image-in-browser/lib/exif/ifd-value/ifd-rational-value.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

import { IfdValue } from './ifd-value.js';
import { IfdValueType } from '../ifd-value-type.js';
import { Rational } from '../../common/rational.js';
import { ArrayUtils } from '../../common/array-utils.js';
export class IfdRationalValue extends IfdValue {
    get type() {
        return IfdValueType.rational;
    }
    get length() {
        return this._value.length;
    }
    constructor(value) {
        super();
        if (value instanceof Rational) {
            this._value = [value];
        }
        else {
            this._value = value;
        }
    }
    static data(data, length) {
        const array = new Array();
        for (let i = 0; i < length; i++) {
            const r = new Rational(data.readUint32(), data.readUint32());
            array.push(r);
        }
        return new IfdRationalValue(array);
    }
    static from(other) {
        const r = new Rational(other.numerator, other.denominator);
        return new IfdRationalValue(r);
    }
    toInt(index = 0) {
        return this._value[index].toInt;
    }
    toDouble(index = 0) {
        return this._value[index].toDouble;
    }
    toRational(index = 0) {
        return this._value[index];
    }
    write(out) {
        for (const v of this._value) {
            out.writeUint32(v.numerator);
            out.writeUint32(v.denominator);
        }
    }
    setRational(numerator, denominator, index = 0) {
        this._value[index] = new Rational(numerator, denominator);
    }
    equals(other) {
        return (other instanceof IfdRationalValue &&
            this.length === other.length &&
            ArrayUtils.equalsRationalArray(this._value, other._value));
    }
    clone() {
        return new IfdRationalValue(this._value);
    }
    toString() {
        return `${this.constructor.name} (${this._value.length === 1 ? `${this._value[0]}` : `${this._value}`})`;
    }
}
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