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<?php |
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namespace Graze\CiffRenderer\BarcodeGenerator; |
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use Graze\CiffRenderer\BarcodeGenerator\BarcodeGeneratorInterface; |
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use Graze\CiffRenderer\BarcodeGenerator\BarcodeType; |
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use Graze\CiffRenderer\BarcodeGenerator\BarcodeGeneratorEan13; |
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class BarcodeGeneratorEan13 implements BarcodeGeneratorInterface |
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{ |
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/** |
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* @param string $data |
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* @return string |
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*/ |
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public function generate($data) |
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{ |
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// add up each digit in the barcode - odd digits counting |
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// from the right are tripled before being added |
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$sum = 0; |
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$triple = true; |
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for ($i = strlen($data)-1; $i >= 0; $i--) { |
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$sum += ($triple ? 3 : 1) * $data[$i]; |
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$triple = !$triple; |
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} |
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//check digit is the inverse remainder after / by 10 |
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//e.g. 4 becomes 6, 8 becomes 2 etc... |
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$remainder = $sum % 10; |
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if ($remainder > 0) { |
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$remainder = 10 - $remainder; |
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} |
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return $this->convertToFontCode($data . $remainder); |
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} |
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/** |
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* @param string $barcode |
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* @return string |
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*/ |
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private function convertToFontCode($barcode) |
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{ |
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/** |
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* The barcode is split into the following sections: |
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* First digit |
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* First group of 6 digits (2nd-7th) |
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* Last group of 6 digits (8th-13th) |
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* e.g. 1234567890128 |
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* becomes 1 234567 890128 |
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* |
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* The font converts the first digit to a char between q-z |
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* |
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* The first group of digits are converted to chars starting at either A or Q, |
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* the first digit affects the format of the first group as follows: |
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* 1st digit First group format |
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* 0 AAAAAA |
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* 1 AAQAQQ |
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* 2 AAQQAQ |
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* 3 AAQQQA |
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* 4 AQAAQQ |
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* 5 AQQAAQ |
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* 6 AQQQAA |
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* 7 AQAQAQ |
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* 8 AQAQQA |
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* 9 AQQAQA |
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* |
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* The last group of digits remain unchanged |
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* |
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* The actual format used by the font is: |
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* firstDigit {{{{{| firstGroup {|{ secondGroup | |
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*/ |
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// convert first digit |
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$firstDigit = (int)substr($barcode, 0, 1); |
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$firstDigitChar = chr(113 + $firstDigit); |
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// convert first group |
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$firstGroup = ''; |
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$firstGroupFormats = [ |
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'AAAAAA', |
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'AAQAQQ', |
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'AAQQAQ', |
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'AAQQQA', |
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'AQAAQQ', |
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'AQQAAQ', |
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'AQQQAA', |
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'AQAQAQ', |
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'AQAQQA', |
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'AQQAQA' |
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]; |
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$firstGroupFormat = $firstGroupFormats[$firstDigit]; |
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for ($i = 1; $i <= 6; $i++) { |
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$digit = (int)substr($barcode, $i, 1); |
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$startingChar = substr($firstGroupFormat, $i - 1, 1); |
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$firstGroup .= chr(ord($startingChar) + $digit); |
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} |
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// extract second group |
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$secondGroup = substr($barcode, 7); |
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// combine the barcode with the special chars used by the font |
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return $firstDigitChar.'{{{{{|'.$firstGroup.'{|{'.$secondGroup.'|'; |
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} |
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} |
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graze /
ciff-renderer
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