refactor: re-organize code

include/GameManager.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cstdlib>
+#include <SFML/Graphics.hpp>
+#include "Player.h"
+#include "Laser.h"
+
+using namespace std;
+using namespace sf;
+
+class GameManager
+{
+public:
+	GameManager();
+
+	void run();
+	void handleInputs();
+
+private:
+	Clock _clock;
+
+	RenderWindow _window{ VideoMode::getFullscreenModes()[0], "Space Invader", Style::Fullscreen };
+
+	Player _player = { _window.getSize() };
+
+	vector<Laser *> _lasers;
+};
+

include/Laser.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <iostream>
+#include <SFML/Graphics.hpp>
+
+using namespace std;
+using namespace sf;
+
+class Laser
+{
+public:
+	Laser();
+
+	RectangleShape& getShape() { return _laser; }
+	
+	void setInitialPosition(Vector2f position);
+
+private:
+	RectangleShape _laser;
+};
+

include/Player.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <SFML/Graphics.hpp>
+#include <iostream>
+
+using namespace std;
+using namespace sf;
+
+class Player
+{
+public:
+	Player(Vector2u screenSize);
+
+	CircleShape getShape() { return _shape; };
+	void move(int direction);
+
+private:
+	CircleShape _shape;
+
+	int _screenWidth;
+};
+