268 lines
7.3 KiB
PHP
268 lines
7.3 KiB
PHP
<?php
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/**
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* BCGisbn.barcode.php
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*--------------------------------------------------------------------
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*
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* Sub-Class - ISBN-10 and ISBN-13
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*
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* You can provide an ISBN with 10 digits with or without the checksum.
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* You can provide an ISBN with 13 digits with or without the checksum.
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* Calculate the ISBN based on the EAN-13 encoding.
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*
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* The checksum is always displayed.
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*
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*--------------------------------------------------------------------
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* Revision History
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* v2.0.0 23 apr 2008 Jean-Sébastien Goupil New Version Update
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* v1.2.5 13 apr 2007 Jean-Sébastien Goupil
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*--------------------------------------------------------------------
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* $Id: BCGisbn.barcode.php,v 1.6 2010/02/14 00:25:14 jsgoupil Exp $
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* PHP5-Revision: 1.7
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*--------------------------------------------------------------------
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* Copyright (C) Jean-Sebastien Goupil
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* http://www.barcodephp.com
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*/
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include_once('BCGean13.barcode.php');
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class BCGisbn extends BCGean13 {
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var $GS1_AUTO = 0; // const
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var $GS1_PREFIX978 = 1; // const
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var $GS1_PREFIX979 = 2; // const
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var $gs1;
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var $isbn_created;
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var $isbn_text;
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var $isbn_textfont;
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var $forceOffsetY;
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/**
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* Constructor
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*
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* @param int $gs1
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* @param string $isbn_text
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* @param mixed $textfont2 BCGFont or int
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*/
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function BCGisbn($gs1 = 0, $isbn_text = '##!!AUTO_LABEL!!##', $isbn_font = null) {
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BCGean13::BCGean13();
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$this->forceOffsetY = false;
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$this->setISBNFont($isbn_font);
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$this->setISBNText($isbn_text);
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$this->setGS1($gs1);
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}
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/**
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* Saves Text
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*
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* @param string $text
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*/
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function parse($text) {
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BCGBarcode1D::parse(str_replace(array('-', ' '), '', $text));
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$this->createISBNText();
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$this->setLabelOffset();
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}
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/**
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* Sets the first numbers of the barcode.
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* - GS1_AUTO: Adds 978 before the code
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* - GS1_PREFIX978: Adds 978 before the code
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* - GS1_PREFIX979: Adds 979 before the code
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*
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* @param int $gs1
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*/
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function setGS1($gs1) {
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$gs1 = (int)$gs1;
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if($gs1 !== $this->GS1_AUTO && $gs1 !== $this->GS1_PREFIX978 && $gs1 !== $this->GS1_PREFIX979) {
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$gs1 = $this->GS1_AUTO;
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}
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$this->gs1 = $gs1;
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}
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/**
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* Sets the font to write the ISBN text on the top of the barcode.
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*
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* @param mixed $font
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*/
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function setISBNFont($font) {
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if(is_a($font, 'BCGFont')) {
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$this->isbn_textfont = $font; // clone
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} else if($font === null) {
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$this->isbn_textfont = null;
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} else {
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$this->isbn_textfont = intval($font);
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}
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$this->setLabelOffset();
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}
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/**
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* Sets the text for the ISBN value.
