complete rewrite of code as unlike snake and tic_tac_toe, this required bigger changes and more volatile changes all at once

include/engine.hpp

@@ -0,0 +1,59 @@
+#ifndef ENGINE_HPP
+#define ENGINE_HPP
+
+#include <array>
+#include <ncurses.h>
+
+constexpr int ROW = 15;
+constexpr int COL = 31;
+constexpr int SIZE { 5 };
+
+enum class Direction {
+	NONE, UP, DOWN
+};
+
+struct vec2 {
+	int a, b;
+	vec2() : b(0), a(0) {};
+	vec2(int x, int y) : a(x), b(y) {};
+	void set(int a1, int b1) { a = a1; b = b1; };
+	auto operator <=> (const vec2&) const = default;
+};
+
+struct Paddle {
+	Paddle(const vec2 init_pos);
+	std::array<vec2, SIZE> nodes;
+	const char symbol { '|' };
+	enum Direction dir = Direction::NONE;
+	void move();
+};
+
+struct Window {
+	std::array<std::array<char, COL>, ROW> view = {};
+	void clear_display();
+	void draw_display();
+	void update_display(const vec2 &ball, const Paddle &p1, const Paddle &p2);
+};
+
+class Engine {
+public:
+	Engine();
+	~Engine() { endwin(); };
+	void run();
+
+private:
+	Window win;
+	int time_seconds { 30 };
+	vec2 score { 0, 0 };
+	vec2 ball { (COL / 2), (ROW / 2) };
+	vec2 ball_direction { 1, 1 };
+	Paddle p1 { { 1, (ROW / 2) - (SIZE / 2) } };
+	Paddle p2 { { COL - 2, (ROW / 2) - (SIZE / 2) } };
+
+	bool exit_process();
+	bool process_input();
+	bool move_ball();
+	void on_collision_with_ball();
+};
+
+#endif