) {
					// Choose the pattern for the left side digits based
					// on the first digit of the barcode.
					$select = EAN13render::$groups[ (int)$barcode[0] ][ $n-1 ];
				}
				
				$synth($code, $select, $normal_height);
				
				if($n == 6) {
					// Produce the middle separator. Two thin bars, again.
					$synth('01010', 'R', $separator_height);
				}
			}
		}
		
		// Last, produce the end separator.
		// Which looks the same as the begin separator.
		$synth('101', 'R', $separator_height);
		
		return $im;
	}
};

// This is my sample EAN-13 barcode (6425081281317)
$barcode = sprintf('64%s', base_convert('BISQWIT', 36, 10));
$im = EAN13render::Render($barcode);
ImagePNG($im, 'test.png');

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