Literally everything

main.cpp

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+/*
+ * Made by catdotjs 2025, I love rats
+ * This implementation of snake uses a counting clock instead of constraint
+ * based implementation of original snake. It works pretty well at small boards
+ *
+ * Libraries you need:
+ * stdc++ (of course)
+ * ncurses
+ * thats it...
+ */
+#include <algorithm>
+#include <chrono>
+#include <csignal>
+#include <cstdint>
+#include <cstdlib>
+#include <memory>
+#include <ncurses.h>
+#include <string>
+#include <thread>
+#include <vector>
+
+#define SNAKE '#'
+#define APPLE '$'
+#define BASEVAL 4
+#define MULTI 5
+
+struct vec2 {
+  int16_t x, y = 0;
+  vec2(uint16_t x = 0, uint16_t y = 0) : x(x), y(y) {}
+  vec2 &operator+=(vec2 p) {
+    *this = *this + p;
+    return *this;
+  }
+  vec2 &operator-=(vec2 p) {
+    *this = *this - p;
+    return *this;
+  }
+  vec2 &operator*=(int p) {
+    *this = *this * p;
+    return *this;
+  }
+  vec2 &operator/=(int p) {
+    *this = *this / p;
+    return *this;
+  }
+  vec2 operator+(const vec2 &q) { return vec2(x + q.x, y + q.y); }
+  vec2 operator-(const vec2 &q) { return vec2(x - q.x, y - q.y); }
+  vec2 operator*(const uint16_t &q) { return vec2(x * q, y * q); }
+  vec2 operator/(const uint16_t &q) { return vec2(x / q, y / q); }
+};
+
+class Game {
+public:
+  Game(uint16_t boardX = 40, uint16_t boardY = 60, uint16_t framesPerSec = 20)
+      : delay(1000 / framesPerSec), boardSize(boardX, boardY),
+        snakeHead(boardX / 2, boardY / 2), GameBoard(boardX * boardY, 0),
+        snakeDir(0, -1) {
+    initscr();
+
+    // Accept keypad key presses KEY_UP, KEY_DOWN, KEY_RIGHT, KEY_LEFT and do
+    // not block for input
+    noecho();
+    cbreak();
+    nodelay(stdscr, true);
+    keypad(stdscr, true);
+    srand(time(0));
+
+    GameBoard[posOnArray(snakeHead)] = snakeLen;
+  };
+  ~Game() { endwin(); };
+
+  void start() {
+    drawBorder();
+    placeApple();
+    while (isRunning) {
+      input();
+      checkFail();
+      draw();
+      refresh();
+      std::this_thread::sleep_for(delay);
+    }
+  }
+  void end() { isRunning = false; }
+
+private:
+  uint16_t posOnArray(vec2 obj) { return obj.x + (obj.y * boardSize.x); }
+
+  void drawBorder() {
+    std::string width(boardSize.x, '-');
+    mvprintw(boardSize.y, 0, width.c_str());
+    for (uint16_t i = 0; i < boardSize.y; i++) {
+      mvaddch(i, boardSize.x, '|');
+    }
+  }
+
+  void input() {
+    int key = getch();
+    switch (key) {
+    case KEY_UP:
+      if (snakeDir.y != 1) {
+        snakeDir.y = -1;
+        snakeDir.x = 0;
+      }
+      break;
+    case KEY_DOWN:
+      if (snakeDir.y != -1) {
+        snakeDir.y = 1;
+        snakeDir.x = 0;
+      }
+      break;
+    case KEY_LEFT:
+      if (snakeDir.x != 1) {
+        snakeDir.y = 0;
+        snakeDir.x = -1;
+      }
+      break;
+    case KEY_RIGHT:
+      if (snakeDir.x != -1) {
+        snakeDir.y = 0;
+        snakeDir.x = 1;
+      }
+      break;
+    default:
+      break;
+    }
+    snakeHead += snakeDir;
+  }
+
+  void checkFail() {
+    bool xOverflow = snakeHead.x < 0 || snakeHead.x >= boardSize.x;
+    bool yOverflow = snakeHead.y < 0 || snakeHead.y >= boardSize.y;
+    if (xOverflow || yOverflow || GameBoard[posOnArray(snakeHead)] != 0) {
+      end();
+      gameOver();
+      return;
+    }
+    GameBoard[posOnArray(snakeHead)] = snakeLen;
+  }
+
+  void gameOver() {
+    vec2 scr = boardSize / 2;
+    std::string gameover = "Game Over! Exiting in 5 seconds!";
+    uint16_t x = std::max((int)(scr.x - (gameover.length() / 2)), 0);
+    mvprintw(scr.y - 1, x, gameover.c_str());
+    mvprintw(scr.y, x, "Your score: %d", (snakeLen - BASEVAL) * MULTI);
+    refresh();
+
+    std::this_thread::sleep_for(std::chrono::seconds(5));
+  }
+
+  void placeApple() {
+    do {
+      apple.x = rand() % boardSize.x;
+      apple.y = rand() % boardSize.y;
+    } while (GameBoard[posOnArray(apple)] != 0);
+  }
+
+  void draw() {
+    for (uint16_t i = 0; i < boardSize.x * boardSize.y; i++) {
+      uint16_t x = i % boardSize.x;
+      uint16_t y = i / boardSize.x;
+      if (x != apple.x || y != apple.y) {
+        uint16_t val = GameBoard[i];
+        mvaddch(y, x, val > 0 ? SNAKE : ' ');
+
+        // Tick down the snake
+        if (val > 0) {
+          GameBoard[i]--;
+        }
+      } else {
+        mvaddch(y, x, APPLE);
+      }
+    }
+
+    if (apple.x == snakeHead.x && apple.y == snakeHead.y) {
+      snakeLen++;
+      placeApple();
+    }
+  }
+
+  vec2 snakeHead, boardSize, apple, snakeDir;
+  uint16_t snakeLen = BASEVAL;
+  bool isRunning = true;
+
+  std::vector<uint16_t> GameBoard;
+  std::chrono::milliseconds delay;
+};
+std::unique_ptr<Game> game;
+
+void handleSignal(int signal) { game->end(); }
+
+int main(int argc, char *argv[]) {
+  game = std::make_unique<Game>(90, 30, 10);
+  std::signal(SIGTERM, handleSignal);
+  std::signal(SIGINT, handleSignal);
+  game->start();
+  return 0;
+}