Function drawSpectrumBars

examples/Audio/advanced/advanced.h:182–229

Visualization: Spectrum Bars

// Visualization: Spectrum Bars
void drawSpectrumBars(fl::audio::fft::Bins* fft, float /* peak */) {
    clearDisplay();
    fl::CRGBPalette16 palette = getCurrentPalette();
    
    int barWidth = WIDTH / NUM_BANDS;

    auto bands = fft->db();
    
    for (size_t band = 0; band < NUM_BANDS && band < bands.size(); band++) {
        float magnitude = bands[band];
        
        // Apply noise floor
        magnitude = magnitude / 100.0f;  // Normalize from dB
        magnitude = fl::max(0.0f, magnitude - noiseFloor.value());
        
        // Smooth the FFT
        fftSmooth[band] = fftSmooth[band] * 0.8f + magnitude * 0.2f;
        magnitude = fftSmooth[band];
        
        // Apply gain
        magnitude *= audioGain.value() * autoGainValue;
        magnitude = fl::clamp(magnitude, 0.0f, 1.0f);
        
        int barHeight = magnitude * HEIGHT;
        int xStart = band * barWidth;
        
        for (int x = 0; x < fl::max(barWidth, 1); x++) {
            for (int y = 0; y < barHeight; y++) {
                uint8_t colorIndex = fl::map_range<float, uint8_t>(
                    float(y) / HEIGHT, 0, 1, 0, 255
                );
                fl::CRGB color = ColorFromPalette(palette, colorIndex + hue);
                
                int ledIndex = xyMap(xStart + x, y);
                if (ledIndex >= 0 && ledIndex < NUM_LEDS) {
                    leds[ledIndex] = color;
                }
                
                if (mirrorMode) {
                    int mirrorIndex = xyMap(WIDTH - 1 - (xStart + x), y);
                    if (mirrorIndex >= 0 && mirrorIndex < NUM_LEDS) {
                        leds[mirrorIndex] = color;
                    }
                }
            }
        }
    }
}

// Visualization: Radial Spectrum
void drawRadialSpectrum(fl::audio::fft::Bins* fft, float /* peak */) {