238 lines
7.2 KiB
PHP
238 lines
7.2 KiB
PHP
<?php
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/**
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* BCGean8.barcode.php
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*--------------------------------------------------------------------
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*
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* Sub-Class - EAN-8
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*
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* EAN-8 contains
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* - 4 digits
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* - 3 digits
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* - 1 checksum
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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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* v2.0.1 8 mar 2009 Jean-Sébastien Goupil Fix padding for the barcode
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* v2.0.0 23 apr 2008 Jean-Sébastien Goupil New Version Update
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* v1.2.3 6 feb 2006 Jean-Sébastien Goupil Fix label position
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* v1.2.3b 31 dec 2005 Jean-Sébastien Goupil Checksum separated + PHP5.1 compatible
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* v1.2.2 23 jul 2005 Jean-Sébastien Goupil Enhance rapidity
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* v1.2.1 27 jun 2005 Jean-Sébastien Goupil Font support added
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* V1.00 17 jun 2004 Jean-Sebastien Goupil
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*--------------------------------------------------------------------
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* $Id: BCGean8.barcode.php,v 1.11 2009/11/09 04:13:35 jsgoupil Exp $
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* PHP5-Revision: 1.12
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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('BCGBarcode1D.php');
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class BCGean8 extends BCGBarcode1D {
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/**
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* Constructor
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*/
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function BCGean8() {
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BCGBarcode1D::BCGBarcode1D();
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$this->keys = array('0','1','2','3','4','5','6','7','8','9');
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// Left-Hand Odd Parity starting with a space
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// Right-Hand is the same of Left-Hand starting with a bar
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$this->code = array(
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'2100', /* 0 */
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'1110', /* 1 */
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'1011', /* 2 */
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'0300', /* 3 */
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'0021', /* 4 */
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'0120', /* 5 */
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'0003', /* 6 */
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'0201', /* 7 */
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'0102', /* 8 */
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'2001' /* 9 */
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);
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}
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/**
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* Draws the barcode
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*
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* @param resource $im
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*/
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function draw(&$im) {
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$error_stop = false;
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// Checking if all chars are allowed
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$c = strlen($this->text);
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for($i = 0; $i < $c; $i++) {
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if(array_search($this->text[$i], $this->keys) === false) {
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$this->drawError($im, 'Char \'' . $this->text[$i] . '\' not allowed.');
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$error_stop = true;
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}
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}
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if($error_stop === false) {
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// Must contain 7 chars
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if($c !== 7) {
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$this->drawError($im, 'Must contain 7 chars, the 8th digit is automatically added.');
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$error_stop = true;
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}
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if($error_stop === false) {
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// Checksum
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$this->calculateChecksum();
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$temp_text = $this->text . $this->keys[$this->checksumValue];
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// Starting Code
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$this->drawChar($im, '000', true);
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// Draw First 4 Chars (Left-Hand)
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for($i = 0; $i < 4; $i++) {
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$this->drawChar($im, $this->findCode($temp_text[$i]), false);
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}
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// Draw Center Guard Bar
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$this->drawChar($im, '00000', false);
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// Draw Last 4 Chars (Right-Hand)
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for($i = 4; $i < 8; $i++) {
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$this->drawChar($im, $this->findCode($temp_text[$i]), true);
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}
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// Draw Right Guard Bar
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$this->drawChar($im, '000', true);
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$this->drawText($im);
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}
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}
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}
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/**
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* Returns the maximal size of a barcode
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*
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* @return int[]
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*/
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function getMaxSize() {
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$p = BCGBarcode1D::getMaxSize();
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$startlength = 3 * $this->scale;
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$centerlength = 5 * $this->scale;
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$textlength = 8 * 7 * $this->scale;
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$endlength = 3 * $this->scale;
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return array($p[0] + $startlength + $centerlength + $textlength + $endlength, $p[1]);
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}
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/**
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* Overloaded method to calculate checksum
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*/
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function calculateChecksum() {
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// Calculating Checksum
