option to link RHS ticks to LHS ticks on XY-plots

Software/PC_Application/LibreVNA-GUI/Traces/traceaxis.cpp

@@ -97,6 +97,7 @@ static void createLogarithmicTicks(vector<double>& ticks, double start, double s
 YAxis::YAxis()
 {
     type = Type::Magnitude;
+    tickMaster = nullptr;
 }
 
 double YAxis::sampleToCoordinate(Trace::Data data, Trace *t, unsigned int sample)
@@ -391,6 +392,17 @@ std::complex<double> YAxis::reconstructValueFromYAxisType(std::map<YAxis::Type,
     return ret;
 }
 
+void YAxis::updateTicks()
+{
+    Axis::updateTicks();
+    if((autorange || autoDivs) && tickMaster && Preferences::getInstance().Graphs.enableMasterTicksForYAxis) {
+        ticks.clear();
+        for(auto masterTick : tickMaster->getTicks()) {
+            ticks.push_back(Util::Scale(masterTick, tickMaster->rangeMin, tickMaster->rangeMax, rangeMin, rangeMax));
+        }
+    }
+}
+
 bool XAxis::isSupported(XAxis::Type type, TraceModel::DataSource source)
 {
     if(source == TraceModel::DataSource::VNA) {

Software/PC_Application/LibreVNA-GUI/Traces/traceaxis.h

@@ -22,7 +22,7 @@ public:
     const std::vector<double> &getTicks() const;
 
 protected:
-    void updateTicks();
+    virtual void updateTicks();
     bool log;
     bool autorange;
     double rangeMin;
@@ -99,14 +99,22 @@ public:
     QString Unit(TraceModel::DataSource source = TraceModel::DataSource::VNA);
     QString Prefixes(TraceModel::DataSource source = TraceModel::DataSource::VNA);
 
+    void setTickMaster(YAxis &master) {
+        tickMaster = &master;
+    }
+
     Type getType() const;
 
     bool isSupported(XAxis::Type type, TraceModel::DataSource source);
     static std::set<YAxis::Type> getSupported(XAxis::Type type, TraceModel::DataSource source);
     static std::complex<double> reconstructValueFromYAxisType(std::map<Type, double> yaxistypes);
 
+protected:
+    virtual void updateTicks() override;
+
 private:
     Type type;
+    YAxis *tickMaster; // if set, the tick positions will be set to match if this option is enabled in the preferences and ticks are set to auto
 };
 
 #endif // TRACEAXIS_H

Software/PC_Application/LibreVNA-GUI/Traces/tracexyplot.cpp

@@ -24,6 +24,8 @@ TraceXYPlot::TraceXYPlot(TraceModel &model, QWidget *parent)
 {
     xAxisMode = XAxisMode::UseSpan;
 
+    yAxis[1].setTickMaster(yAxis[0]);
+
     // Setup default axis
     setYAxis(0, YAxis::Type::Magnitude, false, false, -120, 20, 14, true);
     setYAxis(1, YAxis::Type::Phase, false, false, -180, 180, 12, true);

Software/PC_Application/LibreVNA-GUI/preferences.cpp

@@ -286,6 +286,7 @@ void PreferencesDialog::setInitialGUIState()
     ui->GraphsSweepLine->setChecked(p->Graphs.SweepIndicator.line);
     ui->GraphsSweepHide->setChecked(p->Graphs.SweepIndicator.hide);
     ui->GraphsSweepHidePercent->setValue(p->Graphs.SweepIndicator.hidePercent);
+    ui->graphsEnableMasterTicksForYAxis->setChecked(p->Graphs.enableMasterTicksForYAxis);
 
     ui->MarkerShowMarkerData->setChecked(p->Marker.defaultBehavior.showDataOnGraphs);
 
@@ -398,6 +399,7 @@ void PreferencesDialog::updateFromGUI()
     p->Graphs.SweepIndicator.line = ui->GraphsSweepLine->isChecked();
     p->Graphs.SweepIndicator.hide = ui->GraphsSweepHide->isChecked();
     p->Graphs.SweepIndicator.hidePercent = ui->GraphsSweepHidePercent->value();
+    p->Graphs.enableMasterTicksForYAxis = ui->graphsEnableMasterTicksForYAxis->isChecked();
 
     p->Marker.defaultBehavior.showDataOnGraphs = ui->MarkerShowMarkerData->isChecked();
     p->Marker.defaultBehavior.showdB = ui->MarkerShowdB->isChecked();

Software/PC_Application/LibreVNA-GUI/preferences.h

@@ -136,6 +136,8 @@ public:
         bool enablePanAndZoom;
         double zoomFactor;
 
+        bool enableMasterTicksForYAxis;
+
         struct {
             bool triangle;
             int triangleSize;
@@ -258,6 +260,7 @@ private:
         {&Graphs.fontSizeTraceNames, "Graphs.fontSizeTraceNames", 12},
         {&Graphs.enablePanAndZoom, "Graphs.enablePanAndZoom", true},
         {&Graphs.zoomFactor, "Graphs.zoomFactor", 0.9},
+        {&Graphs.enableMasterTicksForYAxis, "Graphs.enableMasterTicksForYAxis", false},
         {&Graphs.SweepIndicator.triangle, "Graphs.SweepIndicator.triangle", true},
         {&Graphs.SweepIndicator.triangleSize, "Graphs.SweepIndicator.triangleSize", 5},
         {&Graphs.SweepIndicator.line, "Graphs.SweepIndicator.line", false},

Software/PC_Application/LibreVNA-GUI/preferencesdialog.ui

@@ -98,7 +98,7 @@
        </size>
       </property>
       <property name="currentIndex">
-       <number>5</number>
+       <number>2</number>
       </property>
       <widget class="QWidget" name="Startup">
        <layout class="QHBoxLayout" name="horizontalLayout_4">
@@ -112,8 +112,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>522</width>
-             <height>914</height>
+             <width>424</width>
+             <height>852</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_13">
@@ -703,8 +703,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>565</width>
-             <height>477</height>
+             <width>450</width>
+             <height>416</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_21">
@@ -944,8 +944,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>553</width>
-             <height>1075</height>
+             <width>679</width>
+             <height>964</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_22">
@@ -1029,6 +1029,13 @@
                 </property>
                </widget>
               </item>
+              <item>
+               <widget class="QCheckBox" name="graphsEnableMasterTicksForYAxis">
+                <property name="text">
+                 <string>Use left Y-axis ticks for right Y-axis ticks in auto mode</string>
+                </property>
+               </widget>
+              </item>
               <item>
                <widget class="QGroupBox" name="groupBox_16">
                 <property name="title">
@@ -1438,8 +1445,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>683</width>
-             <height>605</height>
+             <width>696</width>
+             <height>564</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_7">
@@ -1784,8 +1791,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>697</width>
-             <height>563</height>
+             <width>696</width>
+             <height>564</height>
             </rect>
            </property>
            <layout class="QHBoxLayout" name="horizontalLayout_12">
@@ -2067,8 +2074,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>697</width>
-             <height>563</height>
+             <width>194</width>
+             <height>146</height>
             </rect>
            </property>
            <layout class="QHBoxLayout" name="horizontalLayout_19">