From ad8fe704590d4a617b066dcc22717c76c7a98cf2 Mon Sep 17 00:00:00 2001
From: Vladimir Demidov <demvlad2@yandex.ru>
Date: Fri, 30 May 2025 15:40:51 +0300
Subject: [PATCH 1/2] =?UTF-8?q?Revert=20"Bug=20fix:=20The=20spectrum=20gra?=
 =?UTF-8?q?ph=20is=20sometimes=20not=20displayed=20after=20change=20s?=
 =?UTF-8?q?=E2=80=A6"?=
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This reverts commit 692e02a7b8aed7847d7bea8657197017593be936.
---
 src/graph_spectrum.js | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/src/graph_spectrum.js b/src/graph_spectrum.js
index bfa93be1..c89251a5 100644
--- a/src/graph_spectrum.js
+++ b/src/graph_spectrum.js
@@ -17,16 +17,15 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
   let that = this,
     analyserZoomX = 1.0 /* 100% */,
     analyserZoomY = 1.0 /* 100% */,
+    dataBuffer = {
+      fieldIndex: 0,
+      curve: 0,
+      fieldName: null,
+    },
     dataReload = false,
     fftData = null,
     prefs = new PrefStorage();
 
-  this.dataBuffer = {
-    fieldIndex: 0,
-    curve: 0,
-    fieldName: null,
-  };
-
   try {
     let isFullscreen = false;
 
@@ -101,8 +100,9 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
       });
     };
 
-    const dataLoad = function () {
-      GraphSpectrumCalc.setDataBuffer(that.dataBuffer);
+    let dataLoad = function () {
+      GraphSpectrumCalc.setDataBuffer(dataBuffer);
+
       switch (userSettings.spectrumType) {
         case SPECTRUM_TYPE.FREQ_VS_THROTTLE:
           fftData = GraphSpectrumCalc.dataLoadFrequencyVsThrottle();
@@ -128,16 +128,19 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
            analyser on screen*/
     this.plotSpectrum = function (fieldIndex, curve, fieldName) {
       // Store the data pointers
+      dataBuffer = {
+        fieldIndex: fieldIndex,
+        curve: curve,
+        fieldName: fieldName,
+      };
 
-      that.dataBuffer.fieldIndex = fieldIndex;
-      that.dataBuffer.curve = curve;
-      that.dataBuffer.fieldName = fieldName;
       // Detect change of selected field.... reload and redraw required.
       if (fftData == null || fieldIndex != fftData.fieldIndex || dataReload) {
         dataReload = false;
         dataLoad();
         GraphSpectrumPlot.setData(fftData, userSettings.spectrumType);
       }
+
       that.draw(); // draw the analyser on the canvas....
     };
 
@@ -208,9 +211,9 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
           // Recalculate the data, for the same curve than now, and draw it
           dataReload = true;
           that.plotSpectrum(
-            that.dataBuffer.fieldIndex,
-            that.dataBuffer.curve,
-            that.dataBuffer.fieldName,
+            dataBuffer.fieldIndex,
+            dataBuffer.curve,
+            dataBuffer.fieldName
           );
         }
 

From aa8ea0ad8d0f94794b6b9076038c6a381ec2e9db Mon Sep 17 00:00:00 2001
From: Vladimir Demidov <demvlad2@yandex.ru>
Date: Fri, 30 May 2025 15:57:39 +0300
Subject: [PATCH 2/2] Code style improvement

---
 src/graph_spectrum.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/graph_spectrum.js b/src/graph_spectrum.js
index c89251a5..fc5db706 100644
--- a/src/graph_spectrum.js
+++ b/src/graph_spectrum.js
@@ -213,7 +213,7 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
           that.plotSpectrum(
             dataBuffer.fieldIndex,
             dataBuffer.curve,
-            dataBuffer.fieldName
+            dataBuffer.fieldName,
           );
         }