README.md

プロジェクトの構造

ProjectDirectory/
│
├── Main.cpp
├── Common.hpp
├── Title.hpp
├── Title.cpp
├── Game.hpp
└── Game.cpp

Common.hpp

# pragma once
# include <Siv3D.hpp>

using App = SceneManager<String>;

Game.cpp

# include "Game.hpp"

Game::Game(const InitData& init)
	: IScene{ init }
{

}

void Game::update()
{
	if (MouseL.down())
	{
		changeScene(U"Title");
	}
}

void Game::draw() const
{
	Scene::SetBackground(ColorF{ 0.3, 0.4, 0.5 });
}

Game.hpp

# pragma once
# include "Common.hpp"

// ゲームシーン
class Game : public App::Scene
{
public:

	Game(const InitData& init);

	void update() override;

	void draw() const override;
};

Main.cpp

# include <Siv3D.hpp> // Siv3D v0.6.12
# include "Common.hpp"
# include "Title.hpp"
# include "Game.hpp"

void Main()
{
	Window::Resize(1280, 720);
	Window::SetTitle(U"Siv3D Game v1.0");
	Scene::SetBackground(ColorF{ 0.6, 0.8, 0.7 });

	FontAsset::Register(U"Bold", FontMethod::MSDF, 48, Typeface::Bold);

	App manager;
	manager.add<Title>(U"Title");
	manager.add<Game>(U"Game");

	while (System::Update())
	{
		if (not manager.update())
		{
			break;
		}
	}
}

Title.cpp

# include "Title.hpp"

Title::Title(const InitData& init)
	: IScene{ init }
{

}

void Title::update()
{
	if (m_startButton.leftClicked())
	{
		changeScene(U"Game");
	}

	if (m_quitButton.leftClicked())
	{
		System::Exit();
	}
}

void Title::draw() const
{
	Scene::SetBackground(ColorF{ 0.6, 0.8, 0.7 });

	const Font& font = FontAsset(U"Bold");

	font(U"Siv3D Game").drawAt(120, Vec2{ 640, 200 }, ColorF{ 0.96 });

	m_startButton.draw(ColorF{ 0.96 });
	font(U"Start").drawAt(m_startButton.center(), ColorF{ 0.2 });
	if (m_startButton.mouseOver())
	{
		m_startButton.drawFrame(2, 0, ColorF{ 0.2 });
		Cursor::RequestStyle(CursorStyle::Hand);
	}

	m_quitButton.draw(ColorF{ 0.96 });
	font(U"Quit").drawAt(m_quitButton.center(), ColorF{ 0.2 });
	if (m_quitButton.mouseOver())
	{
		m_quitButton.drawFrame(2, 0, ColorF{ 0.2 });
		Cursor::RequestStyle(CursorStyle::Hand);
	}
}

Title.hpp

# pragma once
# include "Common.hpp"

// タイトルシーン
class Title : public App::Scene
{
public:

	Title(const InitData& init);

	void update() override;

	void draw() const override;

private:

	Rect m_startButton{ Arg::center(640, 480), 400, 80 };

	Rect m_quitButton{ Arg::center(640, 580), 400, 80 };
};