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A free C++ library for games and interactive media

Siv3D is a C++ library for games and interactive media. It supports many input devices such as Kinect, Leap Motion, webcams and microphones, and complex interactions can be coded in a few lines.

Small, Modern, Functional

The best tool to enjoy application development.

SMALL CODE

数行～数十行のコードでインタラクティブなアプリケーションを開発できます。短時間で結果が得られるため、大学や専門学校のプログラミング教育でも活用されています。

IMAGE & AUDIO PROCESSING

音楽の再生や画像の表示、テンポやピッチの変更、波形編集、画像加工、AR マーカーの検出、Twitter への画像投稿といった様々な処理を易しいコードで実現します。

SUPPORTS 10+ INPUT DEVICES

Kinect, Leap Motion, マイク、Web カメラ、ペンタブ、ゲームコントローラ、マルチタッチ、Arduino など、10 種類以上の入力機器を、2, 3 行のコードの追加で活用できます。

STATE OF THE ART C++

すべてのコードが最新の C++11/14 規格で書かれているため、Siv3D を使うことで新しい C++ の書き方を学習できます。(最新の C++ について知りたい方は [こちら](http://www.slideshare.net/Reputeless/c11c14))

The shortest distance to completion

洗練されたコードで、あらゆるアイデアを明快に表現します。

Shape and text
```cpp # include

void Main() { const Font font(30);

while (System::Update())
{
    Circle(Mouse::Pos(), 100).draw();

    font(Mouse::Pos()).draw(50, 200, Palette::Orange);
}

}

<img src="https://github.com/Siv3D/Reference-JP/blob/master/resource/siv3d/top2.gif?raw=true" width="320" height="240" align="left">
Paint<br clear="left">
```cpp
# include <Siv3D.hpp>

void Main()
{
	Image image(Window::Size(), Palette::White);

	DynamicTexture texture(image);

	while (System::Update())
	{
		if (Input::MouseL.pressed)
		{
			Line(Mouse::PreviousPos(), Mouse::Pos()).overwrite(image, 8, Palette::Orange);

			texture.fill(image);
		}

		texture.draw();
	}
}

Breakout
```cpp # include

void Main() { const Size blockSize(40, 20); const double speed = 8.0; Rect wall(60, 10); Circle ball(320, 400, 8); Vec2 ballSpeed(0, -speed);

Array<Rect> blocks;
for (auto p : step({ Window::Width() / blockSize.x , 5 }))
{
	blocks.emplace_back((p*blockSize).moveBy(0, 60), blockSize);
}

while (System::Update())
{
	ball.moveBy(ballSpeed);
	wall.setCenter(Mouse::Pos().x, 420);

	for (auto it = blocks.begin(); it != blocks.end(); ++it)
	{
		if (it->intersects(ball))
		{
			(it->bottom.intersects(ball) || it->top.intersects(ball)
				? ballSpeed.y : ballSpeed.x) *= -1;

			blocks.erase(it);
			break;
		}
	}

	for (auto const& block : blocks)
	{
		block.stretched(-1).draw(HSV(block.y - 40));
	}

	if (ball.y < 0 && ballSpeed.y <  0)
	{
		ballSpeed.y *= -1;
	}

	if ((ball.x < 0 && ballSpeed.x < 0) || (Window::Width() < ball.x && ballSpeed.x > 0))
	{
		ballSpeed.x *= -1;
	}

	if (ballSpeed.y > 0 && wall.intersects(ball))
	{
		ballSpeed = Vec2((ball.x - wall.center.x) / 8, -ballSpeed.y).setLength(speed);
	}

	ball.draw();
	wall.draw();
}

}

<img src="https://github.com/Siv3D/Reference-JP/blob/master/resource/siv3d/top4.gif?raw=true" width="320" height="240" align="left">
Kaleidoscope<br clear="left">
```cpp
# include <Siv3D.hpp>

void Main()
{
	const int32 N = 12;

	Image image(Window::Size(), Color(20, 40, 60));

	DynamicTexture texture(image);

	Mouse::SetTransform(Mat3x2::Translate(Window::Center()));

	while (System::Update())
	{
		if (Input::MouseL.pressed)
		{
			for (auto i : step(N))
			{
				Circular cs[2] = { Input::MouseL.clicked ? Mouse::Pos() : Mouse::PreviousPos(), Mouse::Pos() };

				for (auto& c : cs)
				{
					c.theta = i % 2 ? -c.theta - TwoPi / N * (i - 1) : c.theta + TwoPi / N * i;
				}

				Line(cs[0], cs[1]).moveBy(Window::Center()).overwrite(image, 2, HSV(System::FrameCount(), 0.5, 1.0));
			}

			texture.tryFill(image);
		}
		else if (Input::MouseR.clicked)
		{
			image.fill(Color(20, 40, 60));

			texture.fill(image);
		}

		texture.draw();
	}
}

Face detection
Illustration by [古古米](http://www.pixiv.net/member.php?id=583587) ```cpp # include

void Main() { Texture texture;

Array<Rect> faces;

while (System::Update())
{
	if (Dragdrop::HasItems())
	{
		if (Image image{ Dragdrop::GetFilePaths()[0] })
		{
			faces = Imaging::DetectFaces(image, CascadeType::Anime);

			texture = Texture(image);

			Window::Resize(texture.size);
		}
	}

	texture.draw();

	const double a = Sin(Time::GetMillisec() * 0.005) * 0.5 + 0.5;

	for (const auto& face : faces)
	{
		face.drawFrame(3, 3, ColorF(Palette::Red, a));
	}
}

}

<img src="https://github.com/Siv3D/Reference-JP/blob/master/resource/siv3d/top6.gif?raw=true" width="320" height="240" align="left">
Audio spectrum<br clear="left">
```cpp
# include <Siv3D.hpp>

void Main()
{
	const Sound sound = Dialog::OpenSound();

	sound.play();

	while (System::Update())
	{
		const auto fft = FFT::Analyze(sound);

		for (auto i : step(320))
		{
			RectF(i * 2, Window::Height(), 2, -Pow(fft.buffer[i], 0.6) * 1000).draw(HSV(240 - i));
		}
	}
}

Kinect
```cpp # include

void Main() { KinectV2::Start();

DynamicTexture depthTexture;

std::array<Optional<KinectV2Body>, 6> bodies;

while (System::Update())
{
	if (KinectV2::HasNewDepthFrame())
	{
		KinectV2::GetDepthFrame(depthTexture);
	}

	if (KinectV2::HasNewBodyFrame())
	{
		KinectV2::GetBodyFrame(bodies);
	}

	depthTexture.draw();

	for (const auto& body : bodies)
	{
		if (body)
		{
			for (const auto& joint : body->joints)
			{
				Circle(joint.depthSpacePos, 15).drawFrame(6.0, 0.0, Palette::Red);
			}
		}
	}
}

}

<img src="https://github.com/Siv3D/Reference-JP/blob/master/resource/siv3d/top8.gif?raw=true" width="320" height="240" align="left">
Earth<br clear="left">
```cpp
# include <Siv3D.hpp>

void Main()
{
	const Texture texture(L"Example/Earth.jpg", TextureDesc::For3D);

	while (System::Update())
	{
		Graphics3D::FreeCamera();

		const double yaw = Time::GetMillisec() * -0.0001;

		Sphere(10, Quaternion::Yaw(yaw).roll(-23.4_deg)).draw(texture);
	}
}