@showbridge/lib/dist/lib/transforms/scale-transform.js

Main library for showbridge protocol router

import { get, has, set } from 'lodash-es';
import { logger } from '../utils/index.js';
import Transform from './transform.js';
class ScaleTransform extends Transform {
    _transform(msg, vars) {
        logger.trace(`transform: before ${this.type} = ${msg}`);
        try {
            const resolvedParams = this.resolveTemplatedParams({ msg, vars });
            const propertyValue = get(msg, resolvedParams.property);
            if (propertyValue === undefined) {
                logger.error(`transform: scale transform could not find msg property = ${resolvedParams.property}`);
                return;
            }
            if (typeof propertyValue !== 'number') {
                logger.error('transform: scale only works on number values');
                return;
            }
            if (!has(resolvedParams, 'inRange') || !has(resolvedParams, 'outRange')) {
                logger.error('transform: scale must have both an inRange and an outRange property');
                return;
            }
            const { inRange, outRange } = resolvedParams;
            const scaledValue = ((propertyValue - inRange[0]) * (outRange[1] - outRange[0])) / (inRange[1] - inRange[0]) + outRange[0];
            set(msg, resolvedParams.property, scaledValue);
            logger.trace(`transform: after ${this.type} = ${msg}`);
        }
        catch (error) {
            logger.error(`transform: problem executing scale transform - ${error}`);
        }
    }
}
export default ScaleTransform;