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*
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* @param string $isbn_text
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*/
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function setISBNText($text) {
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$this->isbn_text = $text;
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$this->createISBNText();
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$this->setLabelOffset();
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}
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function setOffsetY($offsetY) {
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BCGean13::setOffsetY($offsetY);
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// We force the offsetY, so we won't position based on the label position
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$this->forceOffsetY = true;
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}
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function getMaxSize() {
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// We must compute the first digit calculating the width
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$null = null;
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$this->isLengthCorrect($null);
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return BCGean13::getMaxSize();
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}
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function setLabelOffset() {
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BCGean13::setLabelOffset();
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if(!empty($this->isbn_created) && !$this->forceOffsetY) {
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if(is_a($this->getISBNFont(), 'BCGFont')) {
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$f = $this->getISBNFont(); // clone
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$f->setText($this->isbn_created);
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$val = ($f->getHeight() - $f->getUnderBaseline()) / $this->scale + $this->SIZE_SPACING_FONT;
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$this->offsetY = $val;
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} elseif($this->getISBNFont() !== 0) {
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$val = (imagefontheight($this->getISBNFont()) + 2) / $this->scale;
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$this->offsetY = $val;
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}
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}
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}
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function isCharsAllowed(&$im) {
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$c = strlen($this->text);
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// Special case, if we have 10 digits, the last one can be X
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if($c === 10) {
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if(array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
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$this->drawError($im, 'Char \'' . $this->text[9] . '\' not allowed.');
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return false;
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}
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// Drop the last char
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$this->text = substr($this->text, 0, 9);
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}
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return BCGean13::isCharsAllowed($im);
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}
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function isLengthCorrect(&$im) {
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$c = strlen($this->text);
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// If we have 13 chars just flush the last one
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if($c === 13) {
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$this->text = substr($this->text, 0, 12);
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return true;
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} elseif($c === 12) {
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return true;
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} elseif($c === 9 || $c === 10) {
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if($c === 10) {
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// Before dropping it, we check if it's legal
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if(array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
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return false;
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}
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$this->text = substr($this->text, 0, 9);
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}
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if($this->gs1 === $this->GS1_AUTO || $this->gs1 === $this->GS1_PREFIX978) {
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$this->text = '978' . $this->text;
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} elseif($this->gs1 === $this->GS1_PREFIX979) {
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$this->text = '979' . $this->text;
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}
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// We changed the start, recalculate the offset label
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BCGean13::setLabelOffset();
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return true;
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} else {
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if($im !== null) {
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$this->drawError($im, 'Must provide 9, 10, 12 or 13 digits.');
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}
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return false;
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}
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}
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/**
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* Overloaded method for drawing special label
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*
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* @param resource $im
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*/
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function drawText(&$im) {
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BCGean13::drawText($im);
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if(strlen($this->isbn_created) > 0) {
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$pA = $this->getMaxSize();
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$pB = BCGBarcode1D::getMaxSize();
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$w = $pA[0] - $pB[0];
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if(is_a($this->getISBNFont(), 'BCGFont')) {
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$textfont = $this->getISBNFont(); // clone
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$textfont->setText($this->isbn_created);
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$xPosition = ($w / 2) - ($textfont->getWidth() / 2) + $this->offsetX * $this->scale;
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$yPosition = $this->offsetY * $this->scale - $this->SIZE_SPACING_FONT;
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$textfont->draw($im, $this->colorFg->allocate($im), $xPosition, $yPosition);
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} elseif($this->getISBNFont() !== 0) {
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$xPosition = ($w / 2) - (strlen($this->isbn_created) / 2) * imagefontwidth($this->getISBNFont()) + $this->offsetX * $this->scale;
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$yPosition = $this->offsetY * $this->scale - $this->SIZE_SPACING_FONT - imagefontheight($this->getISBNFont());
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imagestring($im, $this->getISBNFont(), $xPosition, $yPosition, $this->isbn_created, $this->colorFg->allocate($im));
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}
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}
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}
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function &getISBNFont() {
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if($this->isbn_textfont === null) {
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return $this->textfont;
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} else {
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return $this->isbn_textfont;
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}
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}
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function createISBNText() {
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if($this->isbn_text === $this->AUTO_LABEL && !empty($this->text)) {
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// We try to create the ISBN Text... the hyphen really depends the ISBN agency.
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// We just put one before the checksum and one after the GS1 if present.
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$c = strlen($this->text);
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if($c === 12 || $c === 13) {
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// If we have 13 characters now, just transform it temporarily to find the checksum...
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// Further in the code we take care of that anyway.
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$lastCharacter = '';
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if($c === 13) {
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$lastCharacter = $this->text[12];
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$this->text = substr($this->text, 0, 12);
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}
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$checksum = $this->processChecksum();
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$this->isbn_created = 'ISBN ' . substr($this->text, 0, 3) . '-' . substr($this->text, 3, 9) . '-' . $checksum;
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// Put the last character back
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if($c === 13) {
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$this->text .= $lastCharacter;
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}
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} elseif($c === 9 || $c === 10) {
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$checksum = 0;
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for($i = 10; $i >= 2; $i--) {
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$checksum += $this->text[10 - $i] * $i;
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}
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$checksum = 11 - $checksum % 11;
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if($checksum === 10) {
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$checksum = 'X';
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}
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$this->isbn_created = 'ISBN ' . substr($this->text, 0, 9) . '-' . $checksum;
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} else {
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$this->isbn_created = '';
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}
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} else {
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$this->isbn_created = $this->isbn_text;
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}
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}
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};
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?>
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