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<?php
/**
* BCGean8.barcode.php
*--------------------------------------------------------------------
*
* Sub-Class - EAN-8
*
* EAN-8 contains
* - 4 digits
* - 3 digits
* - 1 checksum
*
* The checksum is always displayed.
*
*--------------------------------------------------------------------
* Revision History
* v2.0.1 8 mar 2009 Jean-Sébastien Goupil Fix padding for the barcode
* v2.0.0 23 apr 2008 Jean-Sébastien Goupil New Version Update
* v1.2.3 6 feb 2006 Jean-Sébastien Goupil Fix label position
* v1.2.3b 31 dec 2005 Jean-Sébastien Goupil Checksum separated + PHP5.1 compatible
* v1.2.2 23 jul 2005 Jean-Sébastien Goupil Enhance rapidity
* v1.2.1 27 jun 2005 Jean-Sébastien Goupil Font support added
* V1.00 17 jun 2004 Jean-Sebastien Goupil
*--------------------------------------------------------------------
* $Id: BCGean8.barcode.php,v 1.12 2009/03/23 06:48:30 jsgoupil Exp $
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGBarcode1D.php');
class BCGean8 extends BCGBarcode1D {
/**
* 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) {
$error_stop = false;
// Checking if all chars are allowed
$c = strlen($this->text);
for($i = 0; $i < $c; $i++) {
if(array_search($this->text[$i], $this->keys) === false) {
$this->drawError($im, 'Char \'' . $this->text[$i] . '\' not allowed.');
$error_stop = true;
}
}
if($error_stop === false) {
// Must contain 7 chars
if($c !== 7) {
$this->drawError($im, 'Must contain 7 chars, the 8th digit is automatically added.');
$error_stop = true;
}
if($error_stop === false) {
// 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);
}
}
}
/**
* Returns the maximal size of a barcode
*
* @return int[]
*/
public function getMaxSize() {
$p = parent::getMaxSize();
$startlength = 3 * $this->scale;
$centerlength = 5 * $this->scale;
$textlength = 8 * 7 * $this->scale;
$endlength = 3 * $this->scale;
return array($p[0] + $startlength + $centerlength + $textlength + $endlength, $p[1]);
}
/**
* 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;
}
/**
* Overloaded method for drawing special label
*
* @param resource $im
*/
protected function drawText($im) {
if($this->label !== BCGBarcode1D::AUTO_LABEL) {
parent::drawText($im);
} elseif($this->label !== '') {
$temp_text = $this->text . $this->keys[$this->checksumValue];
if($this->textfont instanceof BCGFont) {
$code1 = 0;
$code2 = 0;
$this->textfont->setText($temp_text);
$this->drawExtendedBars($im, $this->textfont->getHeight(), $code1, $code2);
// We need to separate the text, one on the left and one on the right
$text1 = substr($temp_text, 0, 4);
$text2 = substr($temp_text, 4, 4);
$font1 = clone $this->textfont;
$font2 = clone $this->textfont;
$font1->setText($text1);
$font2->setText($text2);
// The $this->res offset is to center without thinking of the white space in the guard
$xPosition1 = ($this->scale * 30 - $font1->getWidth()) / 2 + $code1 * $this->scale + $this->offsetX * $this->scale;
$xPosition2 = ($this->scale * 30 - $font2->getWidth()) / 2 + $code2 * $this->scale + $this->offsetX * $this->scale;
$yPosition = $this->thickness * $this->scale + $this->textfont->getHeight() + BCGBarcode1D::SIZE_SPACING_FONT + $this->offsetY * $this->scale;
$text_color = $this->colorFg->allocate($im);
$font1->draw($im, $text_color, $xPosition1, $yPosition);
$font2->draw($im, $text_color, $xPosition2, $yPosition);
} elseif($this->textfont !== 0) {
$code1 = 0;
$code2 = 0;
$this->drawExtendedBars($im, 9, $code1, $code2);
$xPosition1 = ($this->scale * 30 - imagefontwidth($this->textfont) * 4) / 2 + $code1 * $this->scale + $this->offsetX * $this->scale;
$xPosition2 = ($this->scale * 30 - imagefontwidth($this->textfont) * 4) / 2 + $code2 * $this->scale + $this->offsetX * $this->scale;
$yPosition = $this->thickness * $this->scale + 1 * $this->scale + $this->offsetY * $this->scale;
$text_color = $this->colorFg->allocate($im);
imagestring($im, $this->textfont, $xPosition1, $yPosition, substr($temp_text, 0, 4), $text_color);
imagestring($im, $this->textfont, $xPosition2, $yPosition, substr($temp_text, 4, 4), $text_color);
}
}
}
private function drawExtendedBars(&$im, $plus, &$code1, &$code2) {
$rememberX = $this->positionX;
$rememberH = $this->thickness;
// We increase the bars
$this->thickness = $this->thickness + ceil($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
$code2 = $this->positionX;
$this->positionX += 30;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX += 2;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX = $rememberX;
$this->thickness = $rememberH;
}
};
?>
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