# include <Siv3D.hpp>


struct PhigrosEffect : IEffect
{
	struct Particle
	{
		Vec2 start;

		Vec2 velocity;

		double alpha;
	};
	Array<Particle> m_particles;
	Vec2 center;
	explicit PhigrosEffect(const Vec2& start)
		: m_particles(Random(1, 4)),
		  center(start)
	{
		for (auto& particle : m_particles)
		{
			const Vec2 vec = RandomVec2(40.0);
			particle.start = start + vec;

			particle.velocity = vec*Random(0.5,1.0);

			particle.alpha = Random(0.4, 1.0);
		}
	}

	bool update(double t) override
	{
		t *= 1.5;
		for (const auto& particle : m_particles)
		{
			const Vec2 pos = particle.start
				+ particle.velocity*EaseOutQuad(t);

			RectF{ pos, 10.0 }.draw(ColorF(1,1,0.7,particle.alpha*(1-EaseInQuad(t))));
		}
		RectF{ Arg::center(center),40 + EaseOutExpo(t) * 25 }.drawFrame(2, ColorF(1, 1, 0.7, 1 - EaseInQuad(t)));
		RectF{ Arg::center(center),40 + EaseOutExpo(t) * 25 }.rotated(45_deg).drawFrame(1, ColorF(1, 1, 0.7, 0.5 - EaseInQuad(t) * 0.5));
		RectF{ Arg::center(center),40 + EaseOutQuart(t) * 25 }.rotated(45_deg).drawFrame(1, ColorF(1, 1, 0.7, 0.5 - EaseInQuad(t) * 0.5));
		RectF{ Arg::center(center),40 + EaseOutSine(t) * 25 }.rotated(45_deg).drawFrame(1, ColorF(1, 1, 0.7, 0.5 - EaseInQuad(t) * 0.5));
		Circle{ Arg::center(center),10 - EaseOutCubic(t) * 7 }.draw(ColorF(1, 1, 0.7, 1 - EaseInQuad(t)));
		Circle{ Arg::center(center),10  }.draw(ColorF(1, 1, 0.7, 0.5 - EaseInQuad(t) * 0.5));
		Circle{ Arg::center(center),30 }.drawArc(180_deg + t * 20_deg, 75_deg, 2.0, 0.0, ColorF(1, 1, 0.7, 1 - EaseInQuad(t)));
		Circle{ Arg::center(center),30 }.drawArc(t * 20_deg, 75_deg, 2.0, 0.0, ColorF(1, 1, 0.7, 1 - EaseInQuad(t)));
		return (t < 1.0);
	}
};

void Main()
{
	Effect effect;

	while (System::Update())
	{
		if (MouseL.down())
		{
			effect.add<PhigrosEffect>(Cursor::Pos());
		}

		effect.update();
	}
}