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Waterfall.js
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Waterfall.js
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const EventEmitter = require("events");
const WiPryClarity = require("./WiPryClarity");
class Waterfall extends EventEmitter {
constructor() {
super();
this._onConnected = this._onConnected.bind(this);
this._onData = this._onData.bind(this);
this.config = null;
this.mon = WiPryClarity;
}
open() {
this.mon.on("connected", this._onConnected);
this.mon.on("rssidata", this._onData);
this.mon.open();
}
close() {
this.mon.close();
this.mon.off("connected", this._onConnected);
this.mon.off("rssidata", this._onData);
}
_onConnected(config) {
this.config = config;
this.points = new Float32Array(this.config.samples);
}
_onData(_, data) {
const now = Date.now();
for (let i = this.points.length - 1; i >= 0; i--) {
const opoint = this.points[i];
const npoint = data[i];
if (npoint > opoint || opoint == 0) {
this.points[i] = npoint;
}
else {
this.points[i] = opoint * 0.9 + npoint * 0.1;
}
}
this.period = (now - this.lastUpdate) / 1000;
this.lastUpdate = now;
this.emit("update");
}
}
module.exports = Waterfall;