FreeCanera.cpp

//--------------------------------------------------------------------------
//
//	This is free and unencumbered software released into the public domain.
//
//--------------------------------------------------------------------------
# include <Siv3D.hpp> // November 2014 v2

class CameraManager
{
public:

	void freeCamera(double speed)
	{
		const double move = speed * (Input::KeyControl.pressed ? 20.0 : Input::KeyShift.pressed ? 5.0 : 1.0);

		if (Input::KeyLeft.pressed)
		{
			r -= 1.0;
			if (r < 0.0) r += 360.0;
		}

		if (Input::KeyRight.pressed)
		{
			r += 1.0;
			if (r > 360.0) r -= 360.0;
		}

		const double rad = Math::Radians(r);
		const double xr = Math::Sin(rad);
		const double zr = Math::Cos(rad);

		if (Input::KeyW.pressed)
		{
			state.pos.x += move * xr;
			state.pos.z += move * zr;
		}

		if (Input::KeyS.pressed)
		{
			state.pos.x -= move * xr;
			state.pos.z -= move * zr;
		}

		if (Input::KeyA.pressed)
		{
			state.pos.x -= move * zr;
			state.pos.z += move * xr;
		}

		if (Input::KeyD.pressed)
		{
			state.pos.x += move * zr;
			state.pos.z -= move * xr;
		}

		if (Input::KeyUp.pressed)
		{
			state.lookat.y += 0.5;
		}

		if (Input::KeyDown.pressed)
		{
			state.lookat.y -= 0.5;
		}

		if (Input::KeyE.pressed)
		{
			state.pos.y += move;
			state.lookat.y += move;
		}

		if (Input::KeyX.pressed)
		{
			state.pos.y -= move;
			state.lookat.y -= move;
		}

		state.lookat.x = state.pos.x + 24.0 * xr;
		state.lookat.z = state.pos.z + 24.0 * zr;

		Graphics3D::SetCamera(state);
	}

private:

	Camera state = Graphics3D::GetCamera();

	double r = 0.0;
};

void Main()
{
	CameraManager cam;

	while (System::Update())
	{
		cam.freeCamera(0.1);

		Plane(100).draw();

		Sphere(3).draw();
	}
}