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

src/engine.cpp

@@ -0,0 +1,125 @@
+#include <engine.hpp>
+#include <iostream>
+#include <chrono>
+#include <thread>
+#include <ranges>
+
+void Window::clear_display() {
+	for(auto &row : view) {
+		row.fill('.');
+	}
+}
+
+void Window::draw_display() {
+	std::cout << "\033[H" << std::flush; // Clear screen
+	for(const auto &row : view) {
+		for(const auto val : row) {
+			if(val == '.') std::cout << ". ";
+			else std::cout << val << " ";
+		}
+		std::cout << "\r\n";
+	}
+}
+
+void Window::update_display(const vec2 &ball, const Paddle &p1, const Paddle &p2) {
+	view[ball.b][ball.a] = '*';
+	for(auto &i : p1.nodes) {
+		view[i.b][i.a] = p1.symbol;
+	}
+	for(auto &i : p2.nodes) {
+		view[i.b][i.a] = p2.symbol;
+	}
+}
+
+Paddle::Paddle(const vec2 init_pos) {
+	for(int i : std::ranges::views::iota(0, (int)nodes.size())) {
+		nodes[i].set(init_pos.a, init_pos.b + i);
+	}
+}
+
+void Paddle::move() {
+	if(dir == Direction::UP && nodes.front().b > 0) {
+		for(auto &i : nodes) { i.b--; }
+	} else if(dir == Direction::DOWN && nodes.back().b < ROW - 1) {
+		for(auto &i : nodes) { i.b++; }
+	}
+	dir = Direction::NONE;
+}
+
+Engine::Engine() {
+	initscr();
+	cbreak();
+	noecho();
+	curs_set(0);
+	nodelay(stdscr, true);
+}
+
+void Engine::on_collision_with_ball() {
+	for(const auto &i : p1.nodes) {
+		if(i == ball) {
+			if (ball_direction.a == 1) ball_direction.a = -1;
+			else ball_direction.a = 1;
+		}
+	}
+	for(const auto &i : p2.nodes) {
+		if(i == ball) {
+			if (ball_direction.a == 1) ball_direction.a = -1;
+			else ball_direction.a = 1;
+		}
+	}
+}
+
+void Engine::run() {
+	while(process_input() && exit_process()) {
+		if(!move_ball()) {
+			if(ball.a < 1) { score.b++; }
+			else if(ball.a > COL - 2) { score.a++; }
+			ball.set(COL / 2, ROW / 2);
+		}
+		p1.move();
+		p2.move();
+		on_collision_with_ball();
+		win.clear_display();
+		win.update_display(ball, p1, p2);
+		win.draw_display();
+		std::cout << "Time left: " << time_seconds << ", Score ( " << score.a << " : " << score.b << " )\n";
+		std::this_thread::sleep_for(std::chrono::milliseconds(150)); // 1000 / fps; 200ms = 5fps
+	}
+}
+
+bool Engine::process_input() {
+	int ch;
+	while((ch = getch()) != ERR) {
+		if(ch == 'q') { return false; }
+		if(ch == 'w') { p1.dir = Direction::UP; }
+		else if(ch == 's') { p1.dir = Direction::DOWN; }
+
+		if(ch == 65) { p2.dir = Direction::UP; }
+		else if(ch == 66) { p2.dir = Direction::DOWN; }
+	}
+	return true;
+}
+
+
+bool Engine::exit_process() {
+	if(time_seconds <= 0) {
+		std::cout << ((score.a > score.b ) ? "Player 1 wins\n" : (score.a == score.b) ? "It's a tie\n" : "Player 2 wins\n");
+		std::this_thread::sleep_for(std::chrono::seconds(1));
+		return false;
+	}
+	return true;
+}
+
+bool Engine::move_ball() {
+	if(ball.b <= 0 || ball.b >= ROW - 1) {
+		if (ball_direction.b == 1) ball_direction.b = -1;
+		else ball_direction.b = 1;
+	}
+	if(ball.a <= 0 || ball.a >= COL - 1) return false;
+	if(ball_direction.a == 1) { ball.a++; }
+	else if(ball_direction.a == -1) { ball.a--; }
+
+	if(ball_direction.b == 1) { ball.b++; }
+	else if(ball_direction.b == -1) { ball.b--; }
+	return true;
+}