initial commit

src/ui/SpectrumDisplay.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include "core/Types.h"
+#include <imgui.h>
+#include <vector>
+
+namespace baudline {
+
+struct ChannelStyle {
+    ImU32 lineColor;
+    ImU32 fillColor;
+};
+
+class SpectrumDisplay {
+public:
+    // Draw multiple channel spectra overlaid.
+    // `spectra` has one entry per channel; `styles` has matching colors.
+    void draw(const std::vector<std::vector<float>>& spectra,
+              const std::vector<ChannelStyle>& styles,
+              float minDB, float maxDB,
+              double sampleRate, bool isIQ,
+              FreqScale freqScale,
+              float posX, float posY, float sizeX, float sizeY) const;
+
+    // Convenience: single-channel draw (backward compat).
+    void draw(const std::vector<float>& spectrumDB,
+              float minDB, float maxDB,
+              double sampleRate, bool isIQ,
+              FreqScale freqScale,
+              float posX, float posY, float sizeX, float sizeY) const;
+
+    double screenXToFreq(float screenX, float posX, float sizeX,
+                         double sampleRate, bool isIQ, FreqScale freqScale) const;
+    float freqToScreenX(double freq, float posX, float sizeX,
+                        double sampleRate, bool isIQ, FreqScale freqScale) const;
+    float screenYToDB(float screenY, float posY, float sizeY,
+                      float minDB, float maxDB) const;
+
+    bool showGrid = true;
+    bool fillSpectrum = false;
+};
+
+} // namespace baudline