246 lines
7.6 KiB
PHP
246 lines
7.6 KiB
PHP
<?php
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/**
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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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* @author Akhtar Khan <er.akhtarkhan@gmail.com>
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* @link http://www.codeitnow.in
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* @package https://github.com/codeitnowin/barcode-generator
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*/
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namespace CodeItNow\BarcodeBundle\Generator;
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use CodeItNow\BarcodeBundle\Generator\CINParseException;
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use CodeItNow\BarcodeBundle\Generator\CINBarcode;
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use CodeItNow\BarcodeBundle\Generator\CINBarcode1D;
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use CodeItNow\BarcodeBundle\Generator\CINLabel;
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class CINean8 extends CINBarcode1D {
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protected $labelLeft = null;
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protected $labelRight = null;
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/**
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* Constructor.
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*/
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public function __construct() {
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parent::__construct();
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$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 $im
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*/
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public function draw($im) {
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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, 0, 0, $this->positionX, $this->thickness);
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if ($this->isDefaultEanLabelEnabled()) {
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$dimension = $this->labelRight->getDimension();
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$this->drawExtendedBars($im, $dimension[1] - 2);
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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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* @param int $w
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* @param int $h
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* @return int[]
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*/
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public function getDimension($w, $h) {
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$startlength = 3;
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$centerlength = 5;
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$textlength = 8 * 7;
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$endlength = 3;
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$w += $startlength + $centerlength + $textlength + $endlength;
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$h += $this->thickness;
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return parent::getDimension($w, $h);
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}
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/**
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* Adds the default label.
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*/
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protected function addDefaultLabel() {
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if ($this->isDefaultEanLabelEnabled()) {
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$this->processChecksum();
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$label = $this->getLabel();
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$font = $this->font;
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$this->labelLeft = new CINLabel(substr($label, 0, 4), $font, CINLabel::POSITION_BOTTOM, CINLabel::ALIGN_LEFT);
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$labelLeftDimension = $this->labelLeft->getDimension();
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$this->labelLeft->setOffset(($this->scale * 30 - $labelLeftDimension[0]) / 2 + $this->scale * 2);
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$this->labelRight = new CINLabel(substr($label, 4, 3) . $this->keys[$this->checksumValue], $font, CINLabel::POSITION_BOTTOM, CINLabel::ALIGN_LEFT);
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$labelRightDimension = $this->labelRight->getDimension();
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$this->labelRight->setOffset(($this->scale * 30 - $labelRightDimension[0]) / 2 + $this->scale * 34);
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$this->addLabel($this->labelLeft);
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$this->addLabel($this->labelRight);
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}
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}
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/**
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* Checks if the default ean label is enabled.
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*
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* @return bool
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*/
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protected function isDefaultEanLabelEnabled() {
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$label = $this->getLabel();
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$font = $this->font;
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return $label !== null && $label !== '' && $font !== null && $this->defaultLabel !== null;
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}
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/**
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* Validates the input.
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*/
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protected function validate() {
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$c = strlen($this->text);
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if ($c === 0) {
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throw new CINParseException('ean8', 'No data has been entered.');
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}
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// Checking if all chars are allowed
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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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throw new CINParseException('ean8', 'The character \'' . $this->text[$i] . '\' is not allowed.');
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}
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}
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// If we have 8 chars just flush the last one
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if ($c === 8) {
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$this->text = substr($this->text, 0, 7);
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} elseif ($c !== 7) {
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throw new CINParseException('ean8', 'Must contain 7 digits, the 8th digit is automatically added.');
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}
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parent::validate();
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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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protected 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 - $this->checksumValue % 10) % 10;
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}
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/**
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* Overloaded method to display the checksum.
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*/
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protected function processChecksum() {
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if ($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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* Draws the extended bars on the image.
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*
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* @param resource $im
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* @param int $plus
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*/
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private function drawExtendedBars($im, $plus) {
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$rememberX = $this->positionX;
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$rememberH = $this->thickness;
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// We increase the bars
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$this->thickness = $this->thickness + intval($plus / $this->scale);
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$this->positionX = 0;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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// Center Guard Bar
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$this->positionX += 30;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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// Last Bars
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$this->positionX += 30;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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$this->positionX += 2;
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$this->drawSingleBar($im, CINBarcode::COLOR_FG);
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$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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