ニコニコ生放送にて、30分で作った音楽プレイヤー

Main.cpp

//音楽プレイヤー
# include <Siv3D.hpp>

void Main()
{
    Graphics::SetBackground(Palette::White);

    const Sound sound = Dialog::OpenSound();

    sound.play();

    Circle playButton(Window::Center(), 30);

    Circle sliderToggle(20);

    const Point sliderStartPos{ 100, 100 };

    const Point sliderEndPos{ 540, 100 };

    const Vec2 sliderDelta = sliderEndPos - sliderStartPos;

    bool isDraggingSlider = false;

    while (System::Update())
    {
        if (playButton.leftClicked)
        {
            if (sound.isPlaying)
            {
                sound.pause();
            }
            else
            {
                sound.play();
            }
        }

        if (sliderToggle.leftClicked)
        {
            isDraggingSlider = true;

            sound.pause();
        }

        if (isDraggingSlider)
        {
            const double length = sliderEndPos.x - sliderStartPos.x;

            const double offset = Clamp(static_cast<double>(Mouse::Pos().x - sliderStartPos.x),0.0, length);

            const double value = offset / length;

            sound.setPosSec(value * sound.lengthSec);
        }

        if (Input::MouseL.released)
        {
            isDraggingSlider = false;

            sound.play();
        }

        sliderToggle.setPos((sound.posSec / sound.lengthSec) * sliderDelta + sliderStartPos);

        if (sound.isPlaying)
        {
            Waving::FFT(sound);
        }


        const float* p = Waving::FFTBuffer();

        for (int i = 0; i < 320; ++i)
        {
            RectF(i * 2, Window::Height(), 2, -Pow(p[i], 0.6f) * 1000).draw(HSV(240 - i));
        }


        playButton.draw(playButton.mouseOver ? Palette::Lightcoral : Palette::Gray);

        Line(sliderStartPos, sliderEndPos).draw(10, Palette::Gray);

        sliderToggle.draw(sliderToggle.mouseOver ? Palette::Lightcoral : Palette::Gray);
    }
}