４０行でライフゲーム

ニコニコ生放送「寝ながらライフゲームつくる」にて

Main

# include <Siv3D.hpp>

void Main()
{
	const Point size = Window::Size();
	Image image(size.x, size.y);
	DynamicTexture tex;

	std::array<std::vector<bool>, 2> worlds;
	const int num = size.x*size.y;
	worlds[0].resize(num);
	worlds[1].resize(num);

	std::array<Point, 8> neighbors = { { { -1, -1 }, { 0, -1 }, { 1, -1 }, { -1, 0 }, { 1, 0 }, { -1, 1 }, { 0, 1 }, { 1, 1 } } };
	std::array<bool, 9> boneRule = { false, false, false, true, false, false, false, false, false };
	std::array<bool, 9> surviveRule = { false, false, true, true, false, false, false, false, false };
	std::array<std::array<bool, 9>, 2> rule = { boneRule, surviveRule };
	
	while (System::Update())
	{
		if (Input::MouseL.clicked)
			for (int y = 1; y < size.y - 1; ++y)
				for (int x = 1; x < size.x - 1; ++x)
					worlds[0][y*size.x + x] = RandomBool(0.5);

		//update
		for (int y = 1; y < size.y - 1; ++y)
			for (int x = 1; x < size.x - 1; ++x)
				worlds[1][y*size.x + x] = rule[worlds[0][y*size.x + x]][std::count_if(neighbors.begin(), neighbors.end(), [&](const Point& v){return worlds[0][(v.y + y)*size.x + (v.x + x)]; })];

		worlds[0].swap(worlds[1]);		

		//draw
		for (int y = 1; y < size.y - 1; ++y)
			for (int x = 1; x < size.x - 1; ++x)
				image[y][x] = ColorF(0.0, worlds[0][y*size.x + x], 0.0);

		tex.tryFill(image);
		tex.draw();
	}
}