オーディオスペクトラム

# include <Siv3D.hpp>

void Main()
{
    const Sound sound = Dialog::OpenSound();

    sound.play();

    while (System::Update())
    {
        const auto fft = FFT::Analyze(sound);

        for (auto i : step(320))
        {
            RectF(i * 2, Window::Height(), 2, -Pow(fft.buffer[i], 0.6) * 1000).draw(HSV(240 - i));
        }
    }
}