danmaku_generator

main.cpp

#include <Siv3D.hpp>
#include <deque>
using namespace std;

class Bullet {
public:
	Bullet(Vec2 pos, Vec2 vec, Color color): pos(pos), vec(vec), color(color) {}

	void move() {
		pos += vec;
		if (pos.x < 0.0 || pos.x > Window::Width() || pos.y < 0.0 || pos.y > Window::Height()) {
			enabled = false;
		}
	}

	void draw() {
		Circle(pos, 5.0).draw(color);
	}

	bool isEnabled() { return enabled; }
private:
	Vec2 pos, vec;
	Color color;
	bool enabled = true;
};

void Main()
{
	deque<Bullet> bullets;
	Vec2 pos(320, 240);

	double sp = 2.0;
	double turnAngle = 3.0;
	int interval = 3;
	int sep = 5;
	double hue = 0.0;

	GUI gui(GUIStyle::Default);
	gui.addln(GUIText::Create(L"bulletSpeed"));
	gui.addln(L"speed", GUISlider::Create(1.0, 10.0, sp, 200));
	gui.addln(GUIText::Create(L"turnSpeed"));
	gui.addln(L"turnAngle", GUISlider::Create(-5.0, 5.0, turnAngle, 200));
	gui.addln(GUIText::Create(L"interval"));
	gui.addln(L"interval", GUISlider::Create(1.0, 10.0, 3.0, 200));
	gui.addln(GUIText::Create(L"separate"));
	gui.addln(L"separate", GUISlider::Create(3.0, 20.0, 5.0, 200));
	gui.addln(GUIText::Create(L"color"));
	gui.addln(L"color", GUISlider::Create(0.0, 360.0, hue, 200));
	gui.addln(L"blend", GUICheckBox::Create({ L"addBlend" }));

	while (System::Update()) {
		const int cnt = System::FrameCount();

		sp = gui.slider(L"speed").value;
		turnAngle = gui.slider(L"turnAngle").value;
		interval = gui.slider(L"interval").valueInt;
		sep = gui.slider(L"separate").valueInt;
		hue = gui.slider(L"color").value;
		if (gui.checkBox(L"blend").checked(0)) {
			Graphics2D::SetBlendState(BlendState::Additive);
		} else {
			Graphics2D::SetBlendState(BlendState::Default);
		}

		if (Input::KeySpace.clicked) gui.show(!gui.style.visible);
		if (Input::KeyC.clicked) bullets.clear();
		if (Input::MouseR.pressed) pos = Mouse::Pos();

		double rad = Radians(cnt * turnAngle);
		if (cnt % interval == 0) {
			for (int i = 0; i < sep ; i++) {
				Vec2 vec = Circular(sp, rad + (TwoPi / sep) * i);
				bullets.emplace_back(pos, vec, HSV(hue, 0.7, 1.0));
			}
		}
		for (auto& bullet : bullets) {
			bullet.move();
		}
		Erase_if(bullets, [](Bullet bullet) { return !bullet.isEnabled(); });

		for (auto& bullet : bullets) {
			bullet.draw();
		}
	}
}