feat: add Snake Game in C++

Snake-Game/README.md

@@ -0,0 +1,19 @@
+# Snake Game
+A simple snake game written in C++<br>
+
+## Installation
+Make sure you have C++ installed on your system
+<br>
+```clang++ -O2 -std=c++17 main.cpp -o main.exe```
+<br> or<br>
+```g++ -g main.cpp -o main.exe```
+
+Execute the following to play <br>
+```./main.exe```
+
+## Keybindings
+* ```W``` + ```Enter```  = Up
+* ```A``` + ```Enter```  = Left
+* ```S``` + ```Enter```  = Down
+* ```D``` + ```Enter```  = Down
+* ```Q``` + ```Enter```  = Quit

Snake-Game/main.cpp

@@ -0,0 +1,98 @@
+#include <iostream>
+#include <vector>
+#include <thread>
+#include <atomic>
+#include <algorithm>
+#include <cstdlib>
+
+constexpr int W = 20, H = 10;
+enum Direction { LEFT, RIGHT, TOP, BOTTOM };
+struct Point {
+    int x;
+    int y;
+};
+std::vector<Point> snake; 
+std::atomic<Direction> dir(RIGHT);
+bool game_over = false;
+
+void input_listener() {
+    while(!game_over) {
+        char c;
+        std::cin >> c; 
+        c = tolower(c);
+
+        // prevent 180 deg movement -> snake eating itself lol
+        if(c == 'q') game_over = true; // exit
+        if(c == 'w' && dir != BOTTOM) dir = TOP;
+        if(c == 's' && dir != TOP) dir = BOTTOM;
+        if(c == 'a' && dir != RIGHT) dir = LEFT;
+        if(c == 'd' && dir != LEFT) dir = RIGHT;
+    }
+}
+
+Point generate_fruit() {
+    int fx, fy;
+    do {
+        fx = rand() % W;
+        fy = rand() % H;
+    } while (std::any_of(snake.begin(), snake.end(), [fx, fy](const Point& p) {
+        return p.x == fx && p.y == fy;
+    }));
+
+    Point fruit = {fx, fy};
+    return fruit;
+}
+
+int main() {
+    snake = {{W/2, H/2}, {W/2-1, H/2}, {W/2-2, H/2}};
+
+    std::thread input_thread(input_listener);
+    Point fruit = generate_fruit();
+
+    // game loop
+    while(!game_over) {
+        Point new_head = snake.front();
+        if(dir == TOP) { new_head.y--; }
+        if(dir == BOTTOM) { new_head.y++; }
+        if(dir == RIGHT) { new_head.x++; }
+        if(dir == LEFT) { new_head.x--; }
+
+        // clip through walls
+        if(new_head.x < 0) { new_head.x = W - 1; }
+        if(new_head.x >= W) { new_head.x = 0; }
+        if(new_head.y < 0) { new_head.y = H - 1; }
+        if(new_head.y >= H) { new_head.y = 0; }
+
+        // eating itself
+        for (const auto& s : snake) if (s.x == new_head.x && s.y == new_head.y) game_over = true;
+
+        // create head for moving effect
+        snake.insert(snake.begin(), new_head);
+
+        if (new_head.x == fruit.x && new_head.y == fruit.y) { fruit = generate_fruit(); } 
+        else { snake.pop_back(); }
+
+        system("cls");
+        std::string frame = "";
+
+        // rendering
+        for(int i = 0; i < H; i++) {
+            for(int j = 0; j < W; j++) {
+                if(snake.front().x == j && snake.front().y == i) { frame += "O"; }
+                else if(std::any_of(snake.begin(), snake.end(), [i, j](const Point& p) { return p.x == j && p.y == i; })) { frame += "o"; }
+                else if(fruit.x == j && fruit.y == i) { frame += "X"; }
+                else { frame += "."; }
+            }
+            frame += "\n";
+        }
+        std::cout << frame << std::flush;
+
+        // 10 fps
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    }
+
+    input_thread.join();
+    std::cout << "Game Over!\n";
+
+    return 0;
+}