Function drawPlasmaWave

examples/Audio/advanced/advanced.h:432–455

Visualization: Plasma Wave

// Visualization: Plasma Wave
void drawPlasmaWave(float peak) {
    static float time = 0; // okay static in header
    time += 0.05f + (peak * 0.2f);

    fl::CRGBPalette16 palette = getCurrentPalette();
    
    for (int x = 0; x < WIDTH; x++) {
        for (int y = 0; y < HEIGHT; y++) {
            float value = fl::sinf(x * 0.1f + time) +
                         fl::sinf(y * 0.1f - time) +
                         fl::sinf((x + y) * 0.1f + time) +
                         fl::sinf(fl::sqrtf(x * x + y * y) * 0.1f - time);
            
            value = (value + 4) / 8;  // Normalize to 0-1
            value *= audioGain.value() * autoGainValue;
            
            uint8_t colorIndex = value * 255;
            int ledIndex = xyMap(x, y);
            if (ledIndex >= 0 && ledIndex < NUM_LEDS) {
                leds[ledIndex] = ColorFromPalette(palette, colorIndex + hue);
            }
        }
    }
}

void setup() {
    Serial.begin(115200);