119 lines
5.3 KiB
PHP
119 lines
5.3 KiB
PHP
<?php
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// Simplified Barcode Generator for Code 128
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// Generates SVG output.
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class BarcodeGenerator
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{
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private $barcode_codes;
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public function __construct()
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{
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$this->barcode_codes = $this->getCode128Map();
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}
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public function getBarcode($code, $widthFactor = 1, $height = 50, $foregroundColor = 'black', $barReduction = 0)
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{
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$barcodeData = $this->getBarcodeData($code);
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if (!$barcodeData) return '';
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$bars = '';
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$quietZone = 10;
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$x = $quietZone;
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$barArray = str_split($barcodeData['bars']);
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for ($i = 0; $i < count($barArray); $i++) {
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$val = (int)$barArray[$i];
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$width = $widthFactor * $val;
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if ($i % 2 == 0) { // Even indices are bars, odd are spaces
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// Apply bar reduction to increase white space between bars
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$drawWidth = max(0.4, $width - $barReduction);
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$bars .= '<rect x="' . $x . '" y="0" width="' . $drawWidth . '" height="' . $height . '" fill="' . $foregroundColor . '" />';
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}
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$x += $width;
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}
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$totalWidth = $x + $quietZone;
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$svg = '<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="' . $totalWidth . '" height="' . $height . '" viewBox="0 0 ' . $totalWidth . ' ' . $height . '" shape-rendering="crispEdges">';
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$svg .= '<rect width="' . $totalWidth . '" height="' . $height . '" fill="white" />';
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$svg .= $bars;
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$svg .= '</svg>';
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return $svg;
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}
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private function getBarcodeData($code)
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{
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// Remove any accidental spaces and trim
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$code = str_replace(' ', '', trim($code));
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$len = strlen($code);
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$indices = [104]; // Start B (Standard Set B)
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for ($i = 0; $i < $len; $i++) {
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$char = $code[$i];
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$val = $this->getCharValue('B', $char);
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if ($val !== null) {
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$indices[] = $val;
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}
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}
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// Checksum calculation
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$sum = $indices[0];
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for ($i = 1; $i < count($indices); $i++) {
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$sum += ($indices[$i] * $i);
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}
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$checksum = $sum % 103;
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$indices[] = $checksum;
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$indices[] = 106; // Stop
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$bars = '';
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foreach ($indices as $index) {
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if (isset($this->barcode_codes['bars'][$index])) {
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$bars .= $this->barcode_codes['bars'][$index];
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}
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}
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return ['bars' => $bars];
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}
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private function getCharValue($set, $char)
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{
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if (isset($this->barcode_codes[$set][$char])) {
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return $this->barcode_codes[$set][$char];
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}
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return null;
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}
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private function getCode128Map()
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{
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return [
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'B' => [
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' ' => 0, '!' => 1, '"' => 2, '#' => 3, '$' => 4, '%' => 5, '&' => 6, '\'' => 7,
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'(' => 8, ')' => 9, '*' => 10, '+' => 11, ',' => 12, '-' => 13, '.' => 14, '/' => 15,
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'0' => 16, '1' => 17, '2' => 18, '3' => 19, '4' => 20, '5' => 21, '6' => 22, '7' => 23,
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'8' => 24, '9' => 25, ':' => 26, ';' => 27, '<' => 28, '=' => 29, '>' => 30, '?' => 31,
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'@' => 32, 'A' => 33, 'B' => 34, 'C' => 35, 'D' => 36, 'E' => 37, 'F' => 38, 'G' => 39,
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'H' => 40, 'I' => 41, 'J' => 42, 'K' => 43, 'L' => 44, 'M' => 45, 'N' => 46, 'O' => 47,
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'P' => 48, 'Q' => 49, 'R' => 50, 'S' => 51, 'T' => 52, 'U' => 53, 'V' => 54, 'W' => 55,
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'X' => 56, 'Y' => 57, 'Z' => 58, '[' => 59, '\\' => 60, ']' => 61, '^' => 62, '_' => 63,
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'`' => 64, 'a' => 65, 'b' => 66, 'c' => 67, 'd' => 68, 'e' => 69, 'f' => 70, 'g' => 71,
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'h' => 72, 'i' => 73, 'j' => 74, 'k' => 75, 'l' => 76, 'm' => 77, 'n' => 78, 'o' => 79,
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'p' => 80, 'q' => 81, 'r' => 82, 's' => 83, 't' => 84, 'u' => 85, 'v' => 86, 'w' => 87,
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'x' => 88, 'y' => 89, 'z' => 90, '{' => 91, '|' => 92, '}' => 93, '~' => 94
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],
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'bars' => [
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'212222', '222122', '222221', '121223', '121322', '131222', '122213', '122312', '132212', '221213', // 0-9
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'221312', '231212', '112232', '122132', '122231', '113222', '123122', '123221', '223211', '221132', // 10-19
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'221231', '213212', '223112', '312131', '311222', '321122', '321221', '312212', '322112', '322211', // 20-29
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'212123', '212321', '232121', '111323', '131123', '131321', '112313', '132113', '132311', '211313', // 30-39
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'231113', '231311', '112133', '112331', '132131', '113123', '113321', '133121', '313121', '211331', // 40-49
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'231131', '213113', '213311', '213131', '311123', '311321', '331121', '312113', '312311', '332111', // 50-59
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'314111', '221411', '413111', '111224', '111421', '121124', '121421', '141122', '141221', '112214', // 60-69
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'112412', '122114', '122411', '142112', '142211', '241211', '221114', '411122', '411221', '421121', // 70-79
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'421211', '212141', '214121', '412121', '111143', '111341', '131141', '114113', '114311', '411113', // 80-89
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'411311', '113141', '114131', '311141', '411131', '232131', '233131', '132131', '113131', '311131', // 90-99
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'311311', '331131', '313111', '211412', '211214', '211232', '2331112' // 100-106
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]
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];
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}
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}
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