red-agate-barcode
Version:
red-agate barcode tag library.
60 lines • 2.27 kB
JavaScript
// Copyright (c) 2017, Shellyl_N and Authors
// license: ISC
// https://github.com/shellyln
import { barcodeBasePropsDefault, BarcodeBase } from './BarcodeBase';
import { charactersMap } from './data/Itf.data';
export const itfPropsDefault = Object.assign({}, barcodeBasePropsDefault, {
addCheckDigit: true,
narrowWidth: 0.33,
wideWidth: 0.66
});
export class Itf extends BarcodeBase {
constructor(props) {
super(Object.assign({}, itfPropsDefault, props), charactersMap);
}
calcSymbolSize(data, startChar, stopChar, cdChar) {
const props = this.props;
// module width (bar + space + gap)
const mw = props.narrowWidth * 3 + props.wideWidth * 2;
return {
// total width (quiet + data + start + stop + cd)
tw: props.quietWidth * 2 + (props.narrowWidth * 8) + mw * data.length * 2,
// total height (quiet + bar + text)
th: props.quietHeight * 2 + props.height + (props.drawText ? props.textHeight : 0)
};
}
calcItfMod10W3Checksum(data) {
let odd = 0, even = 0;
for (let i = 0; i < data.length; i++) {
// most right -> odd
if ((i + 1) % 2) {
odd = (odd + Number.parseInt(data[data.length - 1 - i], 10)) % 10;
}
else {
even = (even + Number.parseInt(data[data.length - 1 - i], 10)) % 10;
}
}
return String((10 - ((odd * 3 + even) % 10)) % 10);
}
encodeData(data) {
let labelText = data;
if (this.props.addCheckDigit) {
const cd = this.calcItfMod10W3Checksum(data);
labelText += cd;
}
let d = "";
if (labelText.length % 2) {
throw new Error("bad data length");
}
for (let i = 0; i < labelText.length; i += 2) {
const c = Number.parseInt(labelText.slice(i, i + 2), 10);
d += String.fromCharCode(c);
}
return { data: d, labelText, startChar: "\x64", stopChar: "\x65" };
}
getBarSpaceWidth() {
const props = this.props;
return [0, props.narrowWidth, props.wideWidth];
}
}
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