Resolved notice from haslinghuis

Author: demvlad

src/graph_spectrum_calc.js

@@ -110,11 +110,11 @@ GraphSpectrumCalc.dataLoadPSD = function(analyserZoomY) {
   const flightSamples = this._getFlightSamplesFreq(false);
 
   let pointsPerSegment = 512;
-  const multipler = Math.floor(1 / analyserZoomY); // 0. ... 10
-  if (multipler == 0) {
+  const multiplier = Math.floor(1 / analyserZoomY); // 0. ... 10
+  if (multiplier == 0) {
     pointsPerSegment = 256;
-  } else if(multipler > 1) {
-    pointsPerSegment *= 2 ** Math.floor(multipler / 2);
+  } else if(multiplier > 1) {
+    pointsPerSegment *= 2 ** Math.floor(multiplier / 2);
   }
   pointsPerSegment = Math.min(pointsPerSegment, flightSamples.samples.length);
   const overlapCount = Math.floor(pointsPerSegment / 2);
@@ -321,7 +321,7 @@ GraphSpectrumCalc._getFlightSamplesFreq = function(scaled = true) {
   for (const chunk of allChunks) {
     for (const frame of chunk.frames) {
       if (scaled) {
-        samples[samplesCount] = (this._dataBuffer.curve.lookupRaw(frame[this._dataBuffer.fieldIndex]));
+        samples[samplesCount] = this._dataBuffer.curve.lookupRaw(frame[this._dataBuffer.fieldIndex]);
       } else {
         samples[samplesCount] = frame[this._dataBuffer.fieldIndex];
       }
@@ -555,6 +555,15 @@ GraphSpectrumCalc._psd  = function(samples, pointsPerSegment, overlapCount, scal
 // Compute average for scaled power
   let min = 1e6,
       max = -1e6;
+  // Early exit if no segments were processed
+  if (segmentsCount === 0) {
+    return {
+      psdOutput: new Float64Array(0),
+      min: 0,
+      max: 0,
+      maxNoiseIdx: 0
+    };
+  }
   const maxFrequency = (this._blackBoxRate / 2.0);
   const noise50HzIdx = 50 / maxFrequency * dataCount;
   const noise3HzIdx = 3 / maxFrequency * dataCount;

src/graph_spectrum_plot.js

@@ -381,16 +381,16 @@ GraphSpectrumPlot._drawPowerSpectralDensityGraph = function (canvasCtx) {
   );
   const offset = 1;
   this._drawInterestFrequency(
-      canvasCtx,
-      this._fftData.maxNoiseIdx,
-      PLOTTED_BLACKBOX_RATE,
-      "Max noise",
-      WIDTH,
-      HEIGHT,
-      15 * offset + MARGIN,
-      "rgba(255,0,0,0.50)",
-      3,
-    );
+    canvasCtx,
+    this._fftData.maxNoiseIdx,
+    PLOTTED_BLACKBOX_RATE,
+    "Max noise",
+    WIDTH,
+    HEIGHT,
+    15 * offset + MARGIN,
+    "rgba(255,0,0,0.50)",
+    3,
+  );
 
   canvasCtx.restore();
 };
@@ -1081,29 +1081,29 @@ GraphSpectrumPlot._drawVerticalGridLines = function (
   minValue,
   maxValue,
   label,
-  Ticks = 5,
+  ticks = 5,
 ) {
 
-  for (let i = 0; i <= Ticks; i++) {
+  for (let i = 0; i <= ticks; i++) {
     canvasCtx.beginPath();
     canvasCtx.lineWidth = 1;
     canvasCtx.strokeStyle = "rgba(255,255,255,0.25)";
 
-    const verticalPosition = i * (HEIGHT / Ticks);
+    const verticalPosition = i * (HEIGHT / ticks);
     canvasCtx.moveTo(0, verticalPosition);
     canvasCtx.lineTo(WIDTH, verticalPosition);
 
     canvasCtx.stroke();
     const verticalAxisValue = (
-      (maxValue - minValue) * ((Ticks - i) / Ticks) +
+      (maxValue - minValue) * ((ticks - i) / ticks) +
       minValue
     ).toFixed(0);
     let textBaseline;
     switch (i) {
       case 0:
         textBaseline = "top";
         break;
-      case Ticks:
+      case ticks:
         textBaseline = "bottom";
         break;
       default: