音楽プレイヤー

# include <Siv3D.hpp>

class SoundPlayer
{
private:

    GUI m_gui;

    Sound m_sound;

public:

    SoundPlayer()
        : m_gui(GUIStyle::Default)
    {
        m_gui.add(L"PlayButton", GUIButton::Create(L"Play"));

        m_gui.add(L"PauseButton", GUIButton::Create(L"Pause"));

        m_gui.addln(L"OpenButton", GUIButton::Create(L"Open"));

        m_gui.add(L"Slider", GUISlider::Create(0.0, 1.0, 0.0, 500));

        m_gui.setPos((Window::Width() - m_gui.getRect().w) / 2, 360);
    }

    void update()
    {
        m_gui.button(L"PlayButton").enabled = (m_sound && !m_sound.isPlaying());

        m_gui.button(L"PauseButton").enabled = m_sound.isPlaying();

        if (m_gui.button(L"PlayButton").pushed)
        {
            m_sound.play();
        }
        else if (m_gui.button(L"PauseButton").pushed)
        {
            m_sound.pause();
        }
        else if (m_gui.button(L"OpenButton").pushed)
        {
            m_sound.pause();

            m_sound = Dialog::OpenSound();
        }

        if (m_gui.slider(L"Slider").hasChanged)
        {
            m_sound.setPosSec(m_sound.lengthSec() * m_gui.slider(L"Slider").value);
        }

        m_gui.slider(L"Slider").setValue(m_sound.streamPosSec() / m_sound.lengthSec());
    }

    void drawVisualizer() const
    {
        if (!m_sound.isPlaying())
        {
            return;
        }

        const auto fft = FFT::Analyze(m_sound);

        for (int32 i = 0; i < 640; ++i)
        {
            const double size = Pow(fft.buffer[i], 0.6) * 500;

            RectF(i, 200 + size, 1, -size * 2).draw(HSV(240 - i));
        }
    }
};

void Main()
{
    Graphics::SetBackground(Color(70, 80, 170));

    SoundPlayer soundPlayer;

    while (System::Update())
    {
        soundPlayer.update();

        soundPlayer.drawVisualizer();
    }
}