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<?php
/**
* BCGisbn.barcode.php
*--------------------------------------------------------------------
*
* Sub-Class - ISBN-10 and ISBN-13
*
* You can provide an ISBN with 10 digits with or without the checksum.
* You can provide an ISBN with 13 digits with or without the checksum.
* Calculate the ISBN based on the EAN-13 encoding.
*
* The checksum is always displayed.
*
*--------------------------------------------------------------------
* Revision History
* v2.0.0 23 apr 2008 Jean-Sébastien Goupil New Version Update
* v1.2.5 13 apr 2007 Jean-Sébastien Goupil
*--------------------------------------------------------------------
* $Id: BCGisbn.barcode.php,v 1.7 2010/02/14 00:24:07 jsgoupil Exp $
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGean13.barcode.php');
class BCGisbn extends BCGean13 {
const GS1_AUTO = 0;
const GS1_PREFIX978 = 1;
const GS1_PREFIX979 = 2;
private $gs1;
private $isbn_created;
private $isbn_text;
private $isbn_textfont;
private $forceOffsetY;
/**
* Constructor
*
* @param int $gs1
* @param string $isbn_text
* @param mixed $textfont2 BCGFont or int
*/
public function __construct($gs1 = self::GS1_AUTO, $isbn_text = BCGBarcode1D::AUTO_LABEL, $isbn_font = null) {
parent::__construct();
$this->forceOffsetY = false;
$this->setISBNFont($isbn_font);
$this->setISBNText($isbn_text);
$this->setGS1($gs1);
}
/**
* Saves Text
*
* @param string $text
*/
public function parse($text) {
BCGBarcode1D::parse(str_replace(array('-', ' '), '', $text));
$this->createISBNText();
$this->setLabelOffset();
}
/**
* Sets the first numbers of the barcode.
* - GS1_AUTO: Adds 978 before the code
* - GS1_PREFIX978: Adds 978 before the code
* - GS1_PREFIX979: Adds 979 before the code
*
* @param int $gs1
*/
public function setGS1($gs1) {
$gs1 = (int)$gs1;
if($gs1 !== self::GS1_AUTO && $gs1 !== self::GS1_PREFIX978 && $gs1 !== self::GS1_PREFIX979) {
$gs1 = self::GS1_AUTO;
}
$this->gs1 = $gs1;
}
/**
* Sets the font to write the ISBN text on the top of the barcode.
*
* @param mixed $font
*/
public function setISBNFont($font) {
if($font instanceof BCGFont) {
$this->isbn_textfont = clone $font;
} else if($font === null) {
$this->isbn_textfont = null;
} else {
$this->isbn_textfont = intval($font);
}
$this->setLabelOffset();
}
/**
* Sets the text for the ISBN value.
*
* @param string $isbn_text
*/
public function setISBNText($text) {
$this->isbn_text = $text;
$this->createISBNText();
$this->setLabelOffset();
}
public function setOffsetY($offsetY) {
parent::setOffsetY($offsetY);
// We force the offsetY, so we won't position based on the label position
$this->forceOffsetY = true;
}
public function getMaxSize() {
// We must compute the first digit calculating the width
$null = null;
$this->isLengthCorrect($null);
return parent::getMaxSize();
}
protected function setLabelOffset() {
parent::setLabelOffset();
if(!empty($this->isbn_created) && !$this->forceOffsetY) {
if($this->getISBNFont() instanceof BCGFont) {
$f = clone $this->getISBNFont();
$f->setText($this->isbn_created);
$val = ($f->getHeight() - $f->getUnderBaseline()) / $this->scale + BCGBarcode1D::SIZE_SPACING_FONT;
$this->offsetY = $val;
} elseif($this->getISBNFont() !== 0) {
$val = (imagefontheight($this->getISBNFont()) + 2) / $this->scale;
$this->offsetY = $val;
}
}
}
protected function isCharsAllowed(&$im) {
$c = strlen($this->text);
// Special case, if we have 10 digits, the last one can be X
if($c === 10) {
