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// Encoding documentation: |
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// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Binary_encoding_of_data_digits_into_EAN-13_barcode |
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import EANencoder from './ean_encoder.js'; |
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import Barcode from "../Barcode.js"; |
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class EAN13 extends Barcode{ |
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constructor(data, options){ |
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// Add checksum if it does not exist |
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if(data.search(/^[0-9]{12}$/) !== -1){ |
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data += checksum(data); |
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} |
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super(data, options); |
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// Make sure the font is not bigger than the space between the guard bars (not used when flat=true) |
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this.fontSize = options.width * 10; |
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// Make the guard bars go down half the way of the text |
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this.guardHeight = options.height + this.fontSize / 2 + options.textMargin; |
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// Adds a last character to the end of the barcode |
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this.lastChar = options.lastChar; |
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} |
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valid(){ |
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return this.data.search(/^[0-9]{13}$/) !== -1 && |
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this.data[12] == checksum(this.data); |
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} |
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encode(){ |
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if(this.options.flat){ |
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return this.flatEncoding(); |
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} |
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else{ |
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return this.guardedEncoding(); |
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} |
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} |
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// Define the EAN-13 structure |
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getStructure(){ |
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return [ |
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"LLLLLL", |
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"LLGLGG", |
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"LLGGLG", |
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"LLGGGL", |
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"LGLLGG", |
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"LGGLLG", |
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"LGGGLL", |
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"LGLGLG", |
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"LGLGGL", |
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"LGGLGL" |
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]; |
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} |
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// The "standard" way of printing EAN13 barcodes with guard bars |
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guardedEncoding(){ |
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var encoder = new EANencoder(); |
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var result = []; |
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var structure = this.getStructure()[this.data[0]]; |
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// Get the string to be encoded on the left side of the EAN code |
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var leftSide = this.data.substr(1, 6); |
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// Get the string to be encoded on the right side of the EAN code |
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var rightSide = this.data.substr(7, 6); |
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// Add the first digigt |
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if(this.options.displayValue){ |
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result.push({ |
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data: "000000000000", |
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text: this.text.substr(0, 1), |
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options: {textAlign: "left", fontSize: this.fontSize} |
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}); |
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} |
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// Add the guard bars |
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result.push({ |
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data: "101", |
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options: {height: this.guardHeight} |
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}); |
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// Add the left side |
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result.push({ |
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data: encoder.encode(leftSide, structure), |
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text: this.text.substr(1, 6), |
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options: {fontSize: this.fontSize} |
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}); |
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// Add the middle bits |
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result.push({ |
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data: "01010", |
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options: {height: this.guardHeight} |
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}); |
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// Add the right side |
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result.push({ |
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data: encoder.encode(rightSide, "RRRRRR"), |
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text: this.text.substr(7, 6), |
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options: {fontSize: this.fontSize} |
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}); |
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// Add the end bits |
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result.push({ |
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data: "101", |
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options: {height: this.guardHeight} |
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}); |
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if(this.options.lastChar && this.options.displayValue){ |
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result.push({data: "00"}); |
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result.push({ |
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data: "00000", |
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text: this.options.lastChar, |
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options: {fontSize: this.fontSize} |
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}); |
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} |
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return result; |
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} |
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flatEncoding(){ |
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var encoder = new EANencoder(); |
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var result = ""; |
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var structure = this.getStructure()[this.data[0]]; |
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result += "101"; |
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result += encoder.encode(this.data.substr(1, 6), structure); |
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result += "01010"; |
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result += encoder.encode(this.data.substr(7, 6), "RRRRRR"); |
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result += "101"; |
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return { |
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data: result, |
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text: this.text |
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}; |
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} |
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} |
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// Calulate the checksum digit |
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// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit |
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function checksum(number){ |
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var result = 0; |
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var i; |
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for(i = 0; i < 12; i += 2){ |
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result += parseInt(number[i]); |
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} |
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for(i = 1; i < 12; i += 2){ |
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result += parseInt(number[i]) * 3; |
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} |
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return (10 - (result % 10)) % 10; |
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} |
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export default EAN13; |
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lindell /
JsBarcode
