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);
	}
}