Scope: added magnitude squared (linear power) display overlays

plugins/channelrx/chanalyzer/readme.md

@@ -269,6 +269,10 @@ The signal is synchronized with the PLL in 4 phase mode (locker icon is green).
   
 ![Channel Analyzer NG plugin scope1 controls](../../../doc/img/ChAnalyzerNG_plugin_overlay_dB.png)
 
+**Note3**: in the MagSq mode when the trace is selected (1) the display overlay on the top right of the trace shows 2 figures in scientific notation. From left to right: peak power and average power.
+  
+![Channel Analyzer NG plugin scope2 controls](../../../doc/img/ChAnalyzerNG_plugin_overlay_lin.png)
+
 <h3>5. Source select</h3>
 
 This is for future use when more than one incoming complex signals can be applied. The signal index appears on the right of the button

sdrgui/dsp/scopevisng.cpp

@@ -465,8 +465,36 @@ int ScopeVisNG::processTraces(const SampleVector::const_iterator& cbegin, const
                 }
                 else if (projectionType == Projector::ProjectionMagSq)
                 {
-                    v = ((*itCtl)->m_projector.run(*begin) - itData->m_ofs)*itData->m_amp - 1.0f;
-                    // TODO: power display overlay for squared magnitude
+                    Real magsq = (*itCtl)->m_projector.run(*begin);
+                    v = (magsq - itData->m_ofs)*itData->m_amp - 1.0f;
+
+                    if ((traceCount >= shift) && (traceCount < shift+length)) // power display overlay values construction
+                    {
+                        if (traceCount == shift)
+                        {
+                            (*itCtl)->m_maxPow = 0.0f;
+                            (*itCtl)->m_sumPow = 0.0f;
+                            (*itCtl)->m_nbPow = 1;
+                        }
+
+                        if (magsq > 0.0f)
+                        {
+                            if (magsq > (*itCtl)->m_maxPow)
+                            {
+                                (*itCtl)->m_maxPow = magsq;
+                            }
+
+                            (*itCtl)->m_sumPow += magsq;
+                            (*itCtl)->m_nbPow++;
+                        }
+                    }
+
+                    if ((m_nbSamples == 1) && ((*itCtl)->m_nbPow > 0)) // on last sample create power display overlay
+                    {
+                        double avgPow = (*itCtl)->m_sumPow / (*itCtl)->m_nbPow;
+                        itData->m_textOverlay = QString("%1  %2").arg((*itCtl)->m_maxPow, 0, 'e', 2).arg(avgPow, 0, 'e', 2);
+                        (*itCtl)->m_nbPow = 0;
+                    }
                 }
                 else if (projectionType == Projector::ProjectionMagDB)
                 {

sdrgui/gui/glscopenggui.cpp

@@ -1217,7 +1217,7 @@ void GLScopeNGGUI::disableLiveMode(bool disable)
 void GLScopeNGGUI::fillTraceData(ScopeVisNG::TraceData& traceData)
 {
     traceData.m_projectionType = (Projector::ProjectionType) ui->traceMode->currentIndex();
-    traceData.m_hasTextOverlay = (traceData.m_projectionType == Projector::ProjectionMagDB);
+    traceData.m_hasTextOverlay = (traceData.m_projectionType == Projector::ProjectionMagDB) || (traceData.m_projectionType == Projector::ProjectionMagSq);
     traceData.m_textOverlay.clear();
     traceData.m_inputIndex = 0;
     traceData.m_amp = 0.2 / amps[ui->amp->value()];