refactor: re-organize code

lib/GameManager.cpp

@@ -0,0 +1,65 @@
+#include "GameManager.h";
+
+GameManager::GameManager() {
+	_window.setVerticalSyncEnabled(true);
+}
+
+void GameManager::run() {
+	while (_window.isOpen()) {
+		
+		Event event;
+		while (_window.pollEvent(event)) {
+			if (event.type == Event::Closed) {
+				_window.close();
+			}
+		}
+
+		// Handle user's inputs
+		handleInputs();
+
+		_window.clear(Color::Black);
+
+		// Draw everything
+		_window.draw(_player.getShape());
+
+		for (vector<Laser *>::iterator it = _lasers.begin(); it < _lasers.end();) {
+			_window.draw((*it)->getShape());
+
+			(*it)->getShape().move(0, -5);
+
+			if ((*it)->getShape().getPosition().y < -(*it)->getShape().getScale().y) {
+				it = _lasers.erase(it);
+				continue;
+			}
+
+			++it;
+		}
+
+		_window.display();
+	}
+}
+
+void GameManager::handleInputs() {
+	// Player movements
+	if (Keyboard::isKeyPressed(Keyboard::Left) || Keyboard::isKeyPressed(Keyboard::Q)) {
+		_player.move(-1);
+	}
+
+	if (Keyboard::isKeyPressed(Keyboard::Right) || Keyboard::isKeyPressed(Keyboard::D)) {
+		_player.move(1);
+	}
+
+	if (Keyboard::isKeyPressed(Keyboard::Space)) {
+		if (_clock.getElapsedTime().asMilliseconds() > 500) {
+			const Vector2f playerPos = _player.getShape().getPosition();
+			const float playerRadius = _player.getShape().getRadius();
+
+			Laser* laser = new Laser();
+			laser->setInitialPosition(Vector2f(playerPos.x + playerRadius, playerPos.y - playerRadius));
+
+			_lasers.push_back(laser);
+
+			_clock.restart();
+		}
+	}
+}