/carempleadolist/barcode/BCGean8.barcode.php

<?php

/**

 *--------------------------------------------------------------------

 *

 * Sub-Class - EAN-8

 *

 * EAN-8 contains

 *	- 4 digits

 *	- 3 digits

 *	- 1 checksum

 *

 * The checksum is always displayed.

 *

 *--------------------------------------------------------------------

 * Copyright (C) Jean-Sebastien Goupil

 * http://www.barcodephp.com

 */

include_once('BCGBarcode1D.php');



class BCGean8 extends BCGBarcode1D {

	protected $labelLeft = null;

	protected $labelRight = null;



	/**

	 * Constructor.

	 */

	public function __construct() {

		parent::__construct();



		$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 */

		);

	}



	/**

	 * Draws the barcode.

	 *

	 * @param resource $im

	 */

	public function draw($im) {

		$c = strlen($this->text);

		

		// Checksum

		$this->calculateChecksum();

		$temp_text = $this->text . $this->keys[$this->checksumValue];

		

		// Starting Code

		$this->drawChar($im, '000', true);

		

		// Draw First 4 Chars (Left-Hand)

		for ($i = 0; $i < 4; $i++) {

			$this->drawChar($im, $this->findCode($temp_text[$i]), false);

		}

		

		// Draw Center Guard Bar

		$this->drawChar($im, '00000', false);

		

		// Draw Last 4 Chars (Right-Hand)

		for ($i = 4; $i < 8; $i++) {

			$this->drawChar($im, $this->findCode($temp_text[$i]), true);

		}



		// Draw Right Guard Bar

		$this->drawChar($im, '000', true);

		$this->drawText($im, 0, 0, $this->positionX, $this->thickness);



		if ($this->isDefaultEanLabelEnabled()) {

			$dimension = $this->labelRight->getDimension();

			$this->drawExtendedBars($im, $dimension[1] - 2);

		}

	}



	/**

	 * Returns the maximal size of a barcode.

	 *

	 * @param int $w

	 * @param int $h

	 * @return int[]

	 */

	public function getDimension($w, $h) {

		$startlength = 3;

		$centerlength = 5;

		$textlength = 8 * 7;

		$endlength = 3;



		$w += $startlength + $centerlength + $textlength + $endlength;

		$h += $this->thickness;

		return parent::getDimension($w, $h);

	}



	/**

	 * Adds the default label.

	 */

	protected function addDefaultLabel() {

		if ($this->isDefaultEanLabelEnabled()) {

			$this->processChecksum();

			$label = $this->getLabel();

			$font = $this->font;



			$this->labelLeft = new BCGLabel(substr($label, 0, 4), $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);

			$labelLeftDimension = $this->labelLeft->getDimension();

			$this->labelLeft->setOffset(($this->scale * 30 - $labelLeftDimension[0]) / 2 + $this->scale * 2);



			$this->labelRight = new BCGLabel(substr($label, 4, 3) . $this->keys[$this->checksumValue], $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);

			$labelRightDimension = $this->labelRight->getDimension();

			$this->labelRight->setOffset(($this->scale * 30 - $labelRightDimension[0]) / 2 + $this->scale * 34);



			$this->addLabel($this->labelLeft);

			$this->addLabel($this->labelRight);

		}

	}



	/**

	 * Checks if the default ean label is enabled.

	 *

	 * @return bool

	 */

	protected function isDefaultEanLabelEnabled() {

		$label = $this->getLabel();

		$font = $this->font;

		return $label !== null && $label !== '' && $font !== null && $this->defaultLabel !== null;

	}



	/**

	 * Validates the input.

	 */

	protected function validate() {

		$c = strlen($this->text);

		if ($c === 0) {

			throw new BCGParseException('ean8', 'No data has been entered.');

		}



		// Checking if all chars are allowed

		for ($i = 0; $i < $c; $i++) {

			if (array_search($this->text[$i], $this->keys) === false) {

				throw new BCGParseException('ean8', 'The character \'' . $this->text[$i] . '\' is not allowed.');

			}

		}



		// If we have 8 chars just flush the last one

		if ($c === 8) {

			$this->text = substr($this->text, 0, 7);

		} elseif ($c !== 7) {

			throw new BCGParseException('ean8', 'Must contain 7 digits, the 8th digit is automatically added.');

		}



		parent::validate();

	}



	/**

	 * Overloaded method to calculate checksum.

	 */

	protected function calculateChecksum() {

		// 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;

		$this->checksumValue = 0;

		$c = strlen($this->text);

		for ($i = $c; $i > 0; $i--) {

			if ($odd === true) {

				$multiplier = 3;

				$odd = false;

			} else {

				$multiplier = 1;

				$odd = true;

			}

	

			if (!isset($this->keys[$this->text[$i - 1]])) {

				return;

			}



			$this->checksumValue += $this->keys[$this->text[$i - 1]] * $multiplier;

		}



		$this->checksumValue = (10 - $this->checksumValue % 10) % 10;

	}



	/**

	 * Overloaded method to display the checksum.

	 */

	protected function processChecksum() {

		if ($this->checksumValue === false) { // Calculate the checksum only once

			$this->calculateChecksum();

		}



		if ($this->checksumValue !== false) {

			return $this->keys[$this->checksumValue];

		}



		return false;

	}



	/**

	 * Draws the extended bars on the image.

	 *

	 * @param resource $im

	 * @param int $plus

	 */

	private function drawExtendedBars($im, $plus) {

		$rememberX = $this->positionX;

		$rememberH = $this->thickness;



		// We increase the bars

		$this->thickness = $this->thickness + intval($plus / $this->scale);

		$this->positionX = 0;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		$this->positionX += 2;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		$code1 = $this->positionX;



		// Center Guard Bar

		$this->positionX += 30;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		$this->positionX += 2;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);



		// Last Bars

		$this->positionX += 30;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		$this->positionX += 2;

		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);



		$this->positionX = $rememberX;

		$this->thickness = $rememberH;

	}

}

?>