initial commit

src/ui/Cursors.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "core/Types.h"
+#include "ui/SpectrumDisplay.h"
+#include <vector>
+
+namespace baudline {
+
+struct CursorInfo {
+    bool   active = false;
+    double freq   = 0.0;     // Hz
+    float  dB     = -200.0f;
+    int    bin    = 0;
+};
+
+class Cursors {
+public:
+    // Update cursor positions from mouse input and spectrum data.
+    void update(const std::vector<float>& spectrumDB,
+                double sampleRate, bool isIQ, int fftSize);
+
+    // Draw cursor overlays on the spectrum display area.
+    void draw(const SpectrumDisplay& specDisplay,
+              float posX, float posY, float sizeX, float sizeY,
+              double sampleRate, bool isIQ, FreqScale freqScale,
+              float minDB, float maxDB) const;
+
+    // Draw cursor readout panel (ImGui widgets).
+    void drawPanel() const;
+
+    // Set cursor A/B positions from mouse click.
+    void setCursorA(double freq, float dB, int bin);
+    void setCursorB(double freq, float dB, int bin);
+
+    // Auto-find peak and set cursor to it.
+    void snapToPeak(const std::vector<float>& spectrumDB,
+                    double sampleRate, bool isIQ, int fftSize);
+
+    // Find peak near a given bin (within a window).
+    int findLocalPeak(const std::vector<float>& spectrumDB,
+                      int centerBin, int window = 20) const;
+
+    CursorInfo cursorA;
+    CursorInfo cursorB;
+    bool       showDelta = true;
+
+    // Hover cursor (follows mouse, always active)
+    CursorInfo hover;
+};
+
+} // namespace baudline