44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
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#pragma once
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#include <cmath>
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#include <complex.h>
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#include <gtkmm.h>
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#include <iostream>
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#include <string>
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#include <utility>
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#include <vector>
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class FFTRenderer {
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public:
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double centerFrequency = 2.4e9;
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double bandwidth = 28e6;
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double sampleRate = 36e6;
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double zoom = 1;
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double offset = 0;
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int viewWidth = 1000;
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double minAmplitude = -180;
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double maxAmplitude = -20;
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int viewHeight = 500;
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inline double GetStartFrequencyOff() const {
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return offset - (GetFrequencySpan() / 2);
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};
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inline double GetFrequencySpan() const { return bandwidth / zoom; };
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inline double GetEndFrequencyOff() const {
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return offset + (GetFrequencySpan() / 2);
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};
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const double min_db = -240; // minimum to use if ampltitude==0
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// Apply peak detection to fit FFT to view window; and convert to a power in
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// dB
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// fftData must have 0Hz in the centre
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void FitFFTToView(double maxValue, double refLevel,
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const _Complex double *fftData, int fftLen,
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std::vector<double> &out);
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// Render FFT to the cairo context
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void RenderToContext(std::vector<double> points,
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const Cairo::RefPtr<Cairo::Context> &cr);
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};
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