From 7333519f602f91500853827bb059c52d8419a899 Mon Sep 17 00:00:00 2001
From: Alex Spataru <alex_spataru@outlook.com>
Date: Tue, 19 Oct 2021 01:24:19 -0500
Subject: [PATCH] Enforce minimum FFT sample size

---
 assets/qml/JsonEditor/JsonDatasetDelegate.qml | 2 +-
 src/JSON/Dataset.cpp                          | 1 +
 src/Widgets/FFTPlot.cpp                       | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/assets/qml/JsonEditor/JsonDatasetDelegate.qml b/assets/qml/JsonEditor/JsonDatasetDelegate.qml
index 49002977..1948cb15 100644
--- a/assets/qml/JsonEditor/JsonDatasetDelegate.qml
+++ b/assets/qml/JsonEditor/JsonDatasetDelegate.qml
@@ -193,7 +193,7 @@ Widgets.Window {
             text: Cpp_JSON_Editor.datasetFFTSamples(group, dataset)
             onTextChanged: Cpp_JSON_Editor.setDatasetFFTSamples(group, dataset, parseInt(text))
             validator: IntValidator {
-                bottom: 128
+                bottom: 8
                 top: 40 * 1000
             }
         }
diff --git a/src/JSON/Dataset.cpp b/src/JSON/Dataset.cpp
index eefdc5b4..e81790d7 100644
--- a/src/JSON/Dataset.cpp
+++ b/src/JSON/Dataset.cpp
@@ -38,6 +38,7 @@ Dataset::Dataset(QObject *parent)
     , m_max("0")
     , m_min("0")
     , m_alarm("0")
+    , m_fftSamples(8)
 {
 }
 
diff --git a/src/Widgets/FFTPlot.cpp b/src/Widgets/FFTPlot.cpp
index 21481fa2..fec6fc14 100644
--- a/src/Widgets/FFTPlot.cpp
+++ b/src/Widgets/FFTPlot.cpp
@@ -93,7 +93,7 @@ FFTPlot::FFTPlot(const int index)
     if (dataset)
     {
         // Calculate FFT size
-        int size = dataset->fftSamples();
+        int size = qMax(8, dataset->fftSamples());
 
         // Ensure that FFT size is valid
         while (m_transformer.setSize(size) != QFourierTransformer::FixedSize)