horizont/Source/SpectrumDisplay.h

#pragma once

#include <JuceHeader.h>

#include <array>

#include "PluginProcessor.h"

class SpectrumDisplay : public juce::Component, private juce::Timer
{
public:
    explicit SpectrumDisplay (HorizontAudioProcessor&);
    ~SpectrumDisplay() override;

    void paint (juce::Graphics&) override;
    void setScaleFactor (float scale);

private:
    void timerCallback() override;

    HorizontAudioProcessor& processor;

    static constexpr int fftOrder = 10;
    static constexpr int fftSize = 1 << fftOrder;
    static constexpr int numBins = 48;

    void computeLevels (const float* samples, int got, std::array<float, numBins>& out);
    juce::Path makeCurve (const juce::Rectangle<float>& graph, const std::array<float, numBins>& data) const;

    juce::dsp::FFT fft { fftOrder };
    std::vector<float> fftData = std::vector<float> (2 * fftSize, 0.0f);
    std::vector<float> window;
    std::array<float, numBins> level {};
    std::array<float, numBins> display {};
    std::array<float, numBins> peak {};
    std::array<float, numBins> dryLevel {};
    std::array<float, numBins> dryDisplay {};
    std::array<float, numBins> dryPeak {};

    float scaleFactor = 1.0f;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SpectrumDisplay)
};