Main.cpp

# include <Siv3D.hpp>
# include <HamFramework.hpp>

struct CommonData
{
	int counter = 0;
	int score = 0;
	// 大きさ 30 のフォントを用意
	Font font{30};
};

using MyApp = SceneManager<String, CommonData>;

class Title : public MyApp::Scene
{
public:

	void update() override
	{
		if (Input::MouseL.clicked)
		{
			++m_data->counter;
			changeScene(L"Game");
		}
	}

	void draw() const override
	{
		Window::ClientRect().draw(Palette::Blue);
		m_data->font(L"TITLE").drawCenter(Window::Center());
	}
};

class Game : public MyApp::Scene
{
public:
	const Sound m_sound{ Wave(0.1s, [](double t) { return Fraction(t * 1760)*0.5 - 0.25; }) }; // ラムダ式
	const Point m_blockSize{ 40, 20 };
	const double m_speed = 8.0;
	Rect m_wall{ 60, 10 };
	Circle m_ball{ 320, 400, 8 };
	Vec2 m_ballSpeed{ 0, -m_speed };

	Array<Rect> m_blocks;

	void init() override
	{
		for (auto p : step({ Window::Width() / m_blockSize.x , 5 }))
		{
			m_blocks.emplace_back((p*m_blockSize).moveBy(0, 60), m_blockSize); // 参照で追加
		}
	}

	void update() override
	{
		m_ball.moveBy(m_ballSpeed);
		m_wall.setCenter(Mouse::Pos().x, 420);

		for (auto it = m_blocks.begin(); it != m_blocks.end(); ++it) // イテレータ(iterator)
		{
			if (it->intersects(m_ball)) // 当たり判定
			{
				(it->bottom.intersects(m_ball) || it->top.intersects(m_ball) // 移動方向を逆に(反発)
					? m_ballSpeed.y : m_ballSpeed.x) *= -1;

				m_blocks.erase(it); // ブロックを消す
				m_data->score++;
				m_sound.playMulti(); // 
				break;
			}
		}

		for (auto const& block : m_blocks)
		{
			block.stretched(-1).draw(HSV(block.y - 40)); // x,y両軸方向に1pxずつ縮めて表示
		}

		if (m_ball.y < 0 && m_ballSpeed.y < 0) // 上の壁
		{
			m_ballSpeed.y *= -1;
		}

		if ((m_ball.x < 0 && m_ballSpeed.x < 0) || (Window::Width() < m_ball.x && m_ballSpeed.x > 0)) // 左右
		{
			m_ballSpeed.x *= -1;
		}

		if (m_ballSpeed.y > 0 && m_wall.intersects(m_ball)) // バーとの衝突
		{
			m_ballSpeed = Vec2((m_ball.x - m_wall.center.x) / 8, -m_ballSpeed.y).setLength(m_speed);
		}

		if (m_ball.y > Window::Height() && m_ballSpeed.y > 0) // 下の壁
		{
			++m_data->counter;
			changeScene(L"Result");
		}
	}

	void draw() const override
	{
		m_ball.draw();
		m_wall.draw();
		m_data->font(L"スコア: ", m_data->score).drawCenter(Window::Center());
	}
};

class Result : public MyApp::Scene
{
public:

	void update() override
	{
		if (Input::MouseL.clicked)
		{
			++m_data->counter;
			changeScene(L"Title");
		}
	}

	void draw() const override
	{
		Window::ClientRect().draw(Palette::Green);
		m_data->font(L"RESULT:", m_data->score).drawCenter(Window::Center());
	}
};

void Main()
{
	MyApp manager;

	manager.add<Title>(L"Title");
	manager.add<Game>(L"Game");
	manager.add<Result>(L"Result");

	while (System::Update())
	{
		manager.updateAndDraw();
	}
}