From 67d4e3d105064129621d91de73cc1e7a9e5ee77b Mon Sep 17 00:00:00 2001
From: f4exb <f4exb06@gmail.com>
Date: Sat, 28 May 2022 23:44:53 +0200
Subject: [PATCH] DOA2: set scope timescale display as frequency in FFT
 (correlation) mode for X and XY displays

---
 plugins/channelmimo/doa2/doa2gui.cpp | 15 +++++++++++++++
 plugins/channelmimo/doa2/doa2gui.h   |  1 +
 plugins/channelmimo/doa2/doa2gui.ui  | 13 +++++++++++++
 sdrgui/gui/glscope.cpp               | 24 +++++++++++++++++++-----
 sdrgui/gui/glscope.h                 |  8 ++++++++
 5 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/plugins/channelmimo/doa2/doa2gui.cpp b/plugins/channelmimo/doa2/doa2gui.cpp
index 417d3c347..0f263e33b 100644
--- a/plugins/channelmimo/doa2/doa2gui.cpp
+++ b/plugins/channelmimo/doa2/doa2gui.cpp
@@ -333,6 +333,7 @@ void DOA2GUI::onMenuDialogCalled(const QPoint &p)
 void DOA2GUI::on_decimationFactor_currentIndexChanged(int index)
 {
     m_settings.m_log2Decim = index;
+    updateScopeFScale();
     applyDecimation();
 }
 
@@ -352,6 +353,7 @@ void DOA2GUI::on_phaseCorrection_valueChanged(int value)
 void DOA2GUI::on_correlationType_currentIndexChanged(int index)
 {
     m_settings.m_correlationType = (DOA2Settings::CorrelationType) index;
+    updateScopeFScale();
     applySettings();
 }
 
@@ -438,6 +440,19 @@ void DOA2GUI::updateAbsoluteCenterFrequency()
     setStatusFrequency(cf);
     m_hwl = 1.5e+8 / cf;
     ui->halfWLText->setText(tr("%1").arg(m_hwl*1000, 5, 'f', 0));
+    updateScopeFScale();
+}
+
+void DOA2GUI::updateScopeFScale()
+{
+    if (m_settings.m_correlationType == DOA2Settings::CorrelationType::CorrelationFFT) {
+        ui->glScope->setXScaleFreq(true);
+    } else {
+        ui->glScope->setXScaleFreq(false);
+    }
+
+    ui->glScope->setXScaleCenterFrequency(m_centerFrequency);
+    ui->glScope->setXScaleFrequencySpan(m_sampleRate / (1<<m_settings.m_log2Decim));
 }
 
 void DOA2GUI::updateDOA()
diff --git a/plugins/channelmimo/doa2/doa2gui.h b/plugins/channelmimo/doa2/doa2gui.h
index e38956532..09ea9c0ca 100644
--- a/plugins/channelmimo/doa2/doa2gui.h
+++ b/plugins/channelmimo/doa2/doa2gui.h
@@ -90,6 +90,7 @@ private:
     bool handleMessage(const Message& message);
     void makeUIConnections();
     void updateAbsoluteCenterFrequency();
+    void updateScopeFScale();
     void updateDOA();
 
 	void leaveEvent(QEvent*);
diff --git a/plugins/channelmimo/doa2/doa2gui.ui b/plugins/channelmimo/doa2/doa2gui.ui
index 9da1d4131..4df4a6c1e 100644
--- a/plugins/channelmimo/doa2/doa2gui.ui
+++ b/plugins/channelmimo/doa2/doa2gui.ui
@@ -884,6 +884,19 @@
         </item>
        </layout>
       </item>
+      <item>
+       <spacer name="horizontalSpacer_5">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
      </layout>
     </item>
    </layout>
diff --git a/sdrgui/gui/glscope.cpp b/sdrgui/gui/glscope.cpp
index f8608af91..6a6a778ba 100644
--- a/sdrgui/gui/glscope.cpp
+++ b/sdrgui/gui/glscope.cpp
@@ -75,6 +75,9 @@ GLScope::GLScope(QWidget *parent) :
     m_x1Scale.setOrientation(Qt::Horizontal);
     m_x2Scale.setFont(font());
     m_x2Scale.setOrientation(Qt::Horizontal);
+    m_xScaleFreq = false;
+    m_xScaleCenterFrequency = 0;
+    m_xScaleFrequencySpan = 48000;
 
     m_channelOverlayFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
     m_channelOverlayFont.setBold(true);
@@ -1077,12 +1080,23 @@ void GLScope::applyConfig()
 
     // scales
 
-    m_x1Scale.setRange(Unit::Time, t_start, t_start + t_len); // time scale
-
-    if (m_displayMode == DisplayPol) {
-        setYScale(m_x2Scale, 0); // polar scale (X)
+    if (m_xScaleFreq) {
+        m_x1Scale.setRange(Unit::Frequency, m_xScaleCenterFrequency - (m_xScaleFrequencySpan/2), m_xScaleCenterFrequency + (m_xScaleFrequencySpan/2));
     } else {
-        m_x2Scale.setRange(Unit::Time, t_start, t_start + t_len); // time scale
+        m_x1Scale.setRange(Unit::Time, t_start, t_start + t_len); // time scale
+    }
+
+    if (m_displayMode == DisplayPol)
+    {
+        setYScale(m_x2Scale, 0); // polar scale (X)
+    }
+    else
+    {
+        if (m_xScaleFreq) {
+            m_x2Scale.setRange(Unit::Time, t_start, t_start + t_len); // time scale
+        } else {
+            m_x2Scale.setRange(Unit::Frequency, m_xScaleCenterFrequency - (m_xScaleFrequencySpan/2), m_xScaleCenterFrequency + (m_xScaleFrequencySpan/2));
+        }
     }
 
     if (m_traces->size() > 0) {
diff --git a/sdrgui/gui/glscope.h b/sdrgui/gui/glscope.h
index 65c7df0f6..560912c06 100644
--- a/sdrgui/gui/glscope.h
+++ b/sdrgui/gui/glscope.h
@@ -86,6 +86,11 @@ public:
     virtual const QAtomicInt& getProcessingTraceIndex() const { return m_processingTraceIndex; }
     void setTraceModulo(int modulo) { m_traceModulo = modulo; }
 
+    void setXScaleFreq(bool set) { m_xScaleFreq = set; m_configChanged = true; }
+    bool isXScaleFreq() const { return m_xScaleFreq; }
+    void setXScaleCenterFrequency(qint64 cf) { m_xScaleCenterFrequency = cf; m_configChanged = true; }
+    void setXScaleFrequencySpan(int span) { m_xScaleFrequencySpan = span; m_configChanged = true; }
+
 signals:
     void sampleRateChanged(int);
     void traceSizeChanged(uint32_t);
@@ -187,6 +192,9 @@ private:
     ScaleEngine m_x2Scale; //!< Display #2 X scale. Time scale
     ScaleEngine m_y1Scale; //!< Display #1 Y scale. Always connected to trace #0 (X trace)
     ScaleEngine m_y2Scale; //!< Display #2 Y scale. Connected to highlighted Y trace (#1..n)
+    bool m_xScaleFreq;              //!< Force frequency display on time line for correlation modes
+    qint64 m_xScaleCenterFrequency; //!< Frequency time line mode center frequency
+    int m_xScaleFrequencySpan;      //!< Frequency time line mode frequency span
 
     QFont m_channelOverlayFont;
     QFont m_textOverlayFont;