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// Consider the right-most digit of the message to be in an "odd" position,
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// and assign odd/even to each character moving from right to left
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// Odd Position = 3, Even Position = 1
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// Multiply it by the number
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// Add all of that and do 10-(?mod10)
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$odd = true;
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$this->checksumValue = 0;
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$c = strlen($this->text);
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for($i = $c; $i > 0; $i--) {
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if($odd === true) {
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$multiplier = 3;
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$odd = false;
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} else {
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$multiplier = 1;
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$odd = true;
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}
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if(!isset($this->keys[$this->text[$i - 1]])) {
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return;
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}
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$this->checksumValue += $this->keys[$this->text[$i - 1]] * $multiplier;
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}
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$this->checksumValue = (10 - $this->checksumValue % 10) % 10;
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}
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/**
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* Overloaded method to display the checksum
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*/
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function processChecksum() {
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if($this->checksumValue === false) { // Calculate the checksum only once
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$this->calculateChecksum();
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}
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if($this->checksumValue !== false) {
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return $this->keys[$this->checksumValue];
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}
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return false;
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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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if($this->label !== $this->AUTO_LABEL) {
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BCGBarcode1D::drawText($im);
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} elseif($this->label !== '') {
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$temp_text = $this->text . $this->keys[$this->checksumValue];
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if(is_a($this->textfont, 'BCGFont')) {
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$code1 = 0;
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$code2 = 0;
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$this->textfont->setText($temp_text);
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$this->drawExtendedBars($im, $this->textfont->getHeight(), $code1, $code2);
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// We need to separate the text, one on the left and one on the right
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$text1 = substr($temp_text, 0, 4);
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$text2 = substr($temp_text, 4, 4);
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$font1 = $this->textfont; // clone
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$font2 = $this->textfont; // clone
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$font1->setText($text1);
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$font2->setText($text2);
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// The $this->res offset is to center without thinking of the white space in the guard
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$xPosition1 = ($this->scale * 30 - $font1->getWidth()) / 2 + $code1 * $this->scale + $this->offsetX * $this->scale;
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$xPosition2 = ($this->scale * 30 - $font2->getWidth()) / 2 + $code2 * $this->scale + $this->offsetX * $this->scale;
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$yPosition = $this->thickness * $this->scale + $this->textfont->getHeight() + $this->SIZE_SPACING_FONT + $this->offsetY * $this->scale;
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$text_color = $this->colorFg->allocate($im);
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$font1->draw($im, $text_color, $xPosition1, $yPosition);
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$font2->draw($im, $text_color, $xPosition2, $yPosition);
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} elseif($this->textfont !== 0) {
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$code1 = 0;
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$code2 = 0;
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$this->drawExtendedBars($im, 9, $code1, $code2);
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$xPosition1 = ($this->scale * 30 - imagefontwidth($this->textfont) * 4) / 2 + $code1 * $this->scale + $this->offsetX * $this->scale;
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$xPosition2 = ($this->scale * 30 - imagefontwidth($this->textfont) * 4) / 2 + $code2 * $this->scale + $this->offsetX * $this->scale;
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$yPosition = $this->thickness * $this->scale + 1 * $this->scale + $this->offsetY * $this->scale;
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$text_color = $this->colorFg->allocate($im);
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imagestring($im, $this->textfont, $xPosition1, $yPosition, substr($temp_text, 0, 4), $text_color);
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imagestring($im, $this->textfont, $xPosition2, $yPosition, substr($temp_text, 4, 4), $text_color);
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}
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}
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}
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function drawExtendedBars(&$im, $plus, &$code1, &$code2) {
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$rememberX = $this->positionX;
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$rememberH = $this->thickness;
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// We increase the bars
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$this->thickness = $this->thickness + ceil($plus / $this->scale);
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$this->positionX = 0;
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$this->drawSingleBar($im, $this->COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, $this->COLOR_FG);
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$code1 = $this->positionX;
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// Center Guard Bar
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$this->positionX += 30;
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$this->drawSingleBar($im, $this->COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, $this->COLOR_FG);
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// Last Bars
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$code2 = $this->positionX;
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$this->positionX += 30;
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$this->drawSingleBar($im, $this->COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, $this->COLOR_FG);
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$this->positionX = $rememberX;
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$this->thickness = $rememberH;
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}
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};
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?>
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