global peak label moved to the spectrogram

src/ui/Application.cpp

@@ -797,14 +797,6 @@ void Application::renderControlPanel() {
     ImGui::TextDisabled("Mode: %s", settings_.isIQ ? "I/Q"
                         : (settings_.numChannels > 1 ? "Multi-ch" : "Real"));
 
-    int pkCh2 = std::clamp(waterfallChannel_, 0, analyzer_.numSpectra() - 1);
-    auto [peakBin, peakDB] = analyzer_.findPeak(pkCh2);
-    double peakFreq = analyzer_.binToFreq(peakBin);
-    {
-        char peakBuf[128];
-        fmtFreqDB(peakBuf, sizeof(peakBuf), "Peak", peakFreq, peakDB);
-        ImGui::TextDisabled("%s", peakBuf);
-    }
 }
 
 void Application::renderSpectrumPanel() {

src/ui/Cursors.cpp

@@ -123,7 +123,7 @@ void Cursors::draw(const SpectrumDisplay& specDisplay,
         fmtFreqDB(deltaBuf, sizeof(deltaBuf), "D", dFreq, dDB);
 
         ImVec2 dSz = ImGui::CalcTextSize(deltaBuf);
-        float tx = posX + sizeX - dSz.x - 178;
+        float tx = posX + sizeX - dSz.x - 168;
         float lineH = ImGui::GetTextLineHeight();
         float ty = posY + 4;
         ImU32 col = IM_COL32(255, 200, 100, 255);

src/ui/Measurements.cpp

@@ -63,6 +63,15 @@ void Measurements::findPeaks(const std::vector<float>& spectrumDB, int maxN,
 
 void Measurements::update(const std::vector<float>& spectrumDB,
                            double sampleRate, bool isIQ, int fftSize) {
+    // Always track global peak (for the readout label).
+    if (!spectrumDB.empty()) {
+        auto it = std::max_element(spectrumDB.begin(), spectrumDB.end());
+        int bin = static_cast<int>(std::distance(spectrumDB.begin(), it));
+        globalPeak_.bin = bin;
+        globalPeak_.dB = *it;
+        globalPeak_.freq = binToFreq(bin, sampleRate, isIQ, fftSize);
+    }
+
     if (!enabled) { peaks_.clear(); return; }
 
     findPeaks(spectrumDB, maxPeaks, minPeakDist, peakThreshold);
@@ -78,6 +87,16 @@ void Measurements::draw(const SpectrumDisplay& specDisplay,
                          double sampleRate, bool isIQ, FreqScale freqScale,
                          float minDB, float maxDB,
                          float viewLo, float viewHi) const {
+    // Global peak readout (always shown, left of cursor delta)
+    {
+        char pkBuf[128];
+        fmtFreqDB(pkBuf, sizeof(pkBuf), "Peak", globalPeak_.freq, globalPeak_.dB);
+        ImVec2 pkSz = ImGui::CalcTextSize(pkBuf);
+        float pkX = posX + sizeX - pkSz.x - 8 - 350;
+        float pkY = posY + 4;
+        ImGui::GetWindowDrawList()->AddText({pkX, pkY}, IM_COL32(180, 180, 200, 200), pkBuf);
+    }
+
     if (!enabled || !showOnSpectrum || peaks_.empty()) return;
 
     ImDrawList* dl = ImGui::GetWindowDrawList();

src/ui/Measurements.h

@@ -46,6 +46,7 @@ public:
     bool showOnWaterfall = false; // draw vertical lines on waterfall
 
 private:
+    PeakInfo globalPeak_;             // always-tracked highest peak
     std::vector<PeakInfo> peaks_;
 
     // Find top-N peaks with minimum bin separation.