Location: PHPKode > scripts > Barcode Generator > barcode-generator/class/ean8.barcode.php
<?php
if(!defined('IN_CB'))die('You are not allowed to access to this page.');

/**
 * ean8.php
 *--------------------------------------------------------------------
 *
 * Sub-Class - EAN-8
 *
 * EAN-8 contains
 *	- 4 digits
 *	- 3 digits
 *	- 1 checksum
 *
 *--------------------------------------------------------------------
 * Revision History
 * V1.00	17 jun	2004	Jean-Sebastien Goupil
 *--------------------------------------------------------------------
 * Copyright (C) Jean-Sebastien Goupil
 * http://other.lookstrike.com/barcode/
 */
class ean8 extends BarCode {
	protected $keys = array(), $code = array();
	protected $text;
	protected $textfont;

	/**
	 * Constructor
	 *
	 * @param int $maxHeight
	 * @param FColor $color1
	 * @param FColor $color2
	 * @param int $res
	 * @param string $text
	 * @param int $textfont
	 */
	public function __construct($maxHeight,FColor $color1,FColor $color2,$res,$text,$textfont) {
		BarCode::__construct($maxHeight,$color1,$color2,$res);
		$this->keys = array('0','1','2','3','4','5','6','7','8','9');
		// Left-Hand Odd Parity starting with a space
		// Right-Hand is the same of Left-Hand starting with a bar
		$this->code = array(
			'2100',	/* 0 */
			'1110',	/* 1 */
			'1011',	/* 2 */
			'0300',	/* 3 */
			'0021',	/* 4 */
			'0120',	/* 5 */
			'0003',	/* 6 */
			'0201',	/* 7 */
			'0102',	/* 8 */
			'2001'	/* 9 */
		);
		$this->setText($text);
		$this->textfont = $textfont;
	}

	/**
	 * Saves Text
	 *
	 * @param string $text
	 */
	public function setText($text) {
		$this->text = $text;
	}

	/**
	 * Draws the barcode
	 *
	 * @param ressource $im
	 */
	public function draw($im) {
		$error_stop = false;

		// Checking if all chars are allowed
		for($i=0;$i<strlen($this->text);$i++) {
			if(!is_int(array_search($this->text[$i],$this->keys))) {
				$this->DrawError($im,'Char \''.$this->text[$i].'\' not allowed.');
				$error_stop = true;
			}
		}
		if($error_stop == false) {
			// Must contains 7 chars
			if(strlen($this->text) != 7) {
				$this->DrawError($im,'Must contains 7 chars, the 8th digit is automatically added.');
				$error_stop = true;
			}
			if($error_stop == false) {
				// Calculating Checksum
				// Consider the right-most digit of the message to be in an "odd" position,
				// and assign odd/even to each character moving from right to left
				// Odd Position = 3, Even Position = 1
				// Multiply it by the number
				// Add all of that and do 10-(?mod10)
				$odd = true;
				$checksum=0;
				for($i=strlen($this->text);$i>0;$i--) {
					if($odd==true) {
						$multiplier=3;
						$odd=false;
					}
					else {
						$multiplier=1;
						$odd=true;
					}
					$checksum += $this->keys[$this->text[$i - 1]] * $multiplier;
				}
				$checksum = 10 - $checksum % 10;
				$checksum = ($checksum == 10)?0:$checksum;
				$this->text .= $this->keys[$checksum];
				// Starting Code
				$this->DrawChar($im,'000',1);
				// Draw First 4 Chars (Left-Hand)
				for($i=0;$i<4;$i++)
					$this->DrawChar($im,$this->findCode($this->text[$i]),2);
				// Draw Center Guard Bar
				$this->DrawChar($im,'00000',2);
				// Draw Last 4 Chars (Right-Hand)
				for($i=4;$i<8;$i++)
					$this->DrawChar($im,$this->findCode($this->text[$i]),1);
				// Draw Right Guard Bar
				$this->DrawChar($im,'000',1);
				$this->lastX = $this->positionX;
				$this->lastY = $this->maxHeight;
				$this->DrawText($im);
			}
		}
	}

	/**
	 * Overloaded method for drawing special label
	 *
	 * @param ressource $im
	 */
	protected function DrawText($im) {
		if($this->textfont != 0) {
			$bar_color = (is_null($this->color1))?NULL:$this->color1->allocate($im);
			if(!is_null($bar_color)) {
				$rememberX = $this->positionX;
				$rememberH = $this->maxHeight;
				// We increase the bars
				$this->maxHeight = $this->maxHeight + 9;
				$this->positionX = 0;
				$this->DrawSingleBar($im,$this->color1);
				$this->positionX += $this->res*2;
				$this->DrawSingleBar($im,$this->color1);
				// Center Guard Bar
				$this->positionX += $this->res*30;
				$this->DrawSingleBar($im,$this->color1);
				$this->positionX += $this->res*2;
				$this->DrawSingleBar($im,$this->color1);
				// Last Bars
				$this->positionX += $this->res*30;
				$this->DrawSingleBar($im,$this->color1);
				$this->positionX += $this->res*2;
				$this->DrawSingleBar($im,$this->color1);

				$this->positionX = $rememberX;
				$this->maxHeight = $rememberH;
				imagestring($im,$this->textfont,(3*$this->res+34*$this->res)/2-imagefontwidth($this->textfont)*(4/2),$this->maxHeight+1,substr($this->text,0,4),$bar_color);
				imagestring($im,$this->textfont,32*$this->res+(3*$this->res+32*$this->res)/2-imagefontwidth($this->textfont)*(4/2),$this->maxHeight+1,substr($this->text,4,4),$bar_color);
			}
			$this->lastY = $this->maxHeight + imagefontheight($this->textfont);
		}
	}
};
?>
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