if(array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
$this->drawError($im, 'Char \'' . $this->text[9] . '\' not allowed.');
return false;
}
// Drop the last char
$this->text = substr($this->text, 0, 9);
}
return parent::isCharsAllowed($im);
}
protected function isLengthCorrect(&$im) {
$c = strlen($this->text);
// If we have 13 chars just flush the last one
if($c === 13) {
$this->text = substr($this->text, 0, 12);
return true;
} elseif($c === 12) {
return true;
} elseif($c === 9 || $c === 10) {
if($c === 10) {
// Before dropping it, we check if it's legal
if(array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
return false;
}
$this->text = substr($this->text, 0, 9);
}
if($this->gs1 === self::GS1_AUTO || $this->gs1 === self::GS1_PREFIX978) {
$this->text = '978' . $this->text;
} elseif($this->gs1 === self::GS1_PREFIX979) {
$this->text = '979' . $this->text;
}
// We changed the start, recalculate the offset label
parent::setLabelOffset();
return true;
} else {
if($im !== null) {
$this->drawError($im, 'Must provide 9, 10, 12 or 13 digits.');
}
return false;
}
}
/**
* Overloaded method for drawing special label
*
* @param resource $im
*/
protected function drawText($im) {
parent::drawText($im);
if(strlen($this->isbn_created) > 0) {
$pA = $this->getMaxSize();
$pB = BCGBarcode1D::getMaxSize();
$w = $pA[0] - $pB[0];
if($this->getISBNFont() instanceof BCGFont) {
$textfont = clone $this->getISBNFont();
$textfont->setText($this->isbn_created);
$xPosition = ($w / 2) - ($textfont->getWidth() / 2) + $this->offsetX * $this->scale;
$yPosition = $this->offsetY * $this->scale - BCGBarcode1D::SIZE_SPACING_FONT;
$textfont->draw($im, $this->colorFg->allocate($im), $xPosition, $yPosition);
} elseif($this->getISBNFont() !== 0) {
$xPosition = ($w / 2) - (strlen($this->isbn_created) / 2) * imagefontwidth($this->getISBNFont()) + $this->offsetX * $this->scale;
$yPosition = $this->offsetY * $this->scale - BCGBarcode1D::SIZE_SPACING_FONT - imagefontheight($this->getISBNFont());
imagestring($im, $this->getISBNFont(), $xPosition, $yPosition, $this->isbn_created, $this->colorFg->allocate($im));
}
}
}
private function getISBNFont() {
if($this->isbn_textfont === null) {
return $this->textfont;
} else {
return $this->isbn_textfont;
}
}
private function createISBNText() {
if($this->isbn_text === BCGBarcode1D::AUTO_LABEL && !empty($this->text)) {
// We try to create the ISBN Text... the hyphen really depends the ISBN agency.
// We just put one before the checksum and one after the GS1 if present.
$c = strlen($this->text);
if($c === 12 || $c === 13) {
// If we have 13 characters now, just transform it temporarily to find the checksum...
// Further in the code we take care of that anyway.
$lastCharacter = '';
if($c === 13) {
$lastCharacter = $this->text[12];
$this->text = substr($this->text, 0, 12);
}
$checksum = $this->processChecksum();
$this->isbn_created = 'ISBN ' . substr($this->text, 0, 3) . '-' . substr($this->text, 3, 9) . '-' . $checksum;
// Put the last character back
if($c === 13) {
$this->text .= $lastCharacter;
}
} elseif($c === 9 || $c === 10) {
$checksum = 0;
for($i = 10; $i >= 2; $i--) {
$checksum += $this->text[10 - $i] * $i;
}
$checksum = 11 - $checksum % 11;
if($checksum === 10) {
$checksum = 'X';
}
$this->isbn_created = 'ISBN ' . substr($this->text, 0, 9) . '-' . $checksum;
} else {
$this->isbn_created = '';
}
} else {
$this->isbn_created = $this->isbn_text;
}
}
};
?